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843251BGI-15LF

Description
IC clock generator 750mhz 8tssop
Categorysemiconductor    Analog mixed-signal IC   
File Size447KB,20 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
Environmental Compliance  
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843251BGI-15LF Overview

IC clock generator 750mhz 8tssop

FemtoClock
®
Crystal-to-3.3V, 2.5V
LVPECL Clock Generator
843251I-15
DATA SHEET
General Description
The 843251I-15 is an Ethernet Clock Generator. The 843251I-15
uses an 18pF parallel resonant crystal over the range of 23.2MHz -
30MHz. For Ethernet applications, a 25MHz crystal is used. The
843251I-15 uses IDT’s 3
rd
generation low phase noise VCO
technology, and can achieve <1ps rms phase jitter performance over
the 1.875MHz – 20MHz integration range. The 843251I-15 is
packaged in a small 8-pin TSSOP, making it ideal for use in systems
with limited board space.
Features
One differential 3.3V LVPECL output pair
Crystal oscillator interface, 18pF parallel resonant crystal
(23.2MHz – 30MHz)
Output frequency range: 116MHz – 150MHz and
580MHz – 750MHz
VCO range: 580MHz – 750MHz
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz – 20MHz): 0.45ps (typical), 3.3V
Full 3.3V or 2.5V supply modes
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package
Common Configuration Table
Inputs
Crystal Frequency (MHz)
25
26.667
25
26.667
FREQ_SEL
1
1
0
0
M
25
25
25
25
N
1
1
5
5
Multiplication Value
M/N
25
25
5
5
Output Frequency (MHz)
625
666.67
125
133.33
Block Diagram
FREQ_SEL
Pulldown
Pin Assignment
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
FREQ_SEL
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
580MHz - 750MHz
FREQ_SEL N
1
÷1
0
(default)
÷5
Q
nQ
M = ÷25
(fixed)
843251I-15
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
843251I-15 REVISION B 10/29/15
1
©2015 Integrated Device Technology, Inc.

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