DS3695ATM/NOPB

Overview

The DS3695ATM/NOPB is a multipoint RS485/RS422 transceiver manufactured by Texas Instruments. It operates on a single +5V supply with a voltage range of 4.75V to 5.25V. The device features one driver and one receiver, supporting half-duplex communication at data rates up to 10 Mb/s. It provides a bus common mode range from -7V to +12V, allowing for significant ground differences between devices. Key electrical parameters include a typical driver propagation delay of 15 ns with 2 ns skew, and a receiver hysteresis of 70 mV. The component is housed in an 8-SOIC surface-mount package and supports commercial operating temperatures from 0°C to +70°C.

Feature Summary

• Meets EIA standard RS485 requirements for multipoint bus transmission and maintains compatibility with RS-422 standards.
• Features TRI-STATE capability for both driver and receiver outputs, ensuring high impedance states during shutdown or power-off conditions.
• Includes thermal shutdown protection that forces driver outputs into a high-impedance state when excessive power dissipation occurs.
• Offers combined driver output and receiver input impedance equivalent to less than one RS485 unit load.

Applications

• Multipoint data transmission systems requiring extended common mode ranges.
• Industrial control networks utilizing RS485 or RS422 protocols.
• Bus interfaces where multiple devices share a common communication line.

Procurement Notes

Verify the specific suffix 'TM' against official documentation to confirm the package type and temperature grade. Confirm current production status as this series may be subject to discontinuation notices. Ensure the design accounts for the commercial temperature range limits specified in the datasheet.

Selection Notes

Select this component for applications requiring a single differential channel with robust fault protection. Consider the 8-SOIC package constraints for PCB layout. Verify that the system's ground potential differences remain within the specified -7V to +12V common mode range to ensure reliable operation.

Part Context

This part belongs to the DS3695 family of multipoint transceivers. It shares functional similarities with the DS3696 and DS3697 but differs in pinout and specific control features. The 'NOPB' suffix indicates lead-free construction compliant with RoHS standards.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult Texas Instruments for current alternatives if this component is discontinued.

FAQ

What is the purpose of the TS pin on the DS3695?

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 DS3695 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 on the bus?

Due to the low combined impedance of the driver output and receiver input (less than one RS485 unit load), up to 32 transceivers can be placed on the bus.