at45db321b-c ATMEL Corporation, at45db321b-c Datasheet - Page 14

• Manufacturer Part Number: at45db321b-c
• Description: At45db321b 32-megabit 2.7-volt Only Dataflash
• Manufacturer: 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
AT45DB321B
SCK
SCK
SO
SO
CS
CS
SI
SI
HIGH IMPEDANCE
HIGH Z
t
CSS
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
DRIVING
, t
t
LEVELS
SU
t
V
CSS
t
F
SU
AC
< 3 ns (10% to 90%)
t
VALID IN
WL
VALID IN
0.45V
2.4V
VALID OUT
t
WH
t
WH
t
t
V
HO
DEVICE
UNDER
TEST
t
H
t
H
t
WL
VALID OUT
2.0
0.8
t
HO
30 pF
t
CSH
AC
MEASUREMENT
LEVEL
t
CSH
HIGH IMPEDANCE
HIGH IMPEDANCE
t
t
t
t
DIS
DIS
CS
CS
2223E–DFLASH–11//03