BH6626FS

Magnetic disk ICs Read / Write amplifier for FDD BH6626FS The BH6626FS is a read / write IC designed for floppy disk drives and has an internal active filter for memory systems in which saddle margins are important. Any of multiple write current settings can be selected, and both density switching and inner track / outer track switching are done internally. FApplications Floppy disc drives (1MB and 2MB) FFeatures 1) Active filter switched internally. 2) Time domain filter with internal switch set according to transfer rate. 3) Density switching and inner track / outer track switching are done internally. FAbsolute maximum ratings (unless otherwise noted, Ta = 25_C) FRecommended operating conditions 522 Magnetic disk ICs FBlock diagram BH6626FS 523 Magnetic disk ICs FPin descriptions and Input / output circuits BH6626FS 524 Magnetic disk ICs BH6626FS 525 Magnetic disk ICs BH6626FS 526 Magnetic disk ICs BH6626FS FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V) Supply current 527 Magnetic disk ICs Low level voltage detection circuit BH6626FS Recovery time Preamplifier 528 Magnetic disk ICs Preamplifier / L.P.F / differentiator (B.P.F) BH6626FS Comparator and waveform shaping Write circuit 529 Magnetic disk ICs Erase output BH6626FS Logic input FMode table Total filter peak frequency setting f0 = a / (RRCC [kΩ] +0.09) [kHz] a= 412 1M outer track 439 1M inner track 790 2M outer track 867 2M inner track 732 outer track(...