參數(shù)資料
型號(hào): XR16L2551ILTR-F
廠商: Exar Corporation
文件頁(yè)數(shù): 4/49頁(yè)
文件大?。?/td> 0K
描述: IC UART FIFO 16B DUAL 32QFN
標(biāo)準(zhǔn)包裝: 3,000
特點(diǎn): *
通道數(shù): 2,DUART
FIFO's: 16 字節(jié)
規(guī)程: RS232,RS485
電源電壓: 2.25 V ~ 5.5 V
帶自動(dòng)流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動(dòng)位檢測(cè)功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
安裝類(lèi)型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 32-QFN 裸露焊盤(pán)(5x5)
包裝: 帶卷 (TR)
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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