HD74LS221 查看數據表（PDF） - Renesas Electronics

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HD74LS221

Dual Monostable Multivibrators

Renesas Electronics 

HD74LS221

Waveforms 1

Trigger from B, then clear (A input is low).

tTLH

tw (in)

tTHL

B Input

90%

10% 1.3V

90%

1.3V 10%

≥ 60ns

CLR

1.3V

tPLH

tPHL

Q

1.3V

tPHL

tPLH

Q

1.3V

Note: Input pulse: tTLH ≤ 15 ns, tTHL ≤ 6 ns, PRR = 1 MHz

1.3V

1.3V

Waveforms 2

Trigger from A, then clear (B input is high).

tTHL

tw (in)

tTLH

A

90%

1.3V

10%

90%

1.3V

10%

≥ 60ns

CLR

1.3V

tPLH

tPHL

Q

1.3V

1.3V

tPLH

Q

1.3V

tPHL

Note: Input pulse: tTLH ≤ 15 ns, tTHL ≤ 6 ns, PRR = 1 MHz

1.3V

3V

0V

3V

0V

3V

0V

VOH

VOL

3V

0V

3V

0V

VOH

VOL

VOH

VOL

Rev.3.00, Jul.15.2005, page 5 of 8

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