• Single chip low cost solution for synchronizing an Ethernet PHY to a standard telecom clock
• Generates an IEEE 802.3 jitter compliant 25 MHz Gigabit Ethernet output clock
• Supports three modes of operation: Asynchronous Freerun, Synchronous, and Asynchronous Holdover
• In Asynchronous Freerun mode, the DPLL generates an output clock with a frequency accuracy equal to frequency accuracy of the external crystal oscillator (XO) or a low cost crystal (XTAL)
• In Synchronous mode, the DPLL automatically synchronizes to one of a pre-defined set of frequencies including 2 kHz, 8 kHz, 64 kHz, 1.544 MHz, 2.048 MHz, 6.48 MHz, 8.192 MHz, 16.384 MHz, 19.44 MHz, 38.88 MHz, 77.76 MHz.
• Configurable to accept a 25 MHz input reference
• Automatic entry into Asynchronous Holdover mode when all input references fail
• Lock indicator pin
• Input reference status monitors
• Programmable loop bandwidth of 14 Hz, 28 Hz, or 890 Hz

The ZL30107 provides timing and synchronization for Ethernet line cards in next-generation networking equipment supporting circuit services over IP-based architectures. Integrating independent analog and digital PLLs, the device synchronizes with standard telecom and Ethernet clocks and generates an IEEE 802.3 jitter compliant 25 MHz Gigabit Ethernet output clock. Backed by Microchip's leading timing and synchronization expertise, no competing device can match the performance and level of integration at the price point supported by the ZL30107 device.