參數(shù)資料
型號: 20-101-0556
廠商: Rabbit Semiconductor
文件頁數(shù): 82/94頁
文件大?。?/td> 0K
描述: COMPUTER SNGL BD BL2000 IDC HDR
標(biāo)準(zhǔn)包裝: 1
系列: SBC
模塊/板類型: 單板計(jì)算機(jī)模塊
適用于相關(guān)產(chǎn)品: BL2000
User’s Manual
79
Transistors Q3 and Q4 are of opposite polarity so that a rail-to-rail voltage can be passed.
When the /CS1 voltage is low, Q4 will conduct. When the /CS1 voltage is high, Q3 con-
ducts. It takes time for the transistors to turn on, creating a propagation delay. This propa-
gation delay is typically very small, about 10 ns to 15 ns.
The signal that turns the transistors on is a high on the processor’s reset line, /RESET.
When the BL2000 is not in reset, the reset line will be high, turning on n-channel Q4
directly and p-channel FET Q3 by way of Q8. When the board is in reset both Q3 and Q4
are off, isolating /CSRAM and allowing it to be pulled to VRAM.
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