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FDC37C78 データシート(PDF) 9 Page - SMSC Corporation

部品番号 FDC37C78
部品情報  Floppy Disk Controller
PDF  82 Pages
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メーカー  SMSC [SMSC Corporation]
ホームページ  http://www.smsc.com
Logo SMSC - SMSC Corporation

FDC37C78 データシート(HTML) 9 Page - SMSC Corporation

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9
DESCRIPTION OF PIN FUNCTIONS
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
MISCELLANEOUS
40
CLOCK 1
X1
ICLK
The
external
connection
for
a
parallel
resonant
24
MHz
crystal.
A
CMOS
compatible oscillator is required if crystal is
not used.
39
CLOCK 2
X2
OCLK
24 MHz crystal. If an external clock is used,
this pin should not be connected.
This pin
should not be used to drive any other drivers.
7, 12, 19,
32
Power
VCC
Positive Supply Voltage.
6, 18, 30,
41
Ground
GND
Ground Supply.
BUFFER TYPE DESCRIPTIONS
Note: These values are for 3
.3V operation. See Operational Description for 3.3V/5V values.
BUFFER TYPE
DESCRIPTION
I/O12
Input/output. 12 mA sink; 6 mA source
O12
Output. 12 mA sink; 6 mA source
OD20
Open drain. 20 mA sink
OCLK
Output to external crystal
ICLK
Input to Crystal Oscillator Circuit (CMOS levels)
I
Input TTL compatible.
IS
Input with Schmitt Trigger



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