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74F540PC 数据表(PDF) 2 Page - National Semiconductor (TI) |
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74F540PC 数据表(HTML) 2 Page - National Semiconductor (TI) |
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2 / 8 page ![]() Connection Diagrams (Continued) ’F541 TLF9553 – 4 TLF9553 – 5 Unit LoadingFan Out 54F74F Pin Names Description UL Input IIH IIL HIGHLOW Output IOH IOL OE1 OE2 TRI-STATE Output Enable Input (Active LOW) 1010 20 mA b06 mA In Inputs 1010 20 mA b06 mA On On Outputs 6001066 (80) b 12 mA64 mA (48 mA) Truth Table Inputs Outputs OE1 OE2 I ’F540 ’F541 LL H L H HX X Z Z XH X Z Z LL L H L H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Z e High Impedance Logic Diagrams IEEEIEC ’F540 TLF9553 – 3 IEEEIEC ’F541 TLF9553 – 6 2 |
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