HD74AC138T [HITACHI]
Decoder/Driver, AC Series, Inverted Output, CMOS, PDSO16, TTP-16DA;
| 型号： | HD74AC138T |
| 厂家： | 
HITACHI SEMICONDUCTOR |
| 描述： | Decoder/Driver, AC Series, Inverted Output, CMOS, PDSO16, TTP-16DA 驱动 光电二极管 逻辑集成电路 |
| 文件： | 总11页 (文件大小：65K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
HD74AC138/HD74ACT138
Pin Arrangement
1
2
3
4
5
16 VCC
A0
A1
A2
E1
E2
15 O0
14
13
O1
O2
12 O3
11 O4
10 O5
E3 6
7
8
O7
GND
9
O6
(Top view)
Logic Symbol
A0 A1 A2
E1 E2 E3
O0 O1 O2 O3 O4 O5 O6 O7
Pin Names
A0 to A2
E1 to E2
E 3
Address Inputs
Enable Inputs
Enable Input
O0 to O 7 Outputs
2
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
H
X
X
L
E 2
E3
X
X
L
A0
X
X
X
L
A1
X
X
X
L
A2
X
X
X
L
O0
H
H
H
L
O 1
O 2
H
H
H
H
H
L
O 3
H
H
H
H
H
H
L
O 4
H
H
H
H
H
H
H
L
O 5
H
H
H
H
H
H
H
H
L
O 6
H
H
H
H
H
H
H
H
H
L
O 7
H
H
H
H
H
H
H
H
H
H
L
X
H
X
L
L
L
L
L
L
L
L
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
L
L
L
H
H
H
H
H
H
H
L
H
H
L
L
H
H
H
H
H
H
L
H
L
L
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
L
L
H
H
H
L
H
H
H
H
L
H
H
H :
High Voltage Level
Low Voltage Level
Immaterial
L
:
:
X
3
HD74AC138/HD74ACT138
Logic Diagram
A2
A1
A0
E1 E2 E3
O7
O6
O5
O4
O3
O2
O1
O0
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
Figure a: Expansion of 1-of-32 Decoding
A0
A1
A2
’04
A3
A4
H
123
E
123
E
123
E
123
E
A0 A1 A2
A0 A1 A2
A0 A1 A2
A0 A1 A2
O0 O1 O2 O3O4 O5 O6 O7
O0 O1 O2 O3O4 O5 O6 O7
O0 O1 O2 O3O4 O5 O6 O7
O0 O1 O2 O3O4 O5 O6 O7
O0
O31
4
HD74AC138/HD74ACT138
DC Characteristics (unless otherwise specified)
Item
Symbol Max
Unit
Condition
Maximum quiescent supply current
ICC
ICC
ICCT
80
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = Worst case
Maximum quiescent supply current
Maximum ICC/input (HD74ACT138)
8.0
1.5
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
mA
VIN = VCC – 2.1 V, VCC = 5.5 V
Ta = Worst case
AC Characteristics: HD74AC138
Ta = +25°C
Ta = –40°C to +85°C
CL = 50 pF
CL = 50 pF
Item
Symbol VCC (V)*1
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Typ
Max
13.0
9.5
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max
15.0
10.5
14.0
10.5
16.0
12.0
15.0
10.5
16.5
12.5
14.0
9.5
Unit
Propagation delay
An to On
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
8.5
6.5
8.0
6.0
ns
Propagation delay
An to On
12.5
9.0
ns
ns
ns
ns
ns
Propagation delay
E1 or E 2 to On
Propagation delay
E1 or E 2 to On
Propagation delay
E3 to On
11.0
8.0
9.5
7.0
11.0
8.0
8.5
6.0
15.0
11.0
13.5
9.5
15.5
11.0
13.0
8.0
Propagation delay
E3 to On
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
5
HD74AC138/HD74ACT138
AC Characteristics: HD74ACT138
Ta = +25°C
Ta = –40°C to +85°C
CL = 50 pF
CL = 50 pF
Item
Symbol VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
An to On
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
5.0
5.0
5.0
5.0
5.0
5.0
1.0
7.0
6.5
8.0
7.5
8.0
6.5
10.5
1.0
11.5
ns
Propagation delay
An to On
1.0
1.0
1.0
1.0
1.0
10.5
11.5
11.5
12.0
10.5
1.0
1.0
1.0
1.0
1.0
11.5
12.5
12.5
13.0
11.5
ns
ns
ns
ns
ns
Propagation delay
E1 or E 2 to On
Propagation delay
E1 or E 2 to On
Propagation delay
E3 to On
Propagation delay
E3 to On
Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Symbol
CIN
Typ
Unit
Condition
VCC = 5.5 V
VCC = 5.0 V
Input capacitance
Power dissipation capacitance
4.5
pF
pF
CPD
60.0
6
Unit: mm
19.20
20.00 Max
16
1
9
8
1.3
1.11 Max
7.62
+ 0.13
– 0.05
0.25
2.54 ± 0.25
0.48 ± 0.10
0° – 15°
Hitachi Code
DP-16
JEDEC
EIAJ
Conforms
Conforms
Weight (reference value) 1.07 g
Unit: mm
10.06
10.5 Max
9
16
1
8
+ 0.20
7.80
– 0.30
0.80 Max
1.15
0° – 8°
1.27
0.70 ± 0.20
*0.42 ± 0.08
0.40 ± 0.06
0.15
M
0.12
Hitachi Code
JEDEC
EIAJ
FP-16DA
—
Conforms
*Dimension including the plating thickness
Base material dimension
Weight (reference value) 0.24 g
Unit: mm
9.9
10.3 Max
9
16
1
8
1.27
+ 0.10
6.10
– 0.30
1.08
0.635 Max
0° – 8°
+ 0.67
0.60
– 0.20
*0.42 ± 0.08
0.40 ± 0.06
0.15
0.25
M
Hitachi Code
JEDEC
EIAJ
FP-16DN
Conforms
Conforms
*Dimension including the plating thickness
Base material dimension
Weight (reference value) 0.15 g
Unit: mm
5.00
5.30 Max
16
9
1
8
0.65
0.13 M
0.65 Max
1.0
+ 0.08
– 0.07
*0.22
0.20 ± 0.06
6.40 ± 0.20
0° – 8°
0.50 ± 0.10
0.10
Hitachi Code
JEDEC
EIAJ
TTP-16DA
—
—
*Dimension including the plating thickness
Base material dimension
Weight (reference value) 0.05 g
Cautions
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received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-
safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
相关型号：
HD74AC138TVELL
AC SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDSO16, LEAD FREE, TSSOP-16
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