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MC10H641FN Datasheet(PDF) 6 Page - ON Semiconductor |
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MC10H641FN Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 10 page MC10H641, MC100H641 http://onsemi.com 6 propagation delay for the device in question. A more common use would be to establish an ambient temperature range for the H641’s in the system and utilize the above methodology to determine the potential increased skew of the distribution network. Note that for this information if the TPD versus Temperature curve were linear the calculations would not be required. If the curve were linear over all temperatures a simple temperature coefficient could be provided. Figure 3. TPD versus Junction Temperature −30 JUNCTION TEMPERATURE ( 5.2 −10 10 30 50 70 90 110 130 °C) 5.4 5.6 5.8 6.0 6.2 6.4 TPHL TPLH VCC Dependence TTL and CMOS devices show a significant propagation delay dependence with VCC. Therefore the VCC variation in a system will have a direct impact on the total skew of the clock distribution network. When calculating the skew between two devices on a single board it is very likely an assumption of identical VCC’s can be made. In this case the number provided in the data sheet for part−to−part skew would be overly conservative. By using Figure 4 the skew given in the data sheet can be reduced to represent a smaller or zero variation in VCC. The delay variation due to the specified VCC variation is ≈ 270 ps. Therefore, the 1 ns window on the data sheet can be reduced by 270 ps if the devices in question will always experience the same VCC. The distribution of the propagation delay ranges given in the data sheet is actually a composite of three distributions whose means are separated by the fixed difference in propagation delay at the typical, minimum and maximum VCC. Figure 4. DTPD versus VCC 4.75 VCC (V) −140 4.85 4.95 5.05 5.15 5.25 −100 −60 −20 20 60 100 140 TPLH TPHL Capacitive Load Dependence As with VCC the propagation delay of a TTL output is intimately tied to variation in the load capacitance. The skew specifications given in the data sheet, of course, assume equal loading on all of the outputs. However situations could arise where this is an impossibility and it may be necessary to estimate the skew added by asymmetric loading. In addition the propagation delay numbers are provided only for 50 pF loads, thus necessitating a method of determining the propagation delay for alternative loads. Figure 5 shows the relationship between the two propagation delays with respect to the capacitive load on the output. Utilizing this graph and the 50 pF limits the specification of the H641 can be mapped into a spec for either a different value load or asymmetric loads. Figure 5. TPD versus Load 0 CAPACITIVE LOAD (pF) 0.75 10 20 30 40 50 60 70 80 90 100 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 TPHL TPLH MEASURED THEORETICAL |
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