M95320-DRE View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M95320-DRE' PDF : 41 Pages View PDF
Application design recommendations
5
Application design recommendations
M95320-DRE
5.1
5.1.1
5.1.2
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 10 and Table 11).
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). 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.
Power-up conditions
When the power supply is turned on, VCC continuously rises from VSS to VCC. During this
time, the Chip Select (S) line is not allowed to float but should follow the VCC voltage. It is
therefore recommended to connect the S line to VCC via a suitable pull-up resistor (see
Figure 16).
The VCC voltage has to rise continuously from 0 V up to the minimum VCC operating voltage
defined in Table 12.
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
threshold voltage (this threshold is defined in the DC characteristics Table 12 as VRES).
When VCC passes over the POR threshold, the device is reset and in the following state:
• in the Standby power mode
• deselected
• Status register values:
– Write Enable Latch (WEL) bit is reset to 0.
– Write In Progress (WIP) bit is reset to 0.
– SRWD, BP1 and BP0 bits remain unchanged (non-volatile bits).
• not in the Hold condition
As soon as the VCC voltage has reached a stable value within [VCC(min), VCC(max)] range,
the device is ready for operation.
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