The S-25C320A/640A is a SPI serial E2PROM which operates at high speed, with low current consumption and the wide range operation. The S-25C320A/640A has the capacity of 32 K-bit and 64 K-bit, and the organization is 4096 words × 8-bit, 8192 words × 8-bit. Page write and sequential read are available.

Features
• Operating voltage range:
   Read 1.6 V to 5.5 V
   Write 1.7 V to 5.5 V
• Operation frequency 5.0 MHz (VCC = 2.5 V to 5.5 V)
• Write time: 5.0 ms max.
• SPI mode (0, 0) and (1, 1)
• Page write: 32 bytes / page
• Sequential read
• Write protect: Software, Hardware Protect area: 25%, 50%, 100%
• Monitors Write to the memory by a status register
• Function to prevent malfunction by monitoring clock pulse
• Write protect function during the low power supply voltage
• CMOS schmitt input ( CS , SCK, SI, WP , HOLD )
• Endurance: 106cycles / word*1 (Ta = +25°C)
• Data retention: 100 years (Ta = +25°C)
• Memory capacity:
   S-25C320A 32 K-bit
   S-25C640A 64 K-bit
• Initial delivery state: FFh, SRWD = 0, BP1 = 0, BP0 = 0
• Operation temperature range: Ta = −40°C to +85°C
• Lead-free (Sn 100%), halogen-free*2