AT45DB321 datasheet(9/20 Pages) ATMEL

Part #	AT45DB321

Description	32-Megabit 2.7-volt Only Serial DataFlash

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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9 / 20 page

AT45DB321

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

Waveform 2 – Inactive Clock Polarity High

SCK

tCSS

VALID IN

tSU

tWH

tWL

tCSH

tCS

HIGH IMPEDANCE

VALID OUT

tHO

tDIS

HIGH IMPEDANCE

SCK

tCSS

VALID IN

tSU

tWL

tWH

tCSH

tCS

HIGH Z

VALID OUT

tHO

tDIS

HIGH IMPEDANCE

AT45DB321 Datasheet(PDF) 9 Page - ATMEL Corporation