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74LVQ138SC Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74LVQ138SC Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 8 page Functional Description The LVQ138 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 LVQ138 features three Enable inputs, two active-LOW (E 1,E2) and one active-HIGH (E3). All outputs will be HIGH unless E 1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four LVQ138 devices and one inverter (see Figure 1). The LVQ138 can be used as an 8-output demultiplexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes. The Enable inputs which are not used must be permanently tied to their appro- priate active-HIGH or active-LOW state. Truth Table 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 DS011350-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 |
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