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SN74AS21N 数据表(PDF) 3 Page - Texas Instruments

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部件名 SN74AS21N
功能描述  DUAL 4-INPUT POSITIVE-AND GATES
Download  5 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

SN74AS21N 数据表(HTML) 3 Page - Texas Instruments

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SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21
DUAL 4-INPUT POSITIVE-AND GATES
SDAS085B – APRIL 1982 – REVISED DECEMBER 1994
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN54AS21
– 55
°C to 125°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74AS21
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
SN54AS21
SN74AS21
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
IOH
High-level output current
–2
–2
mA
IOL
Low-level output current
20
20
mA
TA
Operating free-air temperature
–55
125
0
70
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54AS21
SN74AS21
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP‡
MAX
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,
VI = 0.4 V
– 0.5
– 0.5
mA
IO§
VCC = 5.5 V,
VO = 2.25 V
–30
–112
–30
–112
mA
ICCH
VCC = 5.5 V,
VI = 4.5 V
2.9
4.6
2.9
4.6
mA
ICCL
VCC = 5.5 V,
VI = 0
7.4
12
7.4
12
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.
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¶
UNIT
(INPUT)
(OUTPUT)
SN54AS21
SN74AS21
MIN
MAX
MIN
MAX
tPLH
ABCor D
Y
1
6.5
1
6
ns
tPHL
A, B, C, or D
Y
1
6.5
1
6
ns
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.


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