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XRT81L27IV Datasheet(PDF) 5 Page - Exar Corporation |
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XRT81L27IV Datasheet(HTML) 5 Page - Exar Corporation |
5 / 30 page áç áç áç áç XRT81L27 SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY REV. 1.1.0 3 PIN DESCRIPTIONS NOTE: I -H indicates an input pin with a 50k Ω pull-up Resistor, I-L indicates an input pin with a 50kΩ pull-down resistor. PIN #NAME TYPE DESCRIPTION 1 RClk_0 O Receiver 0 Clock Output 2 LOS_0 O Receiver 0 Loss of Signal: This signal is asserted "High" to indicate loss of signal at the receive input. 3 RST LBEN I-H Reset (Active-low): (Host Mode) “Low” Resets the register contents to zero. Loop-back Enable (Active-low): (Hardware Mode) “Low” for Loop-back mode enable. 4 RTIP_0 I Receiver 0 Bipolar Positive Input: 5 RRING_0 I Receiver 0 Bipolar Negative Input: 6 PDTx_0 I-H Power-down Transmitter 0: This pin is operational for both Host or Hardware Mode. This pin MUST be pulled “Low” to enable TTIP_0 and TRING_0 output buffers. Pull this pin "High" to power-down channel 0 transmitter and set TTIP_0 and TRING_0 outputs to high impedance. 7 TTIP_0 O Transmitter 0 Tip Output: Positive bipolar data output to the line 8 TVDD_0 Vdd Transmitter 0 Positive Supply (3.3V± 5%) 9 TRING_0 O Transmitter 0 Ring Output: Negative bipolar data output to the line. 10 TGND_0 Gnd Transmitter 0 Supply Ground 11 PDTx_2 I-H Power-down Transmitter 2: (see pin 6) 12 TTIP_2 O Transmitter 2 Tip Output: Positive bipolar data output to the line. 13 TVDD_2 Vdd Transmitter 2 Positive Supply(3.3V± 5%) 14 TRING_2 O Transmitter 2 Ring Output: Negative bipolar data output to the line. 15 TGND_2 Gnd Transmitter 2 Supply Ground. 16 AVDD AVdd Analog Positive Supply(3.3V± 5%) 17 RTIP_2 I Receiver 2 Bipolar Positive Input: 18 RRING_2 I Receiver 2 Bipolar Negative Input: 19 AGND Gnd Analog Supply Ground. 20 RTIP_4 I Receiver 4 Bipolar Positive Input: 21 RRING_4 I Receiver 4 Bipolar Negative Input: 22 PDTx_4 I-H Power-down Transmitter 4: (see pin 6) 23 TTIP_4 O Transmitter 4 Tip Output: Positive bipolar data output to the line. 24 TVDD_4 Vdd Transmitter 4 Positive Supply(3.3V± 5%) 25 TRING_4 O Transmitter 4 Ring Output: Negative bipolar data output to the line. |
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