74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
Rev. 5 — 13 June 2018
Product data sheet
1
General description
The 74HC238; 74HCT238 decodes three binary weighted address inputs (A0, A1 and
A2) to eight mutually exclusive outputs (Y0 to Y7). The device features three enable
inputs (E1 and E2 and E3). Every output will be LOW unless E1 and E2 are LOW and
E3 is HIGH. This multiple enable function allows easy parallel expansion to a 1-of-32
(5 to 32 lines) decoder with just four '238 ICs and one inverter. The '238 can be used
as an eight output demultiplexer by using one of the active LOW enable inputs as the
data input and the remaining enable inputs as strobes. Inputs include clamp diodes. This
enables the use of current limiting resistors to interface inputs to voltages in excess of
V
CC
.
2
Features and benefits
•
•
•
•
•
•
•
Demultiplexing capability
Multiple input enable for easy expansion
Ideal for memory chip select decoding
Active HIGH mutually exclusive outputs
Multiple package options
Complies with JEDEC standard no. 7A
Input levels:
–
For 74HC238: CMOS level
–
For 74HCT238: TTL level
•
ESD protection:
–
HBM JESD22-A114F exceeds 2000 V
–
MM JESD22-A115-A exceeds 200 V
•
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
3
Ordering information
Package
Temperature range
Name
SO16
Description
plastic small outline package; 16 leads;
body width 3.9 mm
plastic shrink small outline package; 16 leads;
body width 5.3 mm
plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
Version
SOT109-1
-40 °C to +125 °C
Table 1. Ordering information
Type number
74HC238D
74HCT238D
74HC238DB
74HCT238DB
74HC238PW
74HCT238PW
-40 °C to +125 °C
TSSOP16
-40 °C to +125 °C
SSOP16
SOT338-1
SOT403-1
Nexperia
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
Package
Temperature range
Name
Description
Version
SOT763-1
-40 °C to +125 °C
DHVQFN16 plastic dual in-line compatible thermal enhanced
very thin quad flat package; no leads; 16 terminals;
body 2.5 x 3.5 x 0.85 mm
Type number
74HC238BQ
74HCT238BQ
4
Functional diagram
15
14
A0
A1
A2
1
2
3
3 TO 8
DECODER
ENABLE
EXITING
13
12
11
10
9
7
E1
E2
E3
001aag752
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
15
14
A0
A1
A2
1
2
3
3 TO 8
DECODER
13
ENABLE 12
EXITING 11
10
9
7
E1
E2
E3
4
5
6
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
4
5
6
001aag753
Figure 1. Logic symbol
Figure 2. Functional diagram
Y0
E1
E2
E3
Y1
Y2
Y3
Y4
A0
Y5
A1
Y6
A2
Y7
001aag754
Figure 3. Logic diagram
74HC_HCT238
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2018. All rights reserved.
Product data sheet
Rev. 5 — 13 June 2018
2 / 18
Nexperia
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
5
Pinning information
5.1 Pinning
74HC238
74HCT238
terminal 1
index area
16 V
CC
15 Y0
14 Y1
13 Y2
12 Y3
GND
(1)
8
9
Y6
11 Y4
10 Y5
GND
A0
2
3
4
5
6
7
1
74HC238
74HCT238
A0
A1
A2
E1
E2
E3
Y7
GND
1
2
3
4
5
6
7
8
001aag755
A1
A2
16 V
CC
15 Y0
14 Y1
13 Y2
12 Y3
11 Y4
10 Y5
9
Y6
E1
E2
E3
Y7
001aag756
Transparent top view
(1) This is not a supply pin. The substrate is attached
to this pad using conductive die attach material. There
is no electrical or mechanical requirement to solder this
pad.However, if it is soldered, the solder land should remain
floating or be connected to GND.
Figure 5. Pin configuration DHVQFN16
Figure 4. Pin configuration SO16 and (T)SSOP16
5.2 Pin description
Table 2. Pin description
Symbol
A0, A1, A2
E1
E2
E3
Y0, Y1, Y2, Y3, Y4, Y5, Y6, Y7
GND
V
CC
Pin
1, 2, 3
4
5
6
15, 14, 13, 12, 11, 10, 9, 7
8
16
Description
address input
enable input (active LOW)
enable input (active LOW)
enable input (active HIGH)
output (active HIGH)
ground (0 V)
supply voltage
74HC_HCT238
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2018. All rights reserved.
Product data sheet
Rev. 5 — 13 June 2018
3 / 18
Nexperia
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
6
Functional description
Table 3. Function table
H = HIGH voltage level; L = LOW voltage level; X = don’t care.
Inputs
E1
H
X
X
L
L
L
L
L
L
L
L
E2
X
H
X
L
L
L
L
L
L
L
L
E3
X
X
L
H
H
H
H
H
H
H
H
A0
X
X
X
L
H
L
H
L
H
L
H
A1
X
X
X
L
L
H
H
L
L
H
H
A2
X
X
X
L
L
L
L
H
H
H
H
Outputs
Y0
L
L
L
H
L
L
L
L
L
L
L
Y1
L
L
L
L
H
L
L
L
L
L
L
Y2
L
L
L
L
L
H
L
L
L
L
L
Y3
L
L
L
L
L
L
H
L
L
L
L
Y4
L
L
L
L
L
L
L
H
L
L
L
Y5
L
L
L
L
L
L
L
L
H
L
L
Y6
L
L
L
L
L
L
L
L
L
H
L
Y7
L
L
L
L
L
L
L
L
L
L
H
7
Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
Parameter
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
SO16, (T)SSOP16 and DHVQFN16
packages
[2]
Conditions
V
I
< -0.5 V or V
I
> V
CC
+ 0.5 V
V
O
< -0.5 V or V
O
> V
CC
+ 0.5 V
-0.5 V < V
O
< V
CC
+ 0.5 V
[1]
[1]
Min
-0.5
-
-
-
-
-50
-65
-
Max
+7
±20
±20
±25
50
-
+150
500
Unit
V
mA
mA
mA
mA
mA
°C
mW
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] For SO16 package: above 70 °C the value of P
tot
derates linearly at 8 mW/K.
For SSOP16 and TSSOP16 packages: above 60 °C the value of P
tot
derates linearly at 5.5 mW/K.
For DHVQFN16 package: above 60 °C the value of P
tot
derates linearly at 4.5 mW/K.
74HC_HCT238
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2018. All rights reserved.
Product data sheet
Rev. 5 — 13 June 2018
4 / 18
Nexperia
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
8
Recommended operating conditions
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
V
CC
V
I
V
O
T
amb
Δt/ΔV
supply voltage
input voltage
output voltage
ambient temperature
input transition rise
and fall rate
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
Conditions
Min
2.0
0
0
-40
-
-
-
74HC238
Typ
5.0
-
-
-
-
1.67
-
Max
6.0
V
CC
V
CC
+125
625
139
83
Min
4.5
0
0
-40
-
-
-
74HCT238
Typ
5.0
-
-
-
-
1.67
-
Max
5.5
V
CC
V
CC
+125
-
139
-
V
V
V
°C
ns/V
ns/V
ns/V
Unit
9
Static characteristics
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
74HC238
V
IH
HIGH-level
input voltage
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
V
IL
LOW-level
input voltage
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
V
OH
HIGH-level
V
I
= V
IH
or V
IL
output voltage
I
O
= -20 μA; V
CC
= 2.0 V
I
O
= -20 μA; V
CC
= 4.5 V
I
O
= -20 μA; V
CC
= 6.0 V
I
O
= -4.0 mA; V
CC
= 4.5 V
I
O
= -5.2 mA; V
CC
= 6.0 V
V
OL
LOW-level
V
I
= V
IH
or V
IL
output voltage
I
O
= 20 μA; V
CC
= 2.0 V
I
O
= 20 μA; V
CC
= 4.5 V
I
O
= 20 μA; V
CC
= 6.0 V
I
O
= 4.0 mA; V
CC
= 4.5 V
I
O
= 5.2 mA; V
CC
= 6.0 V
I
I
74HC_HCT238
Conditions
Min
1.5
3.15
4.2
-
-
-
1.9
4.4
5.9
25 °C
Typ
1.2
2.4
3.2
0.8
2.1
2.8
2.0
4.5
6.0
Max
-
-
-
0.5
1.35
1.8
-
-
-
-
-
0.1
0.1
0.1
0.26
0.26
±0.1
-40 °C to +85 °C -40 °C to +125 °C Unit
Min
1.5
3.15
4.2
-
-
-
1.9
4.4
5.9
3.84
5.34
-
-
-
-
-
-
Max
-
-
-
0.5
1.35
1.8
-
-
-
-
-
0.1
0.1
0.1
0.33
0.33
±1.0
Min
1.5
3.15
4.2
-
-
-
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
-
Max
-
-
-
0.5
1.35
1.8
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
±1.0
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
μA
3.98 4.32
5.48 5.81
-
-
-
-
-
-
0
0
0
0.15
0.16
-
input leakage
current
V
I
= V
CC
or GND; V
CC
= 6.0 V
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2018. All rights reserved.
Product data sheet
Rev. 5 — 13 June 2018
5 / 18
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