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845264

Renesas
Part Number 845264
Manufacturer Renesas
Description Crystal-to-CML Clock Generator
Published May 19, 2020
Detailed Description FemtoClock®Crystal-to-CML Clock Generator 845264 DATA SHEET General Description The 845264 is a 3.3V, 2.5V CML clock g...
Datasheet PDF File 845264 PDF File

845264
845264

Overview
FemtoClock®Crystal-to-CML Clock Generator 845264 DATA SHEET General Description The 845264 is a 3.
3V, 2.
5V CML clock generator designed for Ethernet applications.
The device synthesizes four clock frequencies on two separately selectable output banks.
Each bank has either a 62.
5MHz, 125MHz, 156.
25MHz or 312.
5MHz clock signal with excellent phase jitter performance.
Each clock frequency is distributed to two low-skew differential CML output banks with a total of four outputs.
The device is suitable for driving the reference clocks of Ethernet PHYs.
The device supports 3.
3V and 2.
5V voltage supply and is packaged in a small, lead-free (RoHS 6) 32-lead VFQFN package.
The extended temperature range supports telecommunication, wireless infrastructure and networking end equipment requirements.
Features • Clock generation of: 62.
5MHz, 125MHz, 156.
25MHz and 312.
5MHz • Two banks of two differential CML clock outputs • Crystal interface designed for 25MHz, 12pF parallel resonant crystal • RMS phase jitter @ 125MHz, using a 25MHz crystal (1.
875MHz – 20MHz): 0.
486ps (typical) Offset Single-side Band Phase Noise 100Hz .
.
.
-97 dBc/Hz 1kHz.
-118 dBc/Hz 10kHz.
.
.
.
-125 dBc/Hz 100kHz.
.
-123 dBc/Hz • LVCMOS interface levels for the control inputs • Full 3.
3V and 2.
5V supply voltage • Lead-free (RoHS 6) 32 VFQFN packaging • -40°C to 85°C ambient operating temperature Block Diagram nOEA FSELA[1:0] Pulldown Pulldown XTAL_IN XTAL_OUT REF_CLK REF_SEL nBYPASS FSELB[1:0] nOEB OSC Pulldown Pulldown Pullup Pulldown Pulldown 0 Phase fREF Detector VCO 1 ÷25 0 ÷2, ÷4, ÷5, ÷10 1 ÷2, ÷4, ÷5, ÷10 Pin Assignment nc QA1 nQA1 GND QB1 nQB1 nOEB nc QA0 nQA0 QA1 nQA1 QB0 nQB0 QB1 nQB1 32 31 30 29 28 27 26 25 nQA0 1 24 nQB0 QA0 2 23 QB0 VDD 3 nOEA 4 845264 22 REF_SEL 21 FSELA1 nc 5 20 FSELA0 nc 6 19 FSELB1 nc 7 18 FSELB0 nc 8 17 VDD 9 10 11 12 13 14 15 16 nc VDDA nBY...


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