xr16c2550ip Exar Corporation, xr16c2550ip Datasheet - Page 4

• Manufacturer Part Number: xr16c2550ip
• Description: Dual Uart With 16-byte Transmit And Receive Fifos
• Manufacturer: Exar Corporation

Pin Description
XR16C2550
2.97V TO 5.5V DUART WITH 16-BYTE FIFO
MODEM OR SERIAL I/O INTERFACE
RXRDYB#
DSRA#
RTSA#
CTSA#
DTRA#
OP2A#
RTSB#
CTSB#
DTRB#
CDA#
N
RIA#
RXA
RXB
TXA
TXB
AME
40-PDIP
P
11
10
32
36
33
37
38
39
31
12
24
25
34
IN
9
-
#
44-PLCC
P
23
13
11
36
40
37
41
42
43
35
14
10
27
28
38
IN
#
48-TQFP
P
18
33
38
34
39
40
41
32
22
23
35
IN
7
5
8
4
#
T
YPE
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
UART channel B Receiver Ready (active low). This output provides
the RX FIFO/RHR status for receive channel B. See
not used, leave it unconnected.
UART channel A Transmit Data. If it is not used, leave it uncon-
nected.
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 pur-
pose output. If it is not used, leave it unconnected.
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 output function-
ality. If it is not used at all, leave it unconnected.
UART channel B Transmit Data. If it is not used, leave it uncon-
nected.
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.
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.
UART channel B Data-Terminal-Ready (active low) or general pur-
pose output. If it is not used, leave it unconnected.
4
D
ESCRIPTION
xr
Table
REV. 1.0.1
2. If it is