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841608

Part Number	841608
Manufacturer	Renesas
Description	Crystal-to-HCSL Clock Generator
Published	May 19, 2020
Detailed Description	FemtoClock® Crystal-to-HCSL Clock Generator 841608 Datasheet General Description The 841608 is an optimized PCIe and s...
Datasheet	841608 PDF File

Overview

FemtoClock® Crystal-to-HCSL Clock Generator 841608 Datasheet General Description The 841608 is an optimized PCIe and sRIO clock generator.
The device uses a 25MHz parallel crystal to generate 100MHz and 125MHz clock signals, replacing solutions requiring multiple oscillator and fanout buffer solutions.
The device has excellent phase jitter (< 1ps rms) suitable to clock components requiring precise and low-jitter PCIe or sRIO or both clock signals.
Designed for telecom, networking and industrial applications, the 841608 can also drive the high-speed sRIO and PCIe SerDes clock inputs of communication processors, DSPs, switches and bridges.
Features • Eight HCSL outputs: configurable for PCIe (100MHz) and sRIO (125MHz) clock signals • Selectable crystal oscillator interface, 25MHz, 18pF parallel resonant crystal or LVCMOS/LVTTL single-ended reference clock input • Supports the following output frequencies: 100MHz or 125MHz • VCO: 500MHz • PLL bypass and output enable • PCI Express (2.
5 Gb/S) and Gen 2 (5 Gb/s) jitter compliant • RMS phase jitter at 125MHz, using a 25MHz crystal (1.
875MHz – 20MHz): 0.
37ps (typical) • Full 3.
3V operating supply • -40°C to 85°C ambient operating temperature • Available in lead-free (RoHS 6) package Block Diagram XTAL_IN XTAL_OUT OSC 0 REF_IN Pulldown 1 REF_SEL Pulldown IREF BYPASS Pulldown FSEL Pulldown FemtoClock PLL VCO = 500MHz 1 0 ÷N ÷4 ÷5 (default) M = ÷20 MR/nOE Pulldown Pin Assignment FSEL IREF BYPASS VDDA REF_SEL REF_IN VDD GND Q0 nQ0 Q1 32 31 30 29 28 27 26 25 nQ1 XTAL_IN 1 24 VDD XTAL_OUT 2 Q2 MR/nOE 3 23 nQ7 22 Q7 nQ2 VDD 4 21 nQ6 Q0 5 Q3 nQ0 6 20 Q6 19 GND nQ3 Q1 7 18 nQ5 nQ1 8 17 Q5 Q4 9 10 11 12 13 14 15 16 nQ4 nQ4 Q4 VDD nQ3 Q3 nQ2 Q2 GND Q5 841608 nQ5 32-Lead VFQFPN Q6 5mm x 5mm x 0.
925mm package body K Package nQ6 Top View Q7 nQ7 ©2023 Renesas Electronics Corporation 1 January 31, 2023 841608 Datasheet Pin Description and Pin Characteristic Tables Table 1.
Pin...

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