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Transcript
1250 F 14 1. Homework Circuit System Design Cards 2 According to datasheets, we have the following voltage levels for a LM324 output when used as a comparator and for a 74HC00 NAND gate input: LM324 Characteristic Symbol Min VOH 3.3 Typ 3.5 V Output Voltage-High Limit (VCC = 30 V) VOH 26 28 V Output Voltage-Low Limit (VCC = 5 V) VOL 5.0 20 mV Output Voltage-High Limit (VCC = 5 V) Max Unit 74HC00 Characteristic High-level input voltage (VCC = 4.5 V) Symbol Min VIH 3.15 Typ Max Unit V Absolute Min VIN VIN Low-level input voltage (VCC = 4.5 V) VIL 1.35 V Absolute Max VIN VIN 5 V –0.5 V LM324 datasheet: http://www.digikey.com/productsearch/en?vendor=0&keywords=lm324ngos 74HC00 datasheet: http://www.digikey.com/productsearch/en?x=0&y=0&lang=en&site=us&keywords=tc74hc00 Use the equations on the "Op-amp Level-Shifter" card (see below) to find resistor values to shift from vTh<Hi to vThHi and from vTh<Hi to vThHi. Assume RTh< = 0 Ω. Use resistors that are as large as possible without exceeding 1 MΩ. ANS: 1. TBA
