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1/8

April 2001

s

HIGH SPEED: t

PD

 = 4ns (TYP.) at V

CC

 = 5V

s

LOW POWER DISSIPATION:

I

CC

 = 2

µ

A(MAX.) at T

A

=25°C

s

HIGH NOISE IMMUNITY:

V

NIH

 = V

NIL

 = 28 % V

CC

 (MIN.)

s

50

 TRANSMISSION LINE DRIVING 

CAPABILITY

s

SYMMETRICAL OUTPUT IMPEDANCE:

|I

OH

| = I

OL

 = 24mA (MIN)

s

BALANCED PROPAGATION DELAYS:

t

PLH

 

 t

PHL

 

s

OPERATING VOLTAGE RANGE:

V

CC

 (OPR) = 2V to 6V

s

PIN AND FUNCTION COMPATIBLE WITH 

74 SERIES 20

s

IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The 74AC20 is an advanced high-speed CMOS

DUAL 4-INPUT NAND GATE fabricated with

sub-micron silicon gate and double-layer metal

wiring C

2

MOS tecnology. 

The internal circuit is composed of 3 stages

including buffer output, which enables high noise

immunity and stable output.

All inputs and outputs are equipped with

protection circuits against static discharge, giving

them 2KV ESD immunity and transient excess

voltage.

74AC20

DUAL 4-INPUT NAND GATE

  

PIN CONNECTION AND IEC LOGIC SYMBOLS

ORDER CODES   

PACKAGE

TUBE

T & R

DIP

74AC20B

SOP

74AC20M

74AC20MTR

TSSOP

74AC20TTR

TSSOP

DIP

SOP

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74AC20

2/8

INPUT AND OUTPUT EQUIVALENT CIRCUIT    

PIN DESCRIPTION      

TRUTH TABLE    

X : Don’t Care

ABSOLUTE MAXIMUM RATINGS      

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is 

not implied.

RECOMMENDED OPERATING CONDITIONS   

1) V

IN

 from 30% to 70% of V

CC

PIN No

SYMBOL

NAME AND FUNCTION

1, 9

1A to 2A

Data Inputs

2, 10

1B to 2B

Data Inputs

3, 11

N.C.

Not Connected

4, 12

1C to 2C

Data Inputs

5, 13

1D to 2D

Data Inputs

6, 8

1Y to 2Y

Data Outputs

7

GND

Ground (0V)

14

V

CC

Positive Supply Voltage

A

B

C

D

Y

L

X

X

X

H

X

L

X

X

H

X

X

L

X

H

X

X

X

L

H

H

H

H

H

L

Symbol

Parameter

Value

Unit

V

CC

Supply Voltage

-0.5 to +7

V

V

I

DC Input Voltage

-0.5 to V

CC

 + 0.5

V

V

O

DC Output Voltage

-0.5 to V

CC

 + 0.5

V

I

IK

DC Input Diode Current

±

 20

mA

I

OK

DC Output Diode Current

±

 20

mA

I

O

DC Output Current

±

 50

mA

I

CC

 or I

GND

DC V

CC

 or Ground Current

±

 100

mA

T

stg

Storage Temperature

-65 to +150

°C

T

L

Lead Temperature (10 sec)

300

°C

Symbol

Parameter

Value

Unit

V

CC

Supply Voltage

2 to 6

V

V

I

Input Voltage

0 to V

CC

V

V

O

Output Voltage

0 to V

CC

V

T

op

Operating Temperature

-55 to 125

°C

dt/dv

Input Rise and Fall Time V

CC

 = 3.0, 4.5 or 5.5V (note 1)

8

ns/V

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74AC20

3/8

DC SPECIFICATIONS    

1) Maximum test duration 2ms, one output loaded at time

2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50

AC ELECTRICAL CHARACTERISTICS (C

L

 = 50 pF, R

L

 = 500 

, Input t

r

 = t

f

 = 3ns)  

(*) Voltage range is 3.3V 

±

 

0.3V

(**) Voltage range is 5.0V 

±

 

0.5V

Symbol

Parameter

Test Condition

Value

Unit

V

CC

(V)

T

A

 = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

V

IH

High Level Input 

Voltage

3.0

V

O

 = 0.1 V or 

V

CC

-0.1V

2.1

1.5

2.1

2.1

V

4.5

3.15

2.25

3.15

3.15

5.5

3.85

2.75

3.85

3.85

V

IL

Low Level Input 

Voltage

3.0

V

O

 = 0.1 V or 

V

CC

-0.1V

1.5

0.9

0.9

0.9

V

4.5

2.25

1.35

1.35

1.35

5.5

2.75

1.65

1.65

1.65

V

OH

High Level Output 

Voltage

3.0

I

O

=-50 

µ

A

2.9

2.99

2.9

2.9

V

4.5

I

O

=-50 

µ

A

4.4

4.49

4.4

4.4

5.5

I

O

=-50 

µ

A

5.4

5.49

5.4

5.4

3.0

I

O

=-12 mA

2.56

2.46

2.4

4.5

I

O

=-24 mA

3.86

3.76

3.7

5.5

I

O

=-24 mA

4.86

4.76

4.7

V

OL

Low Level Output 

Voltage

3.0

I

O

=50 

µ

A

0.002

0.1

0.1

0.1

V

4.5

I

O

=50 

µ

A

0.001

0.1

0.1

0.1

5.5

I

O

=50 

µ

A

0.001

0.1

0.1

0.1

3.0

I

O

=12 mA

0.36

0.44

0.5

4.5

I

O

=24 mA

0.36

0.44

0.5

5.5

I

O

=24 mA

0.36

0.44

0.5

I

I

Input Leakage 

Current

5.5

V

I

 = V

CC

 or GND

±

 0.1

±

 1

±

 1

µ

A

I

CC

Quiescent Supply 

Current

5.5

V

I

 = V

CC

 or GND

2

20

40

µ

A

I

OLD

Dynamic Output 

Current (note 1, 2)

5.5

V

OLD

 = 1.65 V max

75

50

mA

I

OHD

V

OHD

 = 3.85 V min

-75

-50

mA

Symbol

Parameter

Test Condition

Value

Unit

V

CC

(V)

T

A

 = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

t

PLH

 t

PHL

Propagation Delay 

Time

3.3

(*)

1.5

5.0

8.5

1.0

10.0

1.0

11.0

ns

5.0

(**)

1.5

4.0

7.0

1.0

9.0

1.0

10.5

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74AC20

4/8

CAPACITIVE CHARACTERISTICS   

1) C

PD

 is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without 

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I

CC(opr)

 = C

PD

 x V

CC

 x f

IN

 + I

CC

/2 (per gate)

TEST CIRCUIT   

C

L

 = 50pF or equivalent (includes jig and probe capacitance)

R

L

 = R

1

 = 500

 or equivalent

R

T

 = Z

OUT

 of pulse generator (typically 50

)

WAVEFORM: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)                

Symbol

Parameter

Test Condition

Value

Unit

V

CC

(V)

T

A

 = 25°C

-40 to 85°C

-55 to 125°C

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

C

IN

Input Capacitance

5.0

4

pF

C

PD

Power Dissipation 

Capacitance

(note 1)

5.0

f

IN

 = 10MHz

33

pF

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74AC20

5/8

DIM.

mm

inch

MIN.

TYP.

MAX.

MIN.

TYP.

MAX.

a1

0.51

0.020

B

1.39

1.65

0.055

0.065

b

0.5

0.020

b1

0.25

0.010

D

20

0.787

E

8.5

0.335

e

2.54

0.100

e3

15.24

0.600

F

7.1

0.280

I

5.1

0.201

L

3.3

0.130

Z

1.27

2.54

0.050

0.100

P001A

Plastic DIP-14 MECHANICAL DATA

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74AC20

6/8

DIM.

mm

inch

MIN.

TYP.

MAX.

MIN.

TYP.

MAX.

A

1.75

0.068

a1

0.1

0.2

0.003

0.007

a2

1.65

0.064

b

0.35

0.46

0.013

0.018

b1

0.19

0.25

0.007

0.010

C

0.5

0.019

c1

45 (typ.)

D

8.55

8.75

0.336

0.344

E

5.8

6.2

0.228

0.244

e

1.27

0.050

e3

7.62

0.300

F

3.8

4.0

0.149

0.157

G

4.6

5.3

0.181

0.208

L

0.5

1.27

0.019

0.050

M

0.68

0.026

S

8  (max.)

P013G

SO-14 MECHANICAL DATA

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74AC20

7/8

DIM.

mm

inch

MIN.

TYP.

MAX.

MIN.

TYP.

MAX.

A

1.1

0.433

A1

0.05

0.10

0.15

0.002

0.004

0.006

A2

0.85

0.9

0.95

0.335

0.354

0.374

b

0.19

0.30

0.0075

0.0118

c

0.09

0.20

0.0035

0.0079

D

4.9

5

5.1

0.193

0.197

0.201

E

6.25

6.4

6.5

0.246

0.252

0.256

E1

4.3

4.4

4.48

0.169

0.173

0.176

e

0.65 BSC

0.0256 BSC

K

0

o

4

o

8

o

0

o

4

o

8

o

L

0.50

0.60

0.70

0.020

0.024

0.028

c

E

b

A2

A

E1

D

1

PIN 1 IDENTIFICATION

A1

L

K

e

TSSOP14 MECHANICAL DATA

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74AC20

8/8

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