1/8
April 2001
■
HIGH SPEED: t
PD
= 4ns (TYP.) at V
CC
= 5V
■
LOW POWER DISSIPATION:
I
CC
= 2
µ
A(MAX.) at T
A
=25°C
■
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
■
50
Ω
TRANSMISSION LINE DRIVING
CAPABILITY
■
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24mA (MIN)
■
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
■
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
■
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 20
■
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
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
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
Ω
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, R
L
= 500
Ω
, 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
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
Ω
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
Ω
)
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
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
74AC20
8/8
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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