M25P05 datasheet(21/32 Pages) STMICROELECTRONICS

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M25P05

POWER-UP, POWER-DOWN AND DELIVERY STATE

Power-up

At Power-up, the device must not be selected (that

is Chip Select (S) must follow the voltage supplied

VCC) until the supply voltage reaches

VCC(min), and a further tVSL delay has elapsed.

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 – all operations are disabled,

and the device will not respond to any instruction.

Similarly, when VCC drops from the operating

voltage, to below the POR threshold value, VWI, all

operations are disabled and the device will not

respond to any instruction.

No instructions (including Read, Write Status

be sent to the device until a time delay of tVSL after

VCC has risen above the VCC(min) level.

Moreover, the device ignores all Page Program

(PP), Sector Erase (SE), Bulk Erase (BE) and

Write Status Register (WRSR) instructions until a

time delay of tPUW has elapsed after the moment

that VCC rises 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

–tVSL afterVCC passed the VCC(min) level

These values are specified in Table 7.

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

– The device is in the Standby mode (not the

Deep Power-down mode).

– The Write Enable Latch (WEL) bit is reset.

Figure 19. Power-up Timing

Table 7. Power-Up Timing and VWI Threshold

Note: 1. These parameters are characterized only.

Symbol

Parameter

Min.

Max.

Unit

tVSL1

VCC(min) to S low

µs

tPUW1

Time delay to Write instruction

VWI1

Write Inhibit Voltage

1.5

2.5

VCC

AI04009B

VCC(min)

VWI

Reset State

of the

Device

Chip Selection Not Allowed

Program, Erase and Write Commands are Rejected by the Device

tVSL

tPUW

time

Read Access allowed

Device fully

accessible

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