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843252AGLF 데이터시트 PDF




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기능 ICS843252AGLF
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843252AGLF 데이터시트, 핀배열, 회로
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, 반도체, 판매, 대치품
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843252
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
TABLE 3B. BANK B FREQUENCY TABLE
Inputs
Crystal Frequency
(MHz)
25
20
25
24
20
25
25
24
20
19.44
15.625
19.44
18.75
15.625
15.625
19.44
18.75
15.625
FB_SEL
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
SELB1
0
0
0
0
0
1
1
1
1
0
0
0
0
0
1
1
1
1
SELB0
0
0
1
1
1
0
1
1
1
0
0
1
1
1
0
1
1
1
Feedback
Divider
25
25
25
25
25
25
25
25
25
32
32
32
32
32
32
32
www.DataSheet.co.kr
32
32
Bank B
Output Divider
2
2
4
4
4
5
8
8
8
2
2
4
4
4
5
8
8
8
M/N
Multiplication
Factor
12.5
12.5
6.25
6.25
6.25
5
3.125
3.125
3.125
16
16
8
8
8
6.4
4
4
4
QB/nQB
Output
Frequency
(MHz)
312.5
250
156.25
150
125
125
78.125
75
62.5
311.04
250
155.52
150
125
100
77.76
75
62.5
TABLE 3C. OUTPUT BANK CONFIGURATION SELECT FUNCTIONTABLES
Inputs
SELA1
SELA0
00
01
10
11
Outputs
QA
÷1
÷2
÷3
÷4 (default)
Inputs
SELB1
SELB0
00
01
10
11
Outputs
QB
÷2
÷4
÷5
÷8 (default)
TABLE 3D. FEEDBACK DIVIDER CONFIGURATION SELECT FUNCTION TABLE
FB_SEL
0
1
Inputs
Feedback Divide
÷25 (default)
÷32
843252AG
www.icst.com/products/hiperclocks.html
4
REV. A NOVEMBER 9, 2005
Datasheet pdf - http://www.DataSheet4U.net/

4페이지










843252AGLF 전자부품, 판매, 대치품
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843252
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
1k
TYPICAL PHASE NOISE AT 156.25MHZ
10Gb Ethernet Filter
156.25MHz
RMS Phase Jitter (Random)
1.875Mhz to 20MHz = 0.47ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
10Gb Ethernet Filter to raw data
10k
100k
1M
www.DataSheet.co.kr
OFFSET FREQUENCY (HZ)
10M
100M
843252AG
www.icst.com/products/hiperclocks.html
7
REV. A NOVEMBER 9, 2005
Datasheet pdf - http://www.DataSheet4U.net/

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843252AGLF

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