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دیتاشیت - Integrated Circuit System - ICS843252AGLF

شماره قطعه 843252AGLF
شرح مفصل ICS843252AGLF
تولید کننده Integrated Circuit System 
آرم Integrated Circuit System 


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843252AGLF شرح
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843252
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS843252 is a 2 differential output LVPECL
ICS Synthesizer designed to generate Ethernet refer-
HiPerClockS™ ence clock frequencies and is a member of the
HiPerClocks™ family of high performance clock
solutions from ICS. Using a 19.53125MHz or
25MHz, 18pF parallel resonant crystal, the following frequen-
cies can be generated based on the settings of 4 frequency
select pins (SEL[A1:A0], SEL[B1:B0]): 625MHz, 312.5MHz,
156.25MHz, and 125MHz.
The two banks have their own dedicated frequency select
pins and can be independently set for the frequencies
mentioned above. The ICS843252 ICS’ 3rd generation
low phase noise VCO technology and can achieve 1ps or
lower typical rms phase jitter, easily meeting Ethernet
jitter requirements. The ICS843252 is packaged in a small
16-pin TSSOP package.
FEATURES
• Two 3.3V differential LVPECL output pairs
• Using a 19.53125MHz or 25MHz crystal, the two output
banks can be independently set for 625MHz, 312.5MHz,
156.25MHz or 125MHz
• Crystal oscillator interface
• VCO range: 490MHz to 680MHz
• RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz):
0.47ps (typical)
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature available upon request
• Available in both standard and lead-free RoHS-compliant
packages
www.DataSheet.co.kr
BLOCK DIAGRAM
SELA[0:1} Pullup
2
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
490MHz - 680MHz
FB_SEL Pulldown
SELB[0:1} Pullup
2
Feedback Divider
0 = ÷25 (default)
1 = ÷32
0 0 ÷1
0 1 ÷2
1 0 ÷3
1 1 ÷4 (default)
0 0 ÷2
0 1 ÷4
1 0 ÷5
1 1 ÷8 (default)
QA
nQA
QB
nQB
PIN ASSIGNMENT
nQB
QB
VCCO_B
SELB1
SELB0
VCCO_A
QA
nQA
1
2
3
4
5
6
7
8
16 XTAL_IN
15 XTAL_OUT
14 VEE
13 SELA1
12 SELA0
11 VCC
10 VCCA
9 FB_SEL
ICS843252
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on
initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications
without notice.
843252AG
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 9, 2005
1
Datasheet pdf - http://www.DataSheet4U.net/

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