HITACHI HD74AC538

HD74AC538
1-of-8 Decoder with 3-State Output
Description
The HD74AC538 decoder/demultiplexer accepts three Address (A0 to A2) input signal and decodes them
to select one of eight mutually exclusive outputs. A polarity control input (P) determines whether the
outputs are active LOW or active HIGH. A HIGH signal on either of the active LOW output Enable (OE)
inputs forces all outputs to the high impedance state. Two active HIGH and two active LOW input enables
are available for easy expansion to 1-of-32 decoding with four packages, or for data demultiplexing to 1-of8 or 1-of-16 destinations.
Features
•
•
•
•
Output Polarity Control
Data Demultiplexing Capability
Multiple Enables for Expansion
Outputs Source/Sink 24 mA
HD74AC538
Pin Arrangement
O2 1
20 VCC
O1 2
19 O3
O0 3
18 O4
OE1 4
17 A2
OE2 5
16 E1
A0 6
15 E2
A1 7
14 E3
O5 8
13 E4
O6 9
12 P
11 O7
GND 10
(Top view)
Logic Symbol
P
A0 A1 A2
E1
E2
E3
E4
OE1
OE2
O0 O1 O2 O3 O4 O5 O6 O7
2
HD74AC538
Pin Names
A0 to A2
E1, E2
E3, E4
P
OE1, OE2
O0 to O7
Address Inputs
Enable Inputs (Active LOW)
Enable Inputs (Active HIGH)
Polarity Control Input
Output Enable Inputs (Active LOW)
3-State Outputs
Logic Diagram
A2
A1
A0
E1
E2
E3
E4
P
OE1
OE2
O0
O1
O2
O3
O4
O5
O6
O7
3
HD74AC538
Truth Table
Inputs
Outputs
Function
OE1 OE2 E1
E2
E3
E4
A2
A1
A0
O0
O1
O2
O3
O4
O5
O6
O7
High impedance
H
X
X
X
X
X
X
X
X
X
Z
Z
Z
Z
Z
Z
Z
Z
H
X
X
X
X
X
X
X
Z
Z
Z
Z
Z
Z
Z
Z
L
L
H
X
X
X
X
X
X
Outputs equal input
L
L
X
H
X
X
X
X
X
L
L
X
X
L
X
X
X
X
L
L
X
X
X
L
X
X
X
Active HIGH output
L
L
L
L
H
H
L
L
L
H
L
L
L
L
L
L
L
(P = L)
L
L
L
L
H
H
L
L
H
L
H
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
L
L
H
L
L
L
L
L
L
L
L
L
H
H
L
H
H
L
L
L
H
L
L
L
L
L
L
L
L
H
H
H
L
L
L
L
L
L
H
L
L
L
L
L
L
L
H
H
H
L
H
L
L
L
L
L
H
L
L
L
L
L
L
H
H
H
H
L
L
L
L
L
L
L
H
L
L
L
L
L
H
H
H
H
H
L
L
L
L
L
L
L
H
Active LOW output
L
L
L
L
H
H
L
L
L
L
H
H
H
H
H
H
H
(P = L)
L
L
L
L
H
H
L
L
H
H
L
H
H
H
H
H
H
L
L
L
L
H
H
L
H
L
H
H
L
H
H
H
H
H
L
L
L
L
H
H
L
H
H
H
H
H
L
H
H
H
H
L
L
L
L
H
H
H
L
L
H
H
H
H
L
H
H
H
L
L
L
L
H
H
H
L
H
H
H
H
H
H
L
H
H
L
L
L
L
H
H
H
H
L
H
H
H
H
H
H
L
H
L
L
L
L
H
H
H
H
H
H
H
H
H
H
H
H
L
Disable
H
L
X
Z
:
:
:
:
High Voltage Level
Low Voltage Level
Immaterial
High Impedance
DC Characteristics (unless otherwise specified)
Item
Symbol
Max
Unit
Condition
Maximum quiescent supply current
I CC
80
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = Worst case
Maximum quiescent supply current
I CC
8.0
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
4
HD74AC538
AC Characteristics: HD74AC538
Ta = +25°C
CL = 50 pF
Ta = –40°C to +85°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
t PLH
3.3
1.0
10.5
17.5
1.0
20.0
ns
5.0
1.0
8.0
12.5
1.0
14.0
3.3
1.0
9.5
17.5
1.0
20.0
5.0
1.0
7.0
12.0
1.0
14.0
3.3
1.0
11.0
19.5
1.0
23.0
5.0
1.0
8.0
14.5
1.0
16.5
3.3
1.0
10.0
19.5
1.0
23.0
5.0
1.0
8.0
14.0
1.0
16.5
3.3
1.0
11.0
19.5
1.0
23.0
5.0
1.0
8.5
14.5
1.0
17.0
3.3
1.0
10.5
20.0
1.0
23.5
5.0
1.0
8.0
15.0
1.0
18.0
3.3
1.0
10.5
15.5
1.0
17.5
5.0
1.0
9.0
11.0
1.0
12.5
3.3
1.0
9.0
15.0
1.0
17.0
5.0
1.0
7.5
10.5
1.0
11.5
3.3
1.0
7.0
14.0
1.0
15.5
5.0
1.0
5.0
8.5
1.0
9.5
3.3
1.0
8.5
16.5
1.0
19.0
5.0
1.0
5.5
9.5
1.0
11.5
3.3
1.0
7.0
14.0
1.0
15.5
5.0
1.0
6.0
10.5
1.0
11.5
3.3
1.0
9.0
14.5
1.0
17.0
5.0
1.0
7.0
10.5
1.0
12.0
An to O n
Propagation delay
t PHL
An to O n
Propagation delay
t PLH
E1, or E2 to O n
Propagation delay
t PHL
E1, or E2 to O n
Propagation delay
t PLH
E3, or E4 to O n
Propagation delay
t PHL
E3, or E4 to O n
Propagation delay
t PLH
P to O n
Propagation delay
t PHL
P to O n
Propagation delay
t PZH
OEn to O n
Propagation delay
t PZL
OEn to O n
Propagation delay
t PHZ
OEn to O n
Propagation delay
t PLZ
OEn to O n
Note:
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Symbol
Typ
Unit
Condition
Input capacitance
CIN
4.5
pF
VCC = 5.5 V
Power dissipation capacitance
CPD
100
pF
VCC = 5.0 V
5
Unit: mm
24.50
25.40 Max
6.30
11
1
7.00 Max
20
10
1.30
2.54 ± 0.25
0.48 ± 0.10
0.51 Min
1.27 Max
2.54 Min 5.08 Max
0.89
7.62
+ 0.11
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-20N
—
Conforms
1.26 g
Unit: mm
12.6
13 Max
11
1
10
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
20
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-20DA
—
Conforms
0.31 g
Unit: mm
12.8
13.2 Max
11
1
10
0.20 ± 0.10
0.935 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*0.27 ± 0.05
0.25 ± 0.04
2.65 Max
7.50
20
0.25
10.40 +– 0.40
1.45
0° – 8°
0.57
0.70 +– 0.30
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-20DB
Conforms
—
0.52 g
Unit: mm
6.50
6.80 Max
11
1
10
4.40
20
0.65
*0.22+0.08
–0.07
0.20 ± 0.06
1.0
0.13 M
6.40 ± 0.20
*Dimension including the plating thickness
Base material dimension
0.07 +0.03
–0.04
0.10
*0.17 ± 0.05
0.15 ± 0.04
1.10 Max
0.65 Max
0° – 8°
0.50 ± 0.10
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
TTP-20DA
—
—
0.07 g
Cautions
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copyright, trademark, or other intellectual property rights for information contained in this document.
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intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
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 failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
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products.
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