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IDT IDT8V89316 Ethernet PLL & IEEE 1588 Synthesizer

IDT's IDT8V89316 Ethernet PLL & IEEE 1588 Synthesizer is used to frequency synchronize equipment with an Ethernet connected reference; its integrated DCO (Digitally Controlled Oscillator) can be controlled by an external IEEE 1588 clock recovery servo to synthesize IEEE 1588-based clocks. The IDT8V89316 low jitter output clocks can be used to directly time Gigabit Ethernet PHYs and QSGMII devices. The IDT8V89316 synchronization functions are provided by a Digital PLL (DPLL) with an embedded clock synthesizer. The DPLL accepts three single ended reference inputs that can operate at 25MHz, 125MHz or 156.25MHz. The references are continually monitored for loss of signal and for frequency offset per user programmed thresholds. The active reference for the DPLL is determined by forced selection or by automatic selection based on user programmed priorities and locking allowances and based on the reference monitors.
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