ST16C2552 データシートの表示（PDF） - Exar Corporation

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ST16C2552

2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO

Exar Corporation 

REV. 4.2.2

Pin Description

NAME

RIA#

44-PLCC

PIN #

43

TXB

26

RXB

25

RTSB#

23

CTSB#

28

DTRB#

27

DSRB#

29

CDB#

30

RIB#

31

ANCILLARY SIGNALS

XTAL1

11

XTAL2

13

RESET

21

VCC

GND

44, 33

22, 12

ST16C2552

2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO

TYPE

DESCRIPTION

I UART channel A Ring-Indicator (active low) or general purpose input. This input

should be connected to VCC when not used. This input has no effect on the UART.

O UART channel B Transmit Data. If it is not used, leave it unconnected.

I UART channel B Receive Data. Normal receive data input must idle at logic 1 condi-

tion. If it is not used, tie it to VCC or pull it high via a 100k ohm resistor.

O UART channel B Request-to-Send (active low) or general purpose output. If it is not

used, leave it unconnected.

I UART channel B Clear-to-Send (active low) or general purpose input. This input

should be connected to VCC when not used. This input has no effect on the UART.

O UART channel B Data-Terminal-Ready (active low) or general purpose output. If it is

not used, leave it unconnected.

I UART channel B Data-Set-Ready (active low) or general purpose input. This input

should be connected to VCC when not used. This input has no effect on the UART.

I UART channel B Carrier-Detect (active low) or general purpose input. This input

should be connected to VCC when not used. This input has no effect on the UART.

I UART channel B Ring-Indicator (active low) or general purpose input. This input

should be connected to VCC when not used. This input has no effect on the UART.

I Crystal or external clock input.

O Crystal or buffered clock output.

I Reset (active high) - A longer than 40 ns logic 1 pulse on this pin will reset the internal

registers and all outputs. The UART transmitter output will be held at logic 1, the

receiver input will be ignored and outputs are reset during reset period (see External

Reset Conditions).

Pwr 3.3V to 5V power supply. All inputs are 5V tolerant for devices with top marking of

"A2 YYWW" and newer.

Pwr Power supply common, ground.

Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.

5

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