GR >> AT27C512R-90PC 
89438
AT27C512R-90PC
Atmel
Quantity 20000
Packaging IC OTP 512KBIT 90NS 28DIP
Description original&Quality new original
554303
AT27C512R-90PC
Microchip Technology
Quantity 9000
Packaging IC OTP 512KBIT 90NS 28DIP
Description original&Quality new original