S-34C04A Datasheet, PDF (18/22 Pages) Seiko Instruments Inc – FOR DIMM SERIAL PRESENCE DETECT

2-WIRE SERIAL E²PROM FOR DIMM SERIAL PRESENCE DETECT
S-34C04A
Rev.1.0_01_U
 Reset and Initialization
This IC has a power-on reset circuit which prevents malfunction, cancels write at power-on.
At power-on status, the master device should not transfer the data from the time that the power supply voltage reaches
VDD min. to tINIT. And at power-down, all registers are reset when the power supply voltage drops below VPOFF. Therefore
if the power supply voltage remains below VPOFF for tPOFF, all operations of this IC are reset.
Operating this IC will be required to apply the stable power supply voltage (VDD). The power supply voltage must remain
stable until the end of the transmission of the data and, for a write instruction.
t_INIT
t_POFF
t_INIT
VDD min.
V_PON
V_POFF
V_DD
Reset status
Normal operation
Reset status
Normal
operation
Figure 15 Operation when Power Supply Voltage Drops and Power-on
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