TC74LVX138F/FT
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74LVX138F,TC74LVX138FT
3-to-8 Line Decoder
The TC74LVX138F/ FT is a high-speed CMOS 3-to-8 line
decoder fabricated with silicon gate CMOS technology. Designed
for use in 3-V systems, it achieves high-speed operation while
maintaining the CMOS low power dissipation.
This device is suitable for low-voltage and battery operated
systems.
When the device is enabled, 3 Binary Select inputs (A, B and
C) determine which one of the outputs ( Y 0 - Y7 ) will go low.
When enable input G1 is held low or either G 2 A or G2B is
held high, decoding function is inhibited and all outputs go high.
G1, G 2 A , 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 5.5V can be
applied to the input pins without regard to the supply voltage.
This device can be used to interface 5V to 3V systems and two
supply systems such as battery back up. This circuit prevents
device destruction due to mismatched supply and input voltages.
TC74LVX138F
TC74LVX138FT
Features
•
High-speed: tpd = 5.5 ns (typ.) (VCC = 3.3 V)
•
Low power dissipation: ICC = 4 μA (max) (Ta = 25°C)
•
Input voltage level: VIL = 0.8 V (max) (VCC = 3 V)
VIH = 2.0 V (min) (VCC = 3 V)
•
•
Power-down protection provided on all inputs
∼ tpHL
Balanced propagation delays: tpLH −
•
Pin and function compatible with 74HC138
Weight
SOP16-P-300-1.27A
TSSOP16-P-0044-0.65A
1
: 0.18 g (typ.)
: 0.06 g (typ.)
2012-02-29
TC74LVX138F/FT
Pin Assignment (top view)
A
1
16
VCC
B
2
15
Y0
C
3
14
Y1
G2 A
4
13
Y2
G 2B
5
12
Y3
G1
6
11
Y4
Y7
7
10
Y5
GND
8
9
Y6
IEC Logic Symbol
A
B
C
G1
G2 A
G2B
Bin/Oct
(1)
(2)
(3)
(6)
(4)
1
2
4
0
1
&
4
5
2
3
EN
(5)
6
(15)
(14)
Y1
(13)
(12)
(11)
Y2
(1)
(2)
(3)
Dmux
0
2
0
1
0
G
7
2
3
4
5
Y3
Y4
(10)
(9)
Y6
G1
G2 A
Y7
G2B
Y5
(7)
7
A
B
C
Y0
(6)
(4)
&
EN
(5)
6
7
(15)
(14)
(13)
(12)
(11)
(10)
(9)
(7)
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Truth Table
Inputs
Enable
Outputs
Select
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
H
H
H
H
H
H
H
H
Selected Output
G1
G2 A
G2B
C
B
A
L
X
X
X
X
X
X
H
X
X
X
X
H
H
H
H
H
H
H
H
None
X
X
H
X
X
X
H
H
H
H
H
H
H
H
None
H
L
L
L
L
L
L
H
H
H
H
H
H
H
Y0
H
L
L
L
L
H
H
L
H
H
H
H
H
H
Y1
H
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
None
X: Don’t care
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TC74LVX138F/FT
System Diagram
15
14
A
1
13
12
Select
inputs
B
2
11
10
C
3
9
7
G2 A
Enable
inputs
G 2B
G1
4
Y0
Y1
Y2
Y3
Y4
Data
outputs
Y5
Y6
Y7
5
6
Absolute Maximum Ratings (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage range
VCC
−0.5 to 7.0
V
DC input voltage
VIN
−0.5 to 7.0
V
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
Symbol
Rating
Unit
Supply voltage
VCC
2.0 to 3.6
V
Input voltage
VIN
0 to 5.5
V
VOUT
0 to VCC
V
Operating temperature
Topr
−40 to 85
°C
Input rise and fall time
dt/dv
0 to 100
ns/V
Output voltage
Note: 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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TC74LVX138F/FT
Electrical Characteristics
DC Characteristics
Characteristics
H-level
Symbol
VIH
⎯
Input voltage
L-level
H-level
VIL
VOH
Output voltage
⎯
IOH = −50 μA
VIN = VIH
IOH = −50 μA
or VIL
IOH = −4 mA
IOL = 50 μA
L-level
VOL
Ta = −40 to
85°C
Ta = 25°C
Test Condition
VCC (V)
Min
Typ.
Max
Min
Max
2.0
1.5
⎯
⎯
1.5
⎯
3.0
2.0
⎯
⎯
2.0
⎯
3.6
2.4
⎯
⎯
2.4
⎯
2.0
⎯
⎯
0.5
⎯
0.5
3.0
⎯
⎯
0.8
⎯
0.8
3.6
⎯
⎯
0.8
⎯
0.8
2.0
1.9
2.0
⎯
1.9
⎯
3.0
2.9
3.0
⎯
2.9
⎯
3.0
2.58
⎯
⎯
2.48
⎯
2.0
⎯
0
0.1
⎯
0.1
VIN = VIH
IOL = 50 μA
or VIL
IOL = 4 mA
3.0
⎯
0
0.1
⎯
0.1
3.0
⎯
⎯
0.36
⎯
0.44
Unit
V
V
Input leakage current
IIN
VIN = 5.5 V or GND
3.6
⎯
⎯
±0.1
⎯
±1.0
μA
Quiescent supply current
ICC
VIN = VCC or GND
3.6
⎯
⎯
4.0
⎯
40.0
μA
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2012-02-29
TC74LVX138F/FT
AC Characteristics (input: tr = tf = 3 ns)
Characteristics
Symbol
VCC (V)
tpLH
Propagation delay time
Propagation delay time
Min
Typ.
Max
Min
Max
15
⎯
7.1
13.8
1.0
16.5
50
⎯
9.6
17.3
1.0
20.0
15
⎯
5.5
8.8
1.0
10.5
50
⎯
8.0
12.3
1.0
14.0
15
⎯
8.7
16.3
1.0
19.5
50
⎯
11.2
19.8
1.0
23.0
15
⎯
6.8
10.6
1.0
12.5
50
⎯
9.3
14.1
1.0
16.0
15
⎯
8.8
16.0
1.0
18.5
50
⎯
11.3
19.5
1.0
22.0
15
⎯
6.9
10.4
1.0
11.5
50
⎯
9.4
13.9
1.0
15.0
2.7
50
⎯
⎯
2.5
⎯
2.5
3.3 ± 0.3
50
⎯
⎯
2.5
⎯
2.5
2.7
tpHL
3.3 ± 0.3
tpLH
2.7
⎯
(G1- Y )
Propagation delay time
tpHL
3.3 ± 0.3
tpLH
2.7
⎯
( G2 - Y )
Output to output skew
CL (pF)
⎯
(A, B, C- Y )
3.3 ± 0.3
tpHL
tosLH
tosHL
(Note 1)
Ta = −40 to
85°C
Ta = 25°C
Test Condition
Unit
ns
ns
ns
ns
Input capacitance
CIN
(Note 2)
⎯
4
10
⎯
10
pF
Power dissipation capacitance
CPD
(Note 3)
⎯
34
⎯
⎯
⎯
pF
Note 1: Parameter guaranteed by design.
(tosLH = |tpLHm − tpLHn|, tosHL = |tpHLm − tpHLn|)
Note 2: Parameter guaranteed by design.
Note 3: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption.
Average operating current can be obtained by the equation:
ICC (opr) = CPD･VCC･fIN + ICC
Noise Characteristics (Ta = 25°C, input: tr = tf = 3 ns, CL = 50 pF)
Characteristics
Limit
Symbol
Test Condition
Quiet output maximum dynamic VOL
VOLP
⎯
3.3
⎯
0.5
V
Quiet output minimum dynamic VOL
VOLV
⎯
3.3
⎯
−0.5
V
Minimum high level dynamic input voltage VIH
VIHD
⎯
3.3
⎯
2.0
V
Maximum low level dynamic input voltage VIL
VILD
⎯
3.3
⎯
0.8
V
VCC (V)
Typ.
Unit
Input Equivalent Circuit
INPUT
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2012-02-29
TC74LVX138F/FT
Package Dimensions
Weight: 0.18 g (typ.)
6
2012-02-29
TC74LVX138F/FT
Package Dimensions
Weight: 0.06 g (typ.)
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2012-02-29
TC74LVX138F/FT
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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• PRODUCT IS NEITHER INTENDED NOR WARRANTED FOR USE IN EQUIPMENTS OR SYSTEMS THAT REQUIRE
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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