DS275S+T&R

Overview

The DS275S+T&R is a line-powered RS-232 transceiver in an 8-pin SOIC package. It features ultra-low static current by stealing power from the receive signal line during negative states, significantly reducing battery drain in portable systems. The device operates with a logic supply (VCC) of 4.5 to 5.5 V and a transmit driver supply (VDRV) ranging from 4.5 to 13 V. Static supply current is typically 10 µA when TXIN is high and 15 µA when low. Dynamic current reaches up to 800 µA for the driver and 100 µA for logic during active transmission. The receiver input threshold has 0.5–0.8 V hysteresis, and propagation delay is typically 5 µs.

Feature Summary

• Steals power from the RS-232 receive signal line to minimize static current consumption
• Compatible with standard RS-232-E signal levels for serial port interfacing
• Supports variable transmitter voltage levels between +5 and +12 volts
• Includes internal current-limiting circuitry to prevent damage from output short circuits

Applications

• Battery-backed laptop computers
• Remote sensor networks
• Portable medical instruments
• Handheld products requiring low-power serial interfaces

Procurement Notes

Verify the specific suffix T&R indicates tape-and-reel packaging configuration before ordering. Confirm that the DS275S variant matches the required 8-pin SOIC footprint. Ensure the system design accommodates the VDRV pin requirements relative to VCC. Check for any environmental compliance markings on the component body if RoHS or REACH adherence is mandatory for the final assembly.

Selection Notes

Select this component when minimizing static power drain is critical for battery-operated devices connected to RS-232 ports. It is suitable for half-duplex applications where the receive line remains idle in the marking state. Consider the full-duplex circuit modification if simultaneous transmission and reception are required with receivers needing negative mark voltages. Ensure the cable length does not exceed 10 feet for optimal signal integrity without meeting all strict RS-232 termination specifications.

Part Context

The DS275 series includes variants such as the DS275 in an 8-pin DIP and the DS275E in a 14-pin TSSOP. The DS275S specifically denotes the 8-pin SOIC package version. All variants share the same core functionality of line-powered RS-232 interfacing. The S suffix identifies the small-outline integrated circuit form factor, distinguishing it from through-hole or wider surface-mount options within the same product family.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with existing RS-232 port specifications if replacing legacy components. Ensure that any alternative device supports similar low-power characteristics and voltage ranges for VDRV and VCC.