SN74LS221N datasheet(5/7 Pages) MOTOROLA

Part #	SN74LS221N

Description	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS

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Manufacturer	MOTOROLA [Motorola, Inc]

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FAST AND LS TTL DATA

SN54/74LS221

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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