ST16C2450IJ44 Просмотр технического описания (PDF) - Exar Corporation

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ST16C2450IJ44

2.97V TO 5.5V DUART

Exar Corporation 

ST16C2450

2.97V TO 5.5V DUART

Pin Description

NAME

44-PLCC 48-TQFP

PIN #

PIN #

DTRA#

37

34

DSRA#

41

39

CDA#

42

40

RIA#

43

41

OP2A#

35

32

TXB

14

8

RXB

10

4

RTSB#

27

22

CTSB#

28

23

DTRB#

38

35

DSRB#

25

20

CDB#

21

16

RIB#

26

21

OP2B#

15

9

xr

REV. 4.0.1

TYPE

DESCRIPTION

O UART channel A Data-Terminal-Ready (active low) or general purpose

output. If it is not used, leave it unconnected.

I UART channel A 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 A 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 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 Output Port 2 Channel A - The output state is defined by the user and

through the software setting of MCR[3]. INTA is set to the active mode

and OP2A# output to a logic 0 when MCR[3] is set to a logic 1. INTA is

set to the three state mode and OP2A# to a logic 1 when MCR[3] is set

to a logic 0. This output should not be used as a general output else it

will disturb the INTA output functionality. If it is not used at all, leave it

unconnected.

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 condition. 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 out-

put. 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.

O Output Port 2 Channel B - The output state is defined by the user and

through the software setting of MCR[3]. INTB is set to the active mode

and OP2B# output to a logic 0 when MCR[3] is set to a logic 1. INTB is

set to the three state mode and OP2B# to a logic 1 when MCR[3] is set

to a logic 0. This output should not be used as a general output else it

will disturb the INTB output functionality. If it is not used, leave it uncon-

nected.

4

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