DS481TM

Overview

The DS481TM is a low-power RS-485/RS-422 multipoint transceiver manufactured by Texas Instruments. It features one driver and one receiver, operating from a single +5V supply with a recommended range of +4.75V to +5.25V. The device supports data rates up to 2.0 Mbps and operates within an industrial temperature range of -40°C to +85°C. Key electrical parameters include a typical quiescent current of 200 μA and a sleep mode current of 0.2 μA. It provides a minimum differential output voltage (VOD3) of 1.5V under full load and guarantees operation for up to 64 transceivers on the bus due to its half-unit load input characteristic.

Feature Summary

• Automatic sleep mode activated by inactivity on enable pins to minimize power consumption
• Half-unit load receiver input capability allowing up to 64 nodes on a single bus
• Integrated short-circuit current limiting and thermal shutdown protection for the driver

Applications

• Multipoint RS-485 communication networks
• RS-422 point-to-point or multipoint links
• Industrial sensor and actuator interfaces requiring low standby power

Procurement Notes

Verify the specific ordering suffix against the latest TI Package Option Addendum. The DS481TM/NOPB is listed with LIFEBUY status, indicating discontinuation. Confirm that the SOIC-8 package and lead finish meet the design requirements before finalizing procurement plans.

Selection Notes

Select this component when designing systems requiring high node density on RS-485 buses, as it supports up to 64 units. Ensure the application environment stays within the -40°C to +85°C industrial temperature range. Verify that the single +5V supply rail aligns with the system's power architecture.

Part Context

This part belongs to the DS481 series of low-power transceivers. It is functionally compatible with the MAX481C and MAX481E devices. The 'TM' suffix denotes the surface-mount SOIC package variant characterized for the industrial temperature range.

Replacement Considerations

Direct functional substitutes include the DS481TM/NOPB. Designers should verify pin compatibility and electrical specifications against the target replacement datasheet.