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DP83849I Datasheet(PDF) 16 Page - National Semiconductor (TI) |
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DP83849I Datasheet(HTML) 16 Page - National Semiconductor (TI) |
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16 / 106 page  16 www.national.com 1.8 10 Mb/s and 100 Mb/s PMD Interface 1.9 Special Connections 1.10 Power Supply Pins Signal Name Type Pin # Description TPTDM_A TPTDP_A TPTDM_B TPTDP_B I/O 26 27 36 35 10BASE-T or 100BASE-TX Transmit Data In 10BASE-T or 100BASE-TX: Differential common driver trans- mit output (PMD Output Pair). These differential outputs are auto- matically 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. TPRDM_A TPRDP_A TPRDM_B TPRDP_B I/O 23 24 39 38 10BASE-T or 100BASE-TX Receive Data In 10BASE-T or 100BASE-TX: Differential receive input (PMD In- put Pair). These differential inputs 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 32 Bias Resistor Connection: A 4.87 k Ω 1% resistor should be con- nected from RBIAS to GND. PFBOUT O 31 Power Feedback Output: Parallel caps, 10 µ F and 0.1µF, should be placed close to the PFBOUT. Connect this pin to PFBIN1 (pin 13), PFBIN2 (pin 27), PFBIN3 (pin35), PFBIN4 (pin 49). See Section 5.4 for proper placement pin. PFBIN1 PFBIN2 PFBIN3 PFBIN4 I 7 28 34 54 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. Signal Name Pin # Description IOVDD1, IOVDD2, IOVDD3, IOVDD4 11,51,65,78 I/O 3.3V Supply IOGND1, IOGND2, IOGND3, IOGND4 10,52,64,77 I/O Ground COREGND1, COREGND2 6,55 Core Ground CDGND1, CDGND2 25,37 CD Ground ANA33VDD 30 Analog 3.3V Supply ANAGND1, ANAGND2, ANAGND3, ANAGND4 22,29,33,40 Analog Ground |
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