Overview
Description
The 840N051I is a LVCMOS/LVTTL clock synthesizer designed for SDH/SONET and Ethernet applications. The device generates a selectable 156.25MHz or 77.76MHz clock signal with excellent phase jitter performance. It uses Renesas' fourth generation FemtoClock® NG technology for an optimum of high clock frequency, low phase noise performance and low power consumption. The device supports 2.5V or 3.3V voltage supply and is packaged in a small, lead-free (RoHS 6) 8-lead TSSOP package. The extended temperature range supports wireless infrastructure, telecommunication, and networking end equipment requirements.
Features
- Fourth generation FemtoClock NG technology
- 155.52MHz output clock synthesized from a 19.44MHz fundamental mode crystal
- One 2.5V or 3.3V LVCMOS/LVTTL clock output
- Crystal interface designed for a 12pF parallel resonant crystal
- RMS phase jitter at 155.52MHz, using a 19.44MHz crystal (12kHz to 20MHz): 0.482ps (maximum)
- RMS phase jitter at 156.25MHz, using a 19.53125MHz crystal (1.875MHz to 20MHz): 0.138ps (maximum)
- LVCMOS interface levels for the control inputs
- Full 2.5V or 3.3V supply voltage
- Lead-free (RoHS 6) packaging
- -40 °C to 85 °C ambient operating temperature
Comparison
Applications
Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
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