CDP1853AC

The CDP1854A/3 and CDP1854AC/3 are high reliability silicon gate CMOS Universal Asynchronous Receiver/Transmitter (UART) circuits. They are designed to provide the necessary formatting and control for interfacing between serial and parallel data. For example, these UARTs can be used to interface between a peripheral or terminal with serial I/O ports and the 8-bit CDP1800-series microprocessor parallel data bus system. The CDP1854A/3 is capable of full duplex operation, i.e., simultaneous conversion of serial input data to parallel output data and parallel input data to serial output data.

The CDP1854A/3 UART can be programmed to operate in one of two modes by using the mode control input. When the mode input is high (MODE = 1), the CDP1854A/3 is directly compatible with the CDP1800 series microprocessor system without additional interface circuitry. When the mode input is low (MODE = 0), the device is functionally compatible with industry standard UARTs such as the TR1602A and CDP6402. It is also pin compatible with these types, except that pin 2 is used for the mode control input.

The CDP1854A/3 and the CDP1854AC/3 are functionally identical. The CDP1854A/3 has a recommended operating voltage range of 4V to 10.5V, and the CDP1854AC/3 has a recommended operating voltage range of 4V to 6.5V.