LTC1485
1
1485fb
For more information www.linear.com/LTC1485
TYPICAL APPLICATION
FEATURES DESCRIPTION
Differential
Bus Transceiver
The LT C
®
1485 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 with Schottky 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 circuit which forces the driver outputs
into a high impedance state. I/O pins are protected against
multiple ESD strikes of over ±10kV.
The receiver has a fail-safe feature which guarantees a
high output state when the inputs are left open.
Both AC and DC specifications are guaranteed from –40°C
to 85°C and 4.75V to 5.25V supply voltage range.
APPLICATIONS
n
ESD Protection Over ±10kV
n
Low Power: I
CC
= 1.8mA Typ
n
28ns Typical Driver Propagation Delays
with4nsSkew
n
Designed for RS485 or RS422 Applications
n
Single 5V Supply
n
−7V to 12V Bus Common-Mode Range Permits
±7VGround Difference Between Devices on the Bus
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Thermal Shutdown Protection
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Power-Up/Down Glitch-Free Driver Outputs
n
Driver Maintains High Impedance in Three-State or
with the Power Off
n
Combined Impedance of a Driver Output and
ReceiverAllows up to 32 Transceivers on the Bus
n
60mV Typical Input Hysteresis
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Pin-Compatible with the SN75176A, DS75176A,
andSN75LBC176
n
Low Power RS485/RS422 Transceiver
n
Level Translator
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.
DI
RO
4
3
6
7
2
DE
120Ω
120Ω
DRIVER
RECEIVER
DE
3
4
RO
DI
2
1
6
7
4000 FT 24 GAUGE TWISTED PAIR
1485 TA01
LTC1485 LTC1485
RECEIVER
DRIVER
RE
RE
8
5V
8
5V
5
5
1