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UM8326 Datasheet Preview

UM8326 Datasheet

Floppy Disk Data Separator

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UM8326 pdf
eUMC
UM8326/8326B
Floppy Disk Data Separator (FDDS)"""" '.I,,',,:::,,,;,,,,.,,,::,,!,,,,,:,:, "",":' "'!,
Features
• Performs complete data separation function for floppy
disk drives
• Separates FM or MF M encoded data from any magnetic
media
• Eliminates several SSI and MSI devices normally used
for data separation
• No critical adjustments required
• Compatible with standard microsysterns' FDC 1791,
FDC 1793 and other floppy disk controllers
• Small 8-pin dual-in-line package
• +5 Volt only power supply
• TTL compatible inputs and outputs
General Description
The Floppy Disk Data Separator provides a low cost
solution to the problem of converting a single stream of
pulses from a floppy disk drive into separate clock and
data inputs for a Floppy Disk Controller.
The FDDS consists primarily of a clock divider, a long-term
timing corrector, a short-term timing corrector, and re-
clocking circuitry. Sypplied in an 8-pin Dual-in-Line
package to save board real estate, the FDDS operates on
+5 volts only and is TTL compatible on all inputs and
outputs.
The UM8326 is available in two versions; the UM8326,
which is intended for 514" disks and the UM8326B for
514" and 8" disks.
Pin Configuration
Block Diagram
vDD
SEPD
CDl
CDO
REFCLK
-CDO
--CDl
CLOCK
DIVIDER
- + 5V
- GND
-DSKD
EDGE
~ DATA/CLOCK '---
PULSE
~ SEPCLK
r - - -SEPARATION
REGENERATION
U ,. -LOGIC
LOGIC
SEPD
DETECTIOI\
LOGIC
6-29



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UMC

UM8326 Datasheet Preview

UM8326 Datasheet

Floppy Disk Data Separator

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UM8326 pdf
Absolute Maximum Ratings*
Operating Temperature Range . . . . . . . . . . OOC to + 70°C
Storage Temperature Range . . . . . . . . -55°C to + 150°C
Positive Voltage on any Pin, with respect to ground
................................. +8.0V
Negative Voltage on any Pin, with respect to ground
................................ -0.3V
Note:
When powering this device from laboratory or system
power supplies, it is important that the Absolute Maximum
Ratings not be exceeded or device failure can result. Some
power supplies exhibit voltage spikes or "glitches" on their
UM8326/8326B
outputs when the AC power is switched on and off. In
addition, voltage transients on the AC power line may
appear on the DC output. If this possibility exists it is
suggested that a clamp circuit be used.
*Comments
Stresses above those listed may cause permanent damage
to the device. This is a stress rating only and functional
operation of the device at these or at any other condition
above those indicated in the operational sections of this
specification is not implied.
Electrical Characteristics
D.C. CHARACTERISTICS (TA = OoC to 70°C, Voo = +5V ± 5%, unless otherwise noted)
Parameter
Min. Typ.
Max.
Units
INPUT VOLTAGE LEVELS
Low Level V IL
High Level VIH
OUTPUT VOLTAGE LEVELS
Low Level VOL
High Level VOH
INPUT CURRENT
Leakage IlL
INPUT CAPACITANCE
All Inputs
POWER SUPPLY CURRENT
100
2.0
2.4
0.8 V
V
0.4 V
V
10 IlA
10 pF
60 mA
Conditions
IOL = 1.6 mA
IOH = -1001lA
O~VIN ~Voo
A.C. CHARACTERISTICS
Symbol
Parameter
fCY
fCY
tCKH
tCKL
tSOON
tSOOFF
tSPCK
tOLL
tOLH
REFCLK Frequency
REFCLK Frequency
REFCLK High Time
REFCLK Low Time
I
REFCLK to SEPD "ON" Delay
REFCLK to SEPD "OFF" Delay
REFCLK to SEPCLK Delay
DSKD Active Low Time
DSKD Active High Time
Min.
0.2
0.2
50
50
0.1
0.2
Typ.
100
100
Max.
4.3
8.3
2500
2500
100
100
100
Units
MHz
MHz
ns
ns
ns
ns
ns
Ils
Ils
Conditions
UM8326
UM8326B
6-30


Part Number UM8326
Description Floppy Disk Data Separator
Maker UMC
Total Page 5 Pages
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