HD74LS191P 查看數據表（PDF） - Renesas Electronics

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HD74LS191P

Synchronous Up / Down 4-bit Binary Counter (single clock line)

Renesas Electronics 

HD74LS191

Waveforms 2

Load→Q, Data→Q

3V

Load

1.3V

1.3V

0V

Data

(A to D)

1.3V

3V

1.3V

0V

Output Q

1.3V

1.3V

1.3V

1.3V

VOH

VOL

tPLH

tPHL

tPLH

tPHL

Note: Conditions on other inputs are irrelevant.

Waveforms 3

G→Ripple CK, CK→Ripple CK, Down / Up→Ripple CK, Down / Up→Max / Min

3V

Load

0V

Down/Up

3V

1.3V

1.3V

0V

Clock

3V

1.3V

1.3V

0V

3V

G

tPHL

tPLH

0V

tPHL

tPLH

Ripple/Clock

1.3V 1.3V

1.3V 1.3V

tPLH

tPHL

VOH

VOL

Max/Min

1.3V

1.3V

VOH

VOL

Rev.2.00, Feb.18.2005, page 8 of 10

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