HD74LS221 查看數據表（PDF） - Renesas Electronics

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HD74LS221

Dual Monostable Multivibrators

Renesas Electronics 

HD74LS221

Waveforms 5

Clear overriding B, then trigger from B.

tTLH

tTHL

3V

B Input

90% 90%

1.3V 1.3V

1.3V

10%

10%

0V

≥ 50ns

tsu

≥ 0ns

3V

CLR

1.3V

1.3V

0V

Triggered

Q

Not Triggered

1.3V 1.3V

tw (out)

VOH

VOL

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

Waveforms 6

Positive transition of Clear.

tTLH

tTHL

3V

B Input

90%

10% 1.3V

90%

1.3V 10%

0V

≥ 50ns

≥ 50ns

3V

CLR

1.3V

1.3V

0V

VOH

Q

VOL

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

Rev.3.00, Jul.15.2005, page 7 of 8

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