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Low Power RS485
The LT C
485 is a low power differential bus/line trans-
ceiver designed for multipoint data transmission standard
RS485 applications with extended common mode range
(12V to –7V). It also meets the requirements of RS422.
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 dissipa
tion caused by bus contention or faults is prevented by a
thermal shutdown cir
cuit which for
ces 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.
Low Power: I
= 300μA Typ
Designed for RS485 Interface Applications
Single 5V Supply
–7V to 12V Bus Common Mode Range Permits
±7V Ground Difference Between Devices on the Bus
Thermal Shutdown Protection
Power-Up/Down Glitch-Free Driver Outputs
Permit Live Insertion or Removal of Transceiver
Driver Maintains High Impedance in Three-State
or with the Power Off
Combined Impedance of a Driver Output and
Receiver Allows Up to 32 Transceivers on the Bus
(C- and I-Grades)
70mV Typical Input Hysteresis
30ns Typical Driver Propagation Delays
with 5ns Skew for Up to 2.5MB Operation
Pin Compatible with ±60V Protected LTC2862
Low Power RS485/RS422 Transceiver
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