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SPC58ECX 数据表(PDF) 86 Page - STMicroelectronics |
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SPC58ECX 数据表(HTML) 86 Page - STMicroelectronics |
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86 / 153 page  Electrical characteristics SPC584Cx, SPC58ECx 86/153 DS11620 Rev 8 SIN setup time 7tSUI CC D SIN setup time to SCK(8) SCK drive strength Very strong 25 pF 25.0 — ns Strong 50 pF 31.0 — Medium 50 pF 52.0 — SIN hold time 8tHI CC D SIN hold time from SCK(8) SCK drive strength Very strong 0 pF –1.0 — ns Strong 0 pF –1.0 — Medium 0 pF –1.0 — SOUT data valid time (after SCK edge) 9tSUO CC D SOUT data valid time from SCK(9), (10) SOUT and SCK drive strength Very strong 25 pF — 7.0 ns Strong 50 pF — 8.0 Medium 50 pF — 16.0 SOUT data hold time (after SCK edge) 10 tHO CC D SOUT data hold time after SCK(9) SOUT and SCK drive strength Very strong 25 pF –7.7 — ns Strong 50 pF –11.0 — Medium 50 pF –15.0 — 1. All timing values for output signals in this table are measured to 50% of the output voltage. 2. Timing is guaranteed to same drive capabilities for all signals, mixing of pad drives may reduce operating speeds and may cause incorrect operation. 3. N is the number of clock cycles added to time between PCS assertion and SCK assertion and is software programmable using DSPI_CTARx[PSSCK] and DSPI_CTARx[CSSCK]. The minimum value is 2 cycles unless TSB mode or Continuous SCK clock mode is selected, in which case, N is automatically set to 0 clock cycles (PCS and SCK are driven by the same edge of DSPI_CLKn). 4. tSYS is the period of DSPI_CLKn clock, the input clock to the DSPI module. Maximum frequency is 100 MHz (min tSYS =10ns). 5. M is the number of clock cycles added to time between SCK negation and PCS negation and is software programmable using DSPI_CTARx[PASC] and DSPI_CTARx[ASC]. The minimum value is 2 cycles unless TSB mode or Continuous SCK clock mode is selected, in which case, M is automatically set to 0 clock cycles (PCS and SCK are driven by the same edge of DSPI_CLKn). 6. tSDC is only valid for even divide ratios. For odd divide ratios the fundamental duty cycle is not 50:50. For these odd divide ratios cases, the absolute spec number is applied as jitter/uncertainty to the nominal high time and low time. 7. PCSx and PCSS using same pad configuration. 8. Input timing assumes an input slew rate of 1 ns (10% – 90%) and uses TTL voltage thresholds. 9. SOUT Data Valid and Data hold are independent of load capacitance if SCK and SOUT load capacitances are the same value. Table 47. DSPI CMOS master classic timing (full duplex and output only) MTFE = 0, CPHA = 0 or 1 (continued) # Symbol C Characteristic Condition Value(1) Unit Pad drive(2) Load (CL)Min Max |
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