TL/F/11521
74VHC139 Dual 2-to-4 Decoder/Demultiplexer
October 1995
74VHC139
Dual 2-to-4 Decoder/Demultiplexer
General Description
The VHC139 is an advanced high speed CMOS 2 to 4 line
decoder/demultiplexer 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.
The active low enable input can be used for gating or it can
be used as a data input for demultiplexing applications.
When the enable input is held High, all four outputs are fixed
at a high logic level independent of the other inputs. An
input protection circuit ensures that 0V to 7V 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 pre-
vents device destruction due to mismatched supply and in-
put voltages.
Features
YLow power dissipation:
ICC e4mA (Max.) at TAe25§C
YHigh noise immunity: VNIH eVNIL e28% VCC (Min.)
YAll inputs are equipped with a power down protection
function
YBalanced propagation delays: tPLH jtPHL
YPin and function compatible with 74HC139
Commercial Package Package Description
Number
74VHC139M M16A 16-Lead Molded JEDEC SOIC
74VHC139SJ M16D 16-Lead Molded EIAJ SOIC
74VHC139MSC MSC16 16-Lead Molded EIAJ Type 1 SSOP
74VHC139MTC MTC16 16-Lead Molded JEDEC Type 1 TSSOP
74VHC139N N16E 16-Lead Molded DIP
Note: Surface mount packages are also available on Tape and Reel. Specify by appending
the suffix letter ‘‘X’’ to the ordering code.
EIAJ Type 1 SSOP available on Tape and Reel only, order MSCX.
Logic Symbols Connection Diagrams
TL/F/115211
TL/F/115214
IEEE/IEC
TL/F/115212
Pin Names Description
A0,A
1Address Inputs
EEnable Inputs
O0–O3Outputs
Pin Assignment for DIP,
SSOP, TSSOP and SOIC
TL/F/115213
C1995 National Semiconductor Corporation RRD-B30M125/Printed in U. S. A.
Functional Description
The ’VHC139 is a high-speed dual 2-to-4 decoder/demulti-
plexer. The device has two independent decoders, each of
which accepts two binary weighted inputs (A0–A1) and pro-
vides four mutually exclusive active-LOW outputs (O0–O3).
Each decoder has an active-LOW enable (E). When E is
HIGH all outputs are forced HIGH. The enable can be used
as the data input for a 4-output demultiplexer application.
Each half of the ’VHC139 generates all four minterms of two
variables. These four minterms are useful in some applica-
tions, replacing multiple gate functions as shown in
Figure 1
,
and thereby reducing the number of packages required in a
logic network.
TL/F/115218
FIGURE 1. Gate Functions (Each Half)
Truth Table
Inputs Outputs
E A0A1O0O1O2O3
HXXHHHH
LLL LHHH
LHLHLHH
LLHHHLH
LHHHHHL
H
e
HIGH Voltage Level
LeLOW Voltage Level
XeImmaterial
Logic Diagram
TL/F/115219
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
2
Absolute Maximum Ratings (Note 1)
Supply Voltage (VCC)b0.5V to a7.0V
DC Input Voltage (VIN)b0.5V to a7.0V
DC Output Voltage (VOUT)b0.5V to VCC a0.5V
Input Diode Current (IIK)b20 mA
Output Diode Current (IOK)g20 mA
DC Output Current (IOUT)g25 mA
DC VCC/GND Current (ICC)g75 mA
Storage Temperature (TSTG)b65§Ctoa
150§C
Lead Temperature (TL)
(Soldering, 10 sec.) 260§C
Note 1:
Absolute Maximum Ratings are values beyond
which the device may be damaged or have its useful life
impaired. The databook specifications should be met, with-
out exception, to ensure that the the system design is reli-
able over its power supply, temperature, and output/input
loading variables. National does not recommend operation
outside databook specifications.
Recommended Operating
Conditions
Supply Voltage (VCC) 2.0V to a5.5V
Input Voltage (VIN)0Vto
a
5.5V
Output Voltage (VOUT) 0VtoV
CC
Operating Temperature (TOPR)
74VHC b40§Ctoa
85§C
Input Rise and Fall Time (tr,t
f
)
V
CC e3.3V g0.3V 0 E100 ns/V
VCC e5.0V g0.5V 0 E20 ns/V
DC Characteristics for ’VHC Family Devices
Symbol Parameter VCC
(V)
74VHC 74VHC
Units Conditions
TAe25§CTAeb
40§C
to a85§C
Min Typ Max Min Max
VIH High Level Input 2.0 1.50 1.50 V
Voltage 3.0 5.5 0.7 VCC 0.7 VCC
VIL Low Level Input 2.0 0.50 0.50 V
Voltage 3.0 5.5 0.3 VCC 0.3 VCC
VOH High Level Output 2.0 1.9 2.0 1.9 VIN eVIH IOH eb
50 mA
Voltage 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 eb
4mA
4.5 3.94 3.80 IOH eb
8mA
V
OL Low Level Output 2.0 0.0 0.1 0.1 VIN eVIH IOL e50 mA
Voltage 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 e4mA
4.5 0.36 0.44 IOL e8mA
I
IN Input Leakage 0 5.5 g0.1 g1.0 mAVIN e5.5V or GND
Current
ICC Quiescent Supply 5.5 4.0 40.0 mAVIN eVCC or GND
Current
3
AC Electrical Characteristics
Symbol Parameter VCC
(V)
74VHC 74VHC
Units Conditions
TAe25§CTAeb
40§C
to a85§C
Min Typ Max Min Max
tPLH, Propagation Delay 3.3 g0.3 7.2 11.0 1.0 13.0 ns CLe15 pF
tPHL Anto On9.7 14.5 1.0 16.5 CLe50 pF
5.0 g0.5 5.0 7.2 1.0 8.5 ns CLe15 pF
6.5 9.2 1.0 10.5 CLe50 pF
tPLH, Propagation Delay 3.3 g0.3 6.4 9.2 1.0 11.0 ns CLe15 pF
tPHL Ento On8.9 12.7 1.0 14.5 CLe50 pF
5.0 g0.5 4.4 6.3 1.0 7.5 ns CLe15 pF
5.9 8.3 1.0 9.5 CLe50 pF
CIN Input Capacitance 4 10 10 pF VCC eOpen
CPD Power Dissipation 26 pF (Note 1)
Capacitance
Note 1: 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.) eCPD *VCC *fIN aICC/2 (per decoder).
4
Ordering Information
The device number is used to form part of a simplified purchasing code, where the package type and temperature range are
defined as follows:
TL/F/1152111
5
Physical Dimensions inches (millimeters)
16-Lead Small Outline Integrated Circuit JEDEC SOIC (M)
NS Package Number M16A
16-Lead PlasticÐEIAJ SOIC (SJ)
NS Package Number M16D
6
Physical Dimensions millimeters (Continued)
16-Lead Plastic EIAJ SSOP Type I (MSC)
NS Package Number MSC16
16-Lead Molded JEDEC Type I TSSOP
NS Package Number MTC16
7
74VHC139 Dual 2-to-4 Decoder/Demultiplexer
Physical Dimensions inches (millimeters) (Continued)
16-Lead Molded Dual In-Line Package
NS Package Number N16E
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failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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