19. Input Test Waveforms and Measurement Levels
AC
DRIVING
LEVELS
2.4V
0.45V
tR, tF < 2ns (10% to 90%)
20. Output Test Load
DEVICE
UNDER
TEST
1.5V
AC
MEASUREMENT
LEVEL
30pF
21. AC Waveforms
Six different timing waveforms are shown on page 35. Waveform 1 shows the SCK signal being
low when CS makes a high-to-low transition, and waveform 2 shows the SCK signal being high
when CS makes a high-to-low transition. In both cases, output SO becomes valid while the
SCK signal is still low (SCK low time is specified as tWL). Timing waveforms 1 and 2 conform to
RapidS serial interface but for frequencies up to 66MHz. Waveforms 1 and 2 are compatible with
SPI Mode 0 and SPI Mode 3, respectively.
Waveform 3 and waveform 4 illustrate general timing diagram for RapidS serial interface. These
are similar to waveform 1 and waveform 2, except that output SO is not restricted to become
valid during the tWL period. These timing waveforms are valid over the full frequency range (max-
imum frequency = 66MHz) of the RapidS serial case.
34 AT45DB011D
3639M–DFLASH–11/2017