AT45DB321C_06 datasheet(23/40 Pages) ATMEL

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3387L–DFLASH–6/06

AT45DB321C

11. Input Test Waveforms and Measurement Levels

tR, tF < 2 ns (10% to 90%)

12. Output Test Load

13. AC Waveforms

Four different timing waveforms are shown below. 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 t

WL). Timing waveforms 1 and 2 conform to Rap-

idS serial interface but for frequencies up to 33 MHz and are compatible with SPI Mode 0 and

SPI Mode 3 respectively. Waveforms 1 and 2 are also compatible with inactive clock polarity low

and inactive clock polarity high, since the maximum specified frequency in that case is 33 MHz.

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 t

WL period. These timing waveforms are valid over the full frequency range (max-

imum frequency = 40 MHz) of the RapidS serial case.

13.1

Waveform 1 – SPI Mode 0 Compatible (for Frequencies up to 33 MHz)

DRIVING

LEVELS

MEASUREMENT

LEVEL

1.5V

3.0V

DEVICE

UNDER

TEST

30 pF

SCK

tCSS

VALID IN

tSU

tWH

tWL

tCSH

tCS

HIGH IMPEDANCE

VALID OUT

tHO

tDIS

HIGH IMPEDANCE

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