M24C32S-FCU Datasheet, PDF (7/35 Pages) STMicroelectronics – 32-Kbit serial IC bus EEPROM 4 balls CSP

M24C32S-FCU
2
Signal description
Signal description
2.1
2.2
2.3
2.4
2.4.1
2.4.2
2.4.3
Serial Clock (SCL)
SCL is an input. The signal applied on the SCL input is used to strobe the data available on
SDA(in) and to output the data on SDA(out).
Serial Data (SDA)
SDA is an input/output used to transfer data in or data out of the device. SDA(out) is an
open drain output that may be wire-OR’ed with other open drain or open collector signals on
the bus. A pull-up resistor must be connected from Serial Data (SDA) to V_CC (Figure 9
indicates how to calculate the value of the pull-up resistor).
V_SS (ground)
V_SS is the reference for the V_CC supply voltage.
Supply voltage (V_CC)
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 Operating conditions
in Section 8: DC and AC parameters). In order to secure a stable DC supply voltage, it is
recommended to decouple the V_CC line with a suitable capacitor (usually from10 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).
Power-up conditions
The V_CC voltage has to rise continuously from 0 V up to the minimum V_CC operating voltage
(see Operating conditions in Section 8: DC and AC parameters) and the rise time must not
vary faster than 1 V/µs.
Device reset
In order to prevent inadvertent write operations during power-up, a power-on-reset (POR)
circuit is included.
At power-up, the device does not respond to any instruction until V_CC has reached the
internal reset threshold voltage. This threshold is lower than the minimum V_CC operating
voltage (see Operating conditions in Section 8: DC and AC parameters). When V_CC passes
over the POR threshold, the device is reset and enters the Standby Power mode; however,
the device must not be accessed until V_CC reaches a valid and stable DC voltage within the
specified [V_CC(min), V_CC(max)] range (see Operating conditions in Section 8: DC and AC
parameters).
DocID026427 Rev 5
7/35
34