M34D64-W Ver la hoja de datos (PDF) - STMicroelectronics
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componentes Descripción
Fabricante
M34D64-W
STMicroelectronics
M34D64-W Datasheet PDF : 27 Pages
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M34D64-W
Signal description
2.5
VSS ground
VSS is the reference for the VCC supply voltage.
2.6
2.6.1
2.6.2
2.6.3
2.6.4
Supply voltage (VCC)
Operating supply voltage VCC
Prior to selecting the memory and issuing instructions to it, a valid and stable VCC voltage
within the specified [VCC(min), VCC(max)] range must be applied (see Table 7). In order to
secure a stable DC supply voltage, it is recommended to decouple the VCC line with a
suitable capacitor (usually of the order of 10 nF to 100 nF) close to the VCC/VSS package
pins.
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).
Power-up conditions
When the power supply is turned on, VCC rises from VSS to VCC, the VCC rise time must not
vary faster than 1 V/µs.
Device reset
In order to prevent inadvertent write operations during power-up, a power-on-reset (POR)
circuit is included. At power-up (continuous rise of VCC), the device does not respond to any
instruction until VCC has reached the power-on-reset threshold voltage (this threshold is
lower than the minimum VCC operating voltage defined in Table 7). When VCC passes over
the POR threshold, the device is reset and enters the Standby Power mode. It 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.
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).
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