DS276S

Overview

The DS276S is an 8-pin SOIC line-powered RS-232 transceiver designed for low-power serial communication in battery-backed systems. It operates on a single 3V or 5V logic supply (VCC) and supports full-duplex data rates up to 20 kbps. The device features ultra-low static current consumption by stealing negative power from the receive signal line during marking states. Electrical specifications include a typical receiver input threshold of 1.8V with hysteresis, a propagation delay of 5µs, and an output slew rate limited to less than 30 V/µs. The transmitter driver supply (VDRV+) ranges from 3V to 12V, allowing compatibility with standard RS-232 ports while minimizing system power drain.

Feature Summary

• Line-powered operation that steals negative voltage from the receive signal line to minimize static power consumption
• Full-duplex capability supporting data rates up to 20 kbps with CMOS/TTL compatible inputs and outputs
• Integrated protection against short circuits and internal current-limiting circuitry to prevent damage

Applications

• Battery-operated handheld products requiring extended operational life
• Laptop computers and portable medical instruments with persistent serial connections
• Remote sensors where static current drain must be minimized when idle

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment upon receipt. Ensure storage conditions adhere to specified temperature limits to maintain reliability. Check for any specific handling requirements related to electrostatic discharge sensitivity during assembly.

Selection Notes

Select this component for applications prioritizing minimal static power draw over strict RS-232 voltage compliance. Ensure the design accommodates the unique requirement of deriving negative supply from the RXIN line. Verify that connected RS-232 receivers can correctly interpret output voltages above 2V as logical spaces if operating below standard voltage levels.

Part Context

The DS276S belongs to the DS276 family of low-power transceivers manufactured by Analog Devices Inc./Maxim Integrated. It serves as the surface-mount variant of the DS276 DIP package, offering identical electrical characteristics and functionality within an 8-pin SOIC form factor suitable for automated PCB assembly.

Replacement Considerations

No public confirmed substitute part numbers are available.