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M24Cxx-W, M24Cxx-R, M24Cxx-F
Signal description
9/34
2.3
Supply voltage (V
CC
)
2.3.1
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 (see
Table 8
and
Table 9
).
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 10nF to 100nF) 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
and, for a Write instruction, until the completion of the internal write cycle (t
W
).
2.3.2
Internal 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
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 8
and
Table 9
).
When V
CC
has passed the POR threshold, the device is reset and is in Standby Power
mode.
2.3.3 Power-down
At Power-down (continuous decrease of 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.
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).
there should be no internal Write cycle in progress).
Figure 4.
Maximum R
P
value versus bus parasitic capacitance (C) for an I
2
C bus
AI01665b
VCC
C
SDA
R
P
MASTER
R
P
SCL
C
100
0
4
8
12
16
20
C (pF)
Maximum RP value (k
Ω
)
10
1000
fc = 400kHz
fc = 100kHz
Harman Kardon
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