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74VHCT138A 3-to-8 Decoder/Demultiplexer
May 2007
74VHCT138A 3-to-8 Decoder/Demultiplexer
Features
High Speed: tPD = 7.6ns (Typ.) at VCC = 5V Low power dissipation: ICC = 4A (Max.) at TA = 25C Power down protection is provided on all inputs and
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General Description
The VHCT138A is an advanced high speed CMOS 3-to-8 DECODER fabricated with silicon gate CMOS 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 (A0, A1 and A2) determine which one of the outputs (O0-O7) will go LOW. When enable input E3 is held LOW or either E1 or E2 is held HIGH, decoding function is inhibited and all outputs go HIGH. E3, E1 and E2 inputs are provided to ease cascade connection and for use as an address decoder for memory systems. Protection circuits ensure that 0V to 7V can be applied to the input pins without regard to the supply voltage and to the output pins with VCC = 0V. These circuits prevent device destruction due to mismatched supply and input/output voltages. This device can be used to interface 3V to 5V systems and two supply systems such as battery backup.
outputs Pin and function compatible with 74HCT138
Ordering Information
Order Number
74VHCT138AM 74VHCT138ASJ 74VHCT138AMTC
Package Number
M16A M16D MTC16
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter "X" to the ordering number.
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com
74VHCT138A 3-to-8 Decoder/Demultiplexer
Connection Diagram
Logic Symbols
IEEE/IEC
Pin Description
Pin Names
A0-A2 E1-E2 E3 O0-O7
Description
Address Inputs Enable Inputs Enable Input Outputs
Truth Table
Inputs E1
H X X L L L L L L L L
Outputs A1
X X X L L H H L L H H
E2
X H X L L L L L L L L
E3
X X L H H H H H H H H
A0
X X X L H L H L H L H
A2
X X X L L L L H H H H
O0
H H H L H H H H H H H
O1
H H H H L H H H H H H
O2
H H H H H L H H H H H
O3
H H H H H H L H H H H
O4
H H H H H H H L H H H
O5
H H H H H H H H L H H
O6
H H H H H H H H H L H
O7
H H H H H H H H H H L
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 2
74VHCT138A 3-to-8 Decoder/Demultiplexer
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 3
74VHCT138A 3-to-8 Decoder/Demultiplexer
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
Symbol
VCC VIN VOUT Supply Voltage DC Input Voltage DC Output Voltage Note 1 Note 2 IIK IOK IOUT ICC TSTG TL Input Diode Current Output Diode Current(3) DC Output Current DC VCC / GND Current Storage Temperature
Parameter
Rating
-0.5V to +7.0V -0.5V to +7.0V -0.5V to 7.0V -0.5V to VCC + 0.5V -20mA 20mA 25mA 75mA -65C to +150C 260C
Lead Temperature (Soldering, 10 seconds)
Recommended Operating Conditions(4)
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings.
Symbol
VCC VIN VOUT Supply Voltage Input Voltage Output Voltage Note 1 Note 2 TOPR t r, t f Notes: 1. VCC = 0V. Operating Temperature
Parameter
Rating
4.5V to +5.5V 0V to +5.5V 0V to 5.5V 0V to VCC -40C to +85C 0 20ns/V
Input Rise and Fall Time, VCC = 5.0V 0.5V
2. HIGH or LOW state. IOUT absolute maximum rating must be observed. 3. VOUT < GND, VOUT > VCC (Outputs Active). 4. Unused inputs must be held HIGH or LOW. They may not float.
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 4
74VHCT138A 3-to-8 Decoder/Demultiplexer
DC Electrical Characteristics
TA = 25C Symbol
VIH VIL VOH VOL IIN ICC ICCT IOFF
TA = -40C to +85C
2.0 0.8 0.8 4.4 3.80 0.1 0.1 0.44 1.0 20.0 1.50 5.0 A A mA A V V V V
Parameter
HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Leakage Current Quiescent Supply Current Maximum ICC / Input Output Leakage Current
VCC (V)
4.5 - 5.5 4.5 - 5.5 4.5 4.5 0 - 5.5 5.5 5.5 0
Conditions
Min.
2.0
Typ. Max. Min. Max. Units
VIN = VIH IOH = -50A or VIL IOH = -8mA VIN = VIH IOL = 50A or VIL IOL = 8mA VIN = 5.5V or GND VIN = VCC or GND VIN = 3.4V, All other inputs = VCC or GND VOUT = 5.5V
4.4 3.94
4.5 0.0
0.36 0.1 4.0 1.35 0.5
AC Electrical Characteristics
TA = 25C Symbol
tPLH, tPHL tPLH, tPHL tPLH, tPHL CIN CPD
TA = -40C to +85C Max.
10.4 11.4 9.1 10.1 9.6 10.6 10
Parameter
Propagation Delay, An to On Propagation Delay, E3 to On Propagation Delay, E1 or E2 to On Input Capacitance Power Dissipation Capacitance
VCC (V)
Conditions
CL = 50pF
Min.
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
Units
ns ns ns pF pF
5.0 0.5 CL = 15pF 5.0 0.5 CL = 15pF CL = 50pF 5.0 0.5 CL = 15pF CL = 50pF VCC (5) = Open
Note: 5. 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
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 5
74VHCT138A 3-to-8 Decoder/Demultiplexer
Physical Dimensions
Dimensions are in millimeters unless otherwise noted.
Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Package Number M16A
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 6
74VHCT138A 3-to-8 Decoder/Demultiplexer
Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted.
Figure 2. 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 7
74VHCT138A 3-to-8 Decoder/Demultiplexer
Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted.
5.000.10 4.55 5.90 4.45 7.35
0.65
4.40.1
1.45
5.00 0.11
12
MTC16rev4
Figure 3. 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 8
74VHCT138A 3-to-8 Decoder/Demultiplexer
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DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD'S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Preliminary Product Status Formative or In Design First Production Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only.
Rev. I27
2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
No Identification Needed
Full Production
Obsolete
Not In Production
(c)1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 9

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