AN2014 datasheet(22/65 Pages) STMICROELECTRONICS

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Recommendations to improve EEPROM reliability

AN2014

22/65

DocID10701 Rev 10

3.3.2

Stabilized power supply voltage

The value of the stabilized power supply voltage, including potential variations, must always

stay within the operating VCC range specified in the datasheet, where device operation is

reliable and guaranteed. Application designers deal mostly with transient peak currents and

voltages. Transient peak current generated by EEPROM during read, write and output

buffer transitions induces transient voltage disturb on power supply lines. Therefore, the use

of high-frequency, low-inductance capacitors located as close as possible to the device VCC

and VSS pins are also recommended. Some applications with a limited power supply driving

capability may require a small value resistor (<50

Ω) connected to the EEPROM VCC pin, so

that the peaks of current sunk by the EEPROM during the write cycle (10 mA typical during

a few nanoseconds, with a duty cycle of less than 1/100) are mostly supplied by the

decoupling capacitor and so, induce less disturbance on the voltage supply line of the

application. See Figure 15.

Figure 15. Local EEPROM supply filtering

1. Capacitor should be placed as close as possible to VCCand VSS pins to avoid parasitic inductive effects.

2. Resistor must never be placed between the decoupling capacitor and the VCC pin of the EEPROM.

3.3.3

Absolute maximum ratings

Absolute maximum ratings are not operating values for the device. They provide an

additional security margin for temporary operating deviations. Temporary operation within

this margin will not cause the device to be damaged. However, the normal operation of the

EEPROM is neither guaranteed nor reliable under absolute maximum rating conditions that

are above or below normal operating conditions.

Voltage supply

EEPROM device

Ai11064b

VCC

VSS

10 nF < C < 100 nF

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