SPI-Bus Serial EEPROM S-25C640A

The S-25C640A is a SPI serial EEPROM which operates at high speed, with low current consumption and the wide range operation. The S-25C640A has the capacity of 64 K-bit, and the organization is 8192 words × 8-bit, respectively. Page write and sequential read are available.


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
CMOS schmitt input
( CS , SCK, SI, WP , HOLD )
106cycles / word*1 (Ta = +25°C)
Data retention
100 years (Ta = +25°C)
Memory capacity
64 K-bit
Initial shipment data
FFh, SRWD = 0, BP1 = 0, BP0 = 0
Lead-free (Sn 100%), halogen-free*2

*1. For each address (Word: 8-bit)
*2. Refer to “Product Name Structure” of the data sheet for details.