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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83848JSQ датащи(PDF) 14 Page - Texas Instruments |
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DP83848JSQ датащи(HTML) 14 Page - Texas Instruments |
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14 / 80 page  13 www.national.com 1.7 10 MB/S AND 100 MB/S PMD INTERFACE 1.8 SPECIAL CONNECTIONS 1.9 POWER SUPPLY PINS Signal Name Type Pin # Description TD-, TD+ I/O 14, 15 Differential common driver transmit output (PMD Output Pair). These differential outputs are automatically configured to either 10BASE-T or 100BASE-TX signaling. In Auto-MDIX mode of operation, this pair can be used as the Re- ceive Input pair. These pins require 3.3V bias for operation. RD-, RD+ I/O 11, 12 Differential receive input (PMD Input Pair). These differential in- puts are automatically configured to accept either 100BASE-TX or 10BASE-T signaling. In Auto-MDIX mode of operation, this pair can be used as the Transmit Output pair. These pins require 3.3V bias for operation. Signal Name Type Pin # Description RBIAS I 20 Bias Resistor Connection. A 4.87 k Ω 1% resistor should be con- nected from RBIAS to GND. PFBOUT O 19 Power Feedback Output. Parallel caps, 10 µ F (Tantalum pre- ferred) and 0.1 µF, should be placed close to the PFBOUT. Con- nect this pin to PFBIN1 (pin 16) and PFBIN2 (pin 30). See Section 5.4 for proper placement pin. PFBIN1 PFBIN2 I16 30 Power Feedback Input. These pins are fed with power from PFBOUT pin. A small capacitor of 0.1 µF should be connected close to each pin. Note: Do not supply power to these pins other than from PFBOUT. RESERVED I/O 8,9,10 RESERVED: These pins must be left unconnected. Signal Name Pin # Description IOVDD33 1, 26 I/O 3.3V Supply IOGND 40 I/O Ground DGND 29 Digital Ground AVDD33 18 Analog 3.3V Supply AGND 13, 17 Analog Ground |
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