Fairchild DM7420 service manual
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DM7420
Dual 4-Input NAND Gate
General Description
This device contain s two in depen dent ga tes each of w hich
performs the logic NAND function.
Ordering Code:
Order Number Package Number Package Description
DM7420N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagram Function Table
August 1986
Revised February 2000
Y = ABCD
Inputs Output
ABCDY
XXXLH
XXLXH
XLXXH
LXXXH
HHHHL
H = HIGH Logic Level
L = LOW Logic Level
X = Either LOW or HIGH Logic Level
DM7420 Dual 4-Input NAND Gate
© 2000 Fairchild Semiconductor Corporation DS006506 www.fairchildsemi.com
Absolute Maximum Ratings(Note 1)
Supply Voltage 7V
DM7420
Input Voltage 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Note 1: The “Absolute Maximum Ratin gs” are those v alues beyon d which
the safety of the dev ice cannot be guaranteed. T he device sh ould not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions” t able w ill defin e the c ondit ions
for actual device operation.
Recommended Operating Conditions
Symbol Parameter Min Nom Max Units
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage 4.75 5 5.25 V
HIGH Level Input Voltage 2 V
LOW Level In put Voltag e 0.8 V
HIGH Level Output Current −0.4 mA
LOW Level Output Current 16 mA
Free Air Operating Temperature 0 70 °C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
V
I
V
OH
V
OL
I
I
I
IH
I
IL
I
OS
I
CCH
I
CCL
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time.
Input Clamp Voltage VCC = Min, II = −12 mA −1.5 V
HIGH Level VCC = Min, IOH = Max
Output Voltage VIL = Max
LOW Level VCC = Min, IOL = Max
Output Voltage VIH = Min
Input Current @ Max VCC = Max, VI = 5.5V 1 mA
Input Voltage
HIGH Level Input Current VCC = Max, VI = 2.4V 40 µA
LOW Level Input Current VCC = Max, VI = 0.4V −1.6 mA
Short Circuit Output Current VCC = Max (Note 3) −18 −55 mA
Supply Current with Outputs HIGH VCC = Max 2 4 mA
Supply Current with Outputs LOW VCC = Max 6 11 mA
Typ
(Note 2)
2.4 3.4 V
0.2 0.4 V
Max Units
Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol Parameter Conditions Min Max Units
t
PLH
t
PHL
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Propagation Delay Time CL = 15 pF
LOW-to-HIGH Level Output RL = 400Ω
Propagation Delay Time
HIGH-to-LOW Level Output
22 ns
15 ns
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