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PTN3311 Datasheet(PDF) 5 Page - NXP Semiconductors |
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PTN3311 Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 7 page Philips Semiconductors Product data PTN3310/PTN3311 High-speed serial logic translators 2001 Jun 19 5 AC ELECTRICAL CHARACTERISTICS Symbol Parameter Conditions Min Typ Max Unit General fMAX Maximum throughput data rate 655 800 – Mbps tS Clock output skew, part-to-part – 100 – ps tSKEW Clock output pulse skew – 50 – ps t /t Propagation delay input (differential) to output – 1 3 ns tPLH/tPHL Propagation delay input (single-ended) to output – 1 3 ns PECL outputs (PTN3310) tr/tf Output rise and fall times at 20% and 80% intersects – 200 300 ps LVDS outputs (PTN3311); RL = 100 Ω; CL = 5 pF tTLH Transition time LOW to HIGH RL = 100 Ω; CL = 5 pF – 500 650 ps tTHL Transition time HIGH to LOW RL = 100 Ω; CL = 5 pF – 500 650 ps VOSS Peak-to-peak switching offset voltage Measured between two matched 49.9 Ω load resistors; 5 pF load capacitance – – 150 mV LVDS REFERENCE MEASUREMENT CONFIGURATION ST00041 PTN331x 1 5 2 6 3 7 4 8 CLVDS Rload Rload Vos Voutp Cprobe Cprobe Voutn Vod = Voutp – Voutn Rload = 50 Ohms CLVDS = 5 pF The above diagram shows the test set-up used when evaluating LVDS outputs. According to the TIA-EIA-644 Standard, the maximum lumped capacitance test load should be 5 pF. However, by using probes or cables to observe the signal, additional capacitance is added, which has an effect on the rise and fall times. Cprobe represents any capacitance caused by the use of probes or cables. Assuming balanced loading and balanced output drivers, the total effective capacitance seen by the part is: CEff = CLVDS + 1/2 Cprobe To correctly account for the effects of Cprobe, the following formula should be used: Dt + 5pF C Eff Dt measured, Where ∆t is the 20%–80% rise/fall time. To avoid the use of additional calculation of the measured results, a different approach could be taken; however, the value of Cprobe has to be known in advance. In that case, the value of CLVDS can be chosen such that the sum of the capacitances equals 5 pF, i.e.: CLVDS + 1/2 Cprobe = 5 pF |
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