DS275

Overview

The DS275 is a low-power CMOS RS-232 transceiver designed for battery-backed systems. It operates with a logic supply (VCC) of 4.5V to 5.5V and a transmit driver supply (VDRV) ranging from 4.5V to 13V. The device features one receiver and one transmitter, functioning as a half-duplex interface. Static current consumption is minimized by stealing power from the receive signal line during negative states. Dynamic operating currents range from 40µA to 800µA depending on the state. The component supports an operating temperature range of 0°C to +70°C and is available in 8-pin DIP, 8-pin SOIC, and 14-pin TSSOP packages.

Feature Summary

• Transmitter steals power from the receive signal line to reduce static current drain
• Compatible with RS-232-E signals and standard serial ports
• Variable transmitter level capability from +5 to +12 volts
• Ultra-low static current consumption even when connected to an active port

Applications

• Battery-powered laptop computers
• Remote sensors
• Portable medical instruments
• Handheld products requiring low-cost serial interfaces

Procurement Notes

Verify the specific package variant required, such as the 8-pin DIP, 8-pin SOIC, or 14-pin TSSOP, as these are distinct part numbers within the family. Confirm that the VDRV supply voltage aligns with the system design, noting it must be greater than or equal to VCC. Ensure the application environment remains within the specified 0°C to +70°C operating temperature range for functional reliability.

Selection Notes

Select this component for applications prioritizing minimal power consumption over long cable lengths or high-speed synchronous communication. The device is optimized for asynchronous links under 10 feet. Designers must ensure the receiving end can interpret voltages slightly below the strict ±5V RS-232 minimum, typically accepting levels above 2V. Full-duplex operation requires external circuitry for proper negative voltage generation.

Part Context

The DS275 belongs to the Dallas Semiconductor/Maxim Integrated line of low-power interface devices. It serves as a specialized solution for extending battery life in portable electronics where traditional charge-pump RS-232 transceivers would cause excessive drain. The device integrates unique current-stealing architecture to maintain connectivity without significant power loss during idle periods.

Replacement Considerations

Direct replacements include the DS275S (SOIC package) and DS275E (TSSOP package). Verify pinout compatibility across package types before substitution.