SGS Thomson Microelectronics 74AC20TTR, 74AC20MTR, 74AC20M, 74AC20B Datasheet
1/8April 2001
■ HIGH SPEED: t
PD
= 4ns (TYP.) at VCC = 5V
■ LOW POWER DISSIPATION:
I
CC
= 2µA(MAX.) at TA=25°C
■ HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28 % VCC (MIN.)
■ 50Ω TRANSMISSION LINE DRIVING
CAPABILITY
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = IOL = 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 stat ic 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
TSSOPDIP SOP
74AC20
2/8
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE
X : Don’t Ca re
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) VIN 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
ABCDY
LXXXH
XLXXH
XXLXH
XXXLH
HHHHL
Symbol Parameter Value Unit
V
CC
Supply Voltage
-0.5 to +7 V
V
I
DC Input Voltage -0.5 to VCC + 0.5
V
V
O
DC Output Voltage -0.5 to VCC + 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 VCC 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) Maxim um test duration 2ms, one output loaded at time
2) Incid ent wave swi tc hi ng is guara nt eed on transmi ssion line s wi t h i mpedance s as low as 50Ω
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf = 3ns)
(*) Vol tage 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
V4.5 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
V4.5 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 µA
2.9 2.99 2.9 2.9
V
4.5
I
O
=-50 µA
4.4 4.49 4.4 4.4
5.5
I
O
=-50 µA
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
IO=50 µA
0.002 0.1 0.1 0.1
V
4.5
I
O
=50 µA
0.001 0.1 0.1 0.1
5.5
I
O
=50 µA
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
= VCC or GND
± 0.1 ± 1 ± 1 µA
I
CC
Quiescent Supply
Current
5.5
V
I
= VCC or GND
22040µA
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 tPHL
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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