DS275E+

Overview

The DS275E+ is a line-powered RS-232 transceiver chip manufactured by Analog Devices Inc./Maxim Integrated. It operates within a logic supply voltage (VCC) range of 4.5 V to 5.5 V and a transmit driver supply (VDRV) range of 4.5 V to 13.0 V. The device functions as a half-duplex interface, translating RS-232 signal levels to CMOS/TTL levels with an input threshold of approximately 1.8 V and 0.5 V hysteresis. Static supply current is limited to a maximum of 20 µA when TXIN is at VCC or GND. Dynamic supply current reaches up to 800 µA for the driver and 100 µA for the logic section during active transitions. The component supports operation temperatures from 0°C to +70°C and is housed in a 14-pin TSSOP package.

Feature Summary

• Transmitter steals power from the receive signal line during negative states to minimize static current drain
• Compatible with RS-232-E signals while maintaining ultra-low power consumption for battery-backed systems
• Variable transmitter level capability ranging from +5 to +12 volts via the VDRV pin

Applications

• Battery-operated handheld products
• Laptop computers
• Remote sensors
• Portable medical instruments

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature grade. Confirm that the required VDRV voltage aligns with system capabilities, as it must remain greater than or equal to VCC. Ensure compliance with RoHS directives if applicable to the manufacturing batch. Check for availability status as discontinued parts may require alternative sourcing strategies.

Selection Notes

Select this component for applications requiring minimal static power draw when connected to an RS-32 port. Ensure the design maintains TXIN at a logic high state during idle periods to leverage the low-power stealing feature. Verify that cable lengths do not exceed ten feet to maintain signal integrity without meeting full RS-232 termination requirements.

Part Context

The DS275 series includes variants such as the DS275 (8-pin DIP), DS275S (8-pin SOIC), and DS275E (14-pin TSSOP). The DS275E+ specifically denotes the lead-free version of the 14-pin Thin-Shrink Small Outline Package. This family addresses the unique power constraints of portable devices where traditional charge-pump transceivers would deplete batteries rapidly.

Replacement Considerations

No public confirmed substitute part numbers are available.