M54HC40102F1R(1993) Ver la hoja de datos (PDF) - STMicroelectronics

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M54HC40102F1R
(Rev.:1993)

8 STAGE PRESETTABLE SYNCHRONOUS DOWN COUNTERS

STMicroelectronics 

EXAMPLE OF TYPICAL APPLICATION

PROGRAMMABLE DIVIDE-BY-N COUNTER

M54/M74HC40102/40103

•

fOUT

=

fIN

N+

1

•Timing chart when N = ”3”

(J0, J1 = VCC, J2 – J7 = GND)

PARALLEL CARRY CASCADING

• HC40102... 1/2 to 1/100 are dividable

• HC40103... 1/2 to 1/256 are dividable

* At synchronous cascade connection, huzzerd occurs at C0 output after its second stage when digitplace changes, due to delay arrival. Therefore,

take gate from HC32 or the like, not from C0 output at the rear stage directly.

PROGRAMMABLE TIMER

Note :The above formula does not take into account the phase of clock input. Therefore, the real pulse width is the distance between the

above formula-1/fIN ∼ the above formula.

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