AT45DB021E datasheet(46/69 Pages) RENESAS

46 / 69 page

DS-AT45DB021E-8789 Rev. N

Page 46

3/24/26

AT45DB021E Datasheet

19. System Considerations

The serial interface is controlled by the Serial Clock (SCK), Serial Input (SI), and Chip Select (CS) pins. These

signals must rise and fall monotonically and be free from noise. Excessive noise or ringing on these pins can be

misinterpreted as multiple edges and causes improper operation of the device. PCB traces must be kept to a

minimum distance or appropriately terminated to ensure proper operation. If necessary, decoupling capacitors can

be added on these pins to provide filtering against noise glitches.

As system complexity continues to increase, voltage regulation is becoming more important. A key element of any

voltage regulation scheme is its current sourcing capability. Like all Flash memories, the peak current for

DataFlash devices occurs during the programming and erasing operations. The supply voltage regulator needs to

be able to supply this peak current requirement. An under specified regulator can cause current starvation.

Besides increasing system noise, current starvation during programming or erasing can lead to improper

operation and possible data corruption.

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