Document
TC74LVX138F/FT
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74LVX138F, TC74LVX138FT
3-to-8 Line Decoder
The TC74LVX138F/ FT is a high-speed CMOS 3-to-8 line decoder fabricated with silicon gate CMOS technology. Designed for use in 3-V systems, it achieves high-speed operation while maintaining the CMOS low power dissipation.
This device is suitable for low-voltage and battery operated systems.
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.
An input protection circuit ensures that 0 to 5.5V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5V to 3V 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.) (VCC = 3.3 V) • Low power dissipation: ICC = 4 μA (max) (Ta = 25°C) • Input voltage level: VIL = 0.8 V (max) (VCC = 3 V)
VIH = 2.0 V (min) (VCC = 3 V) • Power-down protection provided on all inputs • Balanced propagation delays: tpLH ∼− tpHL • Pin and function compatible with 74HC138
TC74LVX138F
TC74LVX138FT
Weight SOP16-P-300-1.27A TSSOP16-P-0044-0.65A
: 0.18 g (typ.) : 0.06 g (typ.)
Start of commercial production
1993-01
1
2014-03-01
Pin Assignment (top view)
TC74LVX138F/FT
A1 B2 C3 G2A 4 G2B 5 G1 6 Y7 7 GND 8
16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6
IEC Logic Symbol
(1) A
(2) B
(3) C
(6) G1
(4) G2A
(5) G2B
Bin/Oct
(15)
1
0
Y0
(14)
2
1
Y1
(13)
4
2
Y2
(12)
3
Y3
&
(11)
4
Y4
(10)
5
Y5
(9)
EN
6
Y6
(7)
7
Y7
(1) A
(2) B
(3) C
(6) G1
(4) G2A
(5) G2B
Dmux
0
0 G
2
7
&
EN
(15)
0
Y0
(14)
1
Y1
(13)
2
Y2
(12)
3
Y3
(11)
4
Y4
(10)
5
Y5
(9)
6
Y6
(7)
7
Y7
Truth Table
Inputs
Enable
Select
G1 G2A G2B C B A
LXXXXX
XHXXXX
XXHXXX
H
L
L
L
L
L
H
L
L
L
L
H
H
L
L
L
H
L
H
L
L
L
HH
H
L
L
H
L
L
H
L
L
H
L
H
H
L
L
H
H
L
H
L
L
H
H
H
Outputs
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
HHHHHHHH HHHHHHHH HHHHHHHH L HHHHHHH H L HHHHHH HH L HHHHH HHH L HHHH HHHH L HHH HHHHH L HH HHHHHH L H HHHHHHH L
X: Don’t care
Selected Output
None None None
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
2
2014-03-01
System Diagram
TC74LVX138F/FT
Select inputs
1 A
2 B
3 C
Enable inputs
4 G2A
5 G2B
6 G1
15 Y0
14 Y1
13 Y2
12 Y3
11 Y4
10 Y5
9 Y6
7 Y7
Data outputs
Absolute Maximum Ratings (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage range DC input voltage DC output voltage Input diode current Output diode current DC output current DC VCC/ground current Power dissipation Storage temperature
VCC VIN VOUT IIK IOK IOUT ICC PD Tstg
−0.5 to 7.0
V
−0.5 to 7.0
V
−0.5 to VCC + 0.5
V
−20
mA
±20
mA
±25
mA
±75
mA
180
mW
−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 Ranges (Note)
Characteristics
Symbol
Rating
Unit
Supply voltage Input voltage Output voltage Operating temperature Input rise and fall time
VCC VIN VOUT Topr dt/dv
2.0 to 3.6 0 to 5.5 0 to VCC −40 to 85 0 to 100
V V V °C ns/V
Note: The operating ranges must be maintained to ensure the normal operation of the device. Unused inputs must be tied to either VCC or GND.
3
2014-03-01
TC74LVX138F/FT
Electrical Characteristics
DC Characteristics
Characteristics
Input voltage
H-level L-level
H-level Output voltage
L-level
Input leakage current Quiescent supply current
Symbol
Test Condition
Ta = 25°C
Ta = −40 to 85°C Unit
VCC (V) Min Typ. Max Min Max
2.0
1.5
⎯
⎯
1.5
⎯
VIH
⎯
3.0
2.0
⎯
⎯
2.0
⎯
3.6
2.4
⎯
⎯
2.4
⎯
V
2.0
⎯
⎯
0.5
⎯
0.5
VIL
⎯
3.0
⎯
⎯
0.8
⎯
0.8
3.6
⎯
⎯
0.8
⎯
0.8
IOH = −50 μA 2.0
1.9 2.0
⎯
1.9
⎯
VOH
VIN = VIH or VIL
IOH = −50 μA
3.0
2.9 3.0
⎯
2.9
⎯
IOH = −4 mA
3.0
2.58
⎯
⎯ 2.48 ⎯
V
IOL = 50 μA
2.0
⎯
0
0.1
⎯
0.1
VOL
VIN = VIH or VIL
IOL = 50 μA
.