DS276S+

Overview

The DS276S+ is a low-power RS-232 transceiver in an 8-pin SOIC package. 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, drawing as little as 1.5 µA when idle. A key characteristic is its ability to power the negative transmit driver rail by stealing energy from the receive signal line during marking states. Electrical specifications include a typical propagation delay of 5 µs and an output slew rate limited to less than 30 V/µs.

Feature Summary

• Line-powered operation that minimizes system battery drain by deriving negative voltage from the receive signal
• Ultra-low quiescent current suitable for extended standby periods in portable equipment
• CMOS/TTL compatible receiver output with hysteresis for improved noise immunity
• Integrated short-circuit protection on the transmit output

Applications

• Battery-operated handheld devices requiring serial connectivity
• Remote sensor networks with strict power constraints
• Portable medical instruments
• Laptop computers utilizing serial ports

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix matches the required package type. Check for RoHS compliance documentation relevant to the manufacturing date code. Ensure storage conditions align with the specified temperature range to maintain reliability.

Selection Notes

Select this component for applications prioritizing minimal static power consumption over high-speed transmission. Verify that the connected RS-232 port can tolerate output voltage levels below the standard ±5V requirement. Ensure the design accommodates the external reservoir capacitor and diode necessary for full-duplex negative rail generation.

Part Context

The DS276 series represents a specialized class of interface ICs designed specifically for battery-backed systems where traditional charge-pump transceivers would deplete power reserves too quickly. Manufactured by Maxim Integrated, now part of Analog Devices Inc., these components address the unique power management challenges of maintaining serial connections in low-power environments.

Replacement Considerations

DS275S+