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MC100ES6221 Arkusz danych(PDF) 8 Page - Freescale Semiconductor, Inc |
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MC100ES6221 Arkusz danych(HTML) 8 Page - Freescale Semiconductor, Inc |
8 / 12 page Advanced Clock Drivers Devices 8 Freescale Semiconductor MC100ES6221 APPLICATIONS INFORMATION Understanding the Junction Temperature Range of the MC100ES6221 To make the optimum use of high clock frequency and low skew capabilities of the MC100ES6221, the MC100ES6221 is specified, characterized and tested for the junction temperature range of TJ =0°C to +110°C. Because the exact thermal performance depends on the PCB type, design, thermal management and natural or forced air convection, the junction temperature provides an exact way to correlate the application specific conditions to the published performance data of this data sheet. The correlation of the junction temperature range to the application ambient temperature range and vice versa can be done by calculation: TJ = TA + Rthja ⋅ Ptot Assuming a thermal resistance (junction to ambient) of 17 °C/W (2s2p board, 200 ft/min airflow, see Table 8) and a typical power consumption of 1148 mW (all outputs terminated 50 ohms to VTT, VCC = 3.3 V, frequency independent), the junction temperature of the MC100ES6221 is approximately TA + 21°C, and the minimum ambient temperature in this example case calculates to –21 °C (the maximum ambient temperature is 89 °C. See Table 8). Exceeding the minimum junction temperature specification of the MC100ES6221 does not have a significant impact on the device functionality. However, the continuous use the MC100ES6221 at high ambient temperatures requires thermal management to not exceed the specified maximum junction temperature. Please see the application note AN1545 for a power consumption calculation guideline. Maintaining Lowest Device Skew The MC100ES6221 guarantees low output-to-output bank skew of 50 ps and a part-to-part skew of max. 270 ps. To ensure low skew clock signals in the application, both outputs of any differential output pair need to be terminated identically, even if only one output is used. When fewer than all nine output pairs are used, identical termination of all output pairs within the output bank is recommended. This will reduce the device power consumption while maintaining minimum output skew. Power Supply Bypassing The MC100ES6221 is a mixed analog/digital product. The differential architecture of the MC100ES6221 supports low noise signal operation at high frequencies. In order to maintain its superior signal quality, all VCC pins should be bypassed by high-frequency ceramic capacitors connected to GND. If the spectral frequencies of the internally generated switching noise on the supply pins cross the series resonant point of an individual bypass capacitor, its overall impedance begins to look inductive and thus increases with increasing frequency. The parallel capacitor combination shown ensures that a low impedance path to ground exists for frequencies well above the noise bandwidth. Figure 5. VCC Power Supply Bypass Table 8. Ambient Temperature Ranges (Ptot = 1148 mW) Rthja (2s2p board) TA, min (1) 1. The MC100ES6221 device function is guaranteed from TA = –40°C to TJ = 110°C TA, max Natural convection 20 °C/W –23 °C87°C 100 ft/min 18 °C/W –21 °C89°C 200 ft/min 17 °C/W –20 °C90°C 400 ft/min 16 °C/W –18 °C92°C 800 ft/min 15 °C/W –17 °C93°C VCC MC100ES6221 VCC 33...100 nF 0.1 nF |
Podobny numer części - MC100ES6221 |
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Podobny opis - MC100ES6221 |
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