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UM8329B fiches techniques PDF

UMC - Floppy Disk Interface Circuit

Numéro de référence UM8329B
Description Floppy Disk Interface Circuit
Fabricant UMC 
Logo UMC 





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UM8329B fiche technique
SUMO
UM832918329T18329BI8329BT
Features
• Digital date separator
Performs complete data separation function for
floppy disk drives
Separates FM and MFM encoded data
No critical adjustments necessary
5%" and 8" compatible
• Variable write precompensation
• Internal crystal osci lIator circu it
• Track-selectable write precompensation
• Retriggerable head-load timer
• Compatible with the FDC 179X, 8272A, and other
standard floppy disk controllers
• SAN-III MOS N-CHANNEL TECHNOLOGY
• Single + 5 volt supply
• TTL compatible
General Description
The UM8329/B is an MOS integrated circuit designed to
complement either the 179X or 8272A (765A) type of
floppy disk controller chip. It incorporates a digital data
separator, write precompensation logic, and a head-load
timer in one O.3-inch wide 20-pin package. A single pin will
/ configure the chip to work with either the 179X or 8272A
type of controller. The UM8329/B provides a number of
different dynamically selected precompensation values so
that different values may be used when writing to the
inner and outer tracks of the floppy disk drive. The
UM8329/B operates from a +5V supply and simply requires
that a 16 or 8 MHz crystal or TT L-Ievel clock be connected
to the XTAL/CLKIN pin. All inputs and outputs are TTL
compatible.
The UM8329 is available in four versions: The UM8329/T
are intended for 5%" disks and the UM8329B/T for 5%"
and 8" disks. The UM8329/B have an internal crystal
oscillator circuit; the UM8329TIBT require an external
clock.
Pin Configuration
Block Diagram
DSKD
FDCSEl
MINI
DENS
SEPClK
SEPD
WDOUT
HlT/ClK
ClKOUT
GND
VCC
P2
Pl
PO
TEST
HlD
lATE
EARLY
WDIN
XTAl/
ClKIN
6-34

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