SN54221, SN54LS221, SN74221, SN74LS221

DUAL MONOSTABLE MULTIVIBRATORS

WITH SCHMITT TRIGGER INPUTS

SDLS213B − DECEMBER 1983 − REVISED NOVEMBER 2004

7

POST OFFICE BOX 655303

PARAMETER

FROM

TO

TEST CONDITIONS

SN54221

SN74221

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

27

27

ns

tPLH

CLR

Q

Cext = 80 pF,

Rext = 2 kΩ

40

40

ns

Cext = 80 pF,

Rext = 2 kΩ

70

110

150

70

110

150

tw

A or B

Q or Q

Cext = 0,

Rext = 2 kΩ

17

30

50

17

30

50

ns

tw

A or B

Q or Q

Cext = 100 pF, Rext = 10 kΩ

650

700

750

650

700

750

ns

Cext = 1 µF,

Rext = 10 kΩ

6.5*

7

7.5*

6.5

7

7.5

ms

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

recommended operating conditions (see Note 4)

SN54LS221

SN74LS221

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

4.75

5

5.25

V

IOH

High-level output current

−400

−400

µA

IOL

Low-level output current

4

8

mA

∆v/∆t

Rise or fall of input pulse rate

B input

1*

1

V/s

∆v/∆t

Rise or fall of input pulse rate

A input

1*

1

V/

µs

TA

Operating free-air temperature

−55

125

0

70

°C

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

NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.