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DS90CR482 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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DS90CR482 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 21 page Chipset RSKM Characteristics Over recommended operating supply and temperature ranges unless otherwise specified.(Notes 4, 7). See Applications Infor- mation section for more details on this parameter and how to apply it. Symbol Parameter Min Typ Max Units RSKM Receiver Skew Margin without Deskew in non-DC Balance Mode, (Figure 13), (Note 5) f = 112 MHz 170 ps f = 100 MHz 170 240 ps f = 85MHz 300 350 ps f = 66MHz 300 350 ps RSKM Receiver Skew Margin without Deskew in DC Balance Mode, (Figure 13), (Note 5) f = 112 MHz 170 ps f = 100 MHz 170 200 ps f = 85 MHz 250 300 ps f = 66 MHz 250 300 ps RSKMD Receiver Skew Margin with Deskew in DC Balance, (Figure 14), (Note 6) f=33to80 MHz 0.25TBIT ps RDR Receiver Deskew Range f = 80 MHz ± 1 TBIT RDSS Receiver Deskew Step Size f = 80 MHz 0.3 TBIT ns Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation. Note 2: Typical values are given for VCC = 3.3V and T A = +25˚C. Note 3: Current into device pins is defined as positive. Current out of device pins is defined as negative. Voltages are referenced to ground unless otherwise specified (except VTH,VTL,VOD and ∆VOD). Note 4: The Minimum and Maximum Limits are based on statistical analysis of the device performance over voltage and temperature ranges. This parameter is functionally tested on Automatic Test Equipment (ATE). ATE is limited to 85MHz. A sample of characterization parts have been bench tested to verify functional performance. Note 5: Receiver Skew Margin (RSKM) is defined as the valid data sampling region at the receiver inputs. This margin takes into account transmitter output pulse positions (min and max) and the receiver input setup and hold time (internal data sampling window, RSPOS). This margin allows for LVDS interconnect skew, inter-symbol interference (both dependent on type/length of cable) and clock jitter (TJCC). RSKM ≥ cable skew (type, length) + source clock jitter (cycle to cycle,TJCC) + ISI (if any). See Applications Information section for more details. Note 6: Receiver Skew Margin with Deskew (RSKMD) is defined as the valid data sampling region at the receiver inputs. The DESKEW function will constrain the receiver’s sampling strobes to the middle half of the LVDS bit and removes (adjusts for) fixed interconnect skew. This margin (RSKMD) allows for inter-symbol interference (dependent on type/length of cable), Transmitter Pulse Position (TPPOS) variance, and LVDS clock jitter (TJCC). RSKMD ≥ ISI + TPPOS(variance) + source clock jitter (cycle to cycle, TJCC). See Applications Information section for more details. Note 7: Typical values for RSKM and RSKMD are applicable for fixed VCC and T A of the Transmitter and Receiver (both are assumed to be at the same VCC and T A points). www.national.com 6 |
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