AT >> AT27C512R-90RA 
90919
AT27C512R-90RA
Atmel
Quantity 20000
Packaging IC OTP 512KBIT 90NS 32PLCC
Description original&Quality new original
554305
AT27C512R-90RA
Microchip Technology
Quantity 9000
Packaging IC OTP 512KBIT 90NS 32PLCC
Description original&Quality new original