TC74ACT138P/F/FT
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74ACT138P,TC74ACT138F, TC74ACT138FT
3-to-8 Line Decoder
The TC74ACT138 is an advanced high speed CMOS 3-to-8
LINE DECODER fabricated with silicon gate and double-layer
metal wiring C2MOS technology.
It achieves the high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low power
dissipation.
This device may be used as a level converter for interfacing
TTL or NMOS to High Speed CMOS. The inputs are compatible
with TTL, NMOS and CMOS output voltage levels.
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.
All inputs are equipped with protection circuits against static
discharge or transient excess voltage.
TC74ACT138P
Features
TC74ACT138FT
•
TC74ACT138F
High speed: tpd = 6.0 ns (typ.) at VCC = 5 V
•
Low power dissipation: ICC = 8 μA (max) at Ta = 25°C
•
Compatible with TTL outputs: VIL = 0.8 V (max)
VIH = 2.0 V (min)
•
Symmetrical output impedance: |IOH| = IOL = 24 mA (min)
•
Capability of driving 50 Ω
transmission lines.
∼ tpHL
Balanced propagation delays: tpLH −
•
Pin and function compatible with 74F138
1
Weight
DIP16-P-300-2.54A
SOP16-P-300-1.27A
TSSOP16-P-0044-0.65A
: 1.00 g (typ.)
: 0.18 g (typ.)
: 0.06 g (typ.)
2012-02-29
TC74ACT138P/F/FT
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
G2B
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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2012-02-29
TC74ACT138P/F/FT
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 1)
Characteristics
Symbol
Rating
Unit
Supply voltage range
VCC
−0.5 to 7.0
V
DC input voltage
VIN
−0.5 to VCC + 0.5
V
DC output voltage
VOUT
−0.5 to VCC + 0.5
V
Input diode current
IIK
±20
mA
Output diode current
IOK
±50
mA
DC output current
IOUT
±50
mA
DC VCC/ground current
ICC
±200
mA
Power dissipation
PD
500 (DIP) (Note 2)/180 (SOP/TSSOP)
mW
Storage temperature
Tstg
−65 to 150
°C
Note 1: 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).
Note 2: 500 mW in the range of Ta = −40 to 65°C. From Ta = 65 to 85°C a derating factor of −10 mW/°C should be
applied up to 300 mW.
Operating Ranges (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage
VCC
4.5 to 5.5
V
Input voltage
VIN
0 to VCC
V
VOUT
0 to VCC
V
Operating temperature
Topr
−40 to 85
°C
Input rise and fall time
dt/dV
0 to 10
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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2012-02-29
TC74ACT138P/F/FT
Electrical Characteristics
DC Characteristics
Test Condition
Characteristics
Ta = −40 to
85°C
Ta = 25°C
Symbol
VCC
(V)
Min
Typ.
Max
Min
Max
Unit
High-level input
voltage
VIH
―
4.5
to
5.5
2.0
―
―
2.0
―
V
Low-level input
voltage
VIL
―
4.5
to
5.5
―
―
0.8
―
0.8
V
4.5
4.4
4.5
―
4.4
―
High-level output
voltage
VOH
4.5
3.94
―
―
3.80
―
5.5
―
―
―
3.85
―
4.5
―
0.0
0.1
―
0.1
4.5
―
―
0.36
―
0.44
5.5
―
―
―
―
1.65
Low-level output
voltage
Input leakage
current
Quiescent supply
current
Note:
VOL
IOH = −50 μA
VIN
= VIH or IOH = −24 mA
VIL
IOH = −75 mA
(Note)
IOL = 50 μA
VIN
= VIH or IOL = 24 mA
VIL
IOL = 75 mA
(Note)
V
V
IIN
VIN = VCC or GND
5.5
―
―
±0.1
―
±1.0
μA
ICC
VIN = VCC or GND
5.5
―
―
8.0
―
80.0
μA
5.5
―
―
1.35
―
1.5
mA
Ta = −40 to
85°C
Unit
IC
Per input: VIN = 3.4 V
Other input: VCC or GND
This spec indicates the capability of driving 50 Ω transmission lines.
One output should be tested at a time for a 10 ms maximum duration.
AC Characteristics (CL = 50 pF, RL = 500 Ω, input: tr = tf = 3 ns)
Characteristics
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
Note:
Test Condition
Ta = 25°C
VCC (V)
Min
Typ.
Max
Min
Max
―
5.0 ± 0.5
―
6.7
10.1
1.0
11.5
ns
―
5.0 ± 0.5
―
6.8
10.5
1.0
12.0
ns
―
5.0 ± 0.5
―
6.9
11.0
1.0
12.5
ns
―
5
10
―
10
pF
―
55
―
―
―
pF
―
(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
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2012-02-29
TC74ACT138P/F/FT
Package Dimensions
Weight: 1.00 g (typ.)
5
2012-02-29
TC74ACT138P/F/FT
Package Dimensions
Weight: 0.18 g (typ.)
6
2012-02-29
TC74ACT138P/F/FT
Package Dimensions
Weight: 0.06 g (typ.)
7
2012-02-29
TC74ACT138P/F/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.
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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
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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
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2012-02-29