lt1785a Linear Technology Corporation, lt1785a Datasheet
lt1785a
Manufacturer Part Number
lt1785a
Description
60v Fault Protected Rs485/rs422 Transceivers
Manufacturer
Linear Technology Corporation
Datasheet
1.LT1785A.pdf
(12 pages)
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APPLICATIO S
FEATURES
TYPICAL APPLICATIO
Protected from Overvoltage Line Faults to 60V
Pin Compatible with LTC485 and LTC491
High Input Impedance Supports Up to 128 Nodes
No Damage or Latchup to ESD
Controlled Slew Rates for EMI Emissions Control
Guaranteed High Receiver Output State for Floating,
Shorted or Inactive Inputs
Outputs Assume a High Impedance When Off or
Powered Down
Drives Low Cost, Low Impedance Cables
Short-Circuit Protection on All Outputs
Thermal Shutdown Protection
Industrial Control Data Networks
CAN Bus Applications
HVAC Controls
IEC-1000-4-2 Level 4: 15kV Air Discharge
IEC-1000-4-2 Level 2: 4kV Contact Discharge
RO1
RO2
RE1
DE1
RE2
DE2
DI1
DI2
U
TX
TX
LT1785
LT1785
RX
RX
U
V
V
GND1
GND2
CC2
CC1
R
R
TERM
TERM
1785/91 TA01
The LT
ferential bus transceivers for RS485 and RS422 applica-
tions which feature on-chip protection from overvoltage
faults on the data transmission lines. Receiver input and
driver output pins can withstand voltage faults up to 60V
with respect to ground with no damage to the device.
Faults may occur while the transceiver is active, shut down
or powered off.
Data rates to 250kbaud on networks of up to 128 nodes are
supported. Controlled slew rates on the driver outputs
control EMI emissions and improve data transmission
integrity on improperly terminated lines. Drivers are speci-
fied to operate with inexpensive cables as low as 72
characteristic impedance.
The LT1785A/LT1791A devices have “fail-safe” receiver
inputs to guarantee a receiver output high for shorted,
open or inactive data lines. On-chip ESD protection elimi-
nates need for external protection devices.
The LT1785/LT1785A are available in 8-lead DIP and SO
packages and the LT1791/LT1791A in 14-lead DIP and SO
packages.
DESCRIPTIO
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
Y-Z
1785/LT1791 are half-duplex and full-duplex dif-
RO
RS485/RS422 Transceivers
DI
Normal Operation Waveforms at 250kBaud
60V Fault Protected
U
LT1785/LT1785A
LT1791/LT1791A
1785/91 TA02
1
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