TC74VHC238F/FN/FT/FK
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74VHC238F,TC74VHC238FN,TC74VHC238FT,TC74VHC238FK
3-to-8 Line Decoder
Note:
The TC74VHC238 is an advanced high speed CMOS 3-to-8
DECODER fabricated with silicon gate C
2
MOS 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
G 2 A
or
G2B
is
held high, decoding function is inhibited and all outputs go Low.
G1
G 2 A
, and
G2B
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.
xxxFN (JEDEC SOP) is not available in
Japan.
TC74VHC238F
Features
•
•
•
•
•
•
•
High speed: t
pd
=
5.5 ns (typ.) at V
CC
=
5 V
Low power dissipation: I
CC
=
4
μA
(max) at Ta
=
25°C
High noise immunity: V
NIH
=
V
NIL
=
28% V
CC
(min)
Power down protection is provided on all inputs.
∼
Balanced propagation delays: t
pLH
−
t
pHL
Wide operating voltage range: V
CC (opr)
=
2 to 5.5 V
Pin and function compatible with 74ALS238
TC74VHC238FN
TC74VHC238FT
TC74VHC238FK
Weight
SOP16-P-300-1.27A
SOP16-P-300-1.27
SOL16-P-150-1.27
TSSOP16-P-0044-0.65A
VSSOP16-P-0030-0.50
: 0.18 g (typ.)
: 0.18 g (typ.)
: 0.13 g (typ.)
: 0.06 g (typ.)
: 0.02 g (typ.)
1
2007-01-15
TC74VHC238F/FN/FT/FK
Logic Diagram
15
14
13
12
11
10
9
7
Enable
inputs
G2 A
G 2B
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
A
1
Select
inputs
B
2
Data
outputs
C
3
4
5
6
G1
Absolute Maximum Ratings (Note)
Characteristics
Supply voltage range
DC input voltage
DC output voltage
Input diode current
Output diode current
DC output current
DC V
CC
/ground current
Power dissipation
Storage temperature
Symbol
V
CC
V
IN
V
OUT
I
IK
I
OK
I
OUT
I
CC
P
D
T
stg
Rating
−0.5
to 7.0
−0.5
to 7.0
−0.5
to V
CC
+ 0.5
−20
±20
±25
±75
180
−65
to 150
Unit
V
V
V
mA
mA
mA
mA
mW
°C
Note:
Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or
even destruction.
Operating Range (Note)
Characteristics
Supply voltage
Input voltage
Output voltage
Operating temperature
Input rise and fall time
Symbol
V
CC
V
IN
V
OUT
T
opr
dt/dv
Rating
2.0 to 5.5
0 to 5.5
0 to V
CC
−40
to 85
0 to 100 (V
CC
= 3.3 ± 0.3 V)
0 to 20 (V
CC
= 5 ± 0.5 V)
Unit
V
V
V
°C
ns/V
Note:
The operating range must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either V
CC
or GND.
3
2007-01-15
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