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National Semiconductor Electronic Components Datasheet

54ACT138 Datasheet

1-of-8 Decoder/Demultiplexer

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54ACT138 pdf
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August 1998
54AC138 54ACT138
1-of-8 Decoder/Demultiplexer
General Description
The ’AC/’ACT138 is a high-speed 1-of-8 decoder/
demultiplexer. This device is ideally suited for high-speed bi-
polar memory chip select address decoding. The multiple in-
put enables allow parallel expansion to a 1-of-24 decoder
using just three ’AC/’ACT138 devices or a 1-of-32 decoder
using four ’AC/’ACT138 devices and one inverter.
Features
n ICC reduced by 50%
n Demultiplexing capability
n Multiple input enable for easy expansion
n Active LOW mutually exclusive outputs
n Outputs source/sink 24 mA
n ’ACT138 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC138: 5962-87622
— ’ACT138: 5962-87554
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP and Flatpak
IEEE/IEC
DS100268-1
Pin Names
A0– A2
E1– E2
E3
O0– O7
Description
Address Inputs
Enable Inputs
Enable Input
Outputs
DS100268-7
DS100268-2
Pin Assignment
for LCC
DS100268-3
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100268
www.national.com


National Semiconductor Electronic Components Datasheet

54ACT138 Datasheet

1-of-8 Decoder/Demultiplexer

No Preview Available !

54ACT138 pdf
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 LHL L L LHHHHHHH
L LHHL LHLHHHHHH
L LHLHLHHLHHHHH
L LHHHLHHHLHHHH
L LHL LHHHHHLHHH
L LHHLHHHHHHLHH
L LHLHHHHHHHHLH
L LHHHHHHHHHHHL
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
www.national.com
2


Part Number 54ACT138
Description 1-of-8 Decoder/Demultiplexer
Maker National Semiconductor
Total Page 10 Pages
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