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AT45DB021A датащи(PDF) 12 Page - ATMEL Corporation

номер детали AT45DB021A
подробное описание детали  2-megabit 2.7-volt Only Serial DataFlash
PDF  28 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT45DB021A датащи(HTML) 12 Page - ATMEL Corporation

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AT45DB021A
12
Input Test Waveforms and
Measurement Levels
t
R, tF < 5 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 signal
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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