DS36C278M

Overview

The DS36C278M is a low-power CMOS differential transceiver compliant with RS-485 standards and compatible with TIA/EIA-422-B. It features one driver and one receiver in an 8-pin SOIC package, operating at a supply voltage of +5V (range +4.75V to +5.25V). The device supports a maximum data rate of 10 Mb/s with propagation delays up to 80 ns for the driver and 400 ns for the receiver. It operates within a commercial temperature range of 0°C to +70°C and includes thermal shutdown protection.

Feature Summary

• Low power CMOS design with guaranteed interoperation
• Built-in glitch-free circuitry for live insertion
• Thermal shutdown protection against excessive dissipation

Applications

• Multipoint data transmission systems
• Battery-powered applications requiring low current consumption
• Industrial communication networks

Procurement Notes

Verify the specific suffix 'M' indicates the commercial temperature grade (0°C to +70°C) rather than the industrial grade (-40°C to +85°C). Confirm the package type matches the required PCB footprint. Check the current production status as some variants may be marked as Lifebuy or Not Recommended for New Designs.

Selection Notes

Select this component when a standard RS-485 transceiver is needed for commercial environments. Ensure the application does not require the extended industrial temperature range, which necessitates the 'TM' variant. Verify that the 1/4 unit load capability meets the node count requirements for the bus topology.

Part Context

This part belongs to the DS36C27x family of low-power multipoint transceivers from Texas Instruments. It serves as a drop-in replacement for older bipolar devices like the MAX485 while offering reduced power consumption. The family includes variants with different temperature ratings and additional features such as slew rate control.

Replacement Considerations

DS36C278TM/NOPB

FAQ

What is the difference between DS36C278M and DS36C278TM?

The primary difference is the operating temperature range. The DS36C278M is rated for commercial temperatures (0°C to +70°C), while the DS36C278TM is rated for industrial temperatures (-40°C to +85°C).

Does the DS36C278M support half-duplex communication?

Yes, the DS36C278M is a half-duplex transceiver with one driver and one receiver, controlled by separate DE and RE* pins.