5962-8858901DA Datasheet, PDF (3/18 Pages) Texas Instruments – DUAL 4-INPUT POSITIVE-NAND GATES

SN54ALS20A, SN54AS20, SN74ALS20A, SN74AS20
DUAL 4ĆINPUT POSITIVEĆNAND GATES
SDAS192B − APRIL 1982 − REVISED DECEMBER 1994
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX†
SN54ALS20A SN74ALS20A
MIN MAX MIN MAX
tPLH
tPHL
A, B, C, or D
1 12.5
3
11
Y
1
11
3
10
† _{For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.}
UNIT
ns
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)^‡
Supply voltage, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V_I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, T_A: SN54AS20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
SN74AS20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
‡ _{Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and}
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
VCC
VIH
VIL
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
SN54AS20
MIN NOM MAX
4.5
5 5.5
2
0.8
−2
20
− 55
125
SN74AS20
MIN NOM MAX
4.5
5 5.5
2
0.8
−2
20
0
70
UNIT
V
V
V
mA
mA
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54AS20
MIN TYP§ MAX
SN74AS20
MIN TYP§ MAX ^UNIT
VIK
VCC = 4.5 V,
II = −18 mA
−1.2
−1.2 V
VOH
VCC = 4.5 V to 5.5 V,
IOH = − 2 mA
VCC − 2
VCC − 2
V
VOL
VCC = 4.5 V,
IOL = 20 mA
0.35 0.5
0.35 0.5 V
II
VCC = 5.5 V,
VI = 7 V
0.1
0.1 mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
20 µA
IIL
VCC = 5.5 V,
IO¶
VCC = 5.5 V,
VI = 0.4 V
VO = 2.25 V
− 0.5
−0.5 mA
− 30
−112 −30
−112 mA
ICCH
VCC = 5.5 V,
VI = 0
1 1.6
1 1.6 mA
ICCL
VCC = 5.5 V,
VI = 4.5 V
5.4 8.7
5.4 8.7 mA
§ _{All typical values are at VCC = 5 V, TA = 25°C.}
¶ _{The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.}
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