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54AC139F 数据表(PDF) 2 Page - National Semiconductor (TI) |
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54AC139F 数据表(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 page Connection Diagrams Functional Description The ’AC/’ACT139 is a high-speed dual 1-of-4 decoder/ demultiplexer. The device has two independent decoders, each of which accepts two binary weighted inputs (A 0–A1) and provides four mutually exclusive active-LOW outputs (O 0–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 ’AC/’ACT139 generates all four minterms of two variables. These four minterms are useful in some applications, replacing multiple gate functions as shown in , and thereby reducing the number of packages re- quired in a logic network. Truth Table Inputs Outputs E A 0 A 1 O 0 O 1 O 2 O 3 H X X HHHH L LLL H H H L HLHLH H L L H H HLH L HHHHH L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Pin Assignment for DIP and Flatpak DS100269-3 Pin Assignment for LCC DS100269-4 DS100269-6 FIGURE 1. Gate Functions (Each Half) www.national.com 2 |
类似零件编号 - 54AC139F |
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类似说明 - 54AC139F |
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