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AT45DB081B Datasheet(PDF) 14 Page - ATMEL Corporation

Part # AT45DB081B
Description  8-megabit 2.5-volt Only or 2.7-volt Only DataFlash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT45DB081B Datasheet(HTML) 14 Page - ATMEL Corporation

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AT45DB081B
2225C–12/01
Input Test Waveforms and Measurement Levels
t
R, tF < 3 ns (10% to 90%)
Output Test Load
AC Waveforms
Two different timing diagrams 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 sig-
nal being high when CS makes a high-to-low transition. Both waveforms show valid
timing diagrams. The setup and hold times for the SI signal are referenced to the low-to-
high transition on the SCK signal.
Waveform 1 shows timing that is also compatible with SPI Mode 0, and Waveform 2
shows timing that is compatible with SPI Mode 3.
Waveform 1 – Inactive Clock Polarity Low and SPI Mode 0
Waveform 2 – Inactive Clock Polarity High and SPI Mode 3
AC
DRIVING
LEVELS
AC
MEASUREMENT
LEVEL
0.45V
2.0
0.8
2.4V
DEVICE
UNDER
TEST
30 pF
CS
SCK
SI
SO
tCSS
VALID IN
tH
tSU
tWH
tWL
tCSH
tCS
tV
HIGH IMPEDANCE
VALID OUT
tHO
tDIS
HIGH IMPEDANCE
CS
SCK
SI
SO
tCSS
VALID IN
tH
tSU
tWL
tWH
tCSH
tCS
tV
HIGH Z
VALID OUT
tHO
tDIS
HIGH IMPEDANCE


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