SCN2651

Synchronous operation
¤ 5- to 8-bit characters
¤ Single or double SYN operation
¤ Internal character synchronization
¤ Transparent or non-transparent mode
¤ Automatic SYN or DLE-SYN insertion
¤ SYN or DLE stripping
¤ Odd, even, or no parity
¤ Local or remote maintenance loopback mode
¤ Baud rate: DC to 1Mbps (1X clock)
Asynchronous operation
¤ 5- to 8-bit characters
¤ 1, 1-1/2 or 2 stop bits
¤ Odd, even, or no parity
¤ Parity, overrun and framing error detection
¤ Line break detection  and generation
¤ False start bit detection
¤ Automatic serial echo mode
¤ Local or remote maintenance loopback mode
¤ Baud rate: DC to 1Mbps (1X clock) DC to 62.5kbps (16X clock) DC to 15.625kbps  (64X clock)
Internal or external baud rate clock
16 internal rates ¤C 50 to 19,200 bau
Double buffered transmitter and receiver
Full or half duplex operation
TTL compatible inputs and outputs
Single 5V power supply
No system clock required
28-pin dual in-line package

The Philips Semiconductors SCN2651 PCI is a universal synchronous/asynchronous data communications controller chip designed for microcomputer systems. It interfaces directly to the Philips Semiconductors SCN2650 microprocessor and may be used in a polled or interrupt driven system environment.  The SCN2651 accepts programmed instructions from the microprocessor and supports many serial data communication disciplines, synchronous and asynchronous, in the full or half-duplex mode.

The PCI SCN2651 serializes parallel data characters received from the microprocessor for transmission.  Simultaneously, it can receive serial data and convert it into parallel data characters for input to the microcomputer.

The SCN2651 contains a baud rate generator which can be programmed to either accept an external clock or to generate internal transmit or receive clocks.  Sixteen different baud rates can be selected under program control when operating in the internal clock mode.

The PCI SCN2651 is constructed using Philips Semiconductors n-channel silicon gate depletion load technology and is packaged in a 28-pin DIP.