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KSZ8721CL Datasheet(PDF) 8 Page - Micrel Semiconductor |
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KSZ8721CL Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 33 page KS8721CL Micrel, Inc. M9999-041405 8 April 2005 Pin Number Pin Name Type(1) Pin Function 31 VDDRX P Analog 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for details. 32 RX- I Receive Input. Differential receive input pins for 100FX, 100BASE-TX, or 10BASE-T. 33 RX+ I Receive Input: Differential receive input pin for 100FX, 100BASE-TX, or 10BASE-T. 34 FXSD/FXEN Ipd/O Fiber Mode Enable / Signal Detect in Fiber Mode. If FXEN = 0, FX mode is disable. The default is “0”. See “100BT FX Mode” section for more details. 35 GND GND Ground. 36 GND GND Ground. 37 REXT I External resistor (6.49kW ) connects to REXT and GND. 38 VDDRCV P Analog 2.5V power supply. 2.5V power output of voltage regulator. See “Circuit Design Ref. for Power Supply” section for details. 39 GND GND Ground. 40 TX- O Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T. 41 TX+ O Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T. 42 VDDTX P Transmitter 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for details. 43 GND GND Ground. 44 GND GND Ground. 45 XO O XTAL feedback: Used with XI for Xtal application. 46 XI I Crystal Oscillator Input: Input for a crystal or an external 25MHz clock. If an oscillator is used, XI connects to a 3.3V tolerant oscillator, and X2 is a no- connect. 47 VDDPLL P Analog PLL 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for details. 48 RST# Ipu Chip Reset. Active low, minimum of 50µs pulse is required. Notes: 1. P = Power supply. GND = Ground. I = Input. I/O = Bidirectional. Ipd = Input w/ internal pull-down. Ipd/O = Input w/ internal pull-down during reset, output pin otherwise. Ipu = Input w/ internal pull-up. Ipu/O = Input w/ internal pull-up during reset, output pin otherwise. O = Output. |
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