74HCT4518 查看數據表（PDF） - Philips Electronics

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74HCT4518

Dual synchronous BCD counter

Philips Electronics 

Philips Semiconductors

Dual synchronous BCD counter

AC WAVEFORMS

Product specification

74HC/HCT4518

(1) HC : VM = 50%; VI = GND to VCC.

HCT: VM = 1.3 V; VI = GND to 3 V.

Fig.7 Waveforms showing hold and set-up times for nCP0 to nCP1 and nCP1 to nCP0.

Conditions:

nCP1 = HIGH while nCP0 is triggered on a

LOW-to-HIGH transition and nCP0 = LOW,

while nCP1 is triggered on a HIGH-to-LOW transition.

(1) HC : VM = 50%; VI = GND to VCC.

HCT: VM = 1.3 V; VI = GND to 3 V.

Fig.8 Waveforms showing the minimum pulse widths for nCP0, nCP1 and nMR inputs; the removal time for nMR

and the propagation delay for nMR to nQn outputs and the maximum clock pulse frequency.

Conditions:

nCP1 = HIGH while nCP0 is triggered on a

LOW-to-HIGH transition and nCP0 = LOW,

while nCP1 is triggered on a HIGH-to-LOW transition.

(1) HC : VM = 50%; VI = GND to VCC.

HCT: VM = 1.3 V; VI = GND to 3 V.

Fig.9 Waveforms showing the propagation delays for nCP0, nCP1 to nQn outputs and the output transition times.

PACKAGE OUTLINES

See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.

December 1990

7

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