TC74VHC238FK [TOSHIBA]
3-to-8 Line Decoder; 3至8行译码器
| 型号： | TC74VHC238FK |
| 厂家： | 
TOSHIBA |
| 描述： | 3-to-8 Line Decoder |
| 文件： | 总10页 (文件大小：266K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC74VHC238F/FN/FT/FK
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHC238F,TC74VHC238FN,TC74VHC238FT,TC74VHC238FK
3-to-8 Line Decoder
Note: xxxFN (JEDEC SOP) is not available in
Japan.
The TC74VHC238 is an advanced high speed CMOS 3-to-8
DECODER fabricated with silicon gate C2MOS technology.
TC74VHC238F
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 G2A or G2B is
held high, decoding function is inhibited and all outputs go Low.
G1 G2A , and G2B inputs are provided to ease cascade
connection and for use as an address decoder for memory
TC74VHC238FN
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
TC74VHC238FT
•
•
•
•
•
•
•
High speed: t = 5.5 ns (typ.) at V
= 5 V
pd
CC
Low power dissipation: I
= 4 μA (max) at Ta = 25°C
CC
High noise immunity: V
= V
= 28% V
(min)
NIH
NIL
CC
Power down protection is provided on all inputs.
∼
−
Balanced propagation delays: t
t
pHL
pLH
Wide operating voltage range: V
= 2 to 5.5 V
CC (opr)
Pin and function compatible with 74ALS238
TC74VHC238FK
Weight
SOP16-P-300-1.27A
SOL16-P-150-1.27
: 0.18 g (typ.)
: 0.13 g (typ.)
TSSOP16-P-0044-0.65A : 0.06 g (typ.)
VSSOP16-P-0030-0.50
: 0.02 g (typ.)
1
2007-10-01
TC74VHC238F/FN/FT/FK
Pin Assignment
A
B
C
1
2
3
4
5
6
7
8
16
V
CC
15 Y0
14 Y1
13 Y2
12 Y3
11 Y4
10 Y5
G2A
G2B
G1
Y7
GND
9
Y6
(top view)
IEC Logic Symbol
BIN/OCT
DMUX
(15)
(1)
(2)
(3)
(15)
(1)
(2)
(3)
A
B
C
1
2
4
0
1
2
3
4
5
6
7
Y0
A
B
C
1
2
0
1
2
3
4
5
6
7
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
0
7
(14)
(13)
(12)
(11)
(10)
(9)
(14)
(13)
(12)
(11)
(10)
(9)
Y1
Y2
Y3
Y4
Y5
Y6
Y7
G
&
&
(6)
(4)
(5)
(6)
(4)
(5)
G1
G2A
G2B
G1
G2A
G2B
EN
(7)
(7)
Truth Table
Inputs
Outputs
Selected
Output
Enable
Select
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
G1
L
G2A
X
H
X
L
G2B
X
X
H
L
C
X
X
X
L
B
X
X
X
L
A
X
X
X
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
L
L
L
H
None
None
None
Y0
X
X
H
H
H
H
H
H
H
H
L
L
L
L
H
L
Y1
L
L
L
H
H
L
Y2
L
L
L
H
L
Y3
L
L
H
H
H
H
Y4
L
L
L
H
L
Y5
L
L
H
H
Y6
L
L
H
Y7
X: Don’t care
2
2007-10-01
TC74VHC238F/FN/FT/FK
Logic Diagram
15
Y0
14
Y1
1
2
3
A
B
C
13
Y2
12
Y3
Select
inputs
Data
outputs
11
10
9
Y4
Y5
Y6
Y7
7
4
5
6
G2A
G2B
G1
Enable
inputs
Absolute Maximum Ratings (Note)
Characteristics
Supply voltage range
Symbol
Rating
Unit
V
−0.5 to 7.0
−0.5 to 7.0
V
V
CC
DC input voltage
V
IN
DC output voltage
Input diode current
Output diode current
DC output current
V
−0.5 to V
+ 0.5
V
OUT
CC
I
−20
mA
mA
mA
mA
mW
°C
IK
I
±20
±25
OK
I
OUT
DC V /ground current
CC
I
±75
CC
Power dissipation
P
180
D
Storage temperature
T
−65 to 150
stg
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
Input voltage
V
2.0 to 5.5
0 to 5.5
V
V
CC
V
IN
Output voltage
V
0 to V
V
OUT
CC
−40 to 85
0 to 100 (V = 3.3 ± 0.3 V)
Operating temperature
T
°C
opr
CC
0 to 20 (V
Input rise and fall time
dt/dv
ns/V
= 5 ± 0.5 V)
CC
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.
3
2007-10-01
TC74VHC238F/FN/FT/FK
Electrical Characteristics
DC Characteristics
Ta = −40 to
Test Condition
Ta = 25°C
85°C
Characteristics
Symbol
Unit
V
(V)
CC
Min
Typ.
Max
Min
Max
2.0
1.50
1.50
―
―
―
―
―
―
High-level input
voltage
3.0
to
5.5
V
―
―
V
V
IH
V
×
V
×
CC
0.7
CC
0.7
2.0
0.50
0.50
―
―
―
―
―
―
Low-level input
voltage
3.0
to
5.5
V
IL
V
×
V
×
CC
0.3
CC
0.3
2.0
3.0
4.5
3.0
4.5
2.0
3.0
4.5
3.0
4.5
1.9
2.9
4.4
2.58
3.94
―
2.0
3.0
4.5
―
―
―
1.9
2.9
4.4
2.48
3.80
―
―
―
I
= −50 μA
OH
V
IN
= V or
IL
High-level output
voltage
V
―
―
V
V
OH
IH
V
I
I
= −4 mA
= −8 mA
―
―
OH
―
―
―
OH
0.0
0.0
0.0
―
0.1
0.1
0.1
0.36
0.36
0.1
0.1
0.1
0.44
0.44
I
= 50 μA
―
―
OL
V
IN
IH
IL
Low-level output
voltage
V
= V or
V
―
―
OL
I
I
= 4 mA
= 8 mA
―
―
OL
―
―
―
OL
Input leakage
current
0 to
5.5
I
V
V
= 5.5 V or GND
―
―
―
―
±0.1
4.0
―
―
±1.0
40.0
μA
μA
IN
IN
IN
Quiescent supply
current
I
= V
or GND
CC
5.5
CC
4
2007-10-01
TC74VHC238F/FN/FT/FK
AC Characteristics (input: t = t = 3 ns)
r
f
Ta = −40 to
Test Condition
(V)
Ta = 25°C
85°C
Characteristics
Symbol
Unit
V
C (pF)
L
Min
―
―
―
―
―
―
―
―
―
―
―
―
―
Typ.
8.0
10.5
5.5
7.0
8.1
10.6
5.4
6.9
8.1
10.6
5.7
7.2
4
Max
12.3
15.8
8.1
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
―
Max
14.5
18.0
9.5
CC
15
50
15
50
15
50
15
50
15
50
15
50
3.3 ± 0.3
5.0 ± 0.5
3.3 ± 0.3
5.0 ± 0.5
3.3 ± 0.3
Propagation delay
time
t
pLH
―
―
―
ns
ns
ns
t
pHL
(A, B, C-Y)
10.1
12.8
16.3
8.1
11.5
15.0
18.5
9.5
Propagation delay
time
t
t
pLH
pHL
(G1-Y)
10.1
12.3
15.8
8.1
11.5
14.5
18.0
9.5
Propagation delay
time
t
t
pLH
pHL
( G2 -Y)
5.0 ± 0.5
10.1
―
11.5
10
Input capacitance
C
―
pF
pF
IN
Power dissipation
capacitance
C
PD
(Note)
―
37
―
―
―
Note: C
is defined as the value of the internal equivalent capacitance which is calculated from the operating
PD
current consumption without load.
Average operating current can be obtained by the equation:
I
= C ·V ·f + I
PD CC IN CC
CC (opr)
Input Equivalent Circuit
INPUT
5
2007-10-01
TC74VHC238F/FN/FT/FK
Package Dimensions
Weight: 0.18 g (typ.)
6
2007-10-01
TC74VHC238F/FN/FT/FK
Package Dimensions (Note)
Note:
This package is not available in Japan.
Weight: 0.13 g (typ.)
7
2007-10-01
TC74VHC238F/FN/FT/FK
Package Dimensions
Weight: 0.06 g (typ.)
8
2007-10-01
TC74VHC238F/FN/FT/FK
Package Dimensions
Weight: 0.02 g (typ.)
9
2007-10-01
TC74VHC238F/FN/FT/FK
RESTRICTIONS ON PRODUCT USE
20070701-EN GENERAL
• The information contained herein is subject to change without notice.
• TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor
devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical
stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of
safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of
such TOSHIBA products could cause loss of human life, bodily injury or damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as
set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and
conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability
Handbook” etc.
• The TOSHIBA products listed in this document are intended for usage in general electronics applications
(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,
etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires
extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or
bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or
spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his
document shall be made at the customer’s own risk.
• The products described in this document shall not be used or embedded to any downstream products of which
manufacture, use and/or sale are prohibited under any applicable laws and regulations.
• The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which
may result from its use. No license is granted by implication or otherwise under any patents or other rights of
TOSHIBA or the third parties.
• Please contact your sales representative for product-by-product details in this document regarding RoHS
compatibility. Please use these products in this document in compliance with all applicable laws and regulations
that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses
occurring as a result of noncompliance with applicable laws and regulations.
10
2007-10-01
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