Product Summary

The dp8473n is a full featured floppy disk controller that is software compatible with the mPD765A, but also includes many additional hardware and software enhancements. This controller incorporates a precision analog data separator, 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 performance at the standard PC data rates of 250/300 kb/s, and 500 kb/s. It also enables optimum performance at 1 Mb/s (MFM). These features combine to provide the lowest possible PLL bandwidth, with the greatest lock range, and hence the widest window margin.

Parametrics

dp8473n absolute maximum ratings: (1)Supply Voltage (VCC): -0.5V to 7V; (2)DC Input Voltage (VIN): -0.5V to VCC + 0.5V; (3)DC Output Voltage (VOUT): -0.5V to VCC + 0.5V; (4)Storage Temperature Range (TSTG): -65 to 165℃; (5)Package Power Dissipation (PD): 750 mW; (6)Lead Temperature (TL)(Soldering, 10 seconds): 260℃; (7)lVCC±VCCAl: 0.6V.

Features

dp8473n features: (1)Fully mPD765A and IBM-BIOS compatible; (2)Integrates all PCXT, PCAT, and most PS/2 Logic; (3)On chip 24 MHz Crystal Oscillator; (4)DMA enable logic; (5)IBM compatible address decode of A0±A2; (6)12mA mP bus interface buffers; (7)48 mA floppy drive interface buffers; (8)Data rate and drive control registers; (9)Precision analog data separator; (10)Self-calibrating PLL and delay line; (11)Automatically chooses one of three filters; (12)Intelligent read algorithm; (13)Two pin programmable precompensation modes; (14)up to 1 Mb/s data rate; (15)Implied seek up to 4000 tracks; (16)IBM or ISO formatting; (17)Low power CMOS, with power down mode.

Diagrams

dp8473n block diagram