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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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