SN74LS221D datasheet(4/27 Pages) TI1

Part #	SN74LS221D

Description	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUT

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Manufacturer	TI1 [Texas Instruments]

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SN54221, SN54LS221, SN74221, SN74LS221

DUAL MONOSTABLE MULTIVIBRATORS

WITH SCHMITT TRIGGER INPUTS

SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004

4

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

schematics of inputs and outputs

VCC

Req

Input

VCC

100

Ω NOM

Output

EQUIVALENT OF EACH INPUT

TYPICAL OF ALL OUTPUTS

SN54/74221

SN54/74LS221

EQUIVALENT OF EACH INPUT

TYPICAL OF ALL OUTPUTS

VCC

Req

Input

VCC

Output

120

Ω NOM

A Input: Req = 4 kΩ NOM

B, CLR Input: Req = 2 kΩ NOM

A Input: Req = 25 kΩ NOM

B Input: Req = 15.4 kΩ NOM

CLR: Req = 12.5 kΩ NOM

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