LTC485
Low Power RS485
Interface Transceiver
FEATURES
DESCRIPTION
Low Power: ICC = 300μA Typ
nn Designed for RS485 Interface Applications
nn Single 5V Supply
nn –7V to 12V Bus Common Mode Range Permits
±7V Ground Difference Between Devices on the Bus
nn Thermal Shutdown Protection
nn Power-Up/Down Glitch-Free Driver Outputs
Permit Live Insertion or Removal of Transceiver
nn Driver Maintains High Impedance in Three-State
or with the Power Off
nn Combined Impedance of a Driver Output and
Receiver Allows Up to 32 Transceivers on the Bus
nn (C- and I-Grades)
nn 70mV Typical Input Hysteresis
nn 30ns Typical Driver Propagation Delays
with 5ns Skew for Up to 2.5MB Operation
nn Pin Compatible with ±60V Protected LTC2862
The LTC®485 is a low power differential bus/line transceiver designed for multipoint data transmission standard
RS485 applications with extended common mode range
(12V to –7V). It also meets the requirements of RS422.
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APPLICATIONS
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The CMOS design offers significant power savings over
its bipolar counterpart without sacrificing ruggedness
against overload or ESD damage.
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 LTC485 is fully specified over the commercial and
extended industrial temperature range.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Low Power RS485/RS422 Transceiver
Level Translator
TYPICAL APPLICATION
Driver Outputs
RO1
R
VCC1
RE1
DI1
RO2
A
Rt
DE1
D
R
GND1
VCC2
Rt
RE2
DE2
DI2
D
B
GND2
485 TA01a
485 TA01b
485fl
For more information www.linear.com/LTC485
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