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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ELANSC310 датащи(PDF) 87 Page - Advanced Micro Devices |
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ELANSC310 датащи(HTML) 87 Page - Advanced Micro Devices |
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87 / 119 page  Élan™SC310 Microcontroller Data Sheet 87 PREL IMINARY AC SWITCHING CHARACTERISTICS AND WAVEFORMS The AC specifications provided in the AC characteris- tics tables that follow consist of output delays, input setup requirements, and input hold requirements. Fig- ure 31 provides a key to the switching waveforms. AC specifications measurement is defined by the fig- ures that follow each timing table. Output delays are specified with minimum and maxi- mum limits, measured as shown. The minimum delay times are hold times provided to external circuitry. Input setup and hold times are specified as minimums, defining the smallest acceptable sampling window. Within the sampling window, a synchronous input sig- nal must be stable for correct microcontroller operation. Figure 31. Key to Switching Waveforms AC Switching Test Waveforms Notes: For AC testing, inputs are driven at 3 V for a logic 1 and 0 V for a logic 0. WAVEFORMS INPUTS OUTPUTS Must be Steady Will be Steady May Change from H to L Will be Changing from H to L May Change from L to H Will be Changing from L to H Don’t Care, Any Change Permitted Changing, State Unknown Does Not Apply Center Line is High-Impedance “Off” State VCC ÷ 2 VCC ÷ 2 VIH = VCC Input VIL = 0 Test Points Output |
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