AT45DB081B-CNC-2.5 ATMEL [ATMEL Corporation], AT45DB081B-CNC-2.5 Datasheet - Page 14

• Manufacturer Part Number: AT45DB081B-CNC-2.5
• Description: 8-megabit 2.5-volt Only or 2.7-volt Only DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

Input Test Waveforms and Measurement Levels
Output Test Load
AC Waveforms
Waveform 1 – Inactive Clock Polarity Low and SPI Mode 0
Waveform 2 – Inactive Clock Polarity High and SPI Mode 3
14
AT45DB081B
SCK
SCK
SO
SO
CS
CS
SI
SI
HIGH IMPEDANCE
HIGH Z
tCSS
t
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.
R
, t
tSU
tV
tCSS
tSU
DRIVING
F
LEVELS
< 3 ns (10% to 90%)
AC
tWL
VALID IN
VALID IN
0.45V
2.4V
VALID OUT
tWH
tWH
tHO
tV
DEVICE
UNDER
TEST
tH
tH
tWL
VALID OUT
2.0
0.8
tHO
30 pF
tCSH
AC
MEASUREMENT
LEVEL
tCSH
tCS
tCS
HIGH IMPEDANCE
HIGH IMPEDANCE
tDIS
tDIS
2225C–12/01