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74VHC138 3-to-8 Decoder Demultiplexer

74VHC138 3-to-8 Decoder Demultiplexer

74VHC138 3-to-8 Decoder Demultiplexer
October 1995
74VHC138 3-to-8 Decoder Demultiplexer
General Description
The VHC138 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 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 prevents device destruction due to mismatched supply and input voltages
Features
Commercial 74VHC138M 74VHC138SJ 74VHC138MSC 74VHC138MTC 74VHC138N
Package Number M16A M16D MSC16 MTC16 N16E
Package Description 16-Lead Molded JEDEC SOIC 16-Lead Molded EIAJ SOIC 16-Lead Molded EIAJ Type I SSOP 16-Lead Molded JEDEC Type I TSSOP 16-Lead Molded DIP
Logic Symbols
IEEE IEC
Connection Diagram
Pin Assignment for DIP SSOP TSSOP and SOIC
TL F 11537-1
Description Address Inputs Enable Inputs Enable Input Outputs
C1995 National Semiconductor Corporation
TL F 11537
RRD-B30M125 Printed in U S A
Truth Table
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Absolute Maximum Ratings (Note 1)
Supply Voltage (VCC) DC Input Voltage (VIN) DC Output Voltage (VOUT) Input Diode Current (IIK) Output Diode Current (IOK) DC Output Current (IOUT) DC VCC GND Current (ICC) Storage Temperature (TSTG) Lead Temperature (TL) (Soldering 10 seconds)
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 without exception to ensure that the system design is reliable over its power supply temperature and output input loading variables National does not recommend operation outside databook specifications
Recommended Operating Conditions
Supply Voltage (VCC) Input Voltage (VIN) Output Voltage (VOUT) Operating Temperature (TOPR) 74VHC Input Rise and Fall Time (tr tf) VCC e 3 3V g 0 3V VCC e 5 0V g 0 5V 2 0V to a 5 5V 0V to a 5 5V 0V to VCC
74VHC Symbol Parameter VCC (V) Min VIH VIL VOH High Level Input Voltage Low Level Input Voltage High Level Output Voltage 20 3 0-5 5 20 3 0-5 5 20 30 45 30 45 VOL Low Level Output Voltage 20 30 45 30 45 IIN ICC Input Leakage Current Quiescent Supply Current 0-5 5 55 19 29 44 2 58 3 94 00 00 00 01 01 01 0 36 0 36
Units
Conditions
Max V V V VIN e VIH or VIL IOH e b50 mA
V VIN e VIH or VIL
AC Electrical Characteristics
74VHC Symbol Parameter VCC (V) Min tPLH tPHL Propagation Delay An to On 33 g0 3 50 g0 5 tPLH tPHL Propagation Delay E3 to On 33 g0 3 50 g0 5 tPLH tPHL Propagation Delay E1 or E2 to On 33 g0 3 50 g0 5 CIN CPD Input Capacitance Power Dissipation Capacitance TA e 25 C Typ 82 10 0 57 72 81 10 6 56 71 82 10 7 58 73 4 34 Max 11 4 15 8 81 10 1 12 8 16 3 81 10 1 11 4 14 9 81 10 1 10 74VHC TA e b40 C to a 85 C Min 10 10 10 10 10 10 10 10 10 10 10 10 Max 13 5 18 0 95 11 5 15 0 18 5 95 11 5 13 5 17 0 95 11 5 10 pF pF ns ns ns ns ns ns CL e 15 pF CL e 50 pF CL e 15 pF CL e 50 pF CL e 15 pF CL e 50 pF CL e 15 pF CL e 50 pF CL e 15 pF CL e 50 pF CL e 15 pF CL e 50 pF VCC e Open (Note 1) Units Conditions
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 ) e CPD VCC fIN a ICC
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
Physical Dimensions inches (millimeters)
16-Lead Small Outline Integrated Circuit NS Package Number M16A
JEDEC (M)
16-Lead Small Outline Package-EIAJ (SJ) NS Package Number M16D
Physical Dimensions inches (millimeters) (Continued)
16-Lead Plastic EIAJ SSOP Type I (MSC) NS Package Number MSC16
14-Lead Molded JEDEC SSOP Type I (TSSOP) NS Package Number MTC16
74VHC138 3-to-8 Decoder Demultiplexer
Physical Dimensions inches (millimeters) (Continued)
16-Lead Molded Dual-In-Line Package (MDIP) NS Package Number N16E
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National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications