FDC37C665GT/FDC37C666GT is a 2.88MB Super I/O Floppy Disk Controller from SMSC. It is based on the CMOS 765B Floppy Disk Controller core, has software and register compatibility, supports vertical recording format, and is 100% IBM compatible.
The SMSC FDC37C665GT and FDC37C666GT are high‑performance Multi‑Mode Super I/O floppy disk controller ICs. They integrate a CMOS 765B floppy controller, a 16‑byte FIFO, two NS16C550‑compatible UARTs, a Multi‑Mode parallel port with ChiProtect circuitry, and an IDE interface. The FDC37C665GT is optimized for motherboard use, while the FDC37C666GT targets controller‑card applications.
The devices support up to four direct‑drive floppy drives, multiple data rates (1 Mb/s, 500 Kb/s, 300 Kb/s, 250 Kb/s), and are fully compatible with IBM PC/XT, PC/AT, and PS/2 architectures. Detailed pin configurations, functional descriptions, and timing diagrams are provided for designers.
| Operating Voltage | 5 V |
|---|---|
| Maximum Data Rate | 1 Mb/s |
| Supported Data Rates | 1 Mb/s, 500 Kb/s, 300 Kb/s, 250 Kb/s |
| Number of UARTs | 2 |
| UART FIFO Depth | 16 bytes |
| Parallel Port Drivers | 24 mA Output Drivers, 48 mA Drivers |
| Floppy Drive Support | Up to 4 drives |
| Package Type | 100‑pin QFP |
| Compatibility | IBM PC/XT, PC/AT, PS/2, EPP, ECP |
It operates at 5 V.
The device includes two NS16C550‑compatible UARTs.
Yes, it supports four floppy drives directly.
Supported data rates are 1 Mb/s, 500 Kb/s, 300 Kb/s, and 250 Kb/s.