xr16l2450im Exar Corporation, xr16l2450im Datasheet - Page 5

• Manufacturer Part Number: xr16l2450im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

xr
REV. 1.1.1
PIN DESCRIPTIONS
Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain.
ANCILLARY SIGNALS
RESET
OP2B#
XTAL1
XTAL2
N
GND
VCC
N.C.
AME
44-PLCC
1, 12, 23,
P
15
18
19
39
44
22
34
IN
#
24, 25, 31,
6, 12, 18,
48-TQFP
37, 43
P
13
14
36
42
17
IN
9
#
T
Pwr
Pwr
YPE
O
O
-
I
I
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. This output should not be used as a general output else it
will disturb the INTB output functionality. If it is not used, leave it uncon-
nected.
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.
2.25V to 5.5V power supply. All inputs are 5V tolerant.
Power supply common, ground.
No Connection. These pins are not connected internally.
5
D
ESCRIPTION
2.25V TO 5.5V DUART
XR16L2450