74LS221N datasheet(4/7 Pages) MOTOROLA

Part #	74LS221N

Description	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS

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Manufacturer	MOTOROLA [Motorola, Inc]

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4 / 7 page

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FAST AND LS TTL DATA

SN54/74LS221

AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C)

Symbol

From

(Input)

To

(Output)

Limits

Unit

Test Conditions

Symbol

From

(Input)

To

(Output)

Min

Typ

Max

Unit

Test Conditions

tPLH

A

Q

45

70

ns

CL = 15 pF,

See Figure 1

Cext = 80 pF, Rext = 2.0 Ω

tPLH

B

Q

35

55

ns

CL = 15 pF,

See Figure 1

Cext = 80 pF, Rext = 2.0 Ω

tPHL

A

Q

50

80

ns

CL = 15 pF,

See Figure 1

Cext = 80 pF, Rext = 2.0 Ω

tPHL

B

Q

40

65

ns

CL = 15 pF,

See Figure 1

Cext = 80 pF, Rext = 2.0 Ω

tPHL

Clear

Q

35

55

ns

CL = 15 pF,

See Figure 1

tPLH

Clear

Q

44

65

ns

CL = 15 pF,

See Figure 1

tW(out)

A or B

Q or Q

70

120

150

ns

Cext = 80 pF, Rext = 2.0 Ω

tW(out)

A or B

Q or Q

20

47

70

ns

Cext = 0, Rext = 2.0 kΩ

tW(out)

A or B

Q or Q

600

670

750

Cext = 100 pF, Rext = 10 kΩ

6.0

6.9

7.5

ms

Cext = 1.0 µF, Rext = 10 kΩ

AC SETUP REQUIREMENTS (VCC = 5.0 V, TA = 25°C)

Symbol

Parameter

Limits

Unit

Symbol

Parameter

Min

Typ

Max

Unit

dv/dt

Rate of Rise or Fall of Input Pulse

dv/dt

Schmitt, B

1.0

V/s

dv/dt

Logic Input, A

1.0

V/

µs

tW

Input Pulse Width

tW

A or B, tW(in)

40

ns

tW

Clear, tW (clear)

40

ts

Clear-Inactive-State Setup Time

15

ns

Rext

External Timing Resistance

54

1.4

70

k

Ω

Rext

External Timing Resistance

74

1.4

100

k

Ω

Cext

External Timing Capacitance

0

1000

µF

Output Duty Cycle

RT = 2.0 k

Ω

50

%

RT = MAX Rext

90

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