LTC486_15 Datasheet, PDF (1/14 Pages) Linear Technology – Quad Low Power RS485 Driver

FEATURES
n _{Very Low Power: ICC = 110µA Typ}
n _{Designed for RS485 or RS422 Applications}
n _{Single 5V Supply}
n _{–7V to 12V Bus Common-Mode Range Permits ±7V}
GND Difference Between Devices on the Bus
n _{Thermal Shutdown Protection}
n _{Power-Up/Down Glitch-Free Driver Outputs Permit}
Live Insertion/Removal of Package
n _{Driver Maintains High Impedance in Three-State or}
with the Power Off
n _{28ns Typical Driver Propagation Delays with 5ns}
Skew
n _{Pin Compatible with the SN75172, DS96172,}
µA96172, and DS96F172
APPLICATIONS
n _{Low Power RS485/RS422 Drivers}
n _{Level Translator}
LTC486
Quad Low Power
RS485 Driver
DESCRIPTION
The LTC^®486 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.
L, LT, LTC, LTM, Linear Technology, µModule and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
EN
4
DI ¹ DRIVER
1/4 LTC486
12
EN
120Ω
120Ω
4000 FT BELDEN 9841
EN
2
4
RECEIVER
3 _RO
1
1/4 LTC488
486 TA01a
RS485 Length Specification
10k
1k
100
10
10k
100k
1M 2.5M 10M
DATA RATE (bps)
486 TA01b
* APPLIES FOR 24 GAUGE, POLYETHYLENE
DIELECTRIC TWISTED PAIR
486fc
1