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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 405

New developments in RS232 interfaces

Robert Dobkin

Abstract

New developments in RS232 interface design are described.

Keywords

RS232 interface

RS232 driver

RS232 receiver

New RS232 interface chips have been developed that offer significant advantages over older devices such as the 1488 and 1489. The new RS232 interface ICs improve speed, power, voltage supply requirements, and protection over older devices. Further, the new chips are easier to use, requiring fewer external components and may be turned off to a “zero” power supply current condition for use in battery-powered systems.

The new RS232 drivers are implemented in a monolithic bipolar technology. A unique output stage was designed that provides large output swings, ...

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