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54ACT138D View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
54ACT138D 1-of-8 Decoder/Demultiplexer National-Semiconductor
National ->Texas Instruments National-Semiconductor
54ACT138D Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Functional Description
The ’AC/’ACT138 high-speed 1-of-8 decoder/demultiplexer
accepts three binary weighted inputs (A0, A1, A2) and, when
enabled, provides eight mutually exclusive active-LOW out-
puts (O0–O7). The ’AC/’ACT138 features three Enable in-
puts, two active-LOW (E1, E2) and one active-HIGH (E3). All
outputs will be HIGH unless E1 and E2 are LOW and E3 is
HIGH. This multiple enable function allows easy parallel ex-
Truth Table
Inputs
E1
E2
E3
A0
A1
A2
O0
O1
O2
HXXXXXHHH
XHXXXXHHH
XX L XXXHHH
pansion of the device to a 1-of-32 (5 lines to 32 lines) de-
coder with just four ’AC/’ACT138 devices and one inverter
(see Figure 1). The ’AC/’ACT138 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
Enable inputs which are not used must be permanently tied
to their appropriate active-HIGH or active-LOW state.
Outputs
O3 O4 O5 O6 O7
HHHHH
HHHHH
HHHHH
L
L
H
L
L
L
L
HHHHHHH
L
L
HH
L
L
H
L
HHH
HHH
L
L
H
L
H
L
HH
L
HHHHH
L
L
HHH
L
HHH
L
H
HHH
L
L
H
L
L
HHHHH
L
HHH
L
L
HH
L
HHHHHH
L
HH
L
L
H
L
HHHHHHHH
L
H
L
L
HHHHHHHHHHH
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
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