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XRT75R03IV Datasheet(PDF) 7 Page - Exar Corporation |
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XRT75R03IV Datasheet(HTML) 7 Page - Exar Corporation |
7 / 92 page xr XRT75R03 THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR REV. 1.0.7 4 PIN DESCRIPTIONS (BY FUNCTION) SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS PIN # SIGNAL NAME TYPE DESCRIPTION 38 1 125 TxON_0 TxON_1 TxON_2 I Transmitter ON Input - Channel 0: Transmitter ON Input - Channel 1: Transmitter ON Input - Channel 2: These input pins are used to either enable or disable the Transmit Output Driver corresponding to Channel_n. "Low" - Disables the Transmit Output Driver of the corresponding Channel. In this setting, the corresponding TTIP_n and TRING_n output pins will be tri-stated. "High" - Enables the Transmit Output Driver of the corresponding Channel. In this setting, the corresponding TTIP_n and TRING_n output pins will be enabled. NOTES: 1. Even when the XRT75R03 is configured in HOST mode, these pins will be active. To enable software control of the Transmit Output Driver outputs, pull these pins "High". 2. When Transmitters are turned off either in Host or Hardware mode, the TTIP and TRing outputs are Tri-stated. 3. These pins are internally pulled "High" 35 4 26 TxClk_0 TxClk_1 TxClk_2 I Transmit Clock Input - Channel 0: Transmit Clock Input f - Channel 1: Transmit Clock Input - Channel 2: These input pins have two functions: • They function as the timing source for the Transmit Section of the corresponding channel within the XRT75R03. • They also are used by the Transmit Section of the LIU IC to sample the corresponding TPDATA_n and TNDATA_n input pin. NOTE: The user is expected to supply a 44.736MHz ± 20ppm clock signal (for DS3 applications), 34.368MHz ± 20 ppm clock signal (for E3 applications) or a 51.84MHz ± 4.6ppm clock signal (for STS-1, Stratum 3E or better applications). |
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