DS3695TN

Overview

The DS3695TN is a multipoint RS-485/RS-422 transceiver manufactured by Texas Instruments. It operates on a single +5V supply and meets EIA standard RS-485 requirements with an extended common mode range of -7V to +12V, allowing up to ±7V ground difference between devices. The device features 15 ns typical driver propagation delay with 2 ns skew. It includes thermal shutdown protection and maintains high impedance to the bus when in TRI-STATE or power-off states. The combined impedance of the driver output and receiver input is less than one RS-485 unit load, supporting up to 32 transceivers on the bus.

Feature Summary

• Extended common mode range permits significant ground differences between devices on the bus.
• Thermal shutdown protection triggers high-impedance state during excessive power dissipation.
• Low combined driver and receiver impedance allows connection of multiple transceivers.

Applications

• Multipoint data transmission systems requiring RS-485 compliance
• Industrial communication networks with potential ground potential differences
• Bus line applications supporting up to 32 transceivers

Procurement Notes

Verify the specific suffix 'TN' indicates the industrial temperature grade (-40°C to +85°C) as distinct from the commercial grade 'N'. Confirm RoHS compliance status and lifetime buy availability through official TI channels. Ensure the PDIP-8 package matches the design footprint requirements.

Selection Notes

Select this component for applications requiring robust multipoint communication over long distances with varying ground potentials. Consider the DS3695T variant if industrial temperature operation is required. Verify that the system logic levels match the specified VIH and VIL thresholds before integration.

Part Context

This part belongs to the DS3695 family of differential bus transceivers/repeaters. It is functionally similar to the DS3695 but distinguished by its extended temperature rating. The family supports both RS-485 and RS-422 standards, providing versatile interface solutions for industrial and commercial environments.

Replacement Considerations

DS3695N/NOPB (Commercial Grade)

FAQ

What is the purpose of the TS pin?

The TS pin is an open-collector output with an internal 10 kΩ pull-up resistor that reports the occurrence of thermal shutdown within the device.

How does the device handle bus faults?

Bus faults causing excessive power dissipation trigger a thermal shutdown circuit, which forces the driver outputs into a high-impedance state to protect the device.

What is the maximum number of transceivers supported?

The combined impedance of the driver output and receiver input is less than one RS-485 unit load, allowing up to 32 transceivers on the bus.