SN74LS221D datasheet(2/8 Pages) ONSEMI

Part #	SN74LS221D

Description	LOW POWER SCHOTTKY

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SN74LS221

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Positive logic: Low input to clear resets Q low and

Positive logic: Q high regardless of dc levels at A

Positive logic: or B inputs.

14

13

12

11

10

9

12345

6

7

16

15

8

VCC

1A

1 Rext/

Cext

1

Cext

1Q

2Q

2B

2

CLR

2A

1B

1

CLR

1Q

2Q

2

Cext

2 Rext/

Cext

GND

Q

CLR

Q

CLR

+

VCC

Rext

R/C

Cext

FUNCTION TABLE

(EACH MONOSTABLE)

INPUTS

OUTPUTS

CLEAR

A

B

Q

L

X

L

H

X

H

XL

H

X

LL

H

L

°

H

±

H

*

°

L

H

*See operational notes — Pulse Trigger Modes

TYPE

TYPICAL

POWER

MAXIMUM

OUTPUT PULSE

DISSIPATION

LENGTH

SN74LS221

23 mW

70 s

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SN74LS221D Datasheet(PDF) 2 Page - ON Semiconductor

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