Datasheet
74HC21_5 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 05 — 7 May 2009 2 of 14
NXP Semiconductors
74HC21
Dual 4-input AND gate
4. Functional diagram
5. Pinning information
5.1 Pinning
Fig 1. Functional diagram Fig 2. Logic symbol
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1A
1B
1C
1D
1
2
4
6
1Y
5
2A
2B
2C
2D
9
10
12
8
2Y
13
001aab973
1A
1B
1C
1D
1
2
4
6
1Y
5
2A
2B
2C
2D
9
10
12
8
2Y
13
Fig 3. IEC Logic symbol Fig 4. Logic diagram
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&
6
1
2
4
5
&
8
9
10
12
13
001aab976
A
B
C
D
Y
Fig 5. Pin configuration SOT27-1 and SOT108-1 Fig 6. Pin configuration SOT337-1 and SOT402-1
1A V
CC
1B 2D
n.c. 2C
1C n.c.
1D 2B
1Y 2A
GND 2Y
001aab972
1
2
3
4
5
6
7 8
10
9
12
11
14
13
74HC21
74HC21
1A V
CC
1B 2D
n.c. 2C
1C n.c.
1D 2B
1Y 2A
GND 2Y
001aai659
1
2
3
4
5
6
7
8
10
9
12
11
14
13