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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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COM20020ILJP датащи(PDF) 10 Page - Microchip Technology |
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COM20020ILJP датащи(HTML) 10 Page - Microchip Technology |
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10 / 72 page  5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM Datasheet Revision 12-05-06 Page 10 SMSC COM20020I Rev D DATASHEET PLCC PIN NO. NAME SYMBOL DESCRIPTION 21 nTransmit nEnable nTXEN Output. This signal is used prior to the Power-up to enable the line drivers for transmission. The polarity of the signal is programmable through the nPULSE2 pin. nPULSE2 floating before Power-up: nTXEN active low (Default option) nPULSE2 grounded before Power-up: nTXEN active high (This option is only available in Backplane Mode) 16,17 Crystal Oscillator XTAL1, XTAL2 An external crystal should be connected to these pins. Oscillation frequency range is from 10 to 20 MHz. If an external TTL clock is used instead, it must be connected to XTAL1 with a 390 Ω pull-up resistor, and XTAL2 should be left floating. 15,28 Power Supply VDD +5 Volt Power Supply pin. 7,14,22 Ground VSS Ground pin. |
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