XR16C2450 Datasheet, PDF (4/31 Pages) Exar Corporation – 2.97V TO 5.5V DUART

XR16C2450
2.97V TO 5.5V DUART
Pin Description
NAME
40-PDIP
PIN #
44-PLCC
PIN #
RTSA#
32
36
CTSA#
36
40
DTRA#
33
37
DSRA#
37
41
CDA#
38
42
RIA#
39
43
OP2A#
31
35
TXB
12
14
RXB
9
10
RTSB#
24
27
CTSB#
25
28
DTRB#
34
38
DSRB#
22
25
CDB#
19
21
48-TQFP
PIN #
33
38
34
39
40
41
32
8
4
22
23
35
20
16
xr
REV. 1.0.0
TYPE
DESCRIPTION
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. This output should not be used as a general out-
put 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 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 uncon-
nected.
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.
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