JS28F256P30T85 datasheet(47/102 Pages) INTEL

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1-Gbit P30 Family

Datasheet

Intel StrataFlash® Embedded Memory (P30)

April 2005

Order Number: 306666, Revision: 001

8.3

Power Supply Decoupling

Flash memory devices require careful power supply de-coupling. Three basic power supply current

considerations are: 1) standby current levels; 2) active current levels; and 3) transient peaks

produced when CE# and OE# are asserted and deasserted.

When the device is accessed, many internal conditions change. Circuits within the device enable

charge-pumps, and internal logic states change at high speed. All of these internal activities

produce transient signals. Transient current magnitudes depend on the device outputs’ capacitive

and inductive loading. Two-line control and correct de-coupling capacitor selection suppress

transient voltage peaks.

Because Intel

® Multi-Level Cell (MLC) flash memory devices draw their power from VCC, VPP,

and VCCQ, each power connection should have a 0.1 µF ceramic capacitor to ground. High-

frequency, inherently low-inductance capacitors should be placed as close as possible to package

leads.

Additionally, for every eight devices used in the system, a 4.7 µF electrolytic capacitor should be

placed between power and ground close to the devices. The bulk capacitor is meant to overcome

voltage droop caused by PCB trace inductance.

Figure 27.

Reset Operation Waveforms

(A) Reset during

read mode

(B) Reset during

program or block erase

≤ P2

program or block erase

≥ P2

RST# [P]

Abort

Complete

Abort

Complete

(D) VCC Power-up to

RST# high

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