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XIO2000 数据表(PDF) 139 Page - Texas Instruments |
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XIO2000 数据表(HTML) 139 Page - Texas Instruments |
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139 / 150 page  Electrical Characteristics 127 November 2005 SCPS097B 7.4 PCI Express Differential Receiver Input Ranges PARAMETER TERMINALS MIN NOM MAX UNITS COMMENTS UI Unit interval RXP, RXN 399.88 400 400.12 ps Each UI is 400 ps ±300 ppm. UI does not account for SSC dictated variations. See Note 9. VRX-DIFFp-p Differential input peak-to-peak voltage RXP, RXN 0.175 1.200 V VRX-DIFFp-p = 2*|VRXP − VRXN| See Note 10. TRX-EYE Minimum receiver eye width RXP, RXN 0.4 UI The maximum interconnect media and transmitter jitter that can be tolerated by the receiver is derived as TRX-MAX- JITTER = 1 − TRX-EYE = 0.6 UI See Notes 10 and 11. TRX-EYE-MEDIAN-to-MAX- JITTER Maximum time between the jitter median and maximum deviation from the median. RXP, RXN 0.3 UI Jitter is defined as the measurement variation of the crossing points (VRX-DIFFp-p = 0 V) in relation to recovered TX UI. A recovered TX UI is calculated over 3500 consecutive UIs of sample data. Jitter is measured using all edges of the 250 consecutive UIs in the center of the 3500 UIs used for calculating the TX UI. See Notes 10 and 11. VRX-CM-ACp AC peak common mode input voltage RXP, RXN 150 mV VRX-CM-ACp = RMS(|VRXP + VRXN|/2 – VRX-CM-DC) VRX-CM-DC = DC(avg) of |VRXP + VRXN|/2 See Note 10. RLRX-DIFF Differential return loss RXP, RXN 10 dB Measured over 50 MHz to 1.25 GHz with the P and N lines biased at +300 mV and −300 mV, respectively. See Note 12. RLRX-CM Common mode return loss RXP, RXN 6 dB Measured over 50 MHz to 1.25 GHz with the P and N lines biased at +300 mV and −300 mV, respectively. See Note 12. ZRX-DIFF-DC DC differential input impedance RXP, RXN 80 100 120 Ω RX dc differential mode impedance See Note 13. ZRX-DC DC input impedance RXP, RXN 40 50 60 Ω Required RXP as well as RXN dc impedance (50 Ω ±20% tolerance) See Notes 10 and 13. ZRX-HIGH-IMP-DC Powered down dc input impedance RXP, RXN 200K Ω Required RXP as well as RXN dc impedance when the receiver terminations do not have power. See Note 14. VRX-IDLE-DET-DIFFp-p Electrical idle detect threshold RXP, RXN 65 175 mV VRX-IDLE-DET-DIFFp-p = 2 * |VRXP −VRXN| measured at the receiver package terminals TRX-IDLE-DET-DIFF-ENTER -TIME Unexpected electrical idle enter detect threshold integration time RXP, RXN 10 ms An unexpected electrical idle (VRX-DIFFp-p<VRX-IDLE-DET-DIFFp-p) must be recognizedno longer than TRX-IDLE-DET-DIFF-ENTER-TIME to signal an unexpected idle condition. NOTES: 9. No test load is necessarily associated with this value. 10. Specified at the measurement point and measured over any 250 consecutive UIs. A test load must be used as the RX device when taking measurements. If the clocks to the RX and TX are not derived from the same reference clock, then the TX UI recovered from 3500 consecutive UIs is used as a reference for the eye diagram. |
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