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Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
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November 1992
Revised April 1999
74VHC138 3-to-8 Decoder/Demultiplexer
© 1999 Fairchild Semiconductor Corporation DS011537.prf www.fairchildsemi.com
74VHC138
3-to-8 Decoder/Demultiplexer
General Descript ion
The VHC138 is an advanced high speed CMOS 3-to-8
decoder/demultiplexer fabricated with silicon gate CMOS
technolo gy. It a chieves th e high speed operation similar to
equivalent Bipolar Schottky TTL while maintaining the
CMOS low power dissipation.
When the de vice is enabled , 3 binary select i nputs (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, de coding fun ction is inhib ited and all outputs
go HIGH. E3, E1 and E2 inputs are provided to ease cas-
cade connection and for use as an address decoder for
memory systems. An input protection circuit ensures that
0V to 7V can be app lied to the inpu t pins without re gard 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 = 5.7ns (typ) at TA = 25°C
■Low power dissipation: ICC = 4 µA (max.) at TA = 25°C
■High noise immunity: VNIH = VNIL = 28% VCC (min.)
■Power down protection provided on all inputs
■Pin and function compatible with 74HC138
Ordering Code:
Surface m ount pack ages are also available on Tape and Reel. Specify by ap pending the s uffix let te r “X” to the ordering code .
Logic Symbols
IEEE/IEC
Connection Diagram
Pin Descriptions
Order Number Package Number Package Description
74VHC138M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
74VHC138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHC138MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHC138N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Pin Names Description
A0–A2Address Inputs
E1–E2Enable Inputs
E3Enable Input
O0–O7Outputs
www.fairchildsemi.com 2
74VHC138
Truth Table
H = HIGH Voltage Le ve l
L = LOW Voltage Level
X = Immaterial
Inputs Outputs
E1E2E3A0A1A2O0O1O2O3O4O5O6O7
HXXXXXHHHHHHHH
XHXXXXHHHHHHHH
XXLXXXHHHHHHHH
LLHLLLLHHHHHHH
LLHHLLHLHHHHHH
LLHLHLHHLHHHHH
LLHHHLHHHLHHHH
LLHLLHHHHHLHHH
LLHHLHHHHHHLHH
LLHLHHHHHHHHLH
LLHHHHHHHHHHHL
3 www.fairchildsemi.com
74VHC138
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions (Note 2)
Note 1: Absolute Maximum Ratings are values beyond which the device
may be da maged or ha ve its useful life impaire d. The datab ook specific a-
tions should be met, without exceptio n, to ensure that the system design is
reliable over its pow er supply, tem perature, and output/inpu t loading vari-
ables. Fairchild does not recommend operation outside databook specifica-
tions.
Note 2: Unused inputs must be held HIGH o r LOW. They ma y not float.
DC Electrical Characteristics
Supply Voltage (VCC)−0.5V to +7.0V
DC Input Voltage (VIN)−0.5V to +7.0V
DC Output Voltage (VOUT)−0.5V to VCC + 0.5V
Input Diode Current (IIK)−20 mA
Output Diode Current (IOK)±20 mA
DC Output Current (IOUT)±25 mA
DC VCC/GND Current (ICC)±75 mA
Stora ge Temperature (T STG)−65°C to +150°C
Lead Temperature (TL)
(Soldering, 10 seconds) 260°C
Supply Voltage (VCC)2.0V to +5.5V
Input Voltage (VIN)0V to +5.5V
Output Voltage (VOUT)0V to V
CC
Operating Temperature (TOPR)−40°C to +85°C
Input Rise and Fall Time (tr, tf)
VCC = 3.3V ± 0.3V 0 ∼ 100 ns/V
VCC = 5.0V ± 0.5V 0 ∼ 20 ns/V
Symbol Parameter VCC
(V)
TA = 25°CT
A = −40°C to +85°CUnits Conditions
Min Typ Max Min Max
VIH HIGH Level Input V oltag e 2.0 1.50 1.50 V
3.0 − 5.5 0.7 VCC 0.7 VCC
VIL LOW Level Input Voltage 2.0 0.50 0.50 V
3.0 − 5.5 0.3 VCC 0.3 VCC
VOH HIGH Level Output Voltage 2.0 1.9 2.0 1.9 VIN = VIH IOH = −50 µA
3.0 2.9 3.0 2.9 V or VIL
4.5 4.4 4.5 4.4
3.0 2.58 2.48 VIOH = −4 mA
4.5 3.94 3.80 IOH = −8 mA
VOL LOW Level Output Voltage 2.0 0.0 0.1 0.1 VIN = VIH IOL = 50 µA
3.0 0.0 0.1 0.1 V or VIL
4.5 0.0 0.1 0.1
3.0 0.36 0.44 VIOL = 4 mA
4.5 0.36 0.44 IOL = 8 mA
IIN Input Leakage Current 0 − 5.5 ±0.1 ±1.0 µAV
IN = 5.5V or GND
ICC Quiescent Supply Current 5.5 4.0 40.0 µAV
IN = VCC or GND
www.fairchildsemi.com 4
74VHC138
AC Electrical Characteristics
Note 3: CPD is defined as the val ue of the internal equiva lent capac it anc e which is ca lc ulated from t he operatin g c urrent consumption w it hout load. Av erage
operat ing curren t can be obtai ned by the equa t ion: ICC (opr.) = CPD * VCC * fIN + ICC.
Symbol Parameter VCC
(V)
TA = 25°CT
A = −40°C to +85°CUnits Conditions
Min Typ Max Min Max
tPLH Propagati on Delay 3.3 ± 0.3 8.2 1 1.4 1.0 13.5 ns CL = 15 pF
tPHL An to On10.0 15.8 1.0 18.0 CL = 50 pF
5.0 ± 0.5 5.7 8.1 1.0 9.5 ns CL = 15 pF
7.2 10.1 1.0 11.5 CL = 50 pF
tPLH Propagati on Delay 3.3 ± 0.3 8.1 12.8 1.0 15.0 ns CL = 15 pF
tPHL E3 to On10.6 16.3 1.0 18.5 CL = 50 pF
5.0 ± 0.5 5.6 8.1 1.0 9.5 ns CL = 15 pF
7.1 10.1 1.0 11.5 CL = 50 pF
tPLH Propagati on Delay 3.3 ± 0.3 8.2 1 1.4 1.0 13.5 ns CL = 15 pF
tPHL E1 or E2 to On10.7 14.9 1.0 17.0 CL = 50 pF
5.0 ± 0.5 5.8 8.1 1.0 9.5 ns CL = 15 pF
7.3 10.1 1.0 11.5 CL = 50 pF
CIN Input Capacitance 4 10 10 pF VCC = Open
CPD Power Dissipation 34 pF (Note 3)
Capacitance
5 www.fairchildsemi.com
74VHC138
Physical Dim ensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
Package Number M16A
16-Lead Sma ll Outline Package (SOP) EIAJ TYPE II, 5.3mm Wide
Package Number M16D
www.fairchildsemi.com 6
74VHC138
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC16
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
74VHC138 3-to-8 Decoder/Demultiplexer
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 THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life suppor t de vices o r syst ems 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
instruct ions fo r use pr ovi de d in the labe l ing, can be re a-
sonably expected to result in a significant injury to the
user.
2. A criti cal com ponen t in any compo nent o f a l ife supp ort
device or system whose failure to perform can be rea-
sonabl y e xpec ted to c ause th e fa i lure of the li fe s upp or t
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
Physical Dim ensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Package Number N16E
www.onsemi.com
1
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
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