GR >> AT27C512R-90TC 
89442
AT27C512R-90TC
Atmel
Quantity 20000
Packaging IC OTP 512KBIT 90NS 28TSOP
Description original&Quality new original
554308
AT27C512R-90TC
Microchip Technology
Quantity 9000
Packaging IC OTP 512KBIT 90NS 28TSOP
Description original&Quality new original