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LTC485C Datasheet

  • LTC485C

  • Linear Technology [Low Power RS485 Interface Transceiver]

  • 328.94KB

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LTC485
Low Power RS485
Interface Transceiver
FEATURES
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DESCRIPTIO
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Low Power: I
CC
= 300碌A Typ
Designed for RS485 Interface Applications
Single 5V supply
鈥?7V to 12V Bus Common-Mode Range Permits
卤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
70mV Typical Input Hysteresis
30ns Typical Driver Propagation Delays
with 5ns Skew
Pin Compatible with the SN75176A, DS75176A
and
碌A96176
The LTC485 is a low power differential bus/line transceiver
designed for multipoint data transmission standard RS485
applications with extended common-mode range (12V to
鈥?7V). It also meets the requirements of RS422.
The CMOS design offers significant power savings over its
bipolar counterpart without sacrificing ruggedness against
overload of 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.
APPLICATI
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S
Low Power RS485/RS422 Transceiver
Level Translator
TYPICAL APPLICATI
RO1
RE1
DE1
DI1
D
R
V
CC1
Rt
GND1
A
Rt
RO2
RE2
DE2
DI2
D
GND2
LTC485 鈥?TA01
R
V
CC2
B
U
Driver Outputs
LTC485 鈥?TA02
UO
UO
1

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