ST16C2550 Просмотр технического описания (PDF) - Exar Corporation
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производитель
ST16C2550 Datasheet PDF : 39 Pages
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xr
REV. 4.4.0
Pin Description
NAME
40-PDIP
PIN #
TXRDYB#
-
44-PLCC
PIN #
12
48-TQFP
PIN #
6
RXRDYB#
-
23
18
MODEM OR SERIAL I/O INTERFACE
TXA
11
13
7
RXA
10
11
5
RTSA#
32
36
33
CTSA#
36
40
38
DTRA#
33
37
34
DSRA#
37
41
39
CDA#
38
42
40
RIA#
39
43
41
OP2A#
31
35
32
TXB
12
14
8
RXB
9
10
4
RTSB#
24
27
22
ST16C2550
2.97V TO 5.5V DUART WITH 16-BYTE FIFO
TYPE
DESCRIPTION
O UART channel B Transmitter Ready (active low). The out-
put provides the TX FIFO/THR status for transmit channel
B. See Table 2. If it is not used, leave it unconnected.
O UART channel B Receiver Ready (active low). This out-
put provides the RX FIFO/RHR status for receive channel
B. See Table 2. If it is not used, leave it unconnected.
O UART channel A Transmit Data. If it is not used, leave it
unconnected.
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.
O UART channel A Request-to-Send (active low) or general
purpose output. If it is not used, leave it unconnected.
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.
O UART channel A Data-Terminal-Ready (active low) or
general purpose output. If it is not used, leave it uncon-
nected.
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. See MCR[3]. This output should not be
used as a general output else it will disturb the INTA out-
put functionality. If it is not used at all, leave it uncon-
nected.
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 output. If it is not used, leave it unconnected.
5
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