M34E04B datasheet(9/35 Pages) STMICROELECTRONICS

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M34E04B

Signal description

This voltage must remain stable and valid until the end of the transmission of the instruction

and, for a Write instruction, until the completion of the internal write cycle (tW).

2.4.2

Power-up conditions

The VCC voltage has to rise continuously from 0 V up to the minimum VCC operating voltage

defined in Table 8.

2.4.3

Device reset

In order to prevent inadvertent write operations during power-up, a power-on reset (POR)

circuit is included. At power-up, the device does not respond to any instruction until VCC

reaches the internal reset threshold voltage (this threshold is lower than the minimum VCC

operating voltage defined in Table 8).

When VCC passes over the POR threshold, the device is reset and enters the Standby

Power mode. However, the device must not be accessed until VCC reaches a valid and

stable VCC voltage within the specified [VCC(min), VCC(max)] range.

In a similar way, during power-down (continuous decrease in VCC), as soon as VCC drops

below the power-on reset threshold voltage, the device stops responding to any instruction

sent to it.

2.4.4

Power-down conditions

During power-down (continuous decrease in VCC), the device must be in Standby Power

mode (mode reached after decoding a Stop condition, assuming that there is no internal

write cycle in progress).

M34E04B Datasheet(PDF) 9 Page - STMicroelectronics