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PCS2P99448G-32-LR Datasheet(PDF) 9 Page - PulseCore Semiconductor |
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PCS2P99448G-32-LR Datasheet(HTML) 9 Page - PulseCore Semiconductor |
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9 / 15 page  September 2006 PCS2I99448 rev 0.4 3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer 9 of 15 Notice: The information in this document is subject to change without notice. TJ, MAX should be selected according to the MTBF system requirements and Table 9. Rthja can be derived from Table 10. The Rthja represent data based on 1S2P boards, using 2S2P boards will result in lower thermal impedance than indicated below. Table 10. Thermal package impedance of the 32LQFP Convection, LFPM Rthja (1P2S board), °C/W Rthja (2P2S board), °C/W Still air 86 61 100 lfpm 76 56 200 lfpm 71 54 300 lfpm 68 53 400 lfpm 66 52 500 lfpm 60 49 If the calculated maximum frequency is below 350 MHz, it becomes the upper clock speed limit for the given application conditions. The following eight derating charts describe the safe frequency operation range for the PCS2I99448. The charts were calculated for a maximum tolerable die junction temperature of 110 °C (120°C), corresponding to an estimated MTBF of 9.1 years (4 years), a supply voltage of 3.3V and series terminated transmission line or capacitive loading. Depending on a given set of these operating conditions and the available device convection a decision on the maximum operating frequency can be made. 0 500 400 300 200 100 0 Convection Ifpm 50 100 150 200 250 300 350 Safe operation fMAX (AC) TA = 85°C Figure 5. Maximum PCS2I99448 frequency VCC = 3.3V, MTBF 9.1 years, driving series terminated transmission lines, 2s2p board 0 500 400 300 200 100 0 Convection Ifpm 50 100 150 200 250 300 350 Safe operation fMAX (AC) TA = 75°C TA = 85°C Figure 6. Maximum PCS2I99448 frequency VCC= 3.3V, MRBF 9.1 years, 4pF load per line, 2s2p board 0 500 400 300 200 100 0 Convection Ifpm 50 100 150 200 250 300 350 Safe operation fMAX (AC) TA = 85°C Figure 8. Maximum PCS2I99448 frequency VCC = 3.3V, MRBF 4 years, 4pF load per line, 2s2p board 0 500 400 300 200 100 0 Convection Ifpm 50 100 150 200 250 300 350 Safe operation fMAX (AC) Figure 7. No maximum frequency limitation for VCC = 3.3V, MTBF 4 years, driving series terminated transmission lines, 2s2p board |
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