DS36C280TM/NOPB

Overview

The DS36C280TM/NOPB is a low-power, slew-rate-controlled CMOS transceiver designed for multipoint data transmission in accordance with the RS-485 standard and compatible with TIA/EIA-422-B. It features an adjustable slew rate control to minimize electromagnetic interference (EMI) effects. The device operates on a single +5V supply with a maximum quiescent current of 500 μA. It provides a wide common mode range from −7V to +12V and includes built-in thermal shutdown circuitry to prevent damage during excessive power dissipation. The receiver incorporates an open input fail-safe feature that guarantees a high output state when inputs are left non-terminated. This specific variant supports up to 64 nodes on a bus due to its ½ unit load configuration.

Feature Summary

• Adjustable Slew Rate Control: Allows users to set driver rise and fall times using an external resistor to reduce switching EMI.
• High Node Capacity: Designed as a ½ unit load device, supporting up to 64 nodes on a single bus.
• Robust Protection Features: Includes built-in thermal shutdown to protect against excessive power dissipation and an open input fail-safe mechanism.
• Glitch-Free Operation: Built-in power-up/down glitch-free circuitry permits live insertion and displacement without signal corruption.

Applications

• Multipoint communication systems requiring RS-485 compliance
• Battery-powered or power-conscious industrial applications
• Systems requiring live transceiver insertion or displacement

Procurement Notes

Verify the component status before procurement, as the DS36C280TM/NOPB is listed as obsolete in official documentation. Confirm availability through authorized distributors or secondary markets if sourcing for production. Ensure the package type matches the design requirements, specifically the SOIC-8 (D) package. Check for RoHS compliance details relevant to the manufacturing date code.

Selection Notes

Select this component when designing systems that require reduced electromagnetic interference through controlled edge rates. Choose the TM suffix variant specifically for industrial temperature ranges (-40°C to +85°C). Consider the ½ unit load capability if the application requires connecting more than 32 nodes on a single bus segment without repeaters.

Part Context

The DS36C280 belongs to Texas Instruments' family of RS-485/RS-422 transceivers. It shares architectural similarities with the DS36C278 and DS36C279 but distinguishes itself by offering adjustable slew rate control rather than automatic sleep modes. It serves as a robust interface solution for noisy environments where EMI management is critical.

Replacement Considerations

DS36C280M/NOPB: Commercial temperature version (0°C to +70°C). DS36C280MX/NOPB: Tape and reel packaging variant of the commercial version. Note that these are also marked as obsolete.