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本帖最後由 manpower 於 2013-7-4 21:02 編輯
Schmitt-trigger buffered inputs at the enable/clock lines of the ’S373 and ’S374 devices simplify system design
as ac and dc noise rejection is improved by typically 400 mV due to the input hysteresis. A buffered
output-control (OC) input can be used to place the eight outputs in either a normal logic state (high or low logic
levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines
significantly.
The D type flip-flops datasheet is as link address http://www.ti.com/lit/ds/symlink/sn74ls374.pdf |
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發表於 2013-3-27 22:08:56
