參數(shù)資料
型號(hào): XR16L2551IL
廠商: Exar Corporation
文件頁數(shù): 3/49頁
文件大?。?/td> 0K
描述: IC UART FIFO 16B DUAL 32QFN
產(chǎn)品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標(biāo)準(zhǔn)包裝: 490
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:
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 32-QFN 裸露焊盤(5x5)
包裝: 托盤
XR16L2551
11
REV. 1.1.3
LOW VOLTAGE DUART WITH POWERSAVE
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,
fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100 ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins (see Figure 4), with an external 500 k
to 1 M
resistor across it. Alternatively, an external clock can be connected to the XTAL1 pin to clock the
internal baud rate generator for standard or custom rates. Typical oscillator connections are shown in Figure 4.
For further reading on oscillator circuit please see application note DAN108 on EXAR’s web site.
2.9
Programmable Baud Rate Generator
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 Figure 5) it can extend its operation up to 50 MHz (3.125Mbps serial data rate) at room temperature
and 5.0V.
FIGURE 4. TYPICAL OSCILLATOR CONNECTIONS
FIGURE 5. EXTERNAL CLOCK CONNECTION FOR EXTENDED DATA RATE
C1
22-47 pF
C2
22-47 pF
Y1
1.8432 MHz
to
24 MHz
R1
0-120
(Optional)
R2
500 K
- 1 M
XTAL1
XTAL2
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
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XR16L2551IM 制造商:EXAR 制造商全稱:EXAR 功能描述:LOW VOLTAGE DUART WITH POWERSAVE