LTC490_04 Datasheet, PDF (1/12 Pages) Linear Technology – Differential Driver and Receiver Pair

FEATURES
s _{Low Power: ICC = 300µA Typical}
s _{Designed for RS485 or RS422 Applications}
s _{Single 5V Supply}
s _{– 7V to 12V Bus Common Mode Range}
Permits ±7V Ground Difference Between Devices
on the Bus
s _{Thermal Shutdown Protection}
s _{Power-Up/-Down Glitch-Free Driver Outputs Permit}
Live Insertion or Removal of Package
s _{Driver Maintains High Impedance with the}
Power Off
s _{Combined Impedance of a Driver Output and}
Receiver Allows up to 32 Transceivers on the Bus
s _{70mV Typical Input Hysteresis}
s _{28ns Typical Driver Propagation Delays with}
5ns Skew for 2.5MB Operation
s _{Pin Compatible with the SN75179}
s _{Available in 8-Lead PDIP and SO Packages}
U
APPLICATIO S
s _{Low Power RS485/RS422 Transceiver}
s _{Level Translator}
LTC490
Differential Driver and
Receiver Pair
DESCRIPTIO
The LTC^®490 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 design offers significant power savings over its
bipolar counterpart without sacrificing ruggedness against
overload or ESD damage.
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°C to
70°C and 4.75V to 5.25V supply voltage range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
LTC490
3
D
DRIVER
2
R
RECEIVER
5
120Ω
6
4000 FT BELDEN 9841
120Ω
8
120Ω
7
120Ω
4000 FT BELDEN 9841
LTC490
RECEIVER
R
DRIVER
D
LTC490 • TA01
490fb
1