TC7MET138AFK
TOSHIBA CMOS Didital Integrated Circuit
Silicon Monolithic
TC7MET138AFK
3-to-8 Line Decoder
The TC7MET138AFK is an advanced high speed CMOS 3-to-8
line 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 low.
When enable input G1 is held low or either G2A or G2B is held
high, decoding function is inhibited and all outputs go high. G1,
G2A, and G2B inputs are provided to ease cascade connection
and for use as an address decoder for memory systems.
The input voltage are compatible with TTL output voltage.
Weight: 0.02 g (typ.)
This device may be used as a level converter for interfacing 3.3
V to 5 V system.
Input protection and output circuit ensure that 0 to 5.5 V can be applied to the input and output
(Note)
pins
without regard to the supply voltage. These structure prevents device destruction due to mismatched supply and
input/output voltages such as battery back up, hot board insertion, etc.
Note: V
CC
=
0 V
Features
•
•
•
•
•
•
High speed: t
pd
= 7.6 ns (typ.) (V
CC
= 5 V)
Low power dissipation: I
CC
= 4
μA
(max) (Ta = 25°C)
Compatible with TTL outputs: V
IL
= 0.8 V (max)
V
IH
= 2.0 V (min)
Power down protection is provided on all inputs and outputs.
Balanced propagation delays: t
pLH
≈
t
pHL
Pin and function compatible with the 74 series (74AC/HC/ALS/LS etc.) 138 type.
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2007-10-19
TC7MET138AFK
System Diagram
15
14
A
1
13
12
Select
inputs
B
2
11
10
C
3
9
7
Enable
inputs
G2 A
G 2B
Y0
Y1
Y2
Y3
Y4
Data
outputs
Y5
Y6
Y7
4
5
6
G1
Absolute Maximum Ratings
(Note 1)
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
−
0.5~7.0
−
0.5~7.0
−
0.5~7.0
−
0.5~V
CC
+
0.5
−
20
±
20
±
25
±
75
Unit
V
V
(Note 2)
(Note 3)
V
mA
(Note 4)
mA
mA
mA
mW
°C
180
−
65~150
Note 1: 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).
Note 2: V
CC
=
0 V
Note 3: High or low state. I
OUT
absolute maximum rating must be observed.
Note 4: V
OUT
<
GND, V
OUT
>
V
CC
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2007-10-19
TC7MET138AFK
Operating Ranges
(Note 1)
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
4.5~5.5
0~5.5
0~5.5
0~V
CC
−
40~85
Unit
V
V
(Note 2)
(Note 3)
V
°C
ns/V
0~20
Note 1: The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
Note 2: V
CC
=
0 V
Note 3: High or low state.
Electrical Characteristics
DC Characteristics
Characteristics
High level
Low level
High level
Output voltage
Low level
Input leakage current
Quiescent supply current
Output leakage current
V
OL
I
IN
I
CC
I
CCT
I
OPD
Symbol
V
IH
V
IL
V
OH
Test Condition
⎯
⎯
Ta
=
25°C
V
CC
(V)
4.5~5.5
4.5~5.5
4.5
4.5
4.5
4.5
0~5.5
5.5
5.5
0
Min
2.0
⎯
Ta
= −
40~85°C
Max
⎯
Typ.
⎯
⎯
Min
2.0
⎯
Max
⎯
Unit
Input voltage
0.8
⎯
⎯
0.8
⎯
⎯
V
V
IN
=
V
IH
I
OH
= −
50
μ
A
or V
IL
I
OH
= −
8 mA
V
IN
=
V
IH
or V
IL
I
OL
=
8 mA
V
IN
=
5.5 V or GND
V
IN
=
V
CC
or GND
Per input: V
IN
=
3.4 V
Other input: V
CC
or GND
V
OUT
=
5.5 V
I
OL
=
50
μ
A
4.4
3.94
⎯
⎯
⎯
⎯
⎯
⎯
4.5
⎯
4.4
3.80
⎯
⎯
⎯
⎯
⎯
⎯
0
⎯
⎯
⎯
⎯
⎯
0.1
0.36
±
0.1
0.1
0.44
±
1.0
V
μ
A
μ
A
4.0
1.35
0.5
40.0
1.50
5.0
mA
μ
A
AC Characteristics
(Input: t
r
=
t
f
=
3 ns)
Characteristics
Propagation delay time
(A, B, C- Y )
Propagation delay time
(G1- Y )
Propagation delay time
(
G2
- Y )
Input capacitance
Power dissipation capacitance
Symbol
t
pLH
t
pHL
t
pLH
t
pHL
t
pLH
t
pHL
C
IN
C
PD
Test Condition
Ta
=
25°C
V
CC
(V)
5.0
±
0.5
C
L
(pF)
15
50
15
50
15
50
Min
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Ta
= −
40~85°C
Max
10.4
11.4
9.1
10.1
9.6
10.6
10
⎯
Typ.
7.6
8.1
6.6
7.1
7.0
7.5
4
49
Min
1.0
1.0
1.0
1.0
1.0
1.0
⎯
⎯
Max
12.0
13.0
10.5
11.5
11.0
12.0
10
⎯
Unit
⎯
ns
⎯
5.0
±
0.5
ns
⎯
5.0
±
0.5
⎯
ns
pF
pF
(Note)
⎯
Note: C
PD
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:
I
CC (opr)
=
C
PD
½V
CC
½f
IN
+
I
CC
4
2007-10-19
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