特点
No Damage or Latchup to ±15kV ESD (Human Body
Model), IEC1000-4-2 Level 4 (±8kV) Contact and Level 3 (±8kV)
Guaranteed High Receiver Output State for
Floating, Shorted or Terminated Inputs with No
Signal Present
Drives Low Cost Residential Telephone Wires
I
CC
= 600μA Max with No Load
Single 5V Supply
?7V to 12V Common Mode Range Permits ±7V
Ground Difference Between Devices on the Data Line
Power-Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Transceiver
Driver Maintains High Impedance with the Power Off
Up to 32 Transceivers on the Bus
Pin Compatible with the SN75179 and LTC490
Available in SO,
MSOP
and PDIP Packages
典型应用
描述
描述 The LTC?1690 is a low power receiver/driver pair that is compatible with the requirements of RS485 and RS422. The receiver offers a fail-safe feature that guarantees a high receiver output state when the inputs are left open, shorted together or terminated with no signal present. No external components are required to ensure the high receiver output state. Separate driver output and receiver input pins allow full duplex operation. 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 LTC1690 is fully specified over the commercial and industrial temperature ranges. The LTC1690 is available in 8-Pin SO, MSOP and PDIP packages.