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54FCT138D bảng dữ liệu(PDF) 2 Page - National Semiconductor (TI) |
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54FCT138D bảng dữ liệu(HTML) 2 Page - National Semiconductor (TI) |
2 / 7 page Functional Description The FCT138 high-speed 1-of-8 decoder/demultiplexer ac- cepts three binary weighted inputs (A 0,A1,A2) and, when enabled, provides eight mutually exclusive active-LOW out- puts (O 0–O7). The FCT138 features three Enable inputs, two active-LOW (E 1,E2) and one active-HIGH (E3). All out- puts will be HIGH unless E 1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel ex- pansion of the device to a 1-of-32 (5 lines to 32 lines) de- coder with just four FCT138 devices and one inverter (see Figure 1). The FCT138 can be used as an 8-output demulti- plexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes. The En- able inputs which are not used must be permanently tied to their appropriate active-HIGH or active-LOW state. Inputs Outputs E 1 E 2 E 3 A 0 A 1 A 2 O 0 O 1 O 2 O 3 O 4 O 5 O 6 O 7 H XXXXX HHHHHHHH X H XXXX HHHHHHHH X X L X X X HHHHHHHH LL H LLLL HHHHHHH L L HH L L H L HHHHHH L L H L H L HH L HHHHH L L HHH L HHH L HHHH L L H L L HHHHH L HHH L L HH L HHHHHH L H H L L H L HHHHHHHH L H L L HHHHHHHHHHH L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Logic Diagram DS100963-4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com 2 |
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