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DP83953 датащи(PDF) 5 Page - National Semiconductor (TI) |
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DP83953 датащи(HTML) 5 Page - National Semiconductor (TI) |
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5 / 90 page ![]() 5 www.national.com 2.0 Pin Descriptions TP = Twisted Pair interface compatible, TT = TTL compatible, I = Input, O = Output, Analog = current dependent effect, AL = AUI Level, AD = AUI Drive Pin Name Pin No. Driver Type I/O Description Network Interface Pins RXI2- to RXI13- TP I Twisted Pair Receive Input Negative RXI2+ to RXI13+ TP I Twisted Pair Receive Input Positive TXO2- to TXO13- TP O Twisted Pair Transmit Output Negative TXO2+ to TXO13+ TP O Twisted Pair Transmit Output Positive FILTTL 153 TT I FILter/TTL: This pin can be utilized for the PCB diagnostic pur- poses. 0: Normal repeater operation 1: Differential transmit signals change to TTL level +TX and de- layed +TX. REQ 4 Analog I Equalization Resistor: A resistor connected between this pin and GND or VDD adjusts the equalization step amplitude on the Manchester encoded transmit data. Care must be taken to ensure system timing integrity when using cable lengths greater than 100m. The value here is dependent upon board layout. RTX 5 Analog I Extended Cable Resistor: A resistor connected between this pin and GND or VDD adjusts the amplitude of the differential transmit outputs. Care must be taken to ensure system timing integrity when using cable lengths greater than 100m. The value here is dependent upon board layout. AUI Port CD1+ 111 AL I AUI Collision Detect Input Positive CD1- 112 AL I AUI Collision Detect Input Negative RX1+ 113 AL I AUI Receive Input Positive RX1- 114 AL I AUI Receive Input Negative TX1+ 109 AD O AUI Transmit Output Positive TX1- 110 AD O AUI Transmit Output Negative |
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