LTC1690 - Differential Driver and Receiver Pair with Fail-Safe Receiver Output

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.

Features

No Damage or Latchup to ±15kV ESD (Human BodyModel), IEC1000-4-2 Level 4 (±8kV) Contact and Level 3 (±8kV)
Guaranteed High Receiver Output State forFloating, Shorted or Terminated Inputs with NoSignal Present
Drives Low Cost Residential Telephone Wires
ICC = 600µA Max with No Load
Single 5V Supply
–7V to 12V Common Mode Range Permits ±7VGround Difference Between Devices on the Data Line
Power-Up/Down Glitch-Free Driver Outputs PermitLive 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

Typical Application

Applications

Battery-Powered RS485/RS422 Applications
Low Power RS485/RS422 Transceiver
Level Translator
Line Repeater

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC1690CMS8#PBF	MS-8	C	$2.85	$2.00
LTC1690CMS8#TRPBF	MS-8	C		$2.06
LTC1690CN8#PBF	N-8	C	$2.25	$1.65
LTC1690CS8#PBF	SO-8	C	$2.35	$1.75
LTC1690CS8#TRPBF	SO-8	C		$1.81
LTC1690IN8#PBF	N-8	I	$2.90	$2.15
LTC1690IS8#PBF	SO-8	I	$3.10	$2.25
LTC1690IS8#TRPBF	SO-8	I		$2.31