Philips Semiconductors
Product specification
Programmable communications interface (PCI)
SCN2651
DESCRIPTION
PIN CONFIGURATIONS
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.
D2
D3
1
2
3
4
5
28 D1
27 D0
26
RxD
GND
D4
V
CC
25 RxC
24 DTR
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.
D5
D6
6
7
8
9
23 RTS
22 DSR
DIP
D7
21 RESET
20 BRCLK
19 TxD
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.
TxC
A1 10
CE 11
18 TxEMT/DSCHG
17 CTS
A0 12
The PCI is constructed using Philips Semiconductors n-channel
silicon gate depletion load technology and is packaged in a 28-pin
DIP.
R/W 13
RxRDY 14
16 DCD
15 TxRDY
TOP VIEW
FEATURES
SD00049
• Synchronous operation
– 5- to 8-bit characters
OTHER FEATURES
– Single or double SYN operation
– Internal character synchronization
– Transparent or non-transparent mode
– Automatic SYN or DLE-SYN insertion
– SYN or DLE stripping
• Internal or external baud rate clock
• 16 internal rates – 50 to 19,200 baud
• Double buffered transmitter and receiver
• Full or half duplex operation
• TTL compatible inputs and outputs
• Single 5V power supply
– Odd, even, or no parity
– Local or remote maintenance loopback mode
– Baud rate: DC to 1Mbps (1X clock)
• Asynchronous operation
• No system clock required
– 5- to 8-bit characters
• 28-pin dual in-line package
– 1, 1-1/2 or 2 stop bits
– Odd, even, or no parity
APPLICATIONS
– Parity, overrun and framing error detection
– Line break detection and generation
– False start bit detection
• Intelligent terminals
• Network processors
– Automatic serial echo mode
– Local or remote maintenance loopback mode
• Front-end processors
• Remote data concentrators
• Computer to computer links
• Serial peripherals
– Baud rate: DC to 1Mbps
(1X clock)
DC to 62.5kbps (16X clock)
DC to 15.625kbps
(64X clock)
ORDERING CODE
PACKAGES
V
CC
= 5V +5%
Commercial
Industrial
DWG #
0°C to +70°C
-40°C to +85°C
28-Pin Plastic Dual In-Line Package (DIP)
SCN2651CC1N28
Not available
SOT117-2
1
1994 Apr 27
853-1067 12793
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