AT25PE20 datasheet(40/64 Pages) DIALOG

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AT25PE20

DS-25PE20–139C–8/2018

16.

Power-On/Reset State

When power is first applied to the device, or when recovering from a reset condition, the output pin (SO) will be in a high

impedance state, and a high-to-low transition on the CSB pin will be required to start a valid instruction. The SPI mode

(Mode 3 or Mode 0) will be automatically selected on every falling edge of CSB by sampling the inactive clock state.

16.1

Power-Up/Power-Down Voltage and Timing Requirements

As the device initializes, there will be a transient current demand. The system needs to be capable of providing this

current to ensure correct initialization. During power-up, the device must not be accessed for at least the minimum t

VCSL

time after the supply voltage reaches the minimum V

CC level. While the device is being powered-up, the internal Power-

On Reset (POR) circuitry keeps the device in a reset mode until the supply voltage rises above the maximum POR

threshold value (VPOR). During this time, all operations are disabled and the device will not respond to any commands.

After power-up, the device will be in the standby mode.

If the first operation to the device after power-up will be a program or erase operation, then the operation cannot be

started until the supply voltage reaches the minimum V

CC level and an internal device delay has elapsed. This delay will

be a maximum time of tPUW.

Table 16-1. Voltage and Timing Requirements for Power-Up/Power-Down

Figure 16-1. Power-Up Timing

Symbol

Parameter

Min

Max

Units

PWD

(1)

Not 100% tested (value guaranteed by design and characterization).

CC for device initialization

1.0

PWD

(1)

Minimum duration for device initialization

300

µs

VCSL

Minimum V

CC to chip select low time for Read command

µs

(1)

CC rise time

500000

µs/V

POR

Power on reset voltage

1.45

1.6

PUW

Power up delay time before Program or Erase is allowed

VCC

POR max

Max V

PWD

Time

PWD

PUW

Full Operation Permitted

VCSL

Read Operation

Permitted

CC min

VPOR max

PWD max

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