TC74LVX138F/FT
2014-03-01
1
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 ( 0Y -7Y ) will go low.
When enable input G1 is held low or either A2G or 2BG is
held high, decoding function is inhibited and all outputs go high.
G1, A2G , and 2BG 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.
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)
V
IH = 2.0 V (min) (VCC = 3 V)
• Power-down protection provided on all inputs
• Balanced propagation delays: tpLH ∼
−
tpHL
• Pin and function compatible with 74HC138
TC74LVX138F
TC74LVX138FT
Weight
SOP16-P-300-1.27A : 0.18 g (typ.)
TSSOP16-P-0044-0.65A : 0.06 g (typ.)
Start of commercial production
1993-01
TC74LVX138F/FT
2014-03-01
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Pin Assignment (top view)
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
(1)
(2)
(3)
(6)
(4)
(5)
Bin/Oct
1
2
4
1
&
EN
2
0
4
5
3
6
7
A
B
C
G1
A2G
B2G
(15)
(14)
(13)
(12)
(11)
(10)
(9)
(7)
0Y
1Y
2Y
3Y
4Y
5Y
6Y
7Y
0
G7
(1)
(2)
(3)
(6)
(4)
(5)
Dmux
0
2
1
&
EN
2
0
4
5
3
6
7
A
B
C
G1
A2G
B2G
(15)
(14)
(13)
(12)
(11)
(10)
(9)
(7)
0Y
1Y
2Y
3Y
4Y
5Y
6Y
7Y
VCC
16
0Y
1Y
2Y
3Y
4Y
15
14
13
12
11
10
A1
2
3
4
5
6
7
B
C
A2G
B2G
G1
7Y 5Y
8GND 9 6Y
TC74LVX138F/FT
2014-03-01
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System Diagram
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
Output voltage VOUT 0 to VCC V
Operating temperature Topr −40 to 85 °C
Input rise and fall time dt/dv 0 to 100 ns/V
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.
A
B
C
1
2
3
4
5
6
Select
inputs
Enable
inputs
A2G
B2G
G1
15 0Y
Data
outputs
14 1Y
13 2Y
12
11 4Y
10
9
7 7Y
6Y
5Y
3Y
TC74LVX138F/FT
2014-03-01
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Electrical Characteristics
DC Characteristics
Ta = 25°C Ta =
−40 to 85°C
Characteristics Symbol Test Condition
VCC (V) Min Typ. Max Min Max
Unit
2.0 1.5 ⎯ ⎯ 1.5 ⎯
3.0 2.0 ⎯ ⎯ 2.0 ⎯
H-level VIH ⎯
3.6 2.4 ⎯ ⎯ 2.4 ⎯
2.0 ⎯ ⎯ 0.5 ⎯ 0.5
3.0 ⎯ ⎯ 0.8 ⎯ 0.8
Input voltage
L-level VIL ⎯
3.6 ⎯ ⎯ 0.8 ⎯ 0.8
V
IOH = −50 μA 2.0 1.9 2.0 ⎯ 1.9 ⎯
IOH = −50 μA 3.0 2.9 3.0 ⎯ 2.9 ⎯
H-level VOH VIN = VIH
or VIL
IOH = −4 mA 3.0 2.58 ⎯ ⎯ 2.48 ⎯
IOL = 50 μA 2.0 ⎯ 0 0.1 ⎯ 0.1
IOL = 50 μA 3.0 ⎯ 0 0.1 ⎯ 0.1
Output voltage
L-level VOL VIN = VIH
or VIL
IOL = 4 mA 3.0 ⎯ ⎯ 0.36 ⎯ 0.44
V
Input leakage current IIN VIN = 5.5 V or GND 3.6 ⎯ ⎯ ±0.1 ⎯ ±1.0 μA
Quiescent supply current ICC V
IN = VCC or GND 3.6 ⎯ ⎯ 4.0 ⎯ 40.0 μA
TC74LVX138F/FT
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AC Characteristics (input: tr = tf = 3 ns)
Ta = 25°C Ta =
−40 to 85°C
Characteristics Symbol Test Condition
VCC (V) CL (pF) Min Typ. Max Min Max
Unit
15 ⎯ 7.1 13.8 1.0 16.5
tpLH 2.7
50 ⎯ 9.6 17.3 1.0 20.0
15 ⎯ 5.5 8.8 1.0 10.5
Propagation delay time
(A, B, C- Y)
tpHL
⎯
3.3 ± 0.3
50 ⎯ 8.0 12.3 1.0 14.0
ns
15 ⎯ 8.7 16.3 1.0 19.5
tpLH 2.7
50 ⎯ 11.2 19.8 1.0 23.0
15 ⎯ 6.8 10.6 1.0 12.5
Propagation delay time
(G1- Y)
tpHL
⎯
3.3 ± 0.3
50 ⎯ 9.3 14.1 1.0 16.0
ns
15 ⎯ 8.8 16.0 1.0 18.5
tpLH 2.7
50 ⎯ 11.3 19.5 1.0 22.0
15 ⎯ 6.9 10.4 1.0 11.5
Propagation delay time
(2G -Y)
tpHL
⎯
3.3 ± 0.3
50 ⎯ 9.4 13.9 1.0 15.0
ns
2.7 50 ⎯ ⎯ 2.5 ⎯ 2.5
Output to output skew tosLH
tosHL (Note 1)
3.3 ± 0.3 50 ⎯ ⎯ 2.5 ⎯ 2.5
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:
I
CC (opr) = CPD･VCC･fIN + ICC
Noise Characteristics (Ta = 25°C, input: tr = tf = 3 ns, CL = 50 pF)
Characteristics Symbol Test Condition
VCC (V)
Typ. Limit Unit
Quiet output maximum dynamic VOL VOLP ⎯ 3.3 ⎯ 0.5 V
Quiet output minimum dynamic VOL V
OLV ⎯ 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
Input Equivalent Circuit
INPUT
TC74LVX138F/FT
2014-03-01
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Package Dimensions
Weight: 0.18 g (typ.)
TC74LVX138F/FT
2014-03-01
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Package Dimensions
Weight: 0.06 g (typ.)
TC74LVX138F/FT
2014-03-01
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