S-34C02A Datasheet, PDF (25/34 Pages) Seiko Instruments Inc – 2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT

2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT
Rev.1.2_00
S-34C02A
5.0
4.0
Power Supply Voltage (V_CC)
[V]
3.0
2.0
50 100 150 200
Rise Time (t_RISE) Max.
[ms]
For example: If the supply voltage = 5.0 V, raise the power supply voltage to 5.0 V within 200 ms.
Figure 25 Rise Time of Power Supply Voltage
When initialization is successfully completed by the power-on-clear circuit, the S-34C02A enters the standby status.
If the power-on-clear circuit does not operate, the followings are the possible causes.
(1) Because the S-34C02A has not completed initialization, an instruction previously input is still valid or an instruction
may be inappropriately recognized. In this case, S-34C02A may perform the Write operation.
(2) The voltage drops due to power off while the S-34C02A is being accessed. Even if the master device is reset due
to the low power voltage, the S-34C02A may malfunction unless the power-on-clear operation conditions of S-
34C02A are satisfied. For the power-on-clear operation conditions of the S-34C02A, refer to 5.1 Raising power
supply voltage.
If the power-on-clear circuit does not operate, match the phase (reset) so that the S-34C02A’s internal circuit is normally
reset. The statuses of the S-34C02A immediately after the power-on-clear circuit operation and when phase is matched
(reset) are the same.
Seiko Instruments Inc.
25