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DP8473 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DP8473 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 28 page  TLF9384 July 1990 DP8473 Floppy Disk Controller PLUS-2 TM General Description This controller is a full featured floppy disk controller that is software compatible with the mPD765A but also includes many additional hardware and software enhancements These enhancements include additional logic specifically re- quired for an IBM PC PC-XT PC-AT or PS2 design This controller incorporates a precision analog data separa- tor that includes a self trimming delay line and VCO Up to three external filters are switched automatically depending on the data rate selected This provides optimal perform- ance at the standard PC data rates of 250300 kbs and 500 kbs It also enables optimum performance at 1 Mbs (MFM) These features combine to provide the lowest possi- ble PLL bandwidth with the greatest lock range and hence the widest window margin This controller includes write precompensation circuitry A shift register is used to provide a fixed 125 ns early-late precompensation for all tracks at 500k300k250 kbs (83 ns for 1 MBs) or a precompensation value that scales with (Continued) Features Y Fully mPD765A and IBM-BIOS compatible Y Integrates all PCXT PCAT and most PS2 Logic On chip 24 MHz Crystal Oscillator DMA enable logic IBM compatible address decode of A0 – A2 12 mA mP bus interface buffers 48 mA floppy drive interface buffers Data rate and drive control registers Y Precision analog data separator Self-calibrating PLL and delay line Automatically chooses one of three filters Intelligent read algorithm Y Two pin programmable precompensation modes Y Other enhancements up to 1 Mbs data rate Implied seek up to 4000 tracks IBM or ISO formatting Y Low power CMOS with power down mode Connection Diagrams Plastic Leaded Chip Carrier TLF9384 – 1 Top View Order Number DP8473V See NS Package Number V52A Dual-In-Line Package TLF9384 – 2 Top View Order Number DP8473N See NS Package Number N48A TRI-STATE is a registered trademark of National Semiconductor Corporation PLUS-2TM is a trademark of National Semiconductor Corporation IBM PCXT PCAT and PS2 are registered trademarks of International Business Machines Corporation C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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