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XIO2000 数据表(PDF) 138 Page - Texas Instruments |
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XIO2000 数据表(HTML) 138 Page - Texas Instruments |
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138 / 150 page  Electrical Characteristics 126 November 2005 SCPS097B PCI Express Differential Transmitter Output Ranges (continued) PARAMETER TERMINALS MIN NOM MAX UNITS COMMENTS ITX-SHORT TX short circuit current limit TXP, TXN 90 mA The total current the transmitter can provide when shorted to its ground. TTX-IDLE-MIN Minimum time spent in electrical idle TXP, TXN 50 UI Minimum time a transmitter must be in electrical idle. Utilized by the receiver to start looking for an electrical idle exit after successfully receiving an electrical idle ordered set. TTX-IDLE-SET-to-IDLE Maximum time to transition to a valid electrical idle after sending an electrical idle ordered set TXP, TXN 20 UI After sending an electrical idle ordered set, the transmitter must meet all electrical idle specifications within this time. This is considered a debounce time for the transmitter to meet electrical idle after transitioning from L0. TTX-IDLE-to-DIFF-DATA Maximum time to transition to valid TX specifications after leaving an electrical idle condition TXP, TXN 20 UI Maximum time to meet all TX specifications when transitioning from electrical idle to sending differential data. This is considered a debounce time for the TX to meet all TX specifications after leaving electrical idle. RLTX-DIFF Differential return loss TXP, TXN 10 dB Measured over 50 MHz to 1.25 GHz. See Note 7. RLTX-CM Common mode return loss TXP, TXN 6 dB Measured over 50 MHz to 1.25 GHz. See Note 7. ZTX-DIFF-DC DC differential TX impedance TXP, TXN 80 100 120 Ω TX dc differential mode low impedance ZTX-DC Transmitter dc impedance TXP, TXN 40 Ω Required TXP as well as TXN dc impedance during all states CTX AC coupling capacitor TXP, TXN 75 200 nF All transmitters are ac-coupled and are required on the PWB. NOTES: 4. No test load is necessarily associated with this value. 5. Specified at the measurement point into a timing and voltage compliance test load and measured over any 250 consecutive TX UIs. 6. A TTX-EYE = 0.75 UI provides for a total sum of deterministic and random jitter budget of TTX-JITTER-MAX = 0.25 UI for the transmitter collected over any 250 consecutive TX UIs. The TTX-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 TX 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. 7. The transmitter input impedance results in a differential return loss greater than or equal to 12 dB and a common mode return loss greater than or equal to 6 dB over a frequency range of 50 MHz to 1.25 GHz. This input impedance requirement applies to all valid input levels. The reference impedance for return loss measurements is 50 Ω to ground for both the P and N line. Note that the series capacitors CTX is optional for the return loss measurement. 8. Measured between 20% and 80% at transmitter package terminals into a test load for both VTXP and VTXN. |
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