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XRT83SL30IV Datasheet(PDF) 9 Page - Exar Corporation |
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XRT83SL30IV Datasheet(HTML) 9 Page - Exar Corporation |
9 / 76 page áç áç áç áç XRT83SL30 SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR PRELIMINARY REV. P1.0.4 6 TRANSMITTER SIGNAL NAME PIN #TYPE DESCRIPTION TTIP 8 O Transmitter Tip Output Positive differential transmit output to the line. TRING 10 O Transmitter Ring Output Negative differential transmit output to the line. TPOS TDATA 61 I Transmitter Positive Data Input In dual-rail mode, this signal is the positive-rail input data for the transmitter. Transmitter Data Input In single-rail mode, this pin is used as the NRZ input data for the transmitter. NOTE: Internally pulled “Low” with a 50k Ω resistor. TNEG CODES 62 I Transmitter Negative NRZ Data Input In dual-rail mode, this signal is the negative-rail input data for the transmitter. In single-rail mode, this pin can be left unconnected. Coding Select In Hardware Mode and with single-rail mode selected, connecting this pin "Low" enables HDB3 in E1 or B8ZS in T1 encoding and decoding. Connect- ing this pin "High" selects AMI data format. NOTE: Internally pulled “Low” with a 50k Ω resistor. TCLK 60 I Transmitter Clock Input E1 rate at 2.048MHz ± 50ppm T1 rate at 1.544MHz ± 32ppm During normal operation, both in Host Mode and Hardware Mode, TCLK is used for sampling input data at TPOS/TDATA and TNEG/CODES while MCLK is used as the timing reference for the transmit pulse shaping circuit. TCLKE 57 I Transmit Clock Edge In Hardware Mode, with this pin set to a "High", transmit input data is sam- pled at the rising edge of TCLK. With this pin tied "Low", input data are sam- pled at the falling edge of TCLK. NOTE: Internally pulled “Low” with a 50k Ω resistor. TXON 58 I Transmitter Turn On In Hardware Mode, setting this pin "High" turns on the Transmit Section. In this mode, when TXON = “0”, TTIP and TRING driver outputs will be tri- stated. In Host Mode, setting bit 5 (TXONCTL) to “1”, in Register 18 (12h), control of the transmitter output is transferred to the hardware pin TXON. NOTE: Internally pulled "Low" with a 50k Ω resistor. |
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