8T79S308 Datasheet | IDT

Description The 8T79S308 is a fully integrated signal fanout buffer for high-performance, low additive phase noise applications. The main function of the device is the distribution and fanout of high-frequency clocks or low-frequency synchronization signals. The 8T79S308 is optimized to deliver very low phase noise clocks and precise, low-skew outputs, low device-to-device skew characteristics and fast output rise/fall times help the system design to achieve deterministic clock phase relationship across devices. The device distributes the input signals (IN_0, IN_1) to two fanout banks. A input select logic allows the device to operate as 1:8 buffer, dual 1:4 buffers, and to cross the input signals. The propagation delay in both outputs banks is designed for equal delay to support fixed phase relationships between both banks. All outputs are very flexible in LVPECL/LVDS output style configuration, output signal termination, and allow both DC and AC coupling. Outputs can be individually disabled through a serial interface. The device is packaged in a lead-free (Ro HS 6) 40-VFQFPN package. The extended temperature range supports wireless infrastructure, telemunication, and networking end equipment requirements. The 8T79S308 is a member of the high-performance clock family from IDT. Block Diagram IN_0 n IN_0 VT_0 IN_1 n IN_1 VT_1 XSEL[1:0] 50 50 50 50 Bank A QA0 n QA0 QA1 n QA1 QA2 n QA2 QA3 n QA3 POD_OE SDA SCL VSEL_I2C VSEL_VDD ADR[2:0] I2C Output Enable Register Bank B QB0 n QB0 QB1 n QB1 QB2 n QB2 QB3 n QB3 Features - High-performance, flexible clock/data/1PPS fanout buffer - Low phase noise floor: -160d Bc/Hz (156.256MHz clock) - Integrated phase noise of < 65fs RMS typical (12k Hz- 20MHz) - Flexible input selection - 1:8 Fanout modes - Dual 1:4 Buffer fanout modes - Eight differential outputs, organized in two banks of four outputs - Low-power LVPECL/LVDS outputs support DC and AC coupling and LVPECL, LVDS line terminations techniques - Individually configured outputs...