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SN54HC257,SN54HC258,SN74HC257,

消耗积分:3 | 格式:rar | 大小:764 | 2010-08-11

韩刚龙

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These devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (G\) input is at a high logic level.

To ensure the high-impedance state during power up or power down, (G\) should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

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