The Microchip Technology Inc. 24C04A is a 4K bit Electrically Erasable PROM. The device is organized as with a standard two wire serial interface. Advanced CMOS technology allows a significant reduction in power over NMOS serial devices. A special feature provides hardware write protection for the upper half of the block. The 24C04A has a page write capability of up to eight bytes, and up to four 24C04A devices may be connected to the same two wire bus. This device offers fast (1ms) byte write and extended (-40°C to 125°C) temperature operation. It is recommended that all other applications use Microchip’s 24LC04B.