FDC37C78(2000) 데이터 시트보기 (PDF) - SMSC -> Microchip

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FDC37C78
(Rev.:2000)

Floppy Disk Controller

SMSC -> Microchip 

PIN NO.

NAME

40 CLOCK 1

39 CLOCK 2

7, 12, 19, Power

32

6, 18, 30, Ground

41

DESCRIPTION OF PIN FUNCTIONS

BUFFER

SYMBOL TYPE

DESCRIPTION

MISCELLANEOUS

X1

ICLK The external connection for a parallel

resonant 24 MHz crystal. A CMOS

compatible oscillator is required if crystal is

not used.

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.

VCC

Positive Supply Voltage.

GND

Ground Supply.

BUFFER TYPE DESCRIPTIONS

Note: These values are for 3.3V operation. See Operational Description for 3.3V/5V values.

BUFFER TYPE

I/O12

O12

OD20

OCLK

ICLK

I

IS

DESCRIPTION

Input/output. 12 mA sink; 6 mA source

Output. 12 mA sink; 6 mA source

Open drain. 20 mA sink

Output to external crystal

Input to Crystal Oscillator Circuit (CMOS levels)

Input TTL compatible.

Input with Schmitt Trigger

9

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