Tecnologia

DM54LS154 DM74LS154 4-Line to 16-Line Decoders Demultiplexers

May 1989

DM54LS154 DM74LS154 4-Line to 16-Line Decoders Demultiplexers
General Description
Each of these 4-line-to-16-line decoders utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs G1 and G2 are low The demultiplexing function is performed byusing the 4 input lines to address the output line passing data from one of the strobe inputs with the other strobe input low When either strobe input is high all outputs are high These demultiplexers are ideally suited for implementing high-performance memory decoders All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify systemdesign

Features
Y Y

Y Y Y

Y

Decodes 4 binary-coded inputs into one of 16 mutually exclusive outputs Performs the demultiplexing function by distributing data from one input line to any one of 16 outputs Input clamping diodes simplify system design High fan-out low-impedance totem-pole outputs Typical propagation delay 3 levels of logic 23 ns Strobe 19 ns Typical power dissipation 45 mWConnection and Logic Diagrams
Dual-In-Line Package

TL F 6394–1

Order Number DM54LS154J DM74LS154WM or DM74LS154N See NS Package Number J24A M24B or N24A

TL F 6394 – 2

C1995 National Semiconductor Corporation

TL F 6394

RRD-B30M105 Printed in U S A

Absolute Maximum Ratings

(Note) Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the devicecannot be guaranteed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation

If Military Aerospace specified devices are required please contact the National SemiconductorSales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55 C to a 125 C DM54LS DM74LS 0 C to a 70 C b 65 C to a 150 C Storage Temperature Range

Recommended Operating Conditions
Symbol VCC VIH VIL IOH IOL TA Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low LevelOutput Current Free Air Operating Temperature
b 55

DM54LS154 Nom 5 Max 55 07
b0 4

DM74LS154 Min 4 75 2 08
b0 4

Units Max 5 25 V V V mA mA C

Nom 5

45 2

4 125 0

8 70

Electrical Characteristics
Symbol VI VOH VOL Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage

over recommended operating free air temperature range (unless otherwise noted)Conditions VCC e Min II e b18 mA VCC e Min IOH e Max VIL e Max VIH e Min VCC e Min IOL e Max VIL e Max VIH e Min IOL e 4 mA VCC e Min DM54 DM74 DM54 DM74 DM74 25 27 34 34 0 25 0 35 0 25 04 05 04 01 20
b0 4

Min

Typ (Note 1)

Max
b1 5

Units V V

V

II IIH IIL IOS ICC

Input Current Input Voltage

Max

VCC e Max VI e 7V VCC e Max VI e 2 7V VCC e Max VI e 0 4V VCC e Max (Note2) VCC e Max (Note 3) DM54 DM74
b 20 b 20

mA mA mA mA mA

High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current

b 100 b 100

9

14

Note 1 All typicals are at VCC e 5V TA e 25 C Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second Note 3 ICC is measured with all outputs open and all inputsgrounded

Switching Characteristics
Symbol tPLH tPHL tPLH tPHL Parameter Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output

at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load) From (Input) To (Output) Data to Output Data to...