Fairchild 74F20 service manual

April 1988
Revised July 1999

74F20
Dual 4-Input NAND Gate

General Description

This device contains two independent gates, each of which
performs the logic NAND function.

Ordering Code:

Order Number Package Number Package Description

74F20SC M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
74F20SJ M14D 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F20PC N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X ” to the ordering code.

74F20 Dual 4-Input NAND Gate

Logic Symbol

IEEE/IEC

Unit Loading/Fan Out

Pin Names Description

An, Bn, Cn, DnInputs 1.0/1.0 20 µA/−0.6 mA
O

n

Connection Diagram

U.L.

HIGH/LOW

Outputs 50/33.3 −1 mA/20 mA

Input I

Output I

IH/IIL

OH/IOL

© 1999 Fairchild Semiconductor Corporation DS009462 www.fairchildsemi.com

Absolute Maximum Ratings(Note 1) Recommended Operating

74F20

Storage Temperature −65°C to +150°C
Ambient Temperature under Bias −55°C to +125°C
Junction Temperature under Bias −55°C to +150°C
V

Pin Potential to Ground Pin −0.5V to +7.0V

CC

Input Voltage (Note 2) −0.5V to +7.0V
Input Current (Note 2) −30 mA to +5.0 mA
Voltage Applied to Output

in HIGH State (with V

CC

= 0V)
Standard Output −0.5V to V
3-STATE Output −0.5V to +5.5V

Current Applied to Output

in LOW State (Max) twice the rated I

OL

Conditions

Free Air Ambient Temperature 0°C to +70°C
Supply Voltage +4.5V to +5.5V

Note 1: Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation

CC

under these conditions is not implied.
Note 2: Either v oltage limit or current limit is sufficient to protect inputs.

(mA)

DC Electrical Characteristics

Symbol Parameter Min Typ Max Units

V
V
V
V

V

I

I

I

V

I

I
I
I
I

IH
IL
CD
OH

OL

IH

BVI

CEX

ID

OD

IL
OS
CCH
CCL

Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
Input LOW Voltage 0.8 V Recognized as a LOW Signal
Input Clamp Diode Voltage −1.2 V Min IIN = −18 mA
Output HIGH 10% V
Voltage 5% V
Output LOW 10% V
Voltage
Input HIGH
Current
Input HIGH Current
Breakdown Test
Output HIGH
Leakage Current
Input Leakage
Test All other pins grounded
Output Leakage
Circuit Current All other pins grounded
Input LOW Current −0.6 mA Max VIN = 0.5V
Output Short-Circuit Current −60 −150 mA Max V
Power Supply Current 0.9 1.4 mA Max VO = HIGH
Power Supply Current 3.4 5.1 mA Max VO = LOW

2.5 V Min IOH = −1 mA

CC

2.7 IOH = −1 mA

CC
CC

4.75 V 0.0

0.5 V Min IOL = 20 mA

5.0 µAMaxVIN = 2.7V

7.0 µAMaxVIN = 7.0V

50 µAMaxV

3.75 µA0.0

AC Electrical Characteristics

Symbol Parameter

t

PLH

t

PHL

Propagation Delay 2.4 3.7 5.0 2.0 7.0 2.4 6.0
An, Bn, Cn, Dn to On

TA = +25°CT

VCC = +5.0V VCC = +5.0V VCC = +5.0V

CL = 50 pF CL = 50 pF CL = 50 pF

Min Typ Max Min Max Min Max

1.5 3.2 4.3 1.5 6.5 1.5 5.3

= −55° to +125°CTA = 0°C to +70°C

A

V

CC

= V

OUT

IID = 1.9 µA

V

= 150 mV

IOD

= 0V

OUT

Conditions

CC

Units

ns

www.fairchildsemi.com 2