74LS221N datasheet(6/8 Pages) ONSEMI

Part #	74LS221N

Description	LOW POWER SCHOTTKY

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SN74LS221

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6

AC WAVEFORMS

B INPUT

CLEAR

Q OUTPUT

A INPUT IS LOW.

B INPUT

CLEAR

Q OUTPUT

A INPUT IS LOW.

B INPUT

CLEAR

Q OUTPUT

A INPUT IS LOW.

tW(in)

≥60 ns

tPLH

tPHL

tPLH

tPHL

1.3 V

3 V

0 V

3 V

0 V

VOH

VOL

VOH

VOL

≥60 ns

1.3 V

3 V

0 V

3 V

0 V

VOH

VOL

≥ 50 ns

≥ 0

ts

3 V

0 V

3 V

0 V

VOH

VOL

3 V

0 V

3 V

0 V

VOH

VOL

TRIGGERED

NOT TRIGGERED

≥50 ns

B INPUT

CLEAR

Q OUTPUT

A INPUT IS LOW.

tW(out)

TRIGGER FROM B, THEN CLEAR — CONDITION 1

TRIGGER FROM B, THEN CLEAR — CONDITION 2

CLEAR OVERRIDING B, THEN TRIGGER FROM B

TRIGGERING FROM POSITIVE TRANSITION OF CLEAR

Figure 1.

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74LS221N Datasheet(PDF) 6 Page - ON Semiconductor

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