xr16c2552ij Exar Corporation, xr16c2552ij Datasheet - Page 5

• Manufacturer Part Number: xr16c2552ij
• Description: 2.97v To 5.5v Dual Uart With 16-byte Fifo
• Manufacturer: Exar Corporation

xr
REV. 1.0.0
Pin Description
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
ANCILLARY SIGNALS
DSRB#
RESET
RTSB#
CTSB#
DTRB#
XTAL1
XTAL2
CDB#
N
RIA#
RIB#
GND
VCC
RXB
TXB
AME
44-PLCC
44, 33
22, 12
P
43
26
25
23
28
27
29
30
31
11
13
21
IN
#
T
Pwr
Pwr
YPE
O
O
O
O
I
I
I
I
I
I
I
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.
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 condi-
tion. 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 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.
UART channel B 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.
Crystal or external clock input.
Crystal or buffered clock output.
Reset (active high) - A longer than 40 ns logic 1 pulse on this pin will reset the internal
registers and all outputs. The UART transmitter output will be held at logic 1, the
receiver input will be ignored and outputs are reset during reset period (see External
Reset Conditions).
3.3V to 5V power supply. All inputs are 5V tolerant.
Power supply common, ground.
5
2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO
D
ESCRIPTION
XR16C2552