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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) 117 Page - Texas Instruments |
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XIO2001IPNP датащи(HTML) 117 Page - Texas Instruments |
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117 / 131 page  XIO2001 www.ti.com SCPS212D – MAY 2009 – REVISED JANUARY 2010 PCI Express Differential Transmitter Output Ranges (continued) PARAMETER TERMINALS MIN NOM MAX UNIT COMMENTS ZTX-DIFF_DC TXP, TXN 80 120 Ω Low impedance defined during signaling. DC differential TX impedance VTX-CM-AC-P (7) TXP, TXN 20 mV TX AC common mode voltage ITX-SHORT The total current transmitter can supply when shorted to TXP, TXN 90 mA Transmitter short-circuit current limit ground. VTX-DC-CM The allowed DC common-mode voltage at the transmitter TXP, TXN 0 3.6 V Transmitter DC common-mode voltage pins under any conditions. |VTX-CM-DC – VTX-CM-Idle-DC| ≤ 100 mV VTX-CM-DC-ACTIVE-IDLE-DELTA VTX-CM-DC = DC(avg) of |VTXP + VTXN|/2 [during L0] Absolute delta of DC common mode TXP, TXN 0 100 mV VTX-CM-Idle-DC = DC(avg) of |VTXP + VTXN|/2 [during electrical voltage during L0 and electrical idle idle] VTX-CM-DC-LINE-DELTA |VTXP-CM-DC – VTXN-CM-DC| ≤25 mV when Absolute delta of DC common mode TXP, TXN 0 25 mV VTXP-CM-DC = DC(avg) of |VTXP| [during L0] voltage between P and N VTXN-CM-DC = DC(avg) of |VTXN| [during L0] VTX-IDLE-DIFF-AC-p Electrical idle differential peak output TXP, TXN 0 20 mV VTX-IDLE-DIFFp = |VTXP-Idle – VTXN-Idle| ≤ 20 mV voltage VTX-RCV-DETECT The total amount of voltage change that a transmitter can The amount of voltage change allowed TXP, TXN 600 mV apply to sense whether a low impedance receiver is during receiver detection present. TTX-IDLE-MIN TXP, TXN 20 ns Minimum time a transmitter must be in electrical idle. Minimum time spent in electrical idle After sending the required number of EIOSs, the TTX-IDLE-SET-TO-IDLE transmitter must meet all electrical idle specifications Maximum time to transition to a valid TXP, TXN 8 ns within this time. This is measured from the end of the last electrical idle after sending an EIOS EIOS to the transmitter in electrical idle. TTX-IDLE-TO-DIFF-DATA Maximum time to transistion to valid diff signaling after Maximum time to transition to a valid diff TXP, TXN 8 ns leaving electrical idle. This is considered a debounce time signaling after leaving electrical idle to the Tx. All transmitters shall be AC coupled. The AC coupling is CTX TXP, TXN 75 200 nF required either within the media or within the transmitting AC coupling capacitor component itself. (7) Measurement is made over at least 10 UI. 7.5 PCI Express Differential Receiver Input Ranges PARAMETER TERMINALS MIN NOM MAX UNIT COMMENTS UI (1) Each UI is 400 ps ±300 ppm. UI does not account for RXP, RXN 399.88 400.12 ps Unit interval SSC dictated variations. VRX-DIFF-PP-CC (2) RXP, RXN 0.175 1.200 V VRX-DIFFp-p = 2*|VRXP – VRXN| Differential input peak-to-peak voltage The maximum interconnect media and transmitter jitter TRX-EYE (2) (3) RXP, RXN 0.4 UI that can be tolerated by the receiver is derived as Minimum receiver eye width TRX-MAX-JITTER = 1 – TRX-EYE = 0.6 UI Jitter is defined as the measurement variation of the crossing points (VRX-DIFFp-p = 0 V) in relation to TRX-EYE-MEDIAN-to-MAX-JITTER (2) (3) recovered TX UI. A recovered TX UI is calculated over Maximum time between the jitter median RXP, RXN 0.3 UI 3500 consecutive UIs of sample data. Jitter is and maximum deviation from the median measured using all edges of the 250 consecutive UIs in the center of the 3500 UIs used for calculating the TX UI. (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. Copyright © 2009–2010, Texas Instruments Incorporated Electrical Characteristics 117 Submit Documentation Feedback Product Folder Link(s): XIO2001 |
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