| FeaturesWhen the device is enabled, 3 binary select inputs (A , A0 1 High Speed: t = 5.7ns (typ) at T = 25°CPD Aand A ) determine which one of the outputs (O –O ) will go2 0 7 Low power dissipation: I = 4 μA (max.) at T = 25°CLOW. When enable input E is held LOW or either E or E CC A3 1 2is held HIGH, decoding function is inhibited and all outputs High noise immunity: V = V = 28% V (min.)NIH NIL CCgo HIGH. E , E and E inputs are provided to ease cas-3 1 2 Power down protection provided on all inputscade connection and for use as an address decoder for Pin and function compatible with 74HC138memory systems. An input protection circuit ensures that Ordering Code: Order Number Package Number Package Description74VHC138M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow74VHC138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide74VHC138MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide74VHC138N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” WideSurface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.Logic Symbols Connection DiagramIEEE/IECPin DescriptionsPin Names DescriptionA –A Address Inputs0 2E –E Enable Inputs1 2E Enable Input3O –O Outputs0 7 1999 Fairchild Semiconductor Corporation DS011537.prf Truth TableInputs OutputsE E E A A A O O O O O O O O1 2 3 0 1 2 0 1 2 3 4 5 6 7H X X X X X HHH HHH HHX H X X X X HHH HHH HHX X L X X X HHH HHH HHLL H LLL L H H H H H H HL L H H L L H L H HHH HHL L H L H L HH L HHH HHL L HH H L H H H L H HH HL L H L L H HHH H L H H HL L H H L H HHH HH L H HL L H L HH HHH HHH L HL L H HHH HHH HHH H LH = HIGH Voltage LevelL = LOW Voltage LevelX = Immaterial 274VHC13874VHC138 Absolute Maximum Ratings(Note 1) Recommended Operating Conditions (Note 2)Supply Voltage (V ) - 0.5V to +7.0VCCDC Input Voltage (V ) - 0.5V to +7.0V Supply Voltage (V )2.0V to +5.5VIN CCDC Output Voltage (V ) - 0.5V to V + 0.5V Input Voltage (V )0V to +5.5VOUT CC INInput Diode Current (I ) - 20 mA Output Voltage (V )0V to VIK OUT CCOutput Diode Current (I ) ±20 mA Operating Temperature (T ) - 40°C to +85°COK OPRDC Output Current (I ) ±25 mA Input Rise and Fall Time (t , t )OUT r fDC V /GND Current (I ) ±75 mA V = 3.3V ± 0.3V 0 ~ 100 ns/VCC CC CCStorage Temperature (T ) - 65°C to +150°C V = 5.0V ± 0.5V 0 ~ 20 ns/VSTG CCNote 1: Absolute Maximum Ratings are values beyond which the deviceLead Temperature (T )Lmay be damaged or have its useful life impaired. The databook specifica-(Soldering, 10 seconds) 260°Ctions should be met, without exception, to ensure that the system design isreliable over its power supply, temperature, and output/input loading vari-ables. Fairchild does not recommend operation outside databook specifica-tions.Note 2: Unused inputs must be held HIGH or LOW. They may not float.DC General Descriptionthe supply voltage. This device can be used to interface 5VThe VHC138 is an advanced high speed CMOS 3-to-8to 3V systems and two supply systems such as batterydecoder/demultiplexer fabricated with silicon gate CMOSback up. This circuit prevents device destruction due totechnology. It achieves the high speed operation similar tomismatched supply and input voltages.equivalent Bipolar Schottky TTL while maintaining theCMOS low power dissipation.74VHC138 3-to-8 Decoder/DemultiplexerNovember 1992Revised April 199974VHC1383-to-8 Decoder/Demultiplexer0V to 7V can be applied to the input pins without regard to |
