TC74VHC238F/FK
2019-01-31
1
© 2015-2019
Toshiba Electronic Devices & Storage Corporation
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHC238F, TC74VHC238FK
3-to-8 Line Decoder
The TC74VHC238 is an advanced high speed CMOS 3-to-8 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 (Y0-Y7) will go High.
When enable input G1 is held low or either
A2G
or
2B
G
is held high,
decoding function is inhibited and all outputs go Low.
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 5.5 V can be applied to the
input pins without regard to the supply voltage. This device can be used to
interface 5 to 3 V 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.) at VCC = 5 V
Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
High noise immunity: VNIH = VNIL = 28% VCC (min)
Power down protection is provided on all inputs.
Balanced propagation delays: tpLH
∼
−
tpHL
Wide operating voltage range: VCC (opr) = 2 to 5.5 V
Pin and function compatible with 74ALS238
TC74VHC238FK
Weight
SOP16
-P-300-1.27A : 0.18 g (typ.)
VSSOP16-P-0030-0.50 : 0.02 g (typ.)
Start of commercial production
1991-11
TC74VHC238F/FK
2019-01-31
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© 2015-2019
Toshiba Electronic Devices & Storage Corporation
Pin Assignment
IEC Logic Symbol
Truth Table
Inputs Outputs
Selected
Output
Enable Select
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
G1
A2G
B2G
C B A
L X X X X X L L L L L L L L None
X H X X X X L L L L L L L L None
X X H X X X L L L L L L L L None
H L L L L L H L L L L L L L Y0
H L L L L H L H L L L L L L Y1
H L L L H L L L H L L L L L Y2
H L L L H H L L L H L L L L Y3
H L L H L L L L L L H L L L Y4
H L L H L H L L L L L H L L Y5
H L L H H L L L L L L L H L Y6
H L L H H H L L L L L L L H Y7
X: Don’t care
VCC
16
Y0
15
14
13
12
11
10
1
2
3
4
5
6
7
G1
Y7
GND
8
9
(top view)
B
C
A
Y1
Y2
Y3
Y4
Y5
Y6
7
EN
(1)
(3)
(2)
B
&
C
(6)
G1
(15)
(13)
(11)
(14)
(12)
(10)
(4)
(5)
(9)
(7)
A
BIN/OCT
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
1
2
4
0
1
2
3
4
5
6
7
(1)
(3)
(2)
B
&
C
(6)
G1
(15)
(13)
(11)
(14)
(12)
(10)
(4)
(5)
(9)
(7)
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
1
2
0
1
2
3
4
5
6
DMUX
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© 2015-2019
Toshiba Electronic Devices & Storage Corporation
Logic Diagram
Absolute Maximum Ratings (Note)
Characteristics Symbol Rating Unit
Supply voltage range VCC −0.5 to 7.0 V
DC input voltage V
IN
−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 I
OUT
±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 Range (Note)
Characteristics Symbol Rating Unit
Supply voltage VCC 2.0 to 5.5 V
Input voltage VIN 0 to 5.5 V
Output voltage VOUT 0 to VCC V
Operating temperature T
opr
−40 to 85 °C
Input rise and fall time dt/dv 0 to 100 (VCC = 3.3 ± 0.3 V)
0 to 20 (V
CC
= 5 ± 0.5 V) ns/V
Note: The operating range 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
G1
15
1
4
1
3
1
2
1
1
1
0
9
7
Data
outputs
Y1
Y2
Y4
Y7
Y0
Y3
Y5
Y6
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Toshiba Electronic Devices & Storage Corporation
Electrical Characteristics
DC Characteristics
Characteristics Symbol
Test Condition Ta = 25°C
Ta = −40 to
85°C
Unit
VCC (V) Min Typ. Max Min Max
High-level input
voltage VIH ― 2.0
3.0 to 5.5
1.50
VCC ×
0.7
―
―
―
―
1.50
VCC ×
0.7
―
― V
Low-level input
voltage VIL ― 2.0
3.0 to 5.5
―
―
―
―
0.50
VCC ×
0.3
―
―
0.50
VCC ×
0.3
V
High-level output
voltage VOH VIN
= VIH or VIL
IOH = −50 μA
2.0
3.0
4.5
1.9
2.9
4.4
2.0
3.0
4.5
―
―
―
1.9
2.9
4.4
―
―
― V
IOH = −4 mA
IOH = −8 mA
3.0
4.5
2.58
3.94
―
―
―
―
2.48
3.80
―
―
Low-level output
voltage VOL VIN
= VIH or VIL
IOL = 50 μA
2.0
3.0
4.5
―
―
―
0.0
0.0
0.0
0.1
0.1
0.1
―
―
―
0.1
0.1
0.1 V
IOL = 4 mA
IOL = 8 mA
3.0
4.5
―
―
―
―
0.36
0.36
―
―
0.44
0.44
Input leakage
current IIN VIN = 5.5 V or GND 0 to 5.5 ― ― ±0.1 ― ±1.0 μA
Quiescent supply
current ICC VIN = VCC or GND 5.5 ― ― 4.0 ― 40.0 μA
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Toshiba Electronic Devices & Storage Corporation
AC Characteristics (input: tr = tf = 3 ns)
Characteristics Symbol
Test Condition Ta = 25°C
Ta = −40 to
85°C
Unit
VCC (V) CL (pF) Min Typ. Max Min Max
Propagation delay
time
(A, B, C-Y)
tpLH
tpHL
―
3.3 ± 0.3
15 ― 8.0 12.3 1.0 14.5
ns
50 ― 10.5 15.8 1.0 18.0
5.0 ± 0.5
15 ― 5.5 8.1 1.0 9.5
50 ― 7.0 10.1 1.0 11.5
Propagation delay
time
(G1-Y)
tpLH
tpHL
―
3.3 ± 0.3
15 ― 8.1 12.8 1.0 15.0
ns
50 ― 10.6 16.3 1.0 18.5
5.0 ± 0.5
15 ― 5.4 8.1 1.0 9.5
50 ― 6.9 10.1 1.0 11.5
Propagation delay
time
(
2G
-Y)
tpLH
tpHL
―
3.3 ± 0.3
15 ― 8.1 12.3 1.0 14.5
ns
50 ― 10.6 15.8 1.0 18.0
5.0 ± 0.5
15 ― 5.7 8.1 1.0 9.5
50 ― 7.2 10.1 1.0 11.5
Input capacitance CIN ― ― 4 10 ― 10 pF
Power dissipation
capacitance CPD (Note)
― 37 ― ― ― 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
Input Equivalent Circuit
INPUT
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© 2015-2019
Toshiba Electronic Devices & Storage Corporation
Package Dimensions
Weight: 0.18 g (typ.)
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© 2015-2019
Toshiba Electronic Devices & Storage Corporation
Package Dimensions
Weight: 0.02 g (typ.)
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© 2015-2019
Toshiba Electronic Devices & Storage Corporation
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