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HD74ACT138 の電気的特性と機能

HD74ACT138のメーカーはHitachi Semiconductorです、この部品の機能は「1-of-8 Decoder/Demultiplexer」です。


製品の詳細 ( Datasheet PDF )

部品番号 HD74ACT138
部品説明 1-of-8 Decoder/Demultiplexer
メーカ Hitachi Semiconductor
ロゴ Hitachi Semiconductor ロゴ 




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HD74ACT138 Datasheet, HD74ACT138 PDF,ピン配置, 機能
HD74AC138/HD74ACT138
1-of-8 Decoder/Demultiplexer
Description
The HD74AC138/HD74ACT138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally
suited for high-speed bipolar memory chip select address decoding. The multiple input enables allow
parallel expansion to a 1-of-24 decoder using just three HD74AC138/HD74ACT138 devices or a 1-of-32
decoder using four HD74AC138/HD74ACT138 devices and one inverter.
Features
Demultiplexing Capability
Multiple Input Enable for Easy Expansion
Active LOW Mutually Exclusive Outputs
Outputs Source/Sink 24 mA
HD74ACT138 has TTL-Compatible Inputs

1 Page





HD74ACT138 pdf, ピン配列
HD74AC138/HD74ACT138
Functional Description
The HD74AC138/HD74ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted
inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active-LOW outputs (O0 to O7).
The HD74AC138/HD74ACT138 features three Enable inputs, 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 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
E1 E 2 E3 A0 A1 A2 O0 O 1 O 2 O 3 O 4 O 5 O 6 O 7
HX X X X X H H H H H H H H
XH X X X X H H H H H H H H
XX L X X X H H H H H H H H
LL H L L L L H H H H H H H
LL H H L L H L H H H H H H
LL H L H L H H L H H H H H
LL H H H L H H H L H H H H
LL H L L H H H H H L H H H
LL H H L H H H H H H L H H
LL H L H H H H H H H H L H
LL H H H H H H H H H H H L
H : High Voltage Level
L : Low Voltage Level
X : Immaterial
3


3Pages


HD74ACT138 電子部品, 半導体
HD74AC138/HD74ACT138
AC Characteristics: HD74ACT138
Item
Symbol VCC (V)*1
Propagation delay
An to On
t PLH
5.0
Propagation delay
An to On
t PHL
5.0
Propagation delay
E1 or E 2 to On
t PLH
5.0
Propagation delay
E1 or E 2 to On
t PHL
5.0
Propagation delay
E3 to On
t PLH
5.0
Propagation delay
E3 to On
t PHL
5.0
Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Ta = +25°C
CL = 50 pF
Min Typ
1.0 7.0
1.0 6.5
1.0 8.0
1.0 7.5
1.0 8.0
1.0 6.5
Max
10.5
10.5
11.5
11.5
12.0
10.5
Ta = –40°C to +85°C
CL = 50 pF
Min Max
1.0 11.5
Unit
ns
1.0 11.5 ns
1.0 12.5 ns
1.0 12.5 ns
1.0 13.0 ns
1.0 11.5 ns
Capacitance
Item
Input capacitance
Power dissipation capacitance
Symbol
CIN
CPD
Typ
4.5
60.0
Unit
pF
pF
Condition
VCC = 5.5 V
VCC = 5.0 V
6

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
HD74ACT138

1-of-8 Decoder/Demultiplexer

Hitachi Semiconductor
Hitachi Semiconductor
HD74ACT138

1-of-8 Decoder/Demultiplexer

Renesas
Renesas
HD74ACT139

Dual 1-of-4 Decoder/Demultiplexer

Hitachi Semiconductor
Hitachi Semiconductor


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