參數(shù)資料
型號: XR88C681J-F
廠商: Exar Corporation
文件頁數(shù): 50/101頁
文件大?。?/td> 0K
描述: IC UART CMOS DUAL 44PLCC
標(biāo)準(zhǔn)包裝: 27
特點: *
通道數(shù): 2,DUART
FIFO's: 1 字節(jié),3 字節(jié)
電源電壓: 4.75 V ~ 5.25 V
帶并行端口:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 44-LCC(J 形引線)
供應(yīng)商設(shè)備封裝: 44-PLCC(16.59x16.59)
包裝: 管件
其它名稱: 1016-1329
XR88C681
52
Rev. 2.11
XR88C681
X1
X2
C1
C2
R1
R2
3.6864MHz
Parallel Resonant Crystal
C1: 10pF + (Stray < 5pF)
C2: 10pF + (Stray < 5pF)
R1: 100ohm
R2: 100ohm
Figure 25. A Recommended Schematic for the XTAL Oscillator Circuitry
Note:
The user also has an option to drive the Oscillator Circuit with a TTL input signal, in lieu of using a crystal oscillator. If this
approach is used, the TTL must be driven into the X1/CLK pin, and the X2 pin must be left floating.
If the user desires to run numerous DUARTs from a single crystal oscillator,
Figure 26 presents an approach and the
necessary circuitry to accomplish this objective.
X1
X2
XR88C681
Y1
74HC14
To X1 inputs of
other DUARTs
3.684MHz
Figure 26. A Recommended Schematic to Drive Multiple DUARTs From the Same Crystal Oscillator.
Note:
The user is urged not to use the 74LS14 Schmitt Trigger Inverter in lieu of the 74HC14 device. The input of the 74LS14 tends to
load down the oscillating signal from the DUART, to the point that the Schmitt Trigger inverter can no longer change state or
respond to the oscillator signal.
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