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UM8329TのメーカーはUMCです、この部品の機能は「Floppy Disk Interface Circuit」です。 |
部品番号 | UM8329T |
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部品説明 | Floppy Disk Interface Circuit | ||
メーカ | UMC | ||
ロゴ | |||
このページの下部にプレビューとUM8329Tダウンロード(pdfファイル)リンクがあります。 Total 7 pages
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
1 Page A.C. ,Timing Characteristics
HLT/CLK (8272A MODE)
1--...01'/
1-4----- 4 or 8 MHz
UM832918329T183298/83298 T
WDOUT PU LSE WI DTH
-i= 'WDO~---
CLKOUT VS. WDIN TIMING
179X MODE
CLKOUT
~
/
,~------~;---
------------SS.WDIN ~ j,..-.------,~------
CLK8272OA(76U5A) TMOD~E
l-,2_,_or_4_u_se_c,_ _ __
,_
tdNEC
WDIN _ _ _ _ _ _ _ _ _ _ _ _ _ __
SET-UP TIME PO, Pl AND P2 TO WDIN
PO,Pl,P2
WDIN
t
ts
{
CLKOUT
CLKOUT~
~_ _ __
I--- tCIKOH ----I.
PRECOMPENSATION
CLKOUT
(179X)
CLKOUT
(8272A)
tWDE
WDOUT (EAR L Y) _ _-'I
WDOUT (NOMINAL) _ _--1_ _ _""'1
tWDL ~_ _ _ _ _ _ _ _, -
WDOUT (LATE)
Ref, to Fig, 2 for
tp (prtlcompensation)
value
6-36
3Pages UM832918329T183298/83298 T
Typical System Implementation - 8272A (765A) FOe
00-07
LATCH
16 MHz
ROY
lOY
WE
SIOESEL
1 - - - - - - - - - - - - - - - - - -....... MOTOR ON
* The UM8329T/BT, as all other Nry10S integrated circuits, presents a high impedance
on all inputls.
To avoid soft errors caused by transmission line effects and noise where there is long
cabling between the floppy dis~ drive and the controller board, the use of a (noninvertingl
TTL schmidt-trigger input gate or bus transceiver is recommended at the OSKO input to
the UM9229/B.
6-39
6 Page | |||
ページ | 合計 : 7 ページ | ||
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PDF ダウンロード | [ UM8329T データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
UM8329 | Floppy Disk Interface Circuit | UMC |
UM8329B | Floppy Disk Interface Circuit | UMC |
UM8329BT | Floppy Disk Interface Circuit | UMC |
UM8329T | Floppy Disk Interface Circuit | UMC |