M95128-RMB6GSLASHPC datasheet(11/44 Pages) STMICROELECTRONICS

11 / 44 page

M95128, M95128-W, M95128-R

Signal description

Doc ID 5798 Rev 13

11/44

3.8.3

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 12).

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

defined in Table 7, Table 8 and Table 9 and the rise time must not vary faster than 1 V/µs.

3.8.4

Power-down

During power-down (continuous decrease in the VCC supply voltage below the minimum

VCC operating voltage defined in Table 7, Table 8 and Table 9), the device must be:

●

deselected (Chip Select S should be allowed to follow the voltage applied on VCC)

●

in Standby Power mode (there should not be any internal write cycle in progress).

M95128-RMB6G/PC Datasheet(PDF) 11 Page - STMicroelectronics