M95010 datasheet(9/42 Pages) STMICROELECTRONICS

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M95040, M95020, M95010

Signal description

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2.6

Write Protect (W)

This input signal is used to control whether the memory is write protected. When Write

Protect (W) is held low, writes to the memory are disabled, but other operations remain

enabled. Write Protect (W) must either be driven high or low, but must not be left floating.

2.7

VSS ground

VSS is the reference for the VCC supply voltage.

2.8

Supply voltage (VCC)

2.8.1

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 8, Table 9 and

Table 10). 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.

2.8.2

Power-up conditions

When the power supply is turned on, VCC rises continuously 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 S line to VCC via a suitable pull-up resistor (see

Figure 3).

In addition, the Chip Select (S) input offers a built-in safety feature, as it is edge-sensitive as

well as level-sensitive: after power-up, the device does not become selected until a falling

edge has first been detected on Chip Select (S). This ensures that Chip Select (S) must

have been high, prior to going low to start the first operation.

The VCC rise time must not vary faster than 1 V/µs.

2.8.3

Device reset

In order to prevent inadvertent Write operations during power-up (continuous rise of VCC), a

power on reset (POR) circuit is included. At power-up, 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 8, Table 9 and Table 10).

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