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XRT73R06 Datasheet(PDF) 11 Page - Exar Corporation |
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XRT73R06 Datasheet(HTML) 11 Page - Exar Corporation |
11 / 68 page áç áç áç áç XRT73R06 SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT REV. 1.0.0 8 CLOCK INTERFACE LEAD # SIGNAL NAME TYPE DESCRIPTION E15 E3CLK I E3 Clock Input (34.368 MHz ± 20 ppm): If any of the channels is configured in E3 mode, a reference clock 34.368 MHz is applied on this pin. NOTE: In single frequency mode, this reference clock is not required. G16 DS3CLK I DS3 Clock Input (44.736 MHz ± 20 ppm): If any of the channels is configured in DS3 mode, a reference clock 44.736 MHz. is applied on this pin. NOTE: In single frequency mode, this reference clock is not required. C16 STS-1CLK/ 12M I STS-1 Clock Input (51.84 MHz ± 20 ppm): If any of the channels is configured in STS-1 mode, a reference clock 51.84 MHz is applied on this pin.. In Single Frequency Mode, a reference clock of 12.288 MHz ± 20 ppm is con- nected to this pin and the internal clock synthesizer generates the appropriate clock frequencies based on the configuration of the channels in E3, DS3 or STS-1 modes. L15 SFM_EN I Single Frequency Mode Enable: Tie this pin “High” to enable the Single Frequency Mode. A reference clock of 12.288 MHz ± 20 ppm is applied. In the Single Frequency Mode (SFM) a low jitter output clock is provided for each channel if the CLK_EN bit is set thus eliminating the need for a separate clock source for the framer. Tie this pin “Low” if single frequency mode is not selected. In this case, the appropriate reference clocks must be provided. NOTE: This pin is internally pulled down B1 T1 B17 T17 D11 P11 CLKOUT_0 CLKOUT_1 CLKOUT_2 CLKOUT_3 CLKOUT_4 CLKOUT_5 O Clock output for channel 0 Clock output for channel 1 Clock output for channel 2 Clock output for channel 3 Clock output for channel 4 Clock output for channel 5 Low jitter clock output for each channel based on the mode selection (E3,DS3 or STS-1) if the CLKOUTEN_n bit is set in the control register. This eliminates the need for a separate clock source for the framer. NOTES: 1. The maximum drive capability for the clockouts is 16 mA. 2. This clock out is available both in SFM and non-SFM modes. |
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