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MC100ES8111 Datenblatt(PDF) 6 Page - Motorola, Inc |
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MC100ES8111 Datenblatt(HTML) 6 Page - Motorola, Inc |
6 / 12 page Advanced Clock Drivers Device Data 6 Freescale Semiconductor MC100ES8111 Freescale Confidential Proprietary NDA Required / Preliminary APPLICATIONS INFORMATION Test Reference and Output Termination The MC100ES8111 is designed for high-frequency and low-skew clock distribution. The high-speed differential outputs are capable of driving 50 Ω transmission lines and always require a DC termination to VTT (GND). In order to maintain the tight skew and timing specifications, it is recommend to terminate the differential outputs by 50 Ω to GND, with the termination resistor located as close as possible to the end of the clock transmission line. All DC and AC specifications apply to this termination method (see the reference circuit shown in Figure 3 “MC100ES8111 AC Test Reference”). The MC100ES8111 does not support an output termination to VTT = VX = 0.75 V (center voltage termination). Figure 3. MC100ES8111 AC Test Reference Power Consumption and the Junction Temperature The power consumption PTOT of the MC100ES8111 depends on the supply voltages and the DC output termination. The clock frequency has a negligible effect on PTOT. If all outputs are terminated by 50 Ω to GND, the device power consumption is calculated by: PTOT = VCC · ICC + ICCO · (VCCO - VX) For instance, at a supply voltage of VCC = 3.3 V and a termination of 50 Ω to GND, the typical device power consumption is 579 mW at VCCO = 1.8 V and 474 mW at VCCO = 1.5 V. To make the optimum use of high clock frequency and low skew capabilities of the MC100ES8111, the device 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 datasheet. 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 54.4°C/W (2s2p board, 100 ft/min airflow, see Table 8) and a typical power consumption of 575 mW (all outputs terminated 50 ohms to GND, VCCO = 1.8 V), the junction temperature of the MC100ES8111 is approximately TA + 31°C, and the minimum ambient temperature in this example case calculates to -31°C (the maximum ambient temperature is 79°C. See Table 8). Exceeding the minimum junction temperature specification of the MC100ES8111 does not have a significant impact on the device functionality. However, the continuous use the MC100ES8111 at high ambient temperatures requires thermal management to not exceed the specified maximum junction temperature. Maintaining Lowest Device Skew The MC100ES8111 guarantees low output-to-output skew of max. 80 ps and a part-to-part skew of max. 630 ps (VCCO = 1.8 V). 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 ten output pairs are used, identical termination of all output pairs within the output bank (same package side) is recommended. If an entire output bank is not used, it is recommended to leave all of these outputs open and unterminated. This will reduce the device power consumption while maintaining minimum output skew. Z = 50 Ω RT = 50 Ω DUT MC100ES8111 Differential Pulse Generator Z = 50 Ω RT = 50 Ω VTT = GND VTT = GND VCC = 3.3 V ± 5% VCCO = 1.8 V ± 0.1 V or 1.5 V ± 0. 1 V Z = 50 Ω Oscilloscope or Tester Table 7. Power Consumption MC100ES8111 PTOT, TYP (1) 1. Typical case: VCC, VCCO at nominal values and using typical ICC, ICCO data. PTOT, MAX (2) 2. Worst case: VCC, VCC at max. values and using max. ICC, ICCO limits. VCCO = 1.5 V 470 mW 647 mW VCCO = 1.8 V 575 mW 769 mW Table 8. Ambient Temperature Ranges (Ptot = 575 mW) Rthja (2s2p board) TA, min (1) 1. The MC100ES8111 device function is guaranteed from TA = -40°C to TJ = 110°C. TA, max Natural convection 59.0 °C/W -34 °C 76 °C 100 ft/min 54.4 °C/W -31 °C 79 °C 200 ft/min 52.5 °C/W -30 °C 80 °C 400 ft/min 50.4 °C/W -29 °C 81 °C 800 ft/min 47.8 °C/W -27.5 °C 82.5 °C |
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Ähnliche Beschreibung - MC100ES8111 |
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