HD74LS221 查看數據表（PDF） - Renesas Electronics

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HD74LS221

Dual Monostable Multivibrators

Renesas Electronics 

HD74LS221

Waveforms 3

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

tTLH

B Input

10%

90%

1.3V

≥ 60ns

CLR

tTHL

90%

10%

1.3V

Q

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

Waveforms 4

Trigger from A (B and clear input are high).

tTHL

A 90%

10%

10%

tTLH

90%

Q

1.3V

tw (out)

tw (out)

Q

1.3V

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

1.3V

1.3V

3V

0V

3V

0V

VOH

VOL

3V

0V

3V

0V

VOH

VOL

Rev.3.00, Jul.15.2005, page 6 of 8

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