This datasheet provides detailed information on the X25040 product, including 1MHz clock rate, SPI modes, 512 x 8 bits, 4 byte page mode, low power CMOS, 150µA standby current, 3mA active current, 2.7V to 5.5V power supply, block lock protection, built-in inadvertent write protection, power-up/down protection circuitry, write latch, write protect pin, self-timed write cycle, 5ms write cycle time (typical), high reliability, endurance: 100,000 cycles/byte, data retention: 100 years, ESD protection: 2000V on all pins, 8-lead PDlP package, 8-lead SOIC package.