xr16c2550ip Exar Corporation, xr16c2550ip Datasheet - Page 5

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

Pin Description
xr
REV. 1.0.1
N
ANCILLARY SIGNALS
OTE
DSRB#
RESET
OP2B#
XTAL1
XTAL2
CDB#
N
RIB#
GND
VCC
N.C.
AME
: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain.
40-PDIP
P
22
19
23
13
16
17
35
40
20
IN
-
#
44-PLCC
P
25
21
26
15
18
19
39
44
22
IN
-
#
48-TQFP
12, 24,
25, 37
P
20
16
21
13
14
36
42
17
IN
9
#
T
Pwr 2.97V to 5.5V power supply. All inputs are 5V tolerant.
Pwr Power supply common, ground.
YPE
O
O
I
I
I
I
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.
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.
Output Port 2 Channel B - The output state is defined by the user
and through the software setting of MCR[3]. INTB is set to the active
mode and OP2B# output to a logic 0 when MCR[3] is set to a logic
1. INTB is set to the three state mode and OP2B# 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 INTB output function-
ality. If it is not used, leave it unconnected.
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 Condi-
tions).
No Connection.
5
2.97V TO 5.5V DUART WITH 16-BYTE FIFO
D
ESCRIPTION
XR16C2550