DS275

Line-Powered RS-232 Transceiver Chip

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Overview

Low-power serial transmitter/receiver for battery-powered systems
Power-saving transmitter steals power from receive signal
Ultra-low-static current, even connected to RS-232-E port
Transmitter level varies from +5 to +12V
Compatible with RS-232-E signals
Low-power CMOS

The DS275 Line-Powered RS-232 Transceiver Chip derives power from the data line providing an extremely low-cost and low-power RS-232 serial port interface. The receiver input translates RS-232 signal levels to common CMOS/TTL levels. The transmitter circuit steals current from the receive RS-232 signal when that signal is in a negative state (marking). Since most serial communication ports remain in a negative state statically, using the receive signal for negative power greatly reduces the DS275's static power consumption.

The DS275's power-saving interface is ideal for connecting battery-powered systems such as laptop computers, remote sensors, and portable instrumentation.