TC74LCX138F/FT/FK
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74LCX138F,TC74LCX138FT,TC74LCX138FK
Low-Voltage 3-to-8 Line Decoder with 5-V Tolerant Inputs and Outputs
The TC74LCX138 is a high-performance CMOS 3-to-8 decoder.
Designed for use in 3.3-V systems, it achieves high-speed
operation while maintaining the CMOS low-power dissipation.
The device is designed for low-voltage (3.3 V) VCC applications,
but it could be used to interface to 5-V supply environment for
inputs.
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.
All inputs are equipped with protection circuits against static
discharge.
TC74LCX138F
TC74LCX138FT
Features
•
Low-voltage operation: VCC = 1.65 to 3.6 V
•
High-speed operation: tpd = 6.0 ns (max) (VCC = 3.0 to 3.6 V)
•
Ouput current: |IOH|/IOL = 24 mA (min) (VCC = 3.0 V)
•
Latch-up performance: ＞±500 mA
•
Available in JEITA SOP, TSSOP and VSSOP (US)
•
Power-down protection provided on all inputs and outputs
•
Pin and function compatible with the 74 series
(74AC/VHC/HC/F/ALS/LS etc.) 138 type
TC74LCX138FK
W
WeIght
SOP16-P-300-1.27A
TSSOP16-P-0044-0.65A
VSSOP16-P-0030-0.50
: 0.18 g (typ.)
: 0.06 g (typ.)
: 0.02 g (typ.)
Note: The Electrical Characteristics of VCC=1.8±0.15V is only applicable for products which manufactured
from January 2009 onward.
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TC74LCX138F/FT/FK
Pin Assignment (top view)
A
1
16
VCC
B
2
15
Y0
C
3
14
Y1
G2A
4
13
Y2
G 2B
5
12
Y3
G1
6
11
Y4
Y7
7
10
Y5
GND
8
9
Y6
IEC Logic Symbol
Bin/Oct
A
B
C
G1
G2A
G2B
(1)
(2)
0
1
2
1
2
4
(3)
(6)
3
4
5
&
(4)
(5)
6
7
EN
(15)
(14)
(13)
(12)
(11)
(10)
(9)
(7)
Y1
A
B
Y2
C
Y0
Y3
Y4
G1
Y5
G2A
Y6
G2B
(1)
(2)
Dmux
0
(3)
0
G
7
2
(6)
0
1
2
3
4
5
&
(4)
(5)
6
7
Y7
(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
Selected Output
G1
G2 A
G 2B
C
B
A
L
X
X
X
X
X
H
H
H
H
H
H
H
H
None
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
X: Don’t care
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TC74LCX138F/FT/FK
System Diagram
15
A
14
1
13
Select
inputs
B
12
2
11
C
10
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 1)
Characteristics
Symbol
Rating
Unit
Power supply voltage
VCC
−0.5 to 7.0
V
DC input voltage
VIN
−0.5 to 7.0
V
−0.5 to 7.0 (Note 2)
DC output voltage
VOUT
Input diode current
IIK
−50
Output diode current
IOK
±50
DC output current
IOUT
±50
mA
Power dissipation
PD
180
mW
ICC/IGND
±100
mA
Tstg
−65 to 150
°C
DC VCC/ground current
Storage temperature
−0.5 to VCC + 0.5
(Note 3)
V
mA
(Note 4)
mA
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 range (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: VCC = 0 V
Note 3: High or low state. IOUT absolute maximum rating must be observed.
Note 4: VOUT < GND, VOUT > VCC
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TC74LCX138F/FT/FK
Operating Ranges (Note 1)
Characteristics
Symbol
Power supply voltage
VCC
Input voltage
VIN
Output voltage
VOUT
Output current
IOH/IOL
Rating
Unit
1.65 to 3.6
1.5 to 3.6 (Note 2)
0 to 5.5
V
0 to 5.5 (Note 3)
0 to VCC (Note 4)
±24
(Note 5)
±12
(Note 6)
Operating temperature
Topr
−40 to 85
Input rise and fall time
dt/dv
0 to 10
V
V
mA
°C
(Note 7)
ns/V
Note 1: The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
Note 2: Data retention only
Note 3: VCC = 0 V
Note 4: High or low state
Note 5: VCC = 3.0 to 3.6 V
Note 6: VCC = 2.7 to 3.0 V
Note 7: VIN = 0.8 to 2.0 V, VCC = 3.0 V
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TC74LCX138F/FT/FK
Electrical Characteristics
DC Characteristics (Ta = −40 to 85°C)
Characteristics
H-level
Symbol
Test Condition
1.7
⎯
2.7 to 3.6
2.0
⎯
1.65 to 2.3
⎯
VCC×0.1
2.3 to 2.7
⎯
0.7
2.7 to 3.6
⎯
0.8
1.65 to 3.6
VCC−0.2
⎯
IOH = −4 mA
1.65
1.05
⎯
IOH = −8 mA
2.3
1.7
⎯
IOH = −12 mA
2.7
2.2
⎯
IOH = −18 mA
3.0
2.4
⎯
IOH = −24 mA
3.0
2.2
⎯
IOL = 100 μA
1.65 to 3.6
⎯
0.2
IOL = 4 mA
1.65
⎯
0.45
IOL = 8 mA
2.3
⎯
0.7
IOL = 12 mA
2.7
⎯
0.4
IOL = 16 mA
3.0
⎯
0.4
IOL = 24 mA
3.0
⎯
0.55
1.65 to 3.6
⎯
±5.0
μA
VIN/VOUT = 5.5 V
0
⎯
10.0
μA
VIN = VCC or GND
1.65 to 3.6
⎯
10.0
VIN = 3.6 to 5.5 V
1.65 to 3.6
⎯
±10.0
VIH = VCC − 0.6 V
2.7 to 3.6
⎯
500
⎯
VIL
VIN = VIH or VIL
Output voltage
L-level
Input leakage current
VOL
IIN
Power-off leakage current
IOFF
Quiescent supply current
ICC
Increase in Icc per input
ΔICC
Unit
2.3 to 2.7
⎯
VIH
VOH
Max
⎯
IOH = −100 μA
H-level
Min
1.65 to 2.3 VCC×0.9
Input voltage
L-level
VCC (V)
VIN = VIH or VIL
VIN = 0 to 5.5 V
5
V
V
μA
2012-02-29
TC74LCX138F/FT/FK
AC Characteristics (Ta = −40 to 85°C)
Characteristics
Propagation delay time
(A, B, C- Y )
Symbol
tpLH
tpHL
Propagation delay time
tpLH
(G1- Y )
tpHL
Propagation delay time
tpLH
( G2 - Y )
tpHL
Output to output skew
Note:
Test Condition
Figure 1, Figure 2
Figure 1, Figure 2
Figure 1, Figure 2
tosLH
(Note)
tosHL
Min
Max
1.8±0.15
⎯
25.0
2.5±0.2
⎯
8.0
2.7
⎯
7.0
3.3 ± 0.3
1.5
6.0
1.8±0.15
⎯
25.0
2.5±0.2
⎯
9.0
2.7
⎯
8.0
3.3 ± 0.3
1.5
7.0
1.8±0.15
⎯
25.0
2.5±0.2
⎯
8.0
2.7
⎯
7.0
3.3 ± 0.3
1.5
6.0
2.7
⎯
⎯
3.3 ± 0.3
⎯
1.0
VCC (V)
Unit
ns
ns
ns
ns
Parameter guaranteed by design.
(tosLH = |tpLHm − tpLHn|, tosHL = |tpHLm − tpHLn|)
Dynamic Switching Characteristics (Ta = 25°C, input: tr = tf = 2.5 ns, CL = 50 pF, RL = 500 Ω)
Characteristics
Symbol
Test Condition
VCC (V)
Typ.
Unit
Quiet output maximum dynamic VOL
VOLP
VIH = 3.3 V, VIL = 0 V
3.3
0.8
V
Quiet output minimum dynamic VOL
|VOLV|
VIH = 3.3 V, VIL = 0 V
3.3
0.8
V
Typ.
Unit
7
pF
0
8
pF
3.3
25
pF
Capacitive Characteristics (Ta = 25°C)
Characteristics
Input capacitance
Output capacitance
Power dissipation capacitance
Note:
Symbol
Test Condition
CIN
⎯
3.3
⎯
COUT
CPD
VCC (V)
fIN = 10 MHz
(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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TC74LCX138F/FT/FK
AC Test Circuit
Output
RL
CL
Measure
Figure 1
AC Waveform
tf
tr
VIH
90%
VIM
10%
Input
GND
VOH
VOM
Output
tpLH
tpHL
VOL
Figure 2 tpLH, tpHL
VCC
Symbol
3.3 ± 0.3 V
2.7V
Input
2.5 ± 0.2 V
1.8 ± 0.15 V
VIH
2.7V
VCC
VCC
VIM
1.5V
VCC/2
VCC/2
tr,tf
2.5ns
2.0ns
2.0ns
Output
VOM
1.5V
VOH/2
VOH/2
Load
CL
50pF
30pF
30pF
RL
500Ω
500Ω
1kΩ
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TC74LCX138F/FT/FK
Package Dimensions
Weight: 0.18 g (typ.)
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TC74LCX138F/FT/FK
Package Dimensions
Weight: 0.06 g (typ.)
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TC74LCX138F/FT/FK
Package Dimensions
Weight: 0.02 g (typ.)
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TC74LCX138F/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.
• This document and any information herein may not be reproduced without prior written permission from TOSHIBA. Even with
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
APPLICATIONS.
• PRODUCT IS NEITHER INTENDED NOR WARRANTED FOR USE IN EQUIPMENTS OR SYSTEMS THAT REQUIRE
EXTRAORDINARILY HIGH LEVELS OF QUALITY AND/OR RELIABILITY, AND/OR A MALFUNCTION OR FAILURE OF WHICH
MAY CAUSE LOSS OF HUMAN LIFE, BODILY INJURY, SERIOUS PROPERTY DAMAGE AND/OR SERIOUS PUBLIC IMPACT
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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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Please use Product in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances,
including without limitation, the EU RoHS Directive. TOSHIBA ASSUMES NO LIABILITY FOR DAMAGES OR LOSSES
OCCURRING AS A RESULT OF NONCOMPLIANCE WITH APPLICABLE LAWS AND REGULATIONS.
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