M93C76-RBN3TP datasheet(6/31 Pages) STMICROELECTRONICS

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MEMORY ORGANIZATION

The M93Cx6 memory is organized either as bytes

(x8) or as words (x16). If Organization Select

(ORG) is left unconnected (or connected to VCC)

the x16 organization is selected; when Organiza-

tion Select (ORG) is connected to Ground (VSS)

the x8 organization is selected. When the M93Cx6

is in stand-by mode, Organization Select (ORG)

should be set either to VSS or VCC for minimum

power consumption. Any voltage between VSS

and VCC applied to Organization Select (ORG)

may increase the stand-by current.

INTERNAL DEVICE RESET

In order to prevent inadvertent Write operations

during Power-up, a Power On Reset (POR) circuit

is included.

At Power-up and Power-down, the device must

not be selected (that is, the Chip Select Input (S)

must be driven Low) until the supply voltage

reaches the operating voltage VCC (as defined in

Tables 9, 10 and 11).

During Power-up (phase during which VCC is low-

er than VCCmin but increases continuously), the

device will not respond to any instruction until VCC

has reached the Power On Reset threshold volt-

age (this threshold is lower than the minimum VCC

operating voltage defined in DC AND AC PARAM-

ETERS). Once VCC has passed the POR thresh-

old, the device is reset.

Prior to selecting the memory and issuing instruc-

tions to it, a valid and stable VCC voltage must be

applied. 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).

During Power-down (phase during which VCC de-

creases continuously), as soon as VCC drops from

the normal operating voltage below the Power On

Reset threshold voltage, the device stops re-

sponding to any instruction sent to it.

ACTIVE POWER AND STANDBY POWER MODES

When Chip Select (S) is High, the device is select-

ed and in the Active Power mode. It consumes

ICC, as specified in Tables 15, 16, 17, 18 and 19.

When Chip Select (S) is Low, the device is dese-

lected.

If no Erase/Write cycle is in progress when Chip

Select goes Low, the device enters the Standby

Power mode, and the power consumption drops to

ICC1.

For the M93Cx6 devices (5V range) the POR

threshold voltage is around 3V. For the M93Cx6-

W (3V range) and M93Cx6-R (2V range) the POR

threshold voltage is around 1.5V.

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