xr16c2552ij Exar Corporation, xr16c2552ij Datasheet - Page 10

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

XR16C2552
2.97V TO 5.5V DUAL UART 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.
F
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
F
OPERATING SPEED
The 2552 divides the basic external clock by 16. The basic 16X clock provides table rates to support standard
and custom applications using the same system design. The Baud Rate Generator divides this 16X clock by
any divisor from 1 to 2
Customized Baud Rates can be achieved by selecting the proper divisor values for the MSB and LSB sections
of baud rate generator.
2.9
IGURE
IGURE
6. O
5. E
Programmable Baud Rate Generator
Figure
XTERNAL
PERATING
5) it can extend its operation up to 64 MHz (4Mbps serial data rate) at room temperature and
.
C
F
LOCK
REQUENCY
16
-1. The rate table is configured via the DLL and DLM internal register functions.
C
ONNECTION FOR
C
HART
80
70
60
50
40
30
Operating frequency for XR16C2552
with external clock and a 2K ohms
vcc
gnd
pull-up resistor on XTAL2 pin.
. R
External Clock
EQUIRES A
3.0
E
XTENDED
R1
2K
3.5 4.0
Suppy Voltage
VCC
10
2K
Figure
D
OHMS PULL
XTAL1
XTAL2
ATA
4.5
6.
R
5.0
ATE
5.5
-
UP RESISTOR ON
-40
25
85
o
o
o
C
C
C
XTAL2
xr
PIN TO INCREASE
REV. 1.0.0