SN74LS221 データシートの表示（PDF） - ON Semiconductor

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SN74LS221

Dual Monostable Multivibrators with Schmitt−Trigger Inputs

ON Semiconductor 

SN74LS221

AC WAVEFORMS

tW(in)

B INPUT

1.3 V

3V

0V

≥60 ns

3V

CLEAR

tPLH

tPHL

0V

Q OUTPUT

VOH

VOL

Q OUTPUT

tPHL

tPLH

VOH

A INPUT IS LOW.

VOL

TRIGGER FROM B, THEN CLEAR — CONDITION 1

3V

B INPUT

0V

≥ 60 ns

3V

CLEAR

1.3 V

0V

VOH

Q OUTPUT

VOL

A INPUT IS LOW.

TRIGGER FROM B, THEN CLEAR — CONDITION 2

3V

B INPUT

≥ 50 ns

≥0

ts

0V

CLEAR

3V

0V

TRIGGERED

Q OUTPUT

VOH

VOL

NOT TRIGGERED

tW(out)

A INPUT IS LOW.

CLEAR OVERRIDING B, THEN TRIGGER FROM B

B INPUT

3V

0V

≥ 50 ns

≥ 50 ns

CLEAR

1.3 V

3V

0V

Q OUTPUT

VOH

VOL

A INPUT IS LOW.

TRIGGERING FROM POSITIVE TRANSITION OF CLEAR

Figure 1.

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