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LTC491C Datasheet

  • LTC491C

  • Linear Technology [Differential Driver and Receiver Pair]

  • LINER

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LTC491
Differential Driver and
Receiver Pair
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Low Power: I
CC
= 300碌A Typical
Designed for RS485 or RS422 Applications
Single +5V Supply
鈥?V to +12V Bus Common Mode Range
Permits
鹵7V
Ground Difference Between Devices
on the Bus
Thermal Shutdown Protection
Power-Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Package
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
28ns Typical Driver Propagation Delays with 5ns
Skew
Pin Compatible with the SN75180
The LTC491 is a low power differential bus/line transceiver
designed for multipoint data transmission standard RS485
applications with extended common mode range (+12V to
鈥?V). 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 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.
Both AC and DC specifications are guaranteed from 0擄C to
70擄C and 4.75V to 5.25V supply voltage range.
APPLICATI
s
s
S
Low Power RS485/RS422 Transceiver
Level Translator
TYPICAL APPLICATI
DE
4
9
D
5
DRIVER
120鈩?/div>
10
4000 FT 24 GAUGE TWISTED PAIR
LTC491
12
R
2
RECEIVER
120鈩?/div>
11
4000 FT 24 GAUGE TWISTED PAIR
3
REB
120鈩?/div>
DRIVER
D
LTC491
120鈩?/div>
RECEIVER
R
U
DE
REB
LTC491 鈥?TA01
UO
UO
1

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