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LTC1690 Datasheet(Fiches technique) 1 Page - Linear Technology

Numéro de pièce LTC1690
Description  Differential Driver and Receiver Pair with Fail-Safe Receiver Output
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
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LTC1690
Differential Driver and
Receiver Pair with Fail-Safe
Receiver Output
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
®1690 is a low power receiver/driver pair that is
compatible with the requirements of RS485 and RS422.
The receiver offers a fail-safe feature that guarantees a
high receiver output state when the inputs are left open,
shorted together or terminated with no signal present. No
external components are required to ensure the high
receiver output state.
Separate driver output and receiver input pins allow full
duplex operation. Excessive power dissipation caused by
bus contention or faults is prevented by a thermal shut-
down circuit which forces the driver outputs into a high
impedance state.
The LTC1690 is fully specified over the commercial and
industrial temperature ranges. The LTC1690 is available in
8-Pin SO, MSOP and PDIP packages.
s
Battery-Powered RS485/RS422 Applications
s
Low Power RS485/RS422 Transceiver
s
Level Translator
s
Line Repeater
120
3
5
6
D1
120
2
8
7
R2
DRIVER
LTC1690
LTC1690
RECEIVER
120
2
7
8
Y1
Z1
B1
A1
A2
B2
Z2
Y2
R1
120
3
6
5
D2
RECEIVER
DRIVER
1690 TA01
s
No Damage or Latchup to
±15kV ESD (Human Body
Model), IEC1000-4-2 Level 4 (
±8kV) Contact and
Level 3 (
±8kV) Air Discharge
s
Guaranteed High Receiver Output State for
Floating, Shorted or Terminated Inputs with No
Signal Present
s
Drives Low Cost Residential Telephone Wires
s
ICC = 600µA Max with No Load
s
Single 5V Supply
s
–7V to 12V Common Mode Range Permits
±7V
Ground Difference Between Devices on the Data Line
s
Power-Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Transceiver
s
Driver Maintains High Impedance with the Power Off
s
Up to 32 Transceivers on the Bus
s
Pin Compatible with the SN75179 and LTC490
s
Available in SO, MSOP and PDIP Packages
D1
B2
A2
R2
1690 TA01a
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
DESCRIPTIO
Driving a 1000 Foot STP Cable




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