SP3249E - Sipex

SP3249E Intelligent +3.0V to +5.5V RS-232 Transceivers

The SP3249E device is an RS-232 transceiver solution intended for portable or hand-held applications such as notebook and palmtop computers. The SP3249E uses an internal high-efficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V operation. This charge pump and Sipex's driver architecture allow the SP3249E device to deliver complian.

Features

Sipex's proprietary and patented (U.S. #5,306,954) on-board charge pump circuitry that generates ±5.5V RS-232 voltage levels from a single +3.0V to +5.5V power supply. The SP3249E device can operate at a data rate of 250kbps fully loaded. The SP3249E is a 5-driver/3-receiver device, ideal for portable or hand-held applications. The SP3249E device is an ideal choice for power sensitive designs. THEORY OF OPERATION The SP3249E device is made up of three basic circuit blocks: 1. Drivers, 2. Receivers, and 3. the Sipex proprietary charge pump. Drivers The drivers are inverting level transmitters t.