M34E04B Datasheet, PDF (9/35 Pages) STMicroelectronics – 4-Kbit Serial Presence Detect EEPROM compatible

M34E04B
Signal description
2.4.2
2.4.3
2.4.4
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 (t_W).
Power-up conditions
The V_CC voltage has to rise continuously from 0 V up to the minimum V_CC operating voltage
defined in Table 8.
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 V_CC
reaches the internal reset threshold voltage (this threshold is lower than the minimum V_CC
operating voltage defined in Table 8).
When V_CC passes over the POR threshold, the device is reset and enters the Standby
Power mode. However, the device must not be accessed until V_CC reaches a valid and
stable V_CC voltage within the specified [V_CC(min), V_CC(max)] range.
In a similar way, during power-down (continuous decrease in V_CC), as soon as V_CC drops
below the power-on reset threshold voltage, the device stops responding to any instruction
sent to it.
Power-down conditions
During power-down (continuous decrease in V_CC), 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).
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