Product Summary

The P8274 is a multi-protocol serial controller. It is designed to interface high speed communications lines using asynchronous, IBM Bisync, and SDLC/HDLC protocol to interl microcomputer systems. The P8274 can be interfaced with inter’s MCS-48, -85, -51; iAPX-86, -88, -186 and -188 families, the 8237 DMA controller, or the 8089 I/O processor in polled, interrupt driven, or DMA driven modes of operation.

Parametrics

P8274 absolute maximum ratings: (1)ambient temperature under bias:0℃ to +70℃; (2)storage temperature: ceramic package:-65℃ to +150℃, plastic package:-40℃ to +125℃; (3)voltage on any pin with respect to ground:-0.5V to +7.0V.

Features

P8274 features: (1)asynchronous, byte synchronous and bit synchronous operation; (2)two independent full duplex transmitters and receivers; (3)full compatible with 8048, 8051, 8085, 8088, 8086, 80188 and 80186 CPU’s 8257 and 8237 DMA controllers, and 8089 I/O proc; (4)4 independent DMA channels; (5)baud rate: DC to 880K baud; (6)5bit to 8bit character, odd, even, or No parity, 1, 1.5 or 2 stop bits; (7)error detection: framing, overrun, and parity; (8)character synchronization, int. or ext.; (9)one or two sync characters; (10)automatic CRC generation and checking; (11)IBM blsync compatible; (12)SDLC/HDLC flag generation and recognition; (13)8 bit address recognition; (14)automatic zero bit insertion and deletion; (15)automatic CRC generation and checking; (16)CCITT X.25 compatible; (17)available in EXPRESS and military.

Diagrams

P8274 block diagram