参数资料
型号: XR16L2551IM-F
厂商: Exar Corporation
文件页数: 4/49页
文件大小: 0K
描述: IC UART FIFO 16B DUAL 48TQFP
标准包装: 250
特点: *
通道数: 2,DUART
FIFO's: 16 字节
规程: RS232,RS485
电源电压: 2.25 V ~ 5.5 V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 48-TQFP
供应商设备封装: 48-TQFP(7x7)
包装: 托盘
其它名称: XR16L2551IM-F-ND
XR16L2551
12
LOW VOLTAGE DUART WITH POWERSAVE
REV. 1.1.3
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 216 -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.
FIGURE 6. OPERATING FREQUENCY CHART. REQUIRES 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
XT
AL1
Ext
e
rna
lClock
F
requ
ency
in
MH
z.
70
80
85oC
25oC
-40oC
Operating frequency for XR16L2551
with external clock and a 2K ohms
pull-up resistor on XTAL2 pin.
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