ST16C2550CQ48 EXAR [Exar Corporation], ST16C2550CQ48 Datasheet - Page 5

• Manufacturer Part Number: ST16C2550CQ48
• Description: 2.97V TO 5.5V DUART WITH 16-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

xr
REV. 4.4.0
Pin Description
MODEM OR SERIAL I/O INTERFACE
RXRDYB#
TXRDYB#
DSRA#
RTSA#
CTSA#
DTRA#
OP2A#
RTSB#
CDA#
N
RIA#
RXA
RXB
TXA
TXB
AME
40-PDIP
P
11
10
32
36
33
37
38
39
31
12
24
IN
9
-
-
#
44-PLCC
P
12
23
13
36
40
37
41
42
43
35
14
10
27
IN
11
#
48-TQFP
P
18
33
38
34
39
40
41
32
22
IN
6
7
5
8
4
#
T
YPE
O
O
O
O
O
O
O
O
I
I
I
I
I
I
5
UART channel B Transmitter Ready (active low). The out-
put provides the TX FIFO/THR status for transmit channel
B. See
UART channel B Receiver Ready (active low). This out-
put provides the RX FIFO/RHR status for receive channel
B. See
UART channel A Transmit Data. If it is not used, leave it
unconnected.
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.
UART channel A Request-to-Send (active low) or general
purpose output. If it is not used, leave it unconnected.
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.
UART channel A Data-Terminal-Ready (active low) or
general purpose output. If it is not used, leave it uncon-
nected.
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.
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.
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.
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.
UART channel B Transmit Data. If it is not used, leave it
unconnected.
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.
UART channel B Request-to-Send (active low) or general
purpose output. If it is not used, leave it unconnected.
2.97V TO 5.5V DUART WITH 16-BYTE FIFO
Table
Table
2. If it is not used, leave it unconnected.
2. If it is not used, leave it unconnected.
D
ESCRIPTION
ST16C2550