Description
The 843N571I is a PLL based clock synthesizer for use in Ethernet
applications. The device uses IDT’s fourth generation FemtoClock®
NG technology for optimal high clock frequency and low phase noise
performance, combined with a low power consumption and high
power supply noise rejection. Using IDT’s latest FemtoClock NG PLL
technology, the 843N571I achieves <0.3ps RMS phase jitter
performance.
843N571I can synthesize 100MHz, 125MHz, 156.25MHz and a low
frequency 33.33MHz CPU clock from a single device. Six LVCMOS
outputs also serve as additional buffering of the 25MHz crystal
reference.
Features
• Fourth generation FemtoClock® Next Generation (NG) technology
• Seven single-ended LVCMOS outputs, 30 output impedance
• Three LVPECL output pairs
One differential LVPECL (QA, nQA) output pair: 156.25MHz
Two selectable differential LVPECL output pairs (QB, nQB and
QC, nQC): 100MHz and 125MHz
• One single-ended LVCMOS (QD0) 33.33MHz CPU clock
• Selectable external crystal or single-ended input source
• Crystal oscillator interface designed for 25MHz, parallel resonant
crystal
• FemtoClock NG frequency multiplier provides low jitter, high
frequency output
• FemtoClock NG VCO frequency: 2.5GHz
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(12kHz – 20MHz): 0.283ps (typical)
• Power supply noise rejection PSNR: -80dB
• 3.3V supply voltage
• -40C to 85C ambient operating temperature
• Lead-free (RoHS 6) packaging