Description
The ACE25C400 is a 4M-bit (512K-byte) Serial Flash memory, with advanced write protection mechanisms. The ACE25C400 supports the standard Serial Peripheral Interface (SPI), and a high performance Dual output as well as Dual I/O.
The ACE25C400 can be programmed 1 to 512 bytes at a time, using the Page Program instruction. It is designed to allow either single Sector/Block at a time or full chip erase operation. The ACE25C400 can be configured to protect part of the memory as the software protected mode. The device can sustain a minimum of 100K program/erase cycles on each sector or block.

FEATUREs
● 4Mbit of Flash memory
   - 128 uniform sectors with 4K-byte each
   - 8 uniform block with 64K-byte each
   - 256 bytes per programmable page
● Wide Operation Range
   - 2.7V~3.6V single voltage supply
   - Industrial temperature range
● Serial Interface
   - Standard SPI: CLK, CS#, DI, DO, WP#
   - Dual SPI: CLK, CS#, DQ0, DQ1, WP#
   - Continuous READ mode support
● High Performance
   - Max FAST_READ clock frequency: 100MHz
   - Max READ clock frequency: 66MHz
   - Typical page program time: 1.5ms
   - Typical sector erase time: 90ms
   - Typical block erase time: 500ms
   - Typical chip erase time: 3.5s
● Low Power Consumption
   - Typical standby current: 1µA
● Security
   - Software and hardware write protection
   - Lockable 256-Byte OTP security sectors
   - Low Voltage Write Inhibit
● High Reliability
   - Endurance: 100,000program/erase cycles
   - Data retention: 20years