SN74LS221D datasheet(4/7 Pages) MOTOROLA

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FAST AND LS TTL DATA

SN54/74LS221

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

Symbol

From

(Input)

(Output)

Limits

Unit

Test Conditions

Symbol

From

(Input)

(Output)

Min

Typ

Max

Unit

Test Conditions

tPLH

CL = 15 pF,

See Figure 1

Cext = 80 pF, Rext = 2.0 Ω

tPLH

CL = 15 pF,

See Figure 1

Cext = 80 pF, Rext = 2.0 Ω

tPHL

CL = 15 pF,

See Figure 1

Cext = 80 pF, Rext = 2.0 Ω

tPHL

CL = 15 pF,

See Figure 1

Cext = 80 pF, Rext = 2.0 Ω

tPHL

Clear

CL = 15 pF,

See Figure 1

tPLH

Clear

CL = 15 pF,

See Figure 1

tW(out)

A or B

Q or Q

120

150

Cext = 80 pF, Rext = 2.0 Ω

tW(out)

A or B

Q or Q

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

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

µs

Input Pulse Width

A or B, tW(in)

Clear, tW (clear)

Clear-Inactive-State Setup Time

Rext

External Timing Resistance

1.4

Ω

Rext

External Timing Resistance

1.4

100

Ω

Cext

External Timing Capacitance

1000

µF

Output Duty Cycle

RT = 2.0 k

Ω

RT = MAX Rext

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