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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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XIO2001IPNP датащи(PDF) 18 Page - Texas Instruments |
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XIO2001IPNP датащи(HTML) 18 Page - Texas Instruments |
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18 / 144 page  18 XIO2001 SCPS212I – MAY 2009 – REVISED JANUARY 2016 www.ti.com Product Folder Links: XIO2001 Submit Documentation Feedback Copyright © 2009–2016, Texas Instruments Incorporated PCI Express Differential Transmitter Output Ranges (continued) PARAMETER TERMINALS MIN NOM MAX UNIT COMMENTS (7) Measurement is made over at least 10 UI. VTX-CM-AC-P (7) TX AC common mode voltage TXP, TXN 20 mV ITX-SHORT Transmitter short-circuit current limit TXP, TXN 90 mA The total current transmitter can supply when shorted to ground. VTX-DC-CM Transmitter DC common-mode voltage TXP, TXN 0 3.6 V The allowed DC common-mode voltage at the transmitter pins under any conditions. VTX-CM-DC-ACTIVE-IDLE-DELTA Absolute delta of DC common mode voltage during L0 and electrical idle TXP, TXN 0 100 mV |VTX-CM-DC – VTX-CM-Idle-DC| ≤ 100 mV VTX-CM-DC = DC(avg) of |VTXP + VTXN|/2 [during L0] VTX-CM-Idle-DC = DC(avg) of |VTXP + VTXN|/2 [during electrical idle] VTX-CM-DC-LINE-DELTA Absolute delta of DC common mode voltage between P and N TXP, TXN 0 25 mV |VTXP-CM-DC – VTXN-CM-DC| ≤25 mV when VTXP-CM-DC = DC(avg) of |VTXP| [during L0] VTXN-CM-DC = DC(avg) of |VTXN| [during L0] VTX-IDLE-DIFF-AC-p Electrical idle differential peak output voltage TXP, TXN 0 20 mV VTX-IDLE-DIFFp = |VTXP-Idle – VTXN-Idle| ≤ 20 mV VTX-RCV-DETECT The amount of voltage change allowed during receiver detection TXP, TXN 600 mV The total amount of voltage change that a transmitter can apply to sense whether a low impedance receiver is present. TTX-IDLE-MIN Minimum time spent in electrical idle TXP, TXN 20 ns Minimum time a transmitter must be in electrical idle. TTX-IDLE-SET-TO-IDLE Maximum time to transition to a valid electrical idle after sending an EIOS TXP, TXN 8 ns After sending the required number of EIOSs, the transmitter must meet all electrical idle specifications within this time. This is measured from the end of the last EIOS to the transmitter in electrical idle. TTX-IDLE-TO-DIFF-DATA Maximum time to transition to a valid diff signaling after leaving electrical idle TXP, TXN 8 ns Maximum time to transistion to valid diff signaling after leaving electrical idle. This is considered a debounce time to the Tx. CTX AC coupling capacitor TXP, TXN 75 200 nF All transmitters shall be AC coupled. The AC coupling is required either within the media or within the transmitting component itself. (1) No test load is necessarily associated with this value. (2) 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. (3) A TRX-EYE = 0.40 UI provides for a total sum of 0.60 UI deterministic and random jitter budget for the transmitter and interconnect collected any 250 consecutive UIs. The TRX-EYE-MEDIAN-to-MAX-JITTER specification ensures a jitter distribution in which the median and the maximum deviation from the median is less than half of the total UI jitter budget collected over any 250 consecutive TX UIs. It must be noted that the median is not the same as the mean. The jitter median describes the point in time where the number of jitter points on either side is approximately equal as opposed to the averaged time value. 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 must be used as the reference for the eye diagram. (4) A single PLL bandwidth and peaking value of 1.5 to 22 MHz and 3 dB are defined. 6.7 PCI Express Differential Receiver Input Ranges PARAMETER TERMINALS MIN NOM MAX UNIT COMMENTS UI(1) Unit interval RXP, RXN 399.88 400.12 ps Each UI is 400 ps ±300 ppm. UI does not account for SSC dictated variations. VRX-DIFF-PP-CC (2) Differential input peak-to-peak voltage RXP, RXN 0.175 1.200 V VRX-DIFFp-p = 2*|VRXP – VRXN| TRX-EYE (2) (3) 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 TRX-EYE-MEDIAN-to-MAX-JITTER (2) (3) 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. BWRX-PLL-HI (4) Maximum Rx PLL bandwidth RXP, RXN 22 MHz Second order PLL jitter transfer bounding function. BWRX-PLL-LO-3DB (4) Minimum Rx PLL for 3 dB peaking RXP, RXN 1.5 MHz Second order PLL jitter transfer bounding function. |
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