HIT HD74HC154 Datasheet

HD74HC154

4-to-16-line Decoder/Demultiplexer

Description

The HD74HC154 has 4 binary select inputs (A, B, C and D). IF the device is enabled these inputs
determine which one of the 16 normally high outputs will go low. Two active low enables (G1 and G2) are
provided to ease cascading of decoders with little or no external logic.

Features

• High Speed Operation: tpd (A, B, C, D to Y) = 19 ns typ (CL = 50 pF)

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: VCC = 2 to 6 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

HD74HC154

Function Table

Inputs Outputs
G

1G2

LLLLLLLHHHHHHHHHHHHHHH
LLLLLHHLHHHHHHHHHHHHHH
LLLLHLHHLHHHHHHHHHHHHH
LLLLHHHHHL HHHHHHHHHHHH
LLLHLLHHHHLHHHHHHHHHHH
LLLHLHHHHHHL HHHHHHHHHH
LLLHHLHHHHHHL HHHHHHHHH
LLLHHHHHHHHHHL HHHHHHHH
LLHLL LHHHHHHHHLHHHHHHH
LL HLL HHHHHHHHHHL HHHHHH
LL HLHL HHHHHHHHHHLHHHHH
LL HLHHHHHHHHHHHHHLHHHH
LL HHL LHHHHHHHHHHHHLHHH
LL HHL HHHHHHHHHHHHHHLHH
LL HHHL HHHHHHHHHHHHHHLH
LL HHHHHHHHHHHHHHHHHHHL
LHXXXXHHHHHHHHHHHHHHHH
HLXXXXHHHHHHHHHHHHHHHH
HHXXXXHHHHHHHHHHHHHHHH

X : Irrelevant

DCBA0123456789101112131415

2

Pin Arrangement

Outputs

Y
Y1
Y2
Y3
Y4
Y5

HD74HC154

1

0

2
3
4
5
6

0

1
2
3
4

5

A
B
C
D

G

2

24
23
22
21
20
19

V

CC

A
B
C

Inputs

D
G

2

Y6
Y7
Y8
Y9

Y10

GND

10
11
12

7
8
9

6
7
8
9
10

11

(Top view)

G1

15
14
13
12

18
17
16
15
14
13

G1
Y15
Y14
Y13
Y12
Y11

Outputs

3