參數(shù)資料
型號(hào): XR16L2551IL
廠商: EXAR CORP
元件分類(lèi): 微控制器/微處理器
英文描述: LOW VOLTAGE DUART WITH POWERSAVE
中文描述: 2 CHANNEL(S), 3.125M bps, SERIAL COMM CONTROLLER, QCC32
封裝: 5 X 5 MM, 0.90 MM HEIGHT, QFN-32
文件頁(yè)數(shù): 12/48頁(yè)
文件大?。?/td> 287K
代理商: XR16L2551IL
XR16L2551
LOW VOLTAGE DUART WITH POWERSAVE
á
REV. 1.0.0
12
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
Figure 6
.
The L2551 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 the input 16X clock
by any divisor from 1 to 2
16
-1. The rate table is configured via the DLL and DLM internal register functions.
Customized Baud Rates can be achieved by selecting the proper divisor values for the MSB and LSB sections
of baud rate generator.
Table 6
shows the standard data rates available with a 14.7456 MHz crystal or external clock at 16X sampling
rate. When using a non-standard frequency crystal or external clock, the divisor value can be calculated for
DLL/DLM with the following equation.
F
IGURE
6. O
PERATING
F
REQUENCY
C
HART
. R
EQUIRES
A
2K
OHMS
PULL
-
UP
RESISTOR
ON
XTAL2
PIN
TO
INCREASE
OPERATING
SPEED
divisor (decimal) = (XTAL1 clock frequency) / (serial data rate x 16)
60
50
40
30
3.0
4.5
5.5
3.5 4.0
5.0
Suppy Voltage
X
70
80
85
o
C
25
o
C
-40
o
C
Operating frequency for XR16L2551
with external clock and a 2K ohms
pull-up resistor on XTAL2 pin.
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XR16L2551IM 制造商:EXAR 制造商全稱(chēng):EXAR 功能描述:LOW VOLTAGE DUART WITH POWERSAVE