xr16l2550im Exar Corporation, xr16l2550im Datasheet - Page 10

• Manufacturer Part Number: xr16l2550im
• Description: Industry Smallest Package Uart With 2.25v To 5.5v Operation
• Manufacturer: Exar Corporation

XR16L2550
LOW VOLTAGE DUART WITH 16-BYTE FIFO
A single baud rate generator is provided for the transmitter and receiver, allowing independent TX/RX channel
control. The programmable Baud Rate Generator is capable of operating with a crystal frequency of up to 24
MHz. However, with an external clock input on XTAL1 pin and a 2K ohms pull-up resistor on XTAL2 pin (as
shown in
5.0V.
To obtain maximum data rate, it is necessary to use full rail swing on the clock input. See external clock
operating frequency over power supply voltage chart in
2.10
Programmable Baud Rate Generator
Figure
5) it can extend its operation up to 64 MHz (4Mbps serial data rate) at room temperature and
F
ON
IGURE
XTAL2
F
IGURE
80
70
60
50
40
30
6. O
Operating frequency for XR16L2550
vcc
gnd
with external clock and a 2K ohms
PIN TO INCREASE OPERATING SPEED
PERATING
pull-up resistor on XTAL2 pin.
5. E
External Clock
3.0
XTERNAL
3.5 4.0
F
R1
2K
Suppy Voltage
REQUENCY
VCC
10
C
Figure
LOCK
4.5
XTAL1
XTAL2
C
C
6.
HART
ONNECTION FOR
5.0
. R
5.5
EQUIRES A
-40
25
85
o
o
o
C
C
C
E
XTENDED
2K
OHMS PULL
D
ATA
-
R
UP RESISTOR
ATE
REV. 1.1.2