name:         x25040
function:     512*8 SPI Serial EEPROM with Block Lock Protection
package:      DIP,SOIC,8
manufacturer: Xicor

    +--()--+
*cs | 1   8| Vcc
 so | 2   7| *hold
*wp | 3   6| sck
Vss | 4   5| si
    +------+


This pinout came from the Chipdir:
http://www.chipdir.org/