Western Digital WD1691
The WD1691 is implemented in N-MOS silicon gate technology and is available in a plastic or ceramic 20 pin dual-in-line package. These signals tie directly to the WD2143 Clock Generator. Single +5V Supply GENERAL DESCRIPTION The WD1691 F.S.L.| Part No. | WD1691 |
|---|---|
| Datasheet | WD1691 Download |
| Manufacturer |  Western Digital |
| Description | FLOPPY SUPPORT LOGIC |
| Buy | Stock & Price |
FEATURES
.. Direct interface to the FD179X● Eliminates external FDC Logic .. Data Separation/RCLK GENERATION .. Write Precompensation Signals
● VFOE/WF Demultiplexing
● Programmable Density o 8" or 5.25" Drive Compatible .. All inputs and outputs TTL Compatible ... has been designed to minimize the external logic required to interface the 179X Family of Floppy Disk Controllers to a drive. With the use of an external VCO, the WD 1691 will generate the RCLK signal for the WD179X, while providing an adjustment pulse (PUMP) to control the VCO frequency. VFOE/WF de-multiplexing is also accomplished and Write Precompensation signals have been included to interface directly with the WD2143 Clock Generator. oecno .IcII ~ o YCO WDIN l2 ~ l1 STB WDOUT WG VFOElWF VSS
● 1 20 19 18 17 16 WD1691 15 14 8 13 12 10 11 fI LATE EARLY VCO DDEN PD PU RCLK RDD DDEN VFOE !WF WG EARLY LATE BLOCK DIAGRAM RCLK PU po ROD TG43 fi 12 fi ~ WDIN WDOUT STB 399 PIN NAME SYMBOL FUNCTION WRITE DATA INPUT 2,3,4,19 PHASE 2,3,1,4 5 STROBE 6 WRITE DATA OUTPUT 7 WRITE GATE S VFO ENABLE!
