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PDF ( 数据手册 , 数据表 ) 843252AGLF

零件编号 843252AGLF
描述 ICS843252AGLF
制造商 Integrated Circuit System
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843252AGLF 数据手册, 描述, 功能
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/







843252AGLF pdf, 数据表
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843252
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
PARAMETER MEASUREMENT INFORMATION
2V
VCC,
V ,V
CCA CCO_A. _B
LVPECL
VEE
-1.3V±0.165V
SCOPE
Qx
nQx
nQx
Qx
nQy
Qy
t sk(o)
3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT
OUTPUT SKEW
Phase Noise Plot
www.DataSheet.co.kr
Phase Noise Mask
f1 Offset Frequency f2
RMS Jitter = Area Under the Masked Phase Noise Plot
Clock
20%
Outputs
80%
tR
80%
tF
VSW I N G
20%
RMS PHASE JITTER
OUTPUT RISE/FALL TIME
nQA, nQB
QA, QB
t PW
t
PERIOD
odc = t PW x 100%
t PERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD
843252AG
www.icst.com/products/hiperclocks.html
8
REV. A NOVEMBER 9, 2005
Datasheet pdf - http://www.DataSheet4U.net/














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