ST16C2450IQ48(2003) Просмотр технического описания (PDF) - Exar Corporation
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ST16C2450IQ48 Datasheet PDF : 29 Pages
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ST16C2450
2.97V TO 5.5V DUART
áç
REV. 4.0.0
Pin Description
NAME
44-PLCC
PIN #
48-TQFP
PIN #
TYPE
DESCRIPTION
INTB
32
29
O UART channel B Interrupt output. 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 (default).
MODEM OR SERIAL I/O INTERFACE
TXA
13
7
O UART channel A Transmit Data. If it is not used, leave it unconnected.
RXA
11
5
I UART channel A 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.
RTSA#
36
33
O UART channel A Request-to-Send (active low) or general purpose out-
put. If it is not used, leave it unconnected.
CTSA#
40
38
I UART channel A 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.
DTRA#
37
34
O UART channel A Data-Terminal-Ready (active low) or general purpose
output. If it is not used, leave it unconnected.
DSRA#
41
39
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.
CDA#
42
40
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.
RIA#
43
41
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.
OP2A#
35
32
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.
TXB
14
8
O UART channel B Transmit Data. If it is not used, leave it unconnected.
RXB
10
4
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.
RTSB#
27
22
O UART channel B Request-to-Send (active low) or general purpose out-
put. If it is not used, leave it unconnected.
CTSB#
28
23
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.
DTRB#
38
35
O UART channel B Data-Terminal-Ready (active low) or general purpose
output. If it is not used, leave it unconnected.
4
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