TC74VHCT138AF/AFT/AFK
2014-03-01
1
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHCT138AF, TC74VHCT138AFT, TC74VHCT138AFK
3-to-8 Line Decoder
The TC74VHCT138 is an advanced high speed CMOS 3-to-8
LINE 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 ( 0Y to 7Y ) will go low.
When enable input G1 is held low or either 2AG or 2BG is
held high, decoding function is inhibited and all outputs go high.
G1, 2AG , and 2BG inputs are provided to ease cascade
connection and for use as an address decoder for memory
systems.
The input voltage are compatible with TTL output voltage.
This device may be used as a level converter for interfacing 3.3
V to 5 V system.
Input protection and output circuit ensure that 0 to 5.5 V can
be applied to the input and output (Note) pins without regard to
the supply voltage. These structure prevents device destruction
due to mismatched supply and input/output voltages such as
battery back up, hot board insertion, etc.
Note: VCC = 0 V
Features
• High speed: tpd = 7.6 ns (typ.) at VCC = 5 V
• Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
• Compatible with TTL inputs: VIL = 0.8 V (max)
V
IH = 2.0 V (min)
• Power down protection is provided on all inputs and outputs
• Balanced propagation delays: tpLH ≈ tpHL
• Pin and function compatible with the 74 series
(74AC/HC/F/ALS/LS etc.) 138 type.
TC74VHCT138AF
TC74VHCT138AFT
TC74VHCT138AFK
Weight
SOP16-P-300-1.27A: 0.18 g (typ.)
TSSOP16-P-0044-0.65A: 0.06 g (typ.)
VSSOP16-P-0030-0.50: 0.02 g (typ.)
Start of commercial production
1995-12
TC74VHCT138AF/AFT/AFK
2014-03-01
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Pin Assignment
IEC Logic Symbol
Truth Table
Inputs Outputs
Enable Select
G1 A2G B2G C B A
0Y 1Y 2Y 3Y 4Y 5Y 6Y 7Y
Selected
Output
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 0Y
H L L L L H H L H H H H H H 1Y
H L L L H L H H L H H H H H 2Y
H L L L H H H H H L H H H H 3Y
H L L H L L H H H H L H H H 4Y
H L L H L H H H H H H L H H 5Y
H L L H H L H H H H H H L H 6Y
H L L H H H H H H H H H H L 7Y
X: Don’t care
VCC 16
0Y
15
14
13
12
11
10
1
2
3
4
5
6
7
2BG
G1
7Y
GND 8 9
(top view)
B
C
A
1Y
2Y
3Y
4Y
5Y
6Y
2AG
7
EN
(1)
(3)
(2)
B
&
C
(6)
G1
(15)
(13)
(11)
(14)
(12)
(10)
2AG (4)
(5)
(9)
(7)
A
BIN/OCT
0Y
1Y
2Y
3Y
4Y
5Y
6Y
7Y
1
2
4
0
1
2
3
4
5
6
2BG 7
(1)
(3)
(2)
B
&
C
(6)
G1
(15)
(13)
(11)
(14)
(12)
(10)
2AG (4)
(5)
(9)
(7)
A0Y
1Y
2Y
3Y
4Y
5Y
6Y
7Y
0
2
0
1
2
3
4
5
6
2BG
7
0
G
DMUX
TC74VHCT138AF/AFT/AFK
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System Diagram
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 7.0 V
−0.5 to 7.0 (Note 2)
DC output voltage VOUT
−0.5 to VCC + 0.5 (Note 3)
V
Input diode current IIK −20 mA
Output diode current IOK ±20 (Note 4) 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 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: VCC = 0 V
Note 3: High or low state. IOUT absolute maximum rating must be observed.
Note 4: VOUT < GND, VOUT > VCC
A
B
C
1
2
3
4
5
6
Select
inputs
Enable
inputs
A2G
B2G
G1
15
Data
outputs
14 1Y
13 2Y
12
11 4Y
10
9
7 7Y
0Y
3Y
5Y
6Y
TC74VHCT138AF/AFT/AFK
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Operating Ranges (Note 1)
Characteristics Symbol Rating Unit
Supply voltage VCC 4.5 to 5.5 V
Input voltage VIN 0 to 5.5 V
0 to 5.5 (Note 2)
Output voltage VOUT 0 to VCC (Note 3)
V
Operating temperature Topr −40 to 85 °C
Input rise and fall time dt/dV 0 to 20 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: VCC = 0 V
Note 3: High or low state
Electrical Characteristics
DC Characteristics
Test Condition Ta = 25°C Ta =
−40 to 85°C
Characteristics 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
IOH = −50 μA 4.5 4.40 4.50 ― 4.40 ―
High-level output
voltage VOH VIN
= VIH or VIL IOH = −8 mA 4.5 3.94 ― ― 3.80 ―
V
IOL = 50 μA 4.5 ― 0.0 0.1 ― 0.1
Low-level output
voltage VOL VIN
= VIH or VIL IOL = 8 mA 4.5 ― ― 0.36 ― 0.44
V
Input leakage
current IIN VIN = 5.5 V or GND 0 to 5.5 ― ― ±0.1 ― ±1.0 μA
ICC VIN = VCC or GND 5.5 ― ― 4.0 ― 40.0 μA
Quiescent supply
current ICCT Per input: VIN = 3.4 V
Other input: VCC or GND 5.5 ― ― 1.35 ― 1.50 mA
Output leakage
current IOPD V
OUT = 5.5 V 0 ― ― 0.5 ― 5.0 μA
TC74VHCT138AF/AFT/AFK
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AC Characteristics (input: tr = tf = 3 ns)
Test Condition Ta = 25°C Ta = −40 to 85°C
Characteristics Symbol
VCC (V) CL (pF) Min Typ. Max Min Max
Unit
15 ― 7.6 10.4 1.0 12.0
Propagation delay
time
(A, B, C- Y)
tpLH
tpHL
― 5.0 ± 0.5
50 ― 8.1 11.4 1.0 13.0
ns
15 ― 6.6 9.1 1.0 10.5
Propagation delay
time
(G1- Y)
tpLH
tpHL
― 5.0 ± 0.5
50 ― 7.1 10.1 1.0 11.5
ns
15 ― 7.0 9.6 1.0 11.0
Propagation delay
time
(2G -Y)
tpLH
tpHL
― 5.0 ± 0.5
50 ― 7.5 10.6 1.0 12.0
ns
Input capacitance CIN ― ― 4 10 ― 10 pF
Power dissipation
capacitance CPD (Note) ― 49 ― ― ― 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
TC74VHCT138AF/AFT/AFK
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Package Dimensions
Weight: 0.18 g (typ.)
TC74VHCT138AF/AFT/AFK
2014-03-01
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Package Dimensions
Weight: 0.06 g (typ.)
TC74VHCT138AF/AFT/AFK
2014-03-01
8
Package Dimensions
Weight: 0.02 g (typ.)
TC74VHCT138AF/AFT/AFK
2014-03-01
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