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SN74LS138N Datasheet(PDF) 2 Page - Motorola, Inc |
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SN74LS138N Datasheet(HTML) 2 Page - Motorola, Inc |
2 / 5 page 5-231 FAST AND LS TTL DATA SN54/74LS138 FUNCTIONAL DESCRIPTION The LS138 is a high speed 1-of-8 Decoder/Demultiplexer fabricated with the low power Schottky barrier diode process. The decoder accepts three binary weighted inputs (A0, A1, A2) and when enabled provides eight mutually exclusive active LOW Outputs (O0–O7). The LS138 features three Enable in- puts, two active LOW (E1, E2) and one active HIGH (E3). All outputs will be HIGH unless E1 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) decoder with just four LS138s and one inverter. (See Figure a.) The LS138 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 appropri- ate active HIGH or active LOW state. TRUTH TABLE INPUTS OUTPUTS E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7 H X X X X X H H H H H H H H X H X X X X H H H H H H H H X X L X X X H H H H H H H H L L H L L L L H H H H H H H L L H H L L H L H H H H H H L L H L H L H H L H H H H H L L H H H L H H H L H H H H L L H L L H H H H H L H H H L L H H L H H H H H H L H H L L H L H H H H H H H H L H L L H H H H H H H H H H H L H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care O0 O31 A0 A1 A2 A3 A4 H LS04 A0 A1 A2 E LS138 O0 O1 O2 O3 O4 O5 O6 O7 A0 A1 A2 E LS138 O0 O1 O2 O3 O5 O6 O7 O4 O0 O1 O2 O3 O5 O6 O7 O4 E LS138 A0 A1 A2 A0 A1 A2 E LS138 O0 O2 O3 O5 O6 O7 O4 O1 1 2 3 1 2 3 1 2 3 1 2 3 Figure a |
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