xr16l2552im Exar Corporation, xr16l2552im Datasheet - Page 4

• Manufacturer Part Number: xr16l2552im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

XR16L2552
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
Pin Description
MODEM OR SERIAL I/O INTERFACE
RXRDYB#
DSRA#
DSRB#
RTSA#
CTSA#
DTRA#
RTSB#
CTSB#
DTRB#
CDA#
CDB#
N
RIA#
RXA
RXB
TXA
TXB
AME
48-TQFP
P
35
36
33
38
34
39
40
41
22
21
18
24
23
25
26
IN
8
#
44-PLCC
P
38
39
36
40
37
41
42
43
26
25
23
28
27
29
30
IN
-
#
T
YPE
O
O
O
O
O
O
O
I
I
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. This pin is only available on the 48-
pin TQFP package. If it is not used, leave it unconnected.
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.
This output must be asserted prior to using auto RTS flow control, see EFR[6],
MCR[1] and IER[6]. If it is not used, leave it unconnected.
UART channel A Clear-to-Send (active low) or general purpose input. It can
be used for auto CTS flow control, see EFR[7] and IER[7]. This input should
be connected to VCC when not used.
UART channel A Data-Terminal-Ready (active low) or general purpose 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.
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.
This output must be asserted prior to using auto RTS flow control, see EFR[6],
MCR[1] and IER[6]. If it is not used, leave it unconnected.
UART channel B Clear-to-Send (active low) or general purpose input. It can
be used for auto CTS flow control, see EFR[7] and IER[7]. This input should
be connected to VCC when not used.
UART channel B Data-Terminal-Ready (active low) or general purpose output.
If it is not used, leave it unconnected.
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.
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.
4
D
ESCRIPTION
xr
REV. 1.1.1