概览
描述
The 840NT4 is a PLL-based clock generator designed to interface with Freescale B4/T4 Processor systems. The clock generator offers low jitter, low-skew clock outputs, frequency margining (0.025MHz to 0.312MHz step granularity), and spread spectrum clocking that meets the ever-growing demands of Freescale’s next-generation processors.
特性
- Ten LVCMOS clock outputs: four system clocks, four DDR clocks, one RTC output, and one 25MHz reference clock
- Selectable input reference: crystal oscillator interface or differential LVPECL input
- Output frequency range: 25MHz to 200MHz
- Serial interface: I2C programmable
- Frequency margining in < 0.312MHz steps
- Spread spectrum for EMI reduction
- VCO range: 2GHz to 2.4GHz
- Voltage supply modes:
Core (VDD, VDDXTAL, VDDA) all core voltages must be identical
Output (VDDO_A,VDDO_B, VDDO_C, VDDO_REF0, VDDO_REF1)
Core/Output
3.3V/3.3V
3.3V/2.5V
3.3V/1.8V
2.5V/2.5V
2.5V/1.8V - Output voltage levels are independently selectable
- -40 °C to 85 °C ambient operating temperature
- Lead-free (RoHS 6) packaging
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应用
设计和开发
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