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MPC980 Datasheet(PDF) 4 Page - Motorola, Inc |
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MPC980 Datasheet(HTML) 4 Page - Motorola, Inc |
4 / 7 page MPC980 MOTOROLA ECLinPS and ECLinPS Lite DL140 — Rev 3 4 DC CHARACTERISTICS (TA = 0° to 70°C) Symbol Characteristic Min Typ Max Unit Condition VCC Power Supply Voltage 3.3–5% 3.3 3.3+5% V VIL Input LOW Voltage 0.3VCC V VIH Input HIGH Voltage 0.7VCC VCC V VOH Output HIGH Voltage VCC –0.4 V –20mA (Note 1.) VOL Output LOW Voltage 0.4 V +20mA (Note 1.) CIN Input Capacitance 4.5 pF CPD Power Dissipation Capacitance 25 pF ICC Quiescent Supply Current 190 mA ICCA PLL Supply Current 20 mA 1. Output can drive two series terminated 50 Ω transmission lines or a single 50Ω line terminated 50Ω into VCC/2. AC CHARACTERISTICS (TA = 0° to 70°C, VCC = 3.3V ±5%) Symbol Characteristic Min Typ Max Unit Condition fXtal Input Crystal Frequency 14.31818 MHz fmax Maximum Output Frequency QP QPCI 66 33 MHz tdc Output Duty Cycle tCYCLE/2 –1000 tCYCLE/2 ±500 tCYCLE/2 +1000 ps tjitter Cycle–to–Cycle Jitter 66/33MHz (Peak–to–Peak) 60/30MHz 50/25MHz ±150 ±200 ±250 ps tskew Output–to–Output Skew QP to QP QPCI to QPCI QP to QPCI 350 350 500 ps Rising Edges Only; Dly_PCI = 0 tdelay Time Delay QP to QPCI 2 1 4fQP 1 4fQP ) 1 ns Dly_PCI = 1 tr, tf Output Rise/Fall Time 0.05 0.8 ns 1.0 to 1.8V tLOCK PLL Lock Time 10 ms tPZL, tPZH Output Enable Time 3 10 ns 50 Ω to VCC/2 tPLZ, tPHZ Output Disable Time 4 11 ns 50 Ω to VCC/2 APPLICATIONS INFORMATION Using the On–Board Crystal Oscillator The MPC980 features an on–board crystal Oscillator to allow for seed clock generation as well as final distribution. The on–board Oscillator is completely self contained so that the only external component required is the crystal. As the Oscillator is somewhat sensitive to loading on its inputs the user is advised to mount the crystal as close to the MPC980 as possible to avoid any board level parasitics. To facilitate co–location surface mount crystals are recommended, but not required. The Oscillator circuit is a series resonant circuit as opposed to the more common parallel resonant circuit, this eliminates the need for large on–board capacitors. Because the design is a series resonant design for the optimum frequency accuracy a series resonant crystal should be used (see specification table below). Unfortunately most off the shelf crystals are characterized in a parallel resonant mode. However a parallel resonant crystal is physically no different than a series resonant crystal, a parallel resonant crystal is simply a crystal which has been characterized in its parallel |
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