The LTC1690 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 shut- down 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.
The LTC1690 is a low‑power RS‑485/RS‑422 driver‑receiver pair that includes a fail‑safe receiver output, glitch‑free power‑up/down, and the ability to operate with up to 32 transceivers on a single bus. It offers a wide common‑mode range of –7 V to 12 V and can be powered from a single 5 V supply.
Typical applications include battery‑powered RS‑485/RS‑422 links, line repeaters, and level translation. The device is offered in 8‑lead SO, MSOP, and PDIP packages, and its performance is specified over commercial and industrial temperature ranges.
| Common‑Mode Input Range | –7 V to 12 V |
|---|---|
| Driver Output Voltage (High) | –7 V to 12 V |
| Supply Current (No Load) | 260 pA–600 pA |
The receiver includes a fail‑safe feature that guarantees a high output state when the inputs are left open, shorted together, or terminated.
Up to 32 transceivers can be placed on the same bus.
The LTC1690 is offered in SO, MSOP, and PDIP packages.