Philips Semiconductors

Product specification

SCN2651

Programmable communications interface (PCI)

1

1994 Apr 27

853-1067 12793

DESCRIPTION

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 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 is constructed using Philips Semiconductors n-channel

silicon gate depletion load technology and is packaged in a 28-pin

DIP.

FEATURES

– 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)

– 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)

PIN CONFIGURATIONS

24

23

22

21

20

19

18

17

16

15

28

27

12

10

11

9

8

7

6

5

4

3

2

1

14

13

26

25

D1

D0

VCC

RxC

DTR

RTS

DSR

RESET

BRCLK

TxD

TxEMT/DSCHG

CTS

DCD

TxRDY

RxRDY

R/W

A0

CE

A1

TxC

D7

D6

D5

D4

GND

RxD

D3

D2

DIP

TOP VIEW

SD00049

OTHER FEATURES

APPLICATIONS

ORDERING CODE

PACKAGES

DWG #

PACKAGES

Commercial

0

°C to +70°C

Industrial

-40

°C to +85°C

DWG #

0

°C to +70°C

-40

°C to +85°C

28-Pin Plastic Dual In-Line Package (DIP)

SCN2651CC1N28

Not available

SOT117-2