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SN54LS221J

Part #	SN54LS221J
Description	DUAL MONOSTABLE MULTIVIBRATOR
Category	IC
Availability	Out of Stock
Qty	0

Qty	Price
1 +	$7.32150

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Technical Document

DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

5-383

FAST AND LS TTL DATA

SN54/74LS221

AC CHARACTERISTICS (V

CC

= 5.0 V, T

A

= 25°C)

Symbol

From

(Input)

To

(Output)

Limits

Unit

Test Conditions

Symbol

From

(Input)

To

(Output)

Min Typ Max

Unit

Test Conditions

t

PLH

A Q 45 70

ns

C

L

= 15 pF,

See Figure 1

C

ext

= 80 pF, R

ext

= 2.0 Ω

t

PLH

B Q 35 55

ns

C

L

= 15 pF,

See Figure 1

C

ext

= 80 pF, R

ext

= 2.0 Ω

t

PHL

A Q 50 80

ns

C

L

= 15 pF,

See Figure 1

C

ext

= 80 pF, R

ext

= 2.0 Ω

t

PHL

B Q 40 65

ns

C

L

= 15 pF,

See Figure 1

C

ext

= 80 pF, R

ext

= 2.0 Ω

t

PHL

Clear Q 35 55 ns

C

L

= 15 pF,

See Figure 1

t

PLH

Clear Q 44 65 ns

C

L

= 15 pF,

See Figure 1

t

W(out)

A or B

Q or Q

70 120 150

ns

C

ext

= 80 pF, R

ext

= 2.0 Ω

t

W(out)

A or B

Q or Q

20 47 70

ns

C

ext

= 0, R

ext

= 2.0 kΩ

t

W(out)

A or B

Q or Q

600 670 750 C

ext

= 100 pF, R

ext

= 10 kΩ

6.0 6.9 7.5 ms C

ext

= 1.0 µF, R

ext

= 10 kΩ

AC SETUP REQUIREMENTS (V

CC

= 5.0 V, T

A

= 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

t

W

Input Pulse Width

t

W

A or B, t

W(in)

40 ns

t

W

Clear, t

W

(clear) 40

t

s

Clear-Inactive-State Setup Time 15 ns

R

ext

External Timing Resistance

54 1.4 70

kΩ

R

ext

External Timing Resistance

74 1.4 100

kΩ

C

ext

External Timing Capacitance 0 1000 µF

Output Duty Cycle

RT = 2.0 kΩ 50 %

R

T

= MAX R

ext

90

5-384

FAST AND LS TTL DATA

SN54/74LS221

AC WAVEFORMS

≥

≥

≥

≥

≥≥

TRIGGER FROM B, THEN CLEAR — CONDITION 1

TRIGGER FROM B, THEN CLEAR — CONDITION 2

CLEAR OVERRIDING B, THEN TRIGGER FROM B

TRIGGERING FROM POSITIVE TRANSITION OF CLEAR

Figure 1

5-385

FAST AND LS TTL DATA

°

°

°

°

1

8

916

-A-

-B-

P

D

-T-

K

C

G

M

R X 45°

F

J

Case 751B-03 D Suffix

16-Pin Plastic

SO-16

Case 648-08 N Suffix

16-Pin Plastic

°

°

°

°

-A-

B

1 8

916

F

H

G

D

S

C

-T-

K

J

M

L

Case 620-09 J Suffix

16-Pin Ceramic Dual In-Line

°

°

°

°

-B-

-A-

-T-

C

D

E

F G

J

K

M

N

L

16 9

1 8

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