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HD74AC138TELL Datasheet(PDF) 4 Page - Renesas Technology Corp

Part # HD74AC138TELL
Description  1-of-8 Decoder/Demultiplexer
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD74AC138TELL Datasheet(HTML) 4 Page - Renesas Technology Corp

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HD74AC138/HD74ACT138
Rev.2.00, Jul.16.2004, page 2 of 9
Logic Symbol
A0 A1 A2
E1
O0 O1 O2 O3 O4 O5 O6 O7
E2 E3
Pin Names
A
0 to A2
Address Inputs
E
1 to E 2
Enable Inputs
E
3
Enable Input
O
0 to O 7
Outputs
Functional Description
The HD74AC138/HD74ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A
0, A1,
A
2) and, when enabled, provides eight mutually exclusive active-LOW outputs (O0 to O7). The
HD74AC138/HD74ACT138 features three Enable inputs, two active-Low (
E
1, E2) and one active-High (E3). All
outputs will be High unless
E
1 and E2 are Low and E3 is High. This multiple enabled function allows easy parallel
expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four HD74AC138/HD74ACT138 devices
and one inverter (See Figure a). The HD74AC138/HD74ACT138 can be used as an 8-output demultiplexer by using
one of the active Low Enable inputs as the data input and the other Enable inputs as strobes. The Enables inputs which
are not used must be permanently tied to their appropriate active-High or active-Low state.
Truth Table
Inputs
Outputs
E
EE
E
1
E
EE
E
2
E
3
A
0
A
1
A
2
O
O
O
O
0
O
O
O
O
1
O
O
O
O
2
O
O
O
O
3
O
O
O
O
4
O
O
O
O
5
O
O
O
O
6
O
O
O
O
7
H
XX
XXXH
HHHH
HHH
X
H
X
XXXH
HHHH
HHH
X
XL
XXXH
HHHH
HHH
L
LH
LLLL
HHHH
HHH
L
L
H
H
L
L
H
L
HHH
HHH
L
L
H
L
H
L
HH
L
H
HH
H
H
L
L
H
H
H
L
H
HHL
H
HHH
L
L
H
L
L
H
H
HHHL
HHH
L
L
H
H
L
H
H
HHHH
L
HH
L
L
H
L
H
H
H
HHHH
HL
H
L
L
H
HHHH
HHHH
HHL
H :
High Voltage Level
L
:
Low Voltage Level
X :
Immaterial


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