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SN74LS139N датащи(PDF) 2 Page - Motorola, Inc |
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SN74LS139N датащи(HTML) 2 Page - Motorola, Inc |
2 / 5 page 5-236 FAST AND LS TTL DATA SN54/74LS139 FUNCTIONAL DESCRIPTION The LS139 is a high speed dual 1-of-4 decoder/demultiplex- er fabricated with the Schottky barrier diode process. The device has two independent decoders, each of which accept two binary weighted inputs (A0, A1) and provide 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 LS139 generates all four minterms of two variables. These four minterms are useful in some applica- tions, replacing multiple gate functions as shown in Fig. a, and thereby reducing the number of packages required in a logic network. TRUTH TABLE INPUTS OUTPUTS E A0 A1 O0 O1 O2 O3 H X X H H H H L L L L H H H L H L H L H H L L H H H L H L H H H H H L H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 – 55 0 25 25 125 70 °C IOH Output Current — High 54, 74 – 0.4 mA IOL Output Current — Low 54 74 4.0 8.0 mA Figure a E A0 A1 E A0 A1 E A0 A1 E A0 A1 O0 O1 O2 O3 E A0 A1 E A0 A1 E A0 A1 E A0 A1 O0 O1 O2 O3 |
Аналогичный номер детали - SN74LS139N |
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Аналогичное описание - SN74LS139N |
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