SN74LS221N 查看數據表（PDF） - Motorola => Freescale

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SN74LS221N

DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS

Motorola => Freescale 

SN54 / 74LS221

AC WAVEFORMS

B INPUT

tW(in)

≥60 ns

1.3 V

CLEAR

Q OUTPUT

tPLH

tPHL

Q OUTPUT

tPHL

tPLH

A INPUT IS LOW.

TRIGGER FROM B, THEN CLEAR — CONDITION 1

B INPUT

CLEAR

≥ 60 ns

1.3 V

Q OUTPUT

A INPUT IS LOW.

TRIGGER FROM B, THEN CLEAR — CONDITION 2

B INPUT

CLEAR

≥ 50 ns

≥0

ts

TRIGGERED

Q OUTPUT

NOT TRIGGERED

tW(out)

A INPUT IS LOW.

CLEAR OVERRIDING B, THEN TRIGGER FROM B

B INPUT

CLEAR

≥ 50 ns

≥ 50 ns

1.3 V

Q OUTPUT

A INPUT IS LOW.

TRIGGERING FROM POSITIVE TRANSITION OF CLEAR

3V

0V

3V

0V

VOH

VOL

VOH

VOL

3V

0V

3V

0V

VOH

VOL

3V

0V

3V

0V

VOH

VOL

3V

0V

3V

0V

VOH

VOL

Figure 1

FAST AND LS TTL DATA

5-384

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