ꢀꢁꢂ ꢃ ꢄꢅ ꢆ ꢇꢈ ꢀꢁ ꢉꢃ ꢄꢅ ꢆꢇ
ꢊꢋꢌ ꢍ ꢃ ꢎꢏꢁ ꢐꢋꢑ ꢐꢒ ꢀꢏ ꢑ ꢏꢓꢔ ꢎꢌꢁꢊ ꢕ ꢌꢑꢔ ꢀ
SCLS087E − DECEMBER 1982 − REVISED AUGUST 2003
D
D
D
Wide Operating Voltage Range of 2 V to 6 V
Outputs Can Drive Up To 10 LSTTL Loads
D
D
D
Typical t = 11 ns
pd
4-mA Output Drive at 5 V
Low Power Consumption, 20-µA Max I
Low Input Current of 1 µA Max
CC
SN54HC21 . . . FK PACKAGE
(TOP VIEW)
SN54HC21 . . . J OR W PACKAGE
SN74HC21 . . . D, N, NS, OR PW PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
14
13
12
11
10
9
1A
1B
V
CC
3
2
1
20 19
18
2D
2C
NC
2B
2A
2Y
2C
NC
NC
NC
NC
1C
NC
1D
4
5
6
7
8
NC
1C
17
16
1D
15 NC
14
9 10 11 12 13
1Y
2B
8
GND
NC − No internal connection
description/ordering information
These devices contain two independent 4-input AND gates. They perform the Boolean function
Y + A • B • C • D or Y + A ) B ) C ) D
in positive logic.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP − N
Tube of 25
Tube of 50
Reel of 2500
Reel of 250
Reel of 2000
Tube of 90
Reel of 2000
Reel of 250
Tube of 25
Tube of 150
Tube of 55
SN74HC21N
SN74HC21N
SN74HC21D
SN74HC21DR
SN74HC21DT
SN74HC21NSR
SN74HC21PW
SN74HC21PWR
SN74HC21PWT
SNJ54HC21J
SOIC − D
SOP − NS
HC21
HC21
−40°C to 85°C
TSSOP − PW
HC21
CDIP − J
CFP − W
LCCC − FK
SNJ54HC21J
SNJ54HC21W
SNJ54HC21FK
−55°C to 125°C
SNJ54HC21W
SNJ54HC21FK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright 2003, Texas Instruments Incorporated
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