LTC1481_15 Datasheet, PDF (1/8 Pages) Linear Technology – Ultralow Power RS485 Transceiver with Shutdown

FEATURES
s _{Low Power: ICC = 120µA Max with Driver Disabled}
s _{Drivers/Receivers Have ±10kV ESD Protection}
s _{1µA Quiescent Current in Shutdown Mode}
s _{High Speed: Up to 2.5Mbits/s Data Rate}
s _{ICC = 500µA Max with Driver Enabled, No Load}
s _{Single 5V Supply}
s _{– 7V to 12V Common Mode Range Permits ±7V}
Ground Difference Between Devices on the Data Line
s _{Thermal Shutdown Protection}
s _{Power Up/Down Glitch-Free Driver Outputs Permit}
Live Insertion or Removal of Transceiver
s _{Driver Maintains High Impedance in Three-State}
or with the Power Off
s _{Up to 32 Transceivers on the Bus}
s _{30ns Typical Driver Propagation Delays}
with 5ns Skew
s _{Pin Compatible with the LTC485}
U
APPLICATIO S
s _{Battery-Powered RS485/RS422 Applications}
s _{Low Power RS485/RS422 Transceiver}
s _{Level Translator}
LTC1481
Ultralow Power
RS485 Transceiver
with Shutdown
DESCRIPTIO
The LTC^®1481 is an ultralow power differential line trans-
ceiver designed for data transmission standard RS485
applications. It will also meet the requirements of RS422.
The CMOS design offers significant power savings over its
bipolar counterparts without sacrificing ruggedness against
overload or ESD damage. Typical quiescent current is only
80µA while operating and less than 1µA in shutdown.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common mode range. Excessive power dissipation
caused by bus contention or faults is prevented by a
thermal shutdown circuit which forces the driver outputs
into a high impedance state. The receiver has a fail-safe
feature which guarantees a high output state when the
inputs are left open.
The LTC1481 is fully specified over the commercial and
extended industrial temperature range and is available in
8-pin PDIP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
RO1
R
V_CC1
RE1
Rt
DE1
DI1
D
GND1
Rt
RO2
R
V_CC2
RE2
DE2
DI2
D
GND2
LTC1481 • TA01
Supply Current vs Temperature
350
300
THERMAL SHUTDOWN
WITH DRIVER ENABLED
250
DRIVER ENABLED
200
150
100
DRIVER DISABLED
50
0
–50 –25
0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1481 TA02
1481fa
1