REV. 1.0.1 2.6 Crystal Oscillator or External Clock Input Th" />
參數(shù)資料
型號(hào): XR16M681IB25-F
廠商: Exar Corporation
文件頁數(shù): 2/51頁
文件大?。?/td> 0K
描述: IC UART FIFO 64B 25BGA
標(biāo)準(zhǔn)包裝: 714
特點(diǎn): *
通道數(shù): 1,UART
FIFO's: 64 字節(jié)
規(guī)程: RS232,RS422,RS485
電源電壓: 1.62 V ~ 3.63 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: 25-WFBGA
供應(yīng)商設(shè)備封裝: 25-BGA(3x3)
包裝: 托盤
其它名稱: 1016-1458
XR16M681IB25-F-ND
XR16M681
10
1.62V TO 3.63V UART WITH 32-BYTE FIFO AND VLIO INTERFACE
REV. 1.0.1
2.6
Crystal Oscillator or External Clock Input
The M681 includes an on-chip oscillator to produce a clock for the baud rate generators in the device when a
crystal is connected between XTAL1 and XTAL2 as show below. The CPU data bus does not require this clock
for bus operation. The crystal oscillator provides a system clock to the Baud Rate Generators (BRGs) in the
UART. XTAL1 is the input to the oscillator or external clock buffer input with XTAL2 pin being the output. For
FIGURE 6. TYPICAL CRYSTAL CONNECTIONS
C1
22-47pF
C2
22-47pF
Y1
1.8432 MHz
to
24 MHz
R1
0-120
(Optional)
R2
500K - 1M
XTAL1
XTAL2
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 100ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins. Typical oscillator connections are shown
in Figure 6. Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal baud rate
generator for standard or custom rates. The BGA package has XTAL1 only, the external clock is required. For
further reading on oscillator circuit, see application note DAN108 on EXAR’s web site.
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