2-wire Serial EEProm for Dimm Serial Presence Detect S-34C02B

This IC is a 2-wire serial EEPROM for DIMM Serial Presence Detect which operates with low current consumption and the wide range operation. This IC has the capacity of 2 K-bit and the organization of 256 words × 8-bit. Page write and sequential read are available.
This IC has hardware write protect and software write protect. Hardware write protect inhibits write to all memory area when connecting the WP pin to Vcc. Software write protect inhibits write in 50% of the lower address (address 00h to 7Fh) in all memory area by inputting command when the WP pin is left open or connected to the GND pin.


Operation voltage range
Read: 1.7 V to 5.5 V
Write: 1.7 V to 5.5 V
Operation frequency
400 kHz max. (Vcc = 1.7 V to 5.5 V)
Write time
5.0 ms max.
Page write
16 bytes / page
Sequential read
Noise suppression
Schmitt trigger and noise filter on input pins (SCL, SDA)
Write protect function during low power supply voltage
106 cycle / word*1 (Ta = +25°C)
Data retention
100 years (Ta = +25°C)
Memory capacity
2 K-bit
Initial delivery state
Operation temperature range
Ta = -40°C to +85°C
Write protect
Hardware protect 100% (addresses 00h to FFh)
Software protect for the lower address of 50% (addresses 00h to 7Fh)
Lead-free (Sn 100%), halogen-free

*1. For each address (Word: 8-bit)