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September 1983
Revised February 1999
MM74HC138 3-to-8 Line Decoder
© 1999 Fairchild Semicond uctor Corpor ation DS005120.prf www.fairchildsemi.com
MM74HC138
3-to-8 Line Decoder
General Descript ion
The MM74HC138 decoder utilizes advanced silicon-gate
CMOS technology and is well suited to memory address
decoding or data routing applications. The circuit features
high noise immunity and low power consumption usually
associated with CMOS circuitry, yet ha s speeds compar a-
ble to low power Schottky TTL logic.
The MM74H C138 has 3 binary select inp uts (A, B, an d C).
If the device is enabled, these inputs determine which one
of the eight normally HIGH outputs will go LOW. Two active
LOW and one active HIGH enables (G1, G2A and G2B)
are provided to ease the cascading of decoders.
The decoder’s outputs can drive 10 low power Schottky
TTL eq uivalent lo ads, and are function ally and pi n equiva-
lent to th e 74LS138. Al l inputs are p rotected fr om damage
due to static discharge by diodes to VCC and ground.
Features
Typical propagation delay: 20 ns
Wide power supply range: 2V–6V
Low quiescen t curre nt: 80 µA maximum (74HC Series)
Low input curre nt: 1 µA maximum
Fanout of 10 LS-TTL loads
Ordering Code:
Devices also ava ilable in Tape and R eel. Speci fy by appending suffix letter “X” to the ordering code.
Connection Diagram
Pin Assignment for DIP, SOIC, SOP a nd TSSOP
Order Number Package Number Package Description
MM74HC138M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
MM74HC138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC138MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC138N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
www.fairchildsemi.com 2
MM74HC138
Truth Table
H = HIGH Level, L = LOW Level, X = don’t care
Note 1: G2 = G2A+G2B
Logic Diagram
Inputs Outputs
Enable Select
G1 G2 (Note 1)C B A Y0Y1Y2Y3Y4Y5Y6Y7
X H XXXHHHHHHHH
L X XXXHHHHHHHH
H L LLLLHHHHHHH
H L LLHHLHHHHHH
H L LHLHHLHHHHH
H L LHHHHHLHHHH
H L HLLHHHHLHHH
H L HLHHHHHHLHH
H L HHLHHHHHHLH
H L HHHHHHHHHHL
3 www.fairchildsemi.com
MM74HC138
Absolute Maximum Ratings(Note 2)
(Note 3) Recommended Operating
Conditions
Note 2: Absolute M aximum Ra tings are those valu es beyond w hich dam-
age to the device may occur.
Note 3: Unless ot herwise specified all v olt ages are re fe renced to ground.
Note 4: Power Dis sipation te mperature d erating — pl astic “N” pa ckage:
12 mW/°C from 65°C to 85°C.
DC Electrical Characteristics (Note 5)
Note 5: For a p owe r su pp ly o f 5V ± 10% the worst case output voltages (VOH, and VOL) occu r for HC at 4.5V. Thus the 4.5V valu es sho uld be used when
designing with this supply. Worst case VIH and VIL o ccur at VCC = 5. 5V and 4.5 V respectively. (The VIH val ue at 5.5V is 3. 85V.) The worst cas e leakag e c ur-
rent (IIN, ICC, and IOZ) occ ur for CMO S at th e higher voltage and so th e 6. 0V values s hould be used.
Supply Voltage (VCC) 0.5 to + 7.0V
DC Input Voltage (VIN) 1.5 to VCC + 1.5V
DC Output Voltage (VOUT) 0.5 to VCC + 0.5V
Clamp Diode Current (IIK, IOK)± 20 mA
DC Output Current, per pin (IOUT)± 25 mA
DC VCC or GND Current, per pin (ICC)± 50 mA
Storage Temperature Range (TSTG) 65°C to + 150°C
Power Dissipation (PD)
(Note 4) 600 mW
S.O. Package only 500 mW
Lead Temperature (TL)
(Soldering 10 seconds) 260°C
Min Max Units
Supply Voltage (VCC)26V
DC Input or Output Voltage 0 VCC V
(VIN, VOUT)
Operating Temperature Range (TA)40 +85 °C
Input Rise or Fall Times
(tr, tf) VCC = 2.0V 1000 ns
VCC = 4.5V 500 ns
VCC = 6.0V 400 ns
Symbol Parameter Conditions VCC TA = 25°CT
A = 40 to 85°CUnits
Typ Guaranteed Li m its
VIH Minimum HIGH Level 2.0V 1.5 1.5 V
Input Voltage 4.5V 3.15 3.15 V
6.0V 4.2 4.2 V
VIL Maximum LOW Level 2.0V 0.5 0.5 V
Input Voltage 4.5V 1.35 1.35 V
6.0V 1.8 1.8 V
VOH Minimum HIGH Level VIN = VIH or VIL
Output Voltage | IOUT | 20 µA 2.0V 2.0 1.9 1.9 V
4.5V 4.5 4.4 4.4 V
6.0V 6.0 5.9 5.9 V
VIN = VIH or VIL
|IOUT | 4.0 mA 4.5V 4.2 3.98 3.84 V
| IOUT | 5.2 mA 6.0V 5.7 5.48 5.34 V
VOL Maximum LOW Level VIN = VIH or VIL
Output Voltage | IOUT | 20 µA 2.0V 0 0.1 0.1 V
4.5V 0 0.1 0.1 V
6.0V 0 0.1 0.1 V
VIN = VIH or VIL
| IOUT | 4.0 mA 4.5V 0.2 0.26 0.33 V
| IOUT | 5.2 mA 6.0V 0.2 0.26 0.33 V
IIN Maximum Input VIN = VCC or GND 6.0V ±0.1 ±1.0 µA
Current
ICC Maximum Quiescent VIN = VCC or GND 6.0V 8.0 80 µA
Supply Current IOUT = 0 µA
www.fairchildsemi.com 4
MM74HC138
AC Electrical Characteristics
VCC = 5V, TA = 25°C, CL = 15 pF, tr = tf = 6 ns
AC Electrical Characteristics
CL = 50 pF, tr = tf = 6 ns (unless otherwise specified)
Note 6: CPD determines t he no load dy namic powe r c onsumptio n, PD = CPD VCC2f + ICC VCC, and th e no load dyna m ic c urrent cons um ption,
IS = CPD VCC f + ICC.
Symbol Parameter Conditions Typ Guaranteed Units
Limit
tPLH Maximum Propagation 18 25 ns
Delay, Binary Select to any Output
tPHL Maximum Propagation 28 35 ns
Delay, Binary Select to any Output
tPHL, tPLH Maximum Propagation 18 25 ns
Delay, G1 to any Output
tPHL Maximum Propagation 23 30 ns
Delay G2A or G2B to
Output
tPLH Maximum Propagation 18 25 ns
Delay G2A or G2B to Output
Symbol Parameter Conditions VCC TA= 25°CT
A= 40 to 85°CUnits
Typ Guaranteed Limits
tPLH Maximum Propagation 2.0V 75 150 189 ns
Delay Binary Select to 4.5V 15 30 38 ns
any Output LOW-to-HIGH 6.0V 13 26 32 ns
tPHL Maximum Propagation 2.0V 100 200 252 ns
Delay Binary Select to any 4.5V 20 40 50 ns
Output HIGH-to-LOW 6.0V 17 34 43 ns
tPHL, tPLH Maximum Propagation 2.0V 75 150 189 ns
Delay G1 to any 4.5V 15 30 38 ns
Output 6.0V 13 26 32 ns
tPHL Maximum Propagation 2.0V 82 175 221 ns
Delay G2A or G2B to 4.5V 28 35 44 ns
Output 6.0V 22 30 37 ns
tPLH Maximum Propagation 2.0V 75 150 189 ns
Delay G2A or G2B to 4.5V 15 30 38 ns
Output 6.0V 13 26 32 ns
tTLH, tTHL Output Rise and 2.0V 30 75 95 ns
Fall Time 4.5V 8 15 19 ns
6.0V 7 13 16 ns
CIN Maximum Input 3 10 10 pF
Capacitance
CPD Power Dissipation (Note 6) 75 pF
Capacitance
5 www.fairchildsemi.com
MM74HC138
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 Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
www.fairchildsemi.com 6
MM74HC138
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.
MM74HC138 3-to-8 Line Decoder
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 syste ms
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 failu re 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/PatentMarking.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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