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SCC2691

Universal asynchronous receiver/transmitter (UART)

Philips Electronics 

Philips Semiconductors

Universal asynchronous receiver/transmitter (UART)

Product specification

SCC2691

ORDERING INFORMATION

PACKAGES

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

28-Pin Plastic Leaded Chip Carrier (PLCC) Package

24-Pin Plastic Small Outline Large (SOL) Package

BLOCK DIAGRAM

COMMERCIAL

VCC = +5V +10%,

TA = 0°C to +70°C

SCC2691AC1N24

SCC2691AC1A28

SCC2691AC1D24

INDUSTRIAL

VCC = +5V +10%,

TA = –40°C to +85°C

SCC2691AE1N24

SCC2691AE1A28

8

D0–D7

RDN

WRN

CEN

3

A0–A2

RESET

INTRN

INTERNAL DATA

BUS

BUS BUFFER

OPERATION CONTROL

ADDRESS

DECODE

R/W CONTROL

CONTROL

INTERRUPT CONTROL

IMR

ISR

CHANNEL A

TRANSMIT

HOLDING REG

TRANSMIT

SHIFT REGISTER

RECEIVE

HOLDING REG (3)

RECEIVE

SHIFT REGISTER

MR1, 2

CR

SR

X1/CLK

X2

TIMING

BAUD RATE

GENERATOR

CLOCK

SELECTORS

COUNTER/

TIMER

CRYSTAL

OSCILLATOR

POWER DOWN

LOGIC

CSR

ACR

CTUR

CTLR

TIMING

INPUT PIN

CHANGE OF

STATE

DETECTOR

OUTPUT PIN

FUNCTION

SELECT LOGIC

ACR

DWG #

SOT222–1

SOT261-3

SOT137-1

TxD

RxD

MPI

MPO

Figure 2. Block Diagram

VCC

GND

SD00123

1998 Sep 04

3

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