LT1791ACS#PBF

LT1791A is a 60V fault protected RS485/RS422 transceiver. It is a half-duplex and full-duplex differential bus transceiver for RS485 and RS422 applications which feature on-chip protection from overvoltage faults on the data transmission lines. Receiver input and driver output pins can withstand voltage faults up to ±60V with respect to ground with no damage to the device. Faults may occur while the transceiver is active, shut down or powered off. Data rates to 250Kbaud on networks of up to 128 nodes are supported. Controlled slew rates on the driver outputs control EMI emissions and improve data transmission integrity on improperly terminated lines. Drivers are specified to operate with inexpensive cables as low as 72ohm characteristic impedance. Application includes industrial control data networks, CAN bus applications and HVAC controls.

• Protected from overvoltage line faults to ±60V
• Pin compatible with LTC491
• High input impedance supports up to 128 nodes
• No damage/latchup to ESD (IEC-1000-4-2 level 4: ±15KV air/ level 2: ±4KV contact discharge)
• Controlled slew rates for EMI emissions control
• Outputs assume a high impedance when off or powered down
• Drives low cost, low impedance cables, short-circuit protection on all outputs
• Thermal shutdown protection, guaranteed operation to 125°C
• Typical differential driver output voltage (unloaded) is 4.1V at IO = 0
• 14-lead plastic SO package, 0°C to 70°C temperature range

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party