1. Decimal synchronous up / down counter (Dual Clock)
2. Brief Description:
193 decimal to be synchronized preset up / down counter, a total of
54193/74193, 54LS193/74LS193 two line structure. Its main
To the electrical characteristics of typical values are as follows:
3.193's clear the end is asynchronous. When the clear side (CLEAR) is high
, Whether the clock terminal (C DOWN, C UP) state how to complete
Clearance.
193 preset is asynchronous. When placed in control side (LOAD) for low power
Normally, regardless of the clock (C DOWN, C UP) state how output
(QA-QD) can be preset into the data input (A-D) consistent
State.
193 count is synchronized by C DOWN, C UP also added to the 4
Achieved on a trigger. In the C DOWN, C UP QA-under rising
QD also change, thus eliminating the asynchronous counter counting spikes appear.
When the conduct count plus or minus count, respectively, or using C DOWN C UP, this
Another is high when the clock should.
When the count on the overflow, the carry output (CARRY) outputs a low
Level pulse width for the C UP LOW part of the low pulse; when
Count under the overflow, the displacement output (BORROW) outputs a low
Pulse width for the C DOWN LOW part of the low pulse.
When the BORROW and CARRY are connected to one of C
DOWN, C UP, can be cascaded.
4. Dislocation output (active low)
5. Carry output
6. By counting clock input (rising edge valid)
7. Plus count clock input
8. Asynchronous clear terminal
9. Parallel data input
10. Asynchronous Parallel control of terminal placement
(其实我也不知道对不对。。。)
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