SN54221, SN54LS221, SN74221, SN74LS221

DUAL MONOSTABLE MULTIVIBRATORS

WITH SCHMITT TRIGGER INPUTS

SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004

9

POST OFFICE BOX 655303

PARAMETER

FROM

TO

TEST CONDITIONS

SN54LS221

SN74LS221

UNIT

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

tPLH

A

Q

45

70

45

70

tPLH

B

Q

Cext = 80 pF,

Rext = 2 kΩ

35

55

35

55

ns

tPHL

A

Q

Cext = 80 pF,

Rext = 2 kΩ

50

80

50

80

ns

tPHL

B

Q

40

65

40

65

tPHL

CLR

Q

Cext = 80 pF,

Rext = 2 kΩ

35

55

35

55

ns

tPLH

CLR

Q

Cext = 80 pF,

Rext = 2 kΩ

44

65

44

65

ns

Cext = 80 pF,

Rext = 2 kΩ

70

120

150

70

120

150

tw

A or B

Q or Q

Cext = 0,

Rext = 2 kΩ

20

47

70

20

47

70

ns

tw

A or B

Q or Q

Cext = 100 pF, Rext = 10 kΩ

670

740

810

670

740

810

ns

Cext = 1 µF,

Rext = 10 kΩ

6*

6.9

7.5*

6

6.9

7.5

ms

∗ On products compliant to MIL-PRF-38535, this parameter is not production tested.