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MPC8323VRAFDC Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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MPC8323VRAFDC Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 80 page MPC8323E PowerQUICC™ II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0 Freescale Semiconductor 11 Clock Input Timing NOTE AVDDn (1.0 V) is estimated to consume 0.05 W (under normal operating conditions and ambient temperature). 4 Clock Input Timing This section provides the clock input DC and AC electrical characteristics for the MPC8323E. 4.1 DC Electrical Characteristics Table 7 provides the clock input (CLKIN/PCI_SYNC_IN) DC timing specifications for the MPC8323E. 4.2 AC Electrical Characteristics The primary clock source for the MPC8323E can be one of two inputs, CLKIN or PCI_CLK, depending on whether the device is configured in PCI host or PCI agent mode. Table 8 provides the clock input (CLKIN/PCI_CLK) AC timing specifications for the MPC8323E. Table 7. CLKIN DC Electrical Characteristics Parameter Condition Symbol Min Max Unit Input high voltage — VIH 2.7 OVDD +0.3 V Input low voltage — VIL –0.3 0.4 V CLKIN input current 0 V ≤ VIN ≤ OVDD IIN —±5 μA PCI_SYNC_IN input current 0 V ≤ VIN ≤ 0.5 V or OVDD – 0.5 V ≤ VIN ≤ OVDD IIN —±5 μA PCI_SYNC_IN input current 0.5 V ≤ VIN ≤ OVDD – 0.5 V IIN —±50 μA Table 8. CLKIN AC Timing Specifications Parameter/Condition Symbol Min Typical Max Unit Notes CLKIN/PCI_CLK frequency fCLKIN 25 — 66.67 MHz 1 CLKIN/PCI_CLK cycle time tCLKIN 15 — — ns — CLKIN/PCI_CLK rise and fall time tKH, tKL 0.6 0.8 1.2 ns 2 CLKIN/PCI_CLK duty cycle tKHK/tCLKIN 40 — 60 % 3 CLKIN/PCI_CLK jitter — — — ±150 ps 4, 5 Notes: 1. Caution: The system, core, security, and QUICC Engine block must not exceed their respective maximum or minimum operating frequencies. 2. Rise and fall times for CLKIN/PCI_CLK are measured at 0.4 and 2.7 V. 3. Timing is guaranteed by design and characterization. 4. This represents the total input jitter—short term and long term—and is guaranteed by design. 5. The CLKIN/PCI_CLK driver’s closed loop jitter bandwidth should be <500 kHz at –20 dB. The bandwidth must be set low to allow cascade-connected PLL-based devices to track CLKIN drivers with the specified jitter. |
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