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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FDC37C78 датащи(PDF) 9 Page - SMSC Corporation |
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FDC37C78 датащи(HTML) 9 Page - SMSC Corporation |
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9 / 82 page  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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