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843252AG-45LF

Description
Clock Generators & Support Products XTAL TO LVPECL SYNTHESIZER
Categorysemiconductor    Analog mixed-signal IC   
File Size255KB,13 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
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843252AG-45LF Overview

Clock Generators & Support Products XTAL TO LVPECL SYNTHESIZER

843252AG-45LF Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerIDT (Integrated Device Technology, Inc.)
Product CategoryClock Generators & Support Products
RoHSDetails
Mounting StyleSMD/SMT
Package / CaseTSSOP-16
PackagingTube
Height1 mm
Length5 mm
Width4.4 mm
NumOfPackaging1
Factory Pack Quantity96
Unit Weight0.006102 oz
FemtoClock
®
Crystal-to-3.3V LVPECL
Frequency Synthesizer
843252-45
Datasheet
General Description
The 843252-45 is a 2 LVPECL output Synthesizer optimized to
generate Ethernet reference clock frequencies. Using a 25MHz,
18pF parallel resonant crystal, the following frequencies can be
generated: 156.25MHz and 125MHz. The 843252-45 uses IDT’s 3
rd
generation low phase noise VCO technology and can achieve 1ps
or lower typical rms phase jitter, easily meeting Ethernet jitter
requirements. The 843252-45 is packaged in a small 16-pin TSSOP
package.
Features
Two differential LVPECL output pairs
Crystal oscillator interface designed for a 25MHz, 18pF parallel
resonant crystal
A 25MHz crystal generates output frequencies of: 156.25MHz
and 125MHz
VCO frequency: 625MHz
RMS Phase Jitter @ 156.25MHz, (1.875MHz – 20MHz) using a
25MHz crystal: 0.54ps (typical)
Full 3.3V supply mode
0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) package
For functional replacement part us 8T49N241
Block Diagram
CLK_EN_A
Pullup
25MHz
Pin Assignment
125MHz
QA
÷5
nQA
156.25MHz
QB
÷4
Feedback Divider
÷25
nQB
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
625MHz
CLK_EN_A
V
EE
QA
nQA
V
CCOA
nc
V
CCA
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLK_EN_B
V
EE
QB
nQB
V
CCOB
XTAL_IN
XTAL_OUT
V
EE
CLK_EN_B
Pullup
843252-45
16-Lead TSSOP
4.4mm x 5.0mm x 0.925mm package body
G Package
©2016 Integrated Device Technology, Inc.
1
Revision B, November 7, 2016
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