LTC2856-58(-1,-2) Datasheet by Analog Devices Inc.

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NOW PM W LTC2856—1 / LTC2856—2 ANALOG LTC2857—1/LTC2857—2 DEVICES LTC2858—1 / LTC2858—2 LIL TIEIDHNOLOGY
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
1
285678fg
For more information www.linear.com/LTC2856-1
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
20Mbps and Slew Rate Limited
15kV RS485/RS422 Transceivers
The LT C
®
2856-1, LTC2856-2, LTC2857-1, LTC2857-2,
LTC2858-1 and LTC2858-2 are low power, RS485/RS422
transceivers operating on 5V supplies at maximum data
rates of 20Mbps or 250kbps for low EMI. The receiver has
a one-eighth unit load, supporting up to 256 nodes per bus
(C, I-Grade), and a failsafe feature that guarantees a high
output state under conditions of floating or shorted inputs.
The driver maintains a high output impedance over the
entire common mode range when disabled or when the
supply is removed. Excessive power dissipation caused
by bus contention or a fault is prevented by current limit-
ing all outputs and by thermal shutdown.
Enhanced ESD protection allows these parts to withstand
±15kV (human body model) on the transceiver interface
pins without latchup or damage.
n 20Mbps or Low EMI 250kbps Maximum Data Rate
n No Damage or Latchup to ESD: ±15kV HBM
n High Input Impedance Supports 256 Nodes
(C, I-Grade)
n Operation Up to 125°C (H-Grade)
n Guaranteed Failsafe Receiver Operation Over the
Entire Common Mode Range
n Current Limited Drivers and Thermal Shutdown
n Delayed Micropower Shutdown: 5µA Maximum
(C, I-Grade)
n Power Up/Down Glitch-Free Driver Outputs
n Low Operating Current: 900µA Maximum in Receive
Mode
n Compatible with TIA/EIA-485-A Specifications
n Available in 8-Lead and 10-Lead 3mm × 3mm DFN
and 8-Lead and 10-Lead MSOP Packages
n Low Power RS485/RS422 Transceiver
n Level Translator
n Backplane Transceiver
VCC1
GND1
R
RO1
RE1
DE1
DI1 D
RT
LTC2856-1
LTC2856-1
RT
285678 TA01a
VCC2
GND2
R
RO2
RE2
DE2
DI2 D
PART
NUMBER
MAX DATA
RATE (Mbps)
DUPLEX
PACKAGE
LTC2856-1 20 Half MSOP-8, DFN-8
LTC2856-2 0.25 Half MSOP-8, DFN-8
LTC2857-1 20 Full MSOP-8, DFN-8
LTC2857-2 0.25 Full MSOP-8, DFN-8
LTC2858-1 20 Full MSOP-10, DFN-10
LTC2858-2 0.25 Full MSOP-10, DFN-10
DI
Y
Z
Y-Z
20ns/DIV 2856 TA01b
2V/DIV
LTC2858-1 at 20Mbps
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
AnalogDevices, Inc. All other trademarks are the property of their respective owners.
(RE 3:]: [:E: 3:33 :EE: 3222: CECE: flfiibfli
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
2
285678fg
For more information www.linear.com/LTC2856-1
PACKAGE INFORMATION
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ................................... 0.3V to 7V
Logic Input Voltages (RE, DE, DI) ................ 0.3V to 7V
Interface I/O (A, B, Y, Z) ....................(VCC15V) to 15V
Receiver Output Voltage (RO) .......0.3V to (VCC + 0.3V)
Operating Temperature Range (Note 4)
LTC285xC ................................................ 0°C to 70°C
LTC285xI .............................................40°C to 85°C
LTC285xH .......................................... 40°C to 125°C
(Note 1)
Storage Temperature Range
MSOP ................................................ 65°C to 150°C
DFN .................................................... 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
LTC2856
TOP VIEW
9
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1RO
RE
DE
DI
VCC
B
A
GND
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TJMAX = 150°C, θJA = 43°C/W, θJC = 5.5°C/W
1
2
3
4
RO
RE
DE
DI
8
7
6
5
VCC
B
A
GND
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 163°C/W, θJC = 40°C/W
LTC2857
TOP VIEW
9
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1VCC
RO
DI
GND
A
B
Z
Y
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TJMAX = 150°C, θJA = 43°C/W, θJC = 5.5°C/W
1
2
3
4
VCC
RO
DI
GND
8
7
6
5
A
B
Z
Y
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 163°C/W, θJC = 40°C/W
LTC2858
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1VCC
A
B
Z
Y
RO
RE
DE
DI
GND
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
TJMAX = 150°C, θJA = 43°C/W, θJC = 5.5°C/W
1
2
3
4
5
RO
RE
DE
DI
GND
10
9
8
7
6
VCC
A
B
Z
Y
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 160°C/W, θJC = 45°C/W
; E
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
3
285678fg
For more information www.linear.com/LTC2856-1
http://www.linear.com/product/LTC2856-1#orderinfo
LTC2856 C DD -1 #TR PBF
LEAD FREE DESIGNATOR
TAPE AND REEL
TR = Tape and Reel
SPEED
–1 = 20Mbps Max. Data Rate
–2 = 250kbps Max. Data Rate
PACKAGE TYPE
DD = 8-Lead Plastic DFN (LTC2856, LTC2858)
MS8 = 8-Lead Plastic MSOP (LTC2856, LTC2857)
MS = 10-Lead Plastic MSOP (LTC2858)
TEMPERATURE GRADE
C = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (–40°C to 85°C)
H = Automotive Temperature Range (–40°C to 125°C)
PRODUCT PART NUMBER
LTC2856 = Half Duplex, with Enables
LTC2857 = Full Duplex, no Enables
LTC2858 = Full Duplex, with Enables
ORDER INFORMATION
PRODUCT SELECTION GUIDE
PART NUMBER PART MARKING MAX DATA RATE (Mbps) DUPLEX
LOW POWER
SHUTDOWN MODE PACKAGE
LTC2856-1 LTCMF, LCMG 20 Half Yes MSOP-8, DFN-8
LTC2856-2 LTCMH, LCMJ 0.25 Half Yes MSOP-8, DFN-8
LTC2857-1 LTCMC, LCMD 20 Full No MSOP-8, DFN-8
LTC2857-2 LTCMK, LCMM 0.25 Full No MSOP-8, DFN-8
LTC2858-1 LTCGQ, LCGR 20 Full Yes MSOP-10, DFN-10
LTC2858-2 LTCMQ, LCMR 0.25 Full Yes MSOP-10, DFN-10
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
4
285678fg
For more information www.linear.com/LTC2856-1
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Driver
|VOD| Differential Driver Output Voltage R = ∞, VCC = 4.5V (Figure 1) lVCC V
R = 27Ω (RS485), VCC = 4.5V (Figure 1) l1.5 VCC V
R = 50Ω (RS422), VCC = 4.5V (Figure 1) l2 VCC V
Δ|VOD| Change in Magnitude of Driver Differential
Output Voltage for Complementary Output
States
R = 27Ω or R = 50Ω (Figure 1) l0.2 V
VOC Driver Common Mode Output Voltage R = 27Ω or R = 50Ω (Figure 1) l3 V
Δ|VOC| Change in Magnitude of Driver Common Mode
Output Voltage for Complementary Output
States
R = 27Ω or R = 50Ω (Figure 1) l0.2 V
IOZD Driver Three-State (High Impedance) Output
Current on Y and Z
DE = 0V, (Y or Z) = –7V, 12V, LTC2858-1,
LTC2858-2
H-Grade
l
l
±10
±50
µA
µA
IOSD Maximum Driver Short-Circuit Current –7V ≤ (Y or Z) ≤ 12V (Figure 2) l±120 ±250 mA
Receiver
IIN Receiver Input Current (A, B) DE = TE = 0V, VCC = 0V or 5V, VIN = 12V
(Figure 3) (C, I-Grade)
DE = TE = 0V, VCC = 0V or 5V, VIN = –7V,
(Figure 3) (C, I-Grade)
l
l
–100
125 µA
µA
DE = TE = 0V, VCC = 0V or 5V, VIN = 12V
(Figure 3) (H-Grade)
DE = TE = 0V, VCC = 0V or 5V, VIN = –7V,
(Figure 3) (H-Grade)
l
l
–145
250 µA
µA
RIN Receiver Input Resistance RE = VCC or 0V, DE = TE = 0V,
VIN = –7V, –3V, 3V, 7V, 12V (Figure 3)
(C, I-Grade)
l96 125 kΩ
RE = VCC or 0V, DE = TE = 0V,
VIN = –7V, –3V, 3V, 7V, 12V (Figure 3)
(H-Grade)
l48 125 kΩ
VTH Receiver Differential Input Threshold Voltage –7V ≤ B ≤ 12V l±0.2 V
ΔVTH Receiver Input Hysteresis B = 0V 25 mV
VOH Receiver Output High Voltage I(RO) = –4mA, A-B = 200mV, VCC = 4.5V l2.4 V
VOL Receiver Output Low Voltage I(RO) = 4mA, A-B = –200mV, VCC = 4.5V l0.4 V
IOZR Receiver Three-State (High Impedance) Output
Current on RO
RE = 5V, 0V ≤ RO ≤ VCC, LTC2856-1,
LTC2856-2, LTC2858-1, LTC2858-2
l±1 µA
Logic
VIH Logic Input High Voltage DE, DI, RE, VCC = 5.5V l2 V
VIL Logic Input Low Voltage DE, DI, RE, VCC = 4.5V l0.8 V
IINL Logic Input Current DE, DI, RE l0 ±10 µA
Supplies
ICCS Supply Current in Shutdown Mode DE = 0V, RE = VCC,
LTC2856, LTC2858 (C and I-Grade)
LTC2856, LTC2858 (H-Grade)
l
l
0
0
5
15
µA
µA
ICCR Supply Current in Receive Mode No Load, DE = 0V, RE = 0V, LTC2856-1,
LTC2856-2, LTC2858-1, LTC2858-2
l540 900 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V unless otherwise noted. (Note 2)
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
5
285678fg
For more information www.linear.com/LTC2856-1
SWITCHING CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ICCT Supply Current in Transmit Mode No Load, DE = VCC,
RE = VCC
LTC2856-1
LTC2858-1
l630 1000 µA
LTC2856-2
LTC2858-2
l670 1100 µA
ICCTR Supply Current with Both Driver and Receiver
Enabled
No Load, DE = VCC,
RE = 0V
LTC2856-1
LTC2857-1
LTC2858-1
l660 1100 µA
LTC2856-2
LTC2857-2
LTC2858-2
l700 1200 µA
Driver in LTC2856-1, LTC2857-1, LTC2858-1
fMAX Maximum Data Rate (Note 3) l20 Mbps
tPLHD, tPHLD Driver Input to Output RDIFF = 54Ω, CL = 100pF (Figure 4) l10 50 ns
ΔtPD Driver Input to Output Difference |tPLHD – tPHLD| RDIFF = 54Ω, CL = 100pF (Figure 4) l1 6 ns
tSKEWD Driver Output Y to Output Z RDIFF = 54Ω, CL = 100pF (Figure 4) l1 ±6 ns
tRD, tFD Driver Rise or Fall Time RDIFF = 54Ω, CL = 100pF (Figure 4) l4 12.5 ns
tZLD, tZHD,
tLZD, tHZD
Driver Enable or Disable Time RL = 500Ω, CL = 50pF, RE = 0V,
LTC2856-1, LTC2858-1 (Figure 5)
l70 ns
tZHSD, tZLSD Driver Enable from Shutdown RL = 500Ω, CL = 50pF, RE = VCC,
LTC2856-1, LTC2858-1 (Figure 5)
l8 µs
tSHDN Time to Shutdown (DE = , RE = VCC) or (DE = 0V, RE = ),
LTC2856-1, LTC2858-1 (Figure 5)
l100 ns
Driver in LTC2856-2, LTC2857-2, LTC2858-2
fMAXS Maximum Data Rate (Note 3) l250 kbps
tPLHDS, tPHLDS Driver Input to Output RDIFF = 54Ω, CL = 100pF (Figure 4) l0.95 1.5 µs
ΔtPDS Driver Input to Output Difference |tPLHD – tPHLD| RDIFF = 54Ω, CL = 100pF (Figure 4) l50 500 ns
tSKEWDS Driver Output A to Output B RDIFF = 54Ω, CL = 100pF (Figure 4) l200 ±500 ns
tRDS, tFDS Driver Rise or Fall Time RDIFF = 54Ω, CL = 100pF (Figure 4) l0.90 1.5 µs
tZHDS, tZLDS Driver Enable Time RL = 500Ω, CL = 50pF, RE = 0V,
LTC2856-2, LTC2858-2 (Figure 5)
l300 ns
tLZDS, tHZDS Driver Disable Time RL = 500Ω, CL = 50pF, RE = 0V,
LTC2856-2, LTC2858-2 (Figure 5)
l70 ns
tZHSDS, tZLSDS Driver Enable from Shutdown RL = 500Ω, CL 50pF, RE = VCC,
LTC2856-2, LTC2858-2 (Figure 5)
l8 µs
tSHDNS Time to Shutdown (DE = 0V, RE) or (DE = , RE = VCC),
LTC2856-2, LTC2858-2 (Figure 5)
l500 ns
Receiver
tPLHR, tPHLR Receiver Input to Output CL = 15pF, VCM = 1.5V, |VAB| = 1.5V,
tR and tF < 4ns (Figure 6)
l50 70 ns
tSKEWR Differential Receiver Skew, |tPLHR – tPHLR| CL = 15pF (Figure 6) l1 6 ns
tRR, tFR Receiver Output Rise or Fall Time CL = 15pF (Figure 6) l3 12.5 ns
tZLR, tZHR,
tLZR, tHZR
Receiver Enable/Disable RL = 1k, CL = 15pF, DE = VCC,
LTC2856-1, LTC2856-2, LTC2858-1,
LTC2858-2 (Figure 7)
l50 ns
tZHSR, tZLSR Receiver Enable from Shutdown RL = 1k, CL = 15pF, DE = 0V,
LTC2856-1, LTC2856-2, LTC2858-1,
LTC2858-2 (Figure 7)
l8 µs
@
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
6
285678fg
For more information www.linear.com/LTC2856-1
TEST CIRCUITS
+
DRIVER
DI
GND
OR
VCC
R
285678 F01
Y
Z
R
VOC
+
VOD
Figure 1. Driver DC Characteristics Figure 2. Driver Output Short-Circuit Current
DRIVER
DI
GND
OR
VCC
285678 F02
Y
Z
+
IOSD
–7V TO +12V
+
RECEIVER
285678 F03
A OR B
VIN
IN
B OR A
VIN
IIN
RIN =
Figure 3. Receiver Input Current and Input Resistance
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime. High temperatures degrade operating lifetimes.
Operating lifetime is derated at temperatures greater than 105°C.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3: Maximum data rate is guaranteed by other measured parameters
and is not tested directly.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions.
Overtemperature protection actives at a junction temperature exceeding
150°C. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
ELECTRICAL CHARACTERISTICS
J M M] im‘
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
7
285678fg
For more information www.linear.com/LTC2856-1
TEST CIRCUITS
DRIVER
DI RDIFF
CL
CL
285678 F04a
Y
Z
tPLHD,
tPLHDS
1/2 VO
90% 90%
0 0
tRD,
tRDS
tFD,
tFDS
10%
285678 F04b
10%
VO
V
CC
Y, Z
DI
Y-Z
0V tSKEWD,tSKEWDS
tPHLD,
tPHLDS
Figure 4. Driver Timing Measurement
Figure 5. Driver Enable and Disable Timing Measurement
DRIVER
DI
VCC
OR
GND
GND
OR
VCC
VCC
OR
GND
RL
RL
CL
285678 F05a
Y
Z
DE
CL
tZLD,
tZLDS,
tZLSD,
tZLSDS
tZHD,
tZHDS,
tZHSD,
tZHSDS
tHZD,
tHZDS,
tSHDN,
tSHDNS
tLZD,
tLZDS
1/2 VCC
1/2 VCC
1/2 VCC
DE
Y OR Z
Z OR Y
V
CC
VCC
VOL
VO
VOH
0V
0V
0.5V
0.5V
285678 F05b
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
8
285678fg
For more information www.linear.com/LTC2856-1
A
B
VCM
±VAB/2
±VAB/2
RO
CL
285678 F06a
RECEIVER
tPLHR tPHLR
90%
0
tSKEWR = tPLHR – tPHLR
90%
1/2 VCC 1/2 VCC
tRR tFR
10%
285678 F06b
10%
VAB
VCC
VO
0
–VAB
RO
A-B
Figure 6. Receiver Propagation Delay Measurements
A
B
0V OR VCC
VCC OR 0V
RO
RE
CL
DI = 0V OR VCC
RLVCC
OR
GND
285678 F07a
RECEIVER
tZLR,
tZLSR
tZHR,
tZHSR tHZR
tLZR
1/2 VCC
1/2 VCC
1/2 VCC
RE
RO
RO
VCC
VCC
VOL
VO
VOH
0V
0V
0.5V
0.5V
285678 F05b
Figure 7. Receiver Enable/Disable Time Measurements
FUNCTION TABLES
LTC2856-1, LTC2856-2
LOGIC INPUTS
MODE A, B RO
DE RE
0 0 Receive RIN Driven
0 1 Shutdown RIN High-Z
1 0 Transceive Driven Driven
1 1 Transmit Driven High-Z
LTC2858-1, LTC2858-2
LOGIC INPUTS
MODE A, B Y, Z RO
DE RE
0 0 Receive RIN High-Z Driven
0 1 Shutdown RIN High-Z High-Z
1 0 Transceive RIN Driven Driven
1 1 Transmit RIN Driven High-Z
TEST CIRCUITS
\ \\ \ / \ \ I VDH “’r" \\\\\ \ \\\ \ \\ \\ ~\ vUL scum MH \ \ 0m) SWK -————-—--—— _. HP-‘V"
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
9
285678fg
For more information www.linear.com/LTC2856-1
TYPICAL PERFORMANCE CHARACTERISTICS
Receiver Skew vs Temperature Driver Skew vs Temperature
Driver Propagation Delay
vs Temperature
Driver Output Short-Circuit
Current vs Temperature
Driver Output Low/High Voltage
vs Output Current
Driver Differential Output Voltage
vs Temperature
Receiver Output Voltage vs
Output Current (Source and Sink)
Receiver Propagation Delay
vs Temperature Supply Current vs Data Rate
TEMPERATURE (°C)
–40
–1
RECEIVER SKEW (ns)
0
1
2
–20 0 20 40
385678 G01
60 80 100
120
VAB = 1.5V
CL = 15pF
TEMPERATURE (°C)
–40
–1
DRIVER SKEW (ns)
0
1
2
–20 0 20 40
385678 G02
60 80 100
120
RDIFF = 54Ω
CL = 100pF
TEMPERATURE (°C)
–40
DRIVER PROP DELAY (ns)
12
14
16
80
285678 G03
10
8
0 40
–20 100
20 60 120
6
4
18 RDIFF = 54Ω
CL = 100pF
TEMPERATURE (°C)
–40
80
OUTPUT SHORT-CIRCUIT CURRENT (mA)
100
120
140
160
–20 0 20 40
285678 G04
60 80 100 120
SOURCE
(VOUT = 0V)
SINK
(VOUT = 5V)
OUTPUT CURRENT (mA)
0 10
0
OUTPUT VOLTAGE (V)
2
5
VOH
VOL
20 40 50
285678 G05
1
4
3
30 60
70
TEMPERATURE (°C)
–40
OUTPUT VOLTAGE (V)
3
4
5
20 60 120
285678 G06
2
1
0
–20 0 40 80 100
RDIFF = ∞
RDIFF = 100Ω
RDIFF = 54Ω
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
3
4
5
4
285678 G07
2
1
0123
SINK
SOURCE
5
TEMPERATURE (°C)
–40
PROP DELAY (ns)
50
60
120
285678 G08
40
30 040 80
–20 20 60 100
70
45
55
35
65
VAB = 1.5V
CL = 15pF
DATA RATE (Mbps)
0.1
0
SUPPLY CURRENT (mA)
40
50
60
1 10
100
285678 G09
30
20
10
CL = 100pF
RDIFF = ∞
RDIFF = 100Ω
RDIFF = 54Ω
TA = 25°C, VCC = 5V unless otherwise noted.
‘IO
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
10
285678fg
For more information www.linear.com/LTC2856-1
PIN FUNCTIONS
PIN NAME
PIN NUMBER
DESCRIPTION
LTC2856-1
LTC2856-2
LTC2857-1
LTC2857-2
LTC2858-1
LTC2858-2
RO 1 2 1 Receiver Output. If the receiver output is enabled (RE low) and A > B by 200mV,
then RO will be high. If A < B by 200mV, then RO will be low. If the receiver
inputs are open, shorted or terminated without a valid signal, RO will be high.
RE 2 2 Receiver Enable. A low enables the receiver. A high input forces the receiver
output into a high impedance state.
DE 3 3 Driver Enable. A high on DE enables the driver. A low input will force the driver
outputs into a high impedance. If RE is high with DE low, the part will enter a
low power shutdown state.
DI 4 3 4 Driver Input. If the driver outputs are enabled (DE high), then a low on DI forces
the driver positive output low and negative output high. A high on DI, with
the driver outputs enabled, forces the driver positive output high and negative
output low.
GND 5/9* 4/9* 5/11* Ground. *The Exposed Pad on the DFN packages should be connected to
ground.
Y 5 6 Noninverting Driver Output for the LTC2857-1, LTC2857-2, LTC2858-1 and
LTC2858-2. High impedance when the driver is disabled (LTC2858-1) or
unpowered.
Z 6 7 Inverting Driver Output for the LTC2857-1, LTC2857-2, LTC2858-1 and
LTC2858-2. High impedance when the driver is disabled (LTC2858-1) or
unpowered.
B 7 7 8 Inverting Receiver Input (and Inverting Driver Output for the LTC2856-1 and
LTC2856-2). Impedance is > 96kΩ in receive mode or unpowered.
A 6 8 9 Noninverting Receiver Input (and Noninverting Driver Output for the LTC2856-1
and LTC2856-2). Impedance is > 96kΩ in receive mode or unpowered.
VCC 8 1 10 Positive Supply. 4.5V < VCC < 5.5V. Bypass with a 0.1µF ceramic capacitor.
‘I‘I
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
11
285678fg
For more information www.linear.com/LTC2856-1
BLOCK DIAGRAMS
SLEEP/SHUTDOWN
LOGIC AND DELAY
RECEIVER
DRIVER
RO
RE
DE
DI
A
(15kV)
B
(15kV)
2856 BD
LTC2856-1, LTC2856-2
RECEIVER
DRIVER
RO
DI
2857 BD
A
(15kV)
Z
(15kV)
Y
(15kV)
B
(15kV)
LTC2857-1, LTC2857-2
LTC2858-1, LTC2858-2
SLEEP/SHUTDOWN
LOGIC AND DELAY
RECEIVER
DRIVER
RO
RE
DE
DI
2858 BD
A
(15kV)
Z
(15kV)
Y
(15kV)
B
(15kV)
12
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
12
285678fg
For more information www.linear.com/LTC2856-1
APPLICATIONS INFORMATION
Driver
The driver provides full RS485 and RS422 compatibil-
ity. When enabled, if DI is high, Y-Z is positive for the
full-duplex devices and A-B is positive for the half-duplex
device.
When the driver is disabled, both outputs are high imped-
ance. For the full-duplex devices, the leakage on the driver
output pins is guaranteed to be less than 10µA over the
entire common mode range of –7V to 12V. On the half-
duplex device, the impedance is dominated by the receiver
input resistance, RIN.
Driver Overvoltage and Overcurrent Protection
The driver outputs are protected from short circuits
to any voltage within the Absolute Maximum range of
(VCC – 15V) to 15V. The maximum current in this condi-
tion is 250mA. If the pin voltage exceeds about ±10V,
current limit folds back to about half of the peak value
to reduce overall power dissipation and avoid damaging
the part.
All devices also feature thermal shutdown protection that
disables the driver and receiver output in case of exces-
sive power dissipation (see Note 4).
Slew Limiting for EMI Emissions Control
The LTC2856-2, LTC2857-2 and the LTC2858-2 feature
reduced slew rate driver outputs to control the high fre-
quency EMI emissions from equipment and data cables.
These devices are limited to data rates of 250kbaud or
less. Slew limiting also mitigates the adverse affects of
imperfect transmission line termination caused by stubs
or mismatched cable.
Figures 10 and 11 show the output waveforms from the
LTC2858-1 and its slew rate limited counterpart, the
LTC2858-2, operating at 250kbps. The corresponding
frequency spectrums show significant reduction in the
high frequency harmonics for the slew rate limited device.
Receiver and Failsafe
With the receiver enabled, when the absolute value of the
differential voltage between the A and B pins is greater
than 200mV, the state of RO will reflect the polarity of
(A-B).
These parts have a failsafe feature that guarantees the
receiver output to be in a logic-high state when the inputs
are either shorted, left open or terminated, but not driven
for more than about 3µs. The delay prevents signal zero
crossings from being interpreted as shorted inputs and
causing RO to go high inadvertently. This failsafe feature
is guaranteed to work for inputs spanning the entire com-
mon mode range of –7V to 12V.
The receiver output is internally driven high (to VCC) or
low (to ground) with no external pull-up needed. When
the receiver is disabled the RO pin becomes high-Z with
leakage of less than ±1µA for voltages within the supply
range.
Receiver Input Resistance
The receiver input resistance from A or B to ground is
guaranteed to be greater than 96k (C, I-Grade). This is 8×
higher than the requirements for the RS485 standard and
thus this receiver represents a one-eighth unit load. This,
in turn, means that 8× the standard number of receivers,
or 256 total, can be connected to a line without loading
it beyond what is called out in the RS485 standard. The
receiver input resistance from A or B to ground on high
temperature H-Grade parts is greater than 48k providing
a one-quarter unit load. The input resistance of the receiv-
ers is unaffected by enabling/disabling the receiver and
by powering/unpowering the part.
Supply Current
The unloaded static supply currents in these devices are
very low—typically under 700µA for all modes of opera-
tion. In applications with resistively terminated cables,
the supply current is dominated by the driver load. For
example, when using two 120Ω terminators with a dif-
ferential driver output voltage of 2V, the DC load current
is 33mA, which is sourced by the positive voltage supply.
Power supply current increases with toggling data due to
capacitive loading and this term can increase significantly
at high data rates. Figure 8 shows supply current vs data
rate for two different capacitive loads for the circuit con-
figuration of Figure 4.
‘7 Loerw M0 MAX DATA R 13
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
13
285678fg
For more information www.linear.com/LTC2856-1
APPLICATIONS INFORMATION
High Speed Considerations
A ground plane layout is recommended. A 0.1µF bypass
capacitor less than one-quarter inch away from the VCC
pin is also recommended. The PC board traces connected
to signals A/B and Z/Y should be symmetrical and as short
as possible to maintain good differential signal integrity.
To minimize capacitive effects, the differential signals
should be separated by more than the width of a trace
and should not be routed on top of each other if they are
on different signal planes.
Care should be taken to route outputs away from any sen
-
sitive inputs to reduce feedback effects that might cause
noise, jitter or even oscillations. For example, in the full-
duplex LTC2857-1, DI and A/B should not be routed near
the driver or receiver outputs.
The logic inputs have 100mV of hysteresis to provide
noise immunity. Fast edges on the outputs can cause
glitches in the ground and power supplies which are
exacerbated by capacitive loading. If a logic input is held
near its threshold (typically 1.5V), a noise glitch from a
driver transition may exceed the hysteresis levels on the
logic and data input pins causing an unintended state
change. This can be avoided by maintaining normal logic
levels on the pins and by slewing inputs through their
thresholds by faster than 1V/µs when transitioning. Good
supply decoupling and proper line termination also reduce
glitches caused by driver transitions.
Cable Length vs Data Rate
For a given data rate, the maximum transmission dis-
tance is bounded by the cable properties. A typical curve
of cable length vs data rate compliant with the RS485
standard is shown in Figure 9. Three regions of this curve
reflect different performance limiting factors in data trans-
mission. In the flat region of the curve, maximum distance
is determined by resistive losses in the cable. The down-
ward sloping region represents limits in distance and data
rate due to AC losses in the cable. The solid vertical line
represents the specified maximum data rate in the RS485
standard. The dashed line at 250kbps shows the maxi-
mum data rate of the low-EMI LTC2856-2, LTC2857-2,
and LTC2858-2. The dashed line at 20Mbps shows the
maximum data rates of the LTC2856-1, LTC2857-1 and
LTC2858-1.
Figure 8. Supply Current vs Data Rate
Cable Termination
Proper cable termination is very important for good signal
fidelity. If the cable is not terminated with its characteristic
impedance, reflections will result in distorted waveforms.
RS485 transceivers typically communicate over twisted-
pair cables with characteristic impedance ranging from
100Ω to 120Ω. Each end of the network should be termi-
nated with a discrete resistor matching the characteristic
impedance or with an LTC2859/LTC2861 transceiver with
integrated termination capability.
Figure 9. Cable Length vs Data Rate
(RS485 Standard Shown in Solid Vertical Lines)
DATA RATE (kbps)
102
45
CURRENT (mA)
65
70
75
103104105
285678 F08
60
55
50
RDIFF = 54Ω
CL = 1000pF
CL = 100pF
285678 F09
DATA RATE (bps)
CABLE LENGTH (FT)
10k 1M 10M100k 100M
100
1k
10
10k
LOW-EMI MODE
MAX DATA RATE
RS485 MAX
DATA RATE
NORMAL
MODE MAX
DATA RATE
14 W W} W S
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
14
285678fg
For more information www.linear.com/LTC2856-1
Failsafe “0” Application (Idle State = Logic “0”)
TYPICAL APPLICATIONS
D
VCC
I1
I2
100k
B
A
“A”
“B”
RO
DI
LTC2856-1 285678 TA02
R
APPLICATIONS INFORMATION
Time-Based Traces Frequency Spectrum
Figure 10. LTC2858-1 Driver Output at 100kHz Into 100Ω Resistor
Figure 11. LTC2858-2 Driver Output at 100kHz Into 100Ω Resistor
2µs/DIV
Y, Z
1V/DIV
Y-Z
2V/DIV
285678 F10a 1.25MHz/DIV
Y-Z
10dB/DIV
285678 F10b
2µs/DIV
Y-Z
2V/DIV
Y, Z
1V/DIV
285678 F11a 1.2MHz/DIV
Y-Z
10dB/DIV
285678 F11b
DD Package l \‘O 1 J l, D L F L NOTE \ DRAWWG TU BE MADEA 2 DPAWWG NOT TU SCALE 3 ALL DLMENSLONS ARE w MLLLLMETERS A DLMENSLONS 0E EXPOSED PAD 0N BUT MOLD FLASH MOLD FLASH. \F PRESEN 5 EXPOSED PAD SHALL BE SOLDER PLA 6 SHADED AREA ‘8 mm A REFERENCE ON TOP AND BOTTOM OF PACKAGE 15
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
15
285678fg
For more information www.linear.com/LTC2856-1
PACKAGE DESCRIPTION
3.00 ±0.10
(4 SIDES)
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
0.40 ±0.10
BOTTOM VIEW—EXPOSED PAD
1.65 ±0.10
(2 SIDES)
0.75 ±0.05
R = 0.125
TYP
2.38 ±0.10
14
85
PIN 1
TOP MARK
(NOTE 6)
0.200 REF
0.00 – 0.05
(DD8) DFN 0509 REV C
0.25 ±0.05
2.38 ±0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
1.65 ±0.05
(2 SIDES)2.10 ±0.05
0.50
BSC
0.70 ±0.05
3.5
±0.05
PACKAGE
OUTLINE
0.25 ±0.05
0.50 BSC
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
Please refer to http://www.linear.com/product/LTC2856-1#packaging for the most recent package drawings.
16 mm -MN ‘2 DD Package
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
16
285678fg
For more information www.linear.com/LTC2856-1
PACKAGE DESCRIPTION
3.00 ±0.10
(4 SIDES)
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
0.40 ±0.10
BOTTOM VIEW—EXPOSED PAD
1.65 ±0.10
(2 SIDES)
0.75 ±0.05
R = 0.125
TYP
2.38 ±0.10
(2 SIDES)
15
106
PIN 1
TOP MARK
(SEE NOTE 6)
0.200 REF
0.00 – 0.05
(DD) DFN REV C 0310
0.25 ±0.05
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
1.65 ±0.05
(2 SIDES)2.15 ±0.05
0.50
BSC
0.70 ±0.05
3.55
±0.05
PACKAGE
OUTLINE
0.25 ±0.05
0.50 BSC
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
PIN 1 NOTCH
R = 0.20 OR
0.35 × 45°
CHAMFER
Please refer to http://www.linear.com/product/LTC2856-1#packaging for the most recent package drawings.
MSfl Package D ass: [I ‘27 ( L735: L705) ’innnnj am 320 345 [ my :25 was) 042 0038 ‘ DLHJEE[:§5; (mas urns % \ 17
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
17
285678fg
For more information www.linear.com/LTC2856-1
PACKAGE DESCRIPTION
MSOP (MS8) 0213 REV G
0.53 ±0.152
(.021 ±.006)
SEATING
PLANE
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.18
(.007)
0.254
(.010)
1.10
(.043)
MAX
0.22 – 0.38
(.009 – .015)
TYP
0.1016 ±0.0508
(.004 ±.002)
0.86
(.034)
REF
0.65
(.0256)
BSC
0° – 6° TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
1 2 34
4.90 ±0.152
(.193 ±.006)
8765
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
0.52
(.0205)
REF
5.10
(.201)
MIN
3.20 – 3.45
(.126 – .136)
0.889 ±0.127
(.035 ±.005)
RECOMMENDED SOLDER PAD LAYOUT
0.42 ± 0.038
(.0165 ±.0015)
TYP
0.65
(.0256)
BSC
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev G)
Please refer to http://www.linear.com/product/LTC2856-1#packaging for the most recent package drawings.
18 MS Package 0339 0‘27 (:uas nus) m i 320 345 (2m) H26; ms 0305 0038 ‘ ‘+ mm! 050 a e (mm mm) (m?)
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
18
285678fg
For more information www.linear.com/LTC2856-1
PACKAGE DESCRIPTION
MSOP (MS) 0213 REV F
0.53 ±0.152
(.021 ±.006)
SEATING
PLANE
0.18
(.007)
1.10
(.043)
MAX
0.17 –0.27
(.007 – .011)
TYP
0.86
(.034)
REF
0.50
(.0197)
BSC
1234 5
4.90 ±0.152
(.193 ±.006)
0.497 ±0.076
(.0196 ±.003)
REF
8910 76
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.254
(.010) 0° – 6° TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
5.10
(.201)
MIN
3.20 – 3.45
(.126 – .136)
0.889 ±0.127
(.035 ±.005)
RECOMMENDED SOLDER PAD LAYOUT
0.305 ±0.038
(.0120 ±.0015)
TYP
0.50
(.0197)
BSC
0.1016 ±0.0508
(.004 ±.002)
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661 Rev F)
Please refer to http://www.linear.com/product/LTC2856-1#packaging for the most recent package drawings.
19
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
19
285678fg
For more information www.linear.com/LTC2856-1
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
F 11/13 Corrected θJA and θJC values. 2
G 09/17 Added H-Grade test condition for IOZD 4
(Revision history begins at Rev F)
20
LTC2856-1/LTC2856-2
LTC2857-1/LTC2857-2
LTC2858-1/LTC2858-2
20
285678fg
For more information www.linear.com/LTC2856-1
LINEAR TECHNOLOGY CORPORATION 2006
LT 0917 REV G • PRINTED IN USA
www.linear.com/LTC2856-1
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC485 Low Power RS485 Interface Transceiver ICC = 300µA (Typ)
LTC491 Differential RS485 Driver and Receiver Pair ICC = 300µA
LTC1480 3.3V Ultralow Power RS485 Transceiver 3.3V Operation
LTC1483 Ultralow Power RS485 Low EMI Transceiver Controlled Driver Slew Rate
LTC1485 Differential Bus Transceiver 10Mbaud Operation
LTC1487 Ultralow Power RS485 with Low EMI, Shutdown and High Input
Impedance
Up to 256 Transceiver on the Bus
LTC1520 50Mbps Precision Quad Line Receiver Channel-to-Channel Skew 400ps (Typ)
LTC1535 Isolated RS485 Full-Duplex Transceiver 2500VRMS Isolation in Surface Mount Package
LTC1685 52Mbps RS485 Transceiver with Precision Delay Propagation Delay Skew 500ps (Typ)
LT1785 60V Fault Protected RS485 Transceiver 60V Tolerant, ±15kV ESD
LTC2859/LTC2861
20Mbps RS485 Transceivers with Integrated Switchable Termination Integrated, Switchable,120Ω Termination Resistor, ±15kV ESD
Multi-Node Network and End Termination Using the LTC2856-1
RD
LTC2856-1
RD
LTC2856-1
D
TE = 5V
R
D
TE = 5V
285678 TA03
R
LTC2859LTC2859
TYPICAL APPLICATION

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