LTC486
Quad Low Power
RS485 Driver
FEATURES
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DESCRIPTIO
Very Low Power: I
CC
= 110µA Typ
Designed for RS485 or RS422 Applications
Single 5V Supply
– 7V to 12V Bus Common-Mode Range Permits
±
7V GND Difference Between Devices on the Bus
Thermal Shutdown Protection
Power-Up/Down Glitch-Free Driver Outputs Permit
Live Insertion/Removal of Package
Driver Maintains High Impedance in Three-State or
with the Power Off
28ns Typical Driver Propagation Delays
with 5ns Skew
Pin Compatible with the SN75172, DS96172,
µA96172,
and DS96F172
The LTC486 is a low power differential bus/line driver
designed for multipoint data transmission standard RS485
applications with extended common-mode range (12V to
–7V). It also meets RS422 requirements.
The CMOS design offers significant power savings over its
bipolar counterpart without sacrificing ruggedness against
overload or ESD damage.
The driver features 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.
Both AC and DC specifications are guaranteed from 0°C to
70°C (Commercial), – 40°C to 85°C (Industrial), over the
4.75V to 5.25V supply voltage range.
APPLICATI
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S
Low Power RS485/RS422 Drivers
Level Translator
TYPICAL APPLICATI
CABLE LENGTH (FT)
EN
EN
4
DI
1
DRIVER
12
1/4 LTC486
EN
120Ω
4000 FT BELDEN 9841
120Ω
2
4
RECEIVER
3
RO
1
1/4 LTC488
LTC486 • TA01
U
RS485 Cable Length Specification*
10k
1k
100
10
10k
100k
1M
2.5M
10M
DATA RATE (bps)
LTC486 • TA09
UO
UO
* APPLIES FOR 24 GAUGE, POLYETHYLENE
DIELECTRIC TWISTED PAIR
1
LINER [ LINEAR TECHNOLOGY ]
