TC74VHC238F/FT/FK
2015-10-20
1
TOS HIB A CMO S Digit a l Int egr at ed Cir c uit Silicon M on o lith ic
TC74VHC238F, TC74VHC238FT, 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
2BG
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
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.)
TC74VHC238F
TC74VHC238FT
TC74VHC238FK
St art of commercial production
1991-11
TC74VHC238F/FT/FK
2015-10-20
2
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
2BG
G1
Y7
GND
8
9
(top view)
B
C
A
Y1
Y2
Y3
Y4
Y5
Y6
2AG
7
EN
(1)
(3)
(2)
B
&
C
(6)
G1
(15)
(13)
(11)
(14)
(12)
(10)
2AG
(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
2BG
7
(1)
(3)
(2)
B
&
C
(6)
G1
(15)
(13)
(11)
(14)
(12)
(10)
2AG
(4)
(5)
(9)
(7)
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
1
2
0
1
2
3
4
5
6
2BG
7
0
G
DMUX
TC74VHC238F/FT/FK
2015-10-20
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Logic 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 V
OUT
−0.5 to V
CC
+ 0.5 V
Input diode current IIK −20 mA
Output diode current IOK ±20 mA
DC output current I
OUT
±25 mA
DC V
CC
/ground current I
CC
±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 V
CC
2.0 to 5.5 V
Input volt age 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 (VCC = 3.3 ± 0.3 V)
0 to 2 0 (V
CC
= 5 ± 0.5 V) ns/V
Note: The operating range must be maint ai ned 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
14
13
12
11
10
9
7
Data
outputs
Y1
Y2
Y4
Y7
Y0
Y3
Y5
Y6
TC74VHC238F/FT/FK
2015-10-20
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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 V IL
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 V IL
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 o r G ND 5.5 ― ― 4.0 ― 40.0 μA
TC74VHC238F/FT/FK
2015-10-20
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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
TC74VHC238F/FT/FK
2015-10-20
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Package Dimensions
Weight: 0.18 g (typ.)
TC74VHC238F/FT/FK
2015-10-20
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Package Dimensions
Weight: 0.06 g (typ.)
TC74VHC238F/FT/FK
2015-10-20
8
Package Dimensions
Weight : 0.02 g (typ.)
TC74VHC238F/FT/FK
2015-10-20
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