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54F138LM 数据表(PDF) 2 Page - National Semiconductor (TI) |
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54F138LM 数据表(HTML) 2 Page - National Semiconductor (TI) |
2 / 10 page Unit LoadingFan Out 54F74F Pin Names Description UL Input IIH IIL HIGHLOW Output IOH IOL A0–A2 Address Inputs 1010 20 mA b06 mA E1 E2 Enable Inputs (Active LOW) 1010 20 mA b06 mA E3 Enable Input (Active HIGH) 1010 20 mA b06 mA O0–O7 Outputs (Active LOW) 50333 b 1 mA20 mA Functional Description The ’F138 high-speed 1-of-8 decoderdemultiplexer ac- cepts three binary weighted inputs (A0 A1 A2) and when enabled provides eight mutually exclusive active LOW out- puts (O0–O7) The ’F138 features three Enable inputs 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 expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four ’F138 devices and one inverter (See Figure 1 ) The ’F138 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 appropriate 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 HH H HHHHH X H X X X X H H H HHHHH X X L X X X HH H HHHHH L L H L L L L H H HHHHH L L H H L L H L H HHHHH L L H L H L HH L HHHHH L L H H H L HH H L HHHH L L H L L H HH H H L HHH L L H H L H H H H H HLH H L L H L H H HH H HHH L H L L H H H H HH H HHHH L H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial 2 |
类似零件编号 - 54F138LM |
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类似说明 - 54F138LM |
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