Operating features M93C46, M93C56, M93C66, M93C76, M93C86
8/34 Doc ID 4997 Rev 12
3 Operating features
3.1 Supply voltage (V
CC
)
3.1.1 Operating supply voltage (V
CC
)
Prior to selecting the memory and issuing instructions to it, a valid and stable V
CC
voltage
within the specified [V
CC
(min), V
CC
(max)] range must be applied. In order to secure a stable
DC supply voltage, it is recommended to decouple the V
CC
line with a suitable capacitor
(usually of the order of 10 nF to 100 nF) close to the V
CC
/V
SS
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 (t
W
).
3.1.2 Power-up conditions
When the power supply is turned on, V
CC
rises from V
SS
to V
CC
. During this time, the Chip
Select (S) line is not allowed to float and should be driven to V
SS
, it is therefore
recommended to connect the S line to V
SS
via a suitable pull-down resistor.
The V
CC
rise time must not vary faster than 1 V/µs.
3.1.3 Power-up and 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 V
CC
), the device does not respond to any
instruction until V
CC
has reached the power on reset threshold voltage (this threshold is
lower than the minimum V
CC
operating voltage defined in Table 9: Operating conditions
(M93Cx6), Table 10: Operating conditions (M93Cx6-W) and Table 11: Operating conditions
(M93Cx6-R)).
When V
CC
passes the POR threshold, the device is reset and is in the following state:
● Standby Power mode
● deselected (assuming that there is a pull-down resistor on the S line)
3.1.4 Power-down
At power-down (continuous decrease in V
CC
), as soon as V
CC
drops from the normal
operating voltage to below the power on reset threshold voltage, the device stops
responding to any instruction sent to it.
During power-down, the device must be deselected and in the Standby Power mode (that is,
there should be no internal Write cycle in progress).
