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LT1791IN Datasheet

  • LT1791IN

  • 60V Fault Protected RS485/RS422 Transceivers

  • 12頁

  • LINER

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LT1785/LT1785A
LT1791/LT1791A
60V Fault Protected
RS485/RS422 Transceivers
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
Protected from Overvoltage Line Faults to
鹵
60V
Pin Compatible with LTC485 and LTC491
High Input Impedance Supports Up to 128 Nodes
No Damage or Latchup to ESD
IEC-1000-4-2 Level 4:
鹵15kV
Air Discharge
IEC-1000-4-2 Level 2:
鹵4kV
Contact Discharge
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
The LT
廬
1785/LT1791 are half-duplex and full-duplex dif-
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
鹵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鈩?/div>
characteristic impedance.
The LT1785A/LT1791A devices have 鈥渇ail-safe鈥?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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Industrial Control Data Networks
CAN Bus Applications
HVAC Controls
TYPICAL APPLICATIO
RO1
RE1
DE1
DI1
RX
LT1785
Normal Operation Waveforms at 250kBaud
V
CC1
R
TERM
RO
TX
GND1
Y-Z
V
CC2
RO2
RE2
DE2
DI2
RX
LT1785
R
TERM
DI
TX
GND2
1785/91 TA01
U
1785/91 TA02
U
U
1

LT1791IN 產品屬性

  • LT1785/A, LT1791/A

  • 25

  • 集成電路 (IC)

  • 接口 - 驅動器，接收器，收發(fā)器

  • -

  • 收發(fā)器

  • 1/1

  • RS422，RS485

  • 4.75 V ~ 5.25 V

  • 通孔

  • 14-DIP（0.300"，7.62mm）

  • 14-PDIP

  • 管件

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