Pm25LD512-KCE datasheet(27/33 Pages) ETC2

Part #	Pm25LD512-KCE

Description	512Kbit/1 Mbit / 2 Mbit Single Operating Voltage Serial Flash Memory With 100 MHz Dual-Output SPI Bus

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27 / 33 page

Pm25LD512/010/ 020

Confidential information

Chingis Technology Corp.

27

DRAFT Date: August, 2010, Rev:0.4

POWER-UP AND POWER-DOWN

At Power-up and Power-down, the device must not be

selected (CE# must follow the voltage applied on Vcc)

until Vcc reaches the correct value:

- Vcc(min) at Power-up, and then for a further delay of

tVCE

- Vss at Power-down

Usually a simple pull-up resistor on CE# can be used

to insure safe and proper Power-up and Power-down.

To avoid data corruption and inadvertent write

operations during power up, a Power On Reset (POR)

circuit is included. The logic inside the device is held

reset while Vcc is less than the POR threshold value

(Vwi) during power up, the device does not respond to

any instruction until a time delay of tPUW has elapsed

after the moment that Vcc rised above the VWI

threshold. However, the correct operation of the device

is not guaranteed if, by this time, Vcc is still below

Vcc(min). No Write Status Register, Program or Erase

instructions should be sent until the later of:

- tPUW after Vcc passed the VWI threshold

- tVCE after Vcc passed the Vcc(min) level

At Power-up, the device is in the following state:

- The device is in the Standby mode

- The Write Enable Latch (WEL) bit is reset

At Power-down, when Vcc drops from the operating

voltage, to below the Vwi, all write operations are

disabled

and the device does not respond to any write

instruction.

Chip Selection Not Allowed

All Write Commands are Rejected

tVCE

Read Access Allowed

Device fully accessible

tPUW

Vcc

Vcc(max)

Vcc(min)

Reset State

V (write inhibit)

Time

Symbol

Parameter

Min.

Max.

Unit

tVCE

*1

Vcc(min) to CE# Low

10

us

tPUW

*1

Power-Up time delay to Write instruction

1

10

ms

VWI

*1

Write Inhibit Voltage

2.1

V

Note : *1. These parameters are characterized only.

1.8

1.6

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