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900844 Datasheet(PDF) 24 Page - Freescale Semiconductor, Inc |
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900844 Datasheet(HTML) 24 Page - Freescale Semiconductor, Inc |
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24 / 118 page  Analog Integrated Circuit Device Data 24 Freescale Semiconductor 900844 ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS Table 4. Dynamic Electrical Characteristics TA = -40 to 85 °C, VPWR = 3.0 to 4.4 V, in gathering these parametrics, Freescale used the external components described in the Hardware Design Considerations section of this document, over the full load current range, unless otherwise noted. Typical values are characterized at VPWR = 3.6 V and 25 °C. Characteristic Symbol Min Typ Max Unit SPI INTERFACE TIMING AND LOGIC IO Time SPICSB has to be low before the first rising edge of SPICLK tSELSU 20 - - ns Time SPICSB has to remain low after the last falling edge of SPICLK tSELHLD 20 - - ns Time SPICSB has to remain high between two transfers tSELHIGH 20 - - ns Clock period of SPICLK (Equivalent to a maximum clock frequency of 25 MHz) tCLKPER 40 - - ns Part of the clock period where SPICLK has to remain high tCLKHIGH 18 - - ns Part of the clock period where SPICLK has to remain low tCLKLOW 18 - - ns Time MOSI has to be stable before the next falling edge of SPICLK tWRTSU 5.0 - - ns Time MOSI has to remain stable after the falling edge of SPICLK tWRTHLD 5.0 - - ns Time MISO will be stable before the next falling edge of SPICLK tRDSU 5.0 - - ns Time MISO will remain stable after the falling edge of SPICLK tRDHLD 5.0 - - ns Time MISO needs to become active after the falling edge of SPICSB tRDEN Refer to Figure 6 for more details Time MISO needs to become inactive after the rising edge of SPICSB tRDDIS 5.0 - - ns VIDEN/VID TIMING SPECIFICATION VIDEN/VID Debounce time tDB 100 - 400 ns VIDEN Invalid State Hold Time tHOLD 1.0 - - μs OSCILLATOR AND CLOCK OUTPUTS MAIN CHARACTERISTICS RTC OSC Startup Time (Upon Application of Power) - - - 500 ms RTC RTC Clock Frequency, Crystal OSC Nominal Frequency - - 32.768 - KHz VCC ELECTRICAL CHARACTERISTICS Transient Load Speed of Change ICC/t - - 1.0 A/ns Soft Start Time (Enable to output voltage ramp up from 0 to 1.0 V (25 mV/s)) tSSCC - - 0.06 ms Turn Off Time (OFF to output voltage ramp down to 0 V) tCCOFF - - 1.0 ms DAC Slew Rate - - 25 - mV/µs Switching Frequency fSW - 1.0 - MHz VNN ELECTRICAL CHARACTERISTICS Transient Load Speed of Change INN/t - - 1.0 A/ns Soft Start Time (Enable to output voltage ramp up from 0 V to 1.0 V (25 mV/s)) tSSNN - - 0.06 ms Turn Off Time (OFF to output voltage ramp down to 0 V) tNNOFF - - 1.0 ms DAC Slew Rate - - 25 - mV/µs Switching Frequency fSW - 1.0 - MHz |
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