TC74VHC138F/FT/FK
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74VHC138F,TC74VHC138FT,TC74VHC138FK
3-to-8 Line Decoder
The TC74VHC138 is an advanced high speed CMOS 3-to-8
DECODER fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low power
dissipation.
When the device is enabled, 3 Binary Select inputs (A, B and C)
determine which one of the outputs ( Y0 - Y7 ) will go low.
When enable input G1 is held low or either G2A or G2B is held
high, decoding function is inhibited and all outputs go high.
G1, G2A , and G2B inputs are provided to ease cascade
connection and for use as an address decoder for memory
systems.
An input protection circuit ensures that 0 to 5.5 V can be
applied to the input pins without regard to the supply voltage.
This device can be used to interface 5 V to 3 V systems and two
supply systems such as battery back up. This circuit prevents
device destruction due to mismatched supply and input voltages.
TC74VHC138F
TC74VHC138FT
Features
TC74VHC138FK
•
High speed: tpd = 5.7 ns (typ.) at VCC = 5 V
•
Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
•
High noise immunity: VNIH = VNIL = 28% VCC (min)
•
•
Power down protection is provided on all inputs.
Balanced propagation delays: tpLH ∼
− tpHL
•
Wide operating voltage range: VCC (opr) = 2 V to 5.5 V
•
Pin and function compatible with 74ALS138
Weight
SOP16-P-300-1.27A
TSSOP16-P-0044-0.65A
VSSOP16-P-0030-0.50
1
: 0.18 g (typ.)
: 0.06 g (typ.)
: 0.02 g (typ.)
2012-02-29
TC74VHC138F/FT/FK
Pin Assignment
A
1
16
VCC
B
2
15
Y0
C
3
14
Y1
G2A
4
13
Y2
G2B
5
12
Y3
G1
6
11
Y4
Y7
7
10
Y5
GND
8
9
Y6
(top view)
IEC Logic Symbol
A
B
C
G1
G2A
G2B
(1)
(2)
(3)
(6)
(4)
(5)
BIN/OCT
1
2
4
(15)
(14)
0
1
(13)
(12)
(11)
2
3
4
&
(10)
5
6
EN
(9)
(7)
7
Y0
Y1
A
B
Y2
C
Y3
Y4
G1
Y5
Y6
Y7
G2A
G2B
(1)
(2)
DMUX
0
(3)
0
G
7
2
(13)
(12)
(11)
2
3
4
&
(6)
(4)
(5)
(15)
(14)
0
1
(10)
5
6
7
(9)
(7)
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Truth Table
Inputs
Outputs
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Selected
Output
X
H
H
H
H
H
H
H
H
None
X
X
H
H
H
H
H
H
H
H
None
X
X
H
H
H
H
H
H
H
H
None
L
L
L
L
H
H
H
H
H
H
H
Y0
L
L
L
H
H
L
H
H
H
H
H
H
Y1
L
L
L
H
L
H
H
L
H
H
H
H
H
Y2
H
L
L
L
H
H
H
H
H
L
H
H
H
H
Y3
H
L
L
H
L
L
H
H
H
H
L
H
H
H
Y4
H
L
L
H
L
H
H
H
H
H
H
L
H
H
Y5
H
L
L
H
H
L
H
H
H
H
H
H
L
H
Y6
H
L
L
H
H
H
H
H
H
H
H
H
H
L
Y7
Enable
Select
G1
G2 A
G 2B
C
B
A
L
X
X
X
X
X
H
X
X
X
X
H
X
H
L
L
H
L
H
X: Don’t care
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TC74VHC138F/FT/FK
Logic Diagram
15
A
Y0
14
1
Y1
13
Select
inputs
B
Y2
12
2
Y3
11
C
Y4
10
3
Y5
9
Y6
7
G2 A
Enable
inputs
G 2B
G1
Data
outputs
Y7
4
5
6
Absolute Maximum Ratings (Note)
Characteristics
Supply voltage range
DC input voltage
Symbol
Rating
Unit
VCC
−0.5 to 7.0
V
V
VIN
−0.5 to 7.0
DC output voltage
VOUT
−0.5 to VCC + 0.5
V
Input diode current
IIK
−20
mA
Output diode current
IOK
±20
mA
DC output current
IOUT
±25
mA
DC VCC/ground current
ICC
±75
mA
Power dissipation
PD
180
mW
Storage temperature
Tstg
−65 to 150
°C
Note:
Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or
even destruction.
Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
significant change in temperature, etc.) may cause this product to decrease in the reliability significantly
even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute
maximum ratings and the operating ranges.
Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/“Derating Concept and Methods”) and individual reliability data (i.e. reliability test
report and estimated failure rate, etc).
Operating Ranges (Note)
Characteristics
Supply voltage
Input voltage
Output voltage
Operating temperature
Input rise and fall time
Note:
Symbol
Rating
Unit
VCC
2.0 to 5.5
V
VIN
0 to 5.5
V
VOUT
0 to VCC
V
−40 to 85
°C
Topr
dt/dv
0 to 100 (VCC = 3.3 ± 0.3 V)
0 to 20 (VCC = 5 ± 0.5 V)
ns/V
The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
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TC74VHC138F/FT/FK
Electrical Characteristics
DC Characteristics
Test Condition
Characteristics
High-level input
voltage
Low-level input
voltage
Symbol
VIH
VIL
VCC
(V)
Min
Typ.
Max
Min
Max
2.0
1.50
―
―
1.50
―
3.0
to
5.5
VCC ×
0.7
―
―
VCC ×
0.7
―
2.0
―
―
0.50
―
0.50
3.0
to
5.5
―
―
VCC ×
0.3
―
VCC ×
0.3
2.0
1.9
2.0
―
1.9
―
3.0
2.9
3.0
―
2.9
―
4.5
4.4
4.5
―
4.4
―
IOH = −4 mA
3.0
2.58
―
―
2.48
―
IOH = −8 mA
4.5
3.94
―
―
3.80
―
2.0
―
0.0
0.1
―
0.1
3.0
―
0.0
0.1
―
0.1
4.5
―
0.0
0.1
―
0.1
IOL = 4 mA
3.0
―
―
0.36
―
0.44
IOL = 8 mA
4.5
―
―
0.36
―
0.44
―
―
IOH = −50 μA
High-level output
voltage
VOH
VIN = VIH or VIL
IOL = 50 μA
Low-level output
voltage
VOL
Ta = −40 to
85°C
Ta = 25°C
VIN = VIH or VIL
Unit
V
V
V
V
Input leakage
current
IIN
VIN = 5.5 V or GND
0 to
5.5
―
―
±0.1
―
±1.0
μA
Quiescent supply
current
ICC
VIN = VCC or GND
5.5
―
―
4.0
―
40.0
μA
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TC74VHC138F/FT/FK
AC Characteristics (input: tr = tf = 3 ns)
Characteristics
Test Condition
Symbol
Propagation delay
time
tpLH
(A, B, C- Y )
tpHL
Propagation delay
time
tpLH
(G1- Y )
tpHL
Propagation delay
time
tpLH
( G2 - Y )
tpHL
Input capacitance
CIN
Power dissipation
capacitance
CPD
VCC (V)
3.3 ± 0.3
―
5.0 ± 0.5
3.3 ± 0.3
―
5.0 ± 0.5
3.3 ± 0.3
―
5.0 ± 0.5
Ta = −40 to 85°C
Ta = 25°C
Unit
CL (pF)
Min
Typ.
Max
Min
Max
15
―
8.2
11.4
1.0
13.5
50
―
10.0
15.8
1.0
18.0
15
―
5.7
8.1
1.0
9.5
50
―
7.2
10.1
1.0
11.5
15
―
8.1
12.8
1.0
15.0
50
―
10.6
16.3
1.0
18.5
15
―
5.6
8.1
1.0
9.5
50
―
7.1
10.1
1.0
11.5
15
―
8.2
11.4
1.0
13.5
50
―
10.7
14.9
1.0
17.0
15
―
5.8
8.1
1.0
9.5
50
―
7.3
10.1
1.0
11.5
―
4
10
―
10
pF
―
34
―
―
―
pF
―
(Note)
ns
ns
ns
Note: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
ICC (opr) = CPD·VCC·fIN + ICC
Input Equivalent Circuit
INPUT
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2012-02-29
TC74VHC138F/FT/FK
Package Dimensions
Weight: 0.18 g (typ.)
6
2012-02-29
TC74VHC138F/FT/FK
Package Dimensions
Weight: 0.06 g (typ.)
7
2012-02-29
TC74VHC138F/FT/FK
Package Dimensions
Weight: 0.02 g (typ.)
8
2012-02-29
TC74VHC138F/FT/FK
RESTRICTIONS ON PRODUCT USE
• Toshiba Corporation, and its subsidiaries and affiliates (collectively "TOSHIBA"), reserve the right to make changes to the information
in this document, and related hardware, software and systems (collectively "Product") without notice.
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TOSHIBA's written permission, reproduction is permissible only if reproduction is without alteration/omission.
• Though TOSHIBA works continually to improve Product's quality and reliability, Product can malfunction or fail. Customers are
responsible for complying with safety standards and for providing adequate designs and safeguards for their hardware, software and
systems which minimize risk and avoid situations in which a malfunction or failure of Product could cause loss of human life, bodily
injury or damage to property, including data loss or corruption. Before customers use the Product, create designs including the
Product, or incorporate the Product into their own applications, customers must also refer to and comply with (a) the latest versions of
all relevant TOSHIBA information, including without limitation, this document, the specifications, the data sheets and application notes
for Product and the precautions and conditions set forth in the "TOSHIBA Semiconductor Reliability Handbook" and (b) the
instructions for the application with which the Product will be used with or for. Customers are solely responsible for all aspects of their
own product design or applications, including but not limited to (a) determining the appropriateness of the use of this Product in such
design or applications; (b) evaluating and determining the applicability of any information contained in this document, or in charts,
diagrams, programs, algorithms, sample application circuits, or any other referenced documents; and (c) validating all operating
parameters for such designs and applications. TOSHIBA ASSUMES NO LIABILITY FOR CUSTOMERS' PRODUCT DESIGN OR
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limitation, equipment used in nuclear facilities, equipment used in the aerospace industry, medical equipment, equipment used for
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2012-02-29