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ICS8421004AGIT PDF预览

ICS8421004AGIT

更新时间: 2024-11-18 11:14:35
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描述
FEMTOCLOCKS? CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER

ICS8421004AGIT 数据手册

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PRELIMINARY  
ICS8421004I  
FEMTOCLOCKS™ CRYSTAL-TO-  
HSTL FREQUENCY SYNTHESIZER  
Integrated  
Circuit  
Systems, Inc.  
GENERAL DESCRIPTION  
FEATURES  
The ICS8421004I is a 4 output HSTL Synthesizer • Four HSTL outputs (VOHmax = 1.4)  
ICS  
optimized to generate Fibre Channel reference  
• Selectable crystal oscillator interface  
HiPerClockS™  
clock frequencies and is a member of the  
or LVCMOS/LVTTL single-ended input  
HiPerClocksTM family of high performance clock  
solutions from ICS. Using a 26.5625MHz 18pF  
• Supports the following output frequencies: 212.5MHz,  
parallel resonant crystal, the following frequencies can be  
generated based on the two frequency select pins (F_SEL[1:0]):  
212.5MHz, 187.5MHz, 159.375MHz, 156.25, 106.25MHz and  
53.125MHz. The ICS8421004I uses ICS’ 3rd generation low  
phase noise VCO technology and can achieve 1ps or lower  
typical rms phase jitter, easily meeting Fibre Channel jitter  
requirements.The ICS8421004I is packaged in a small 24-pin  
TSSOP package.  
187.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, 53.125MHz  
• VCO range: 560MHz - 680MHz  
• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal  
(637kHz - 10MHz): 0.59ps (typical)  
• Power supply modes:  
Core/Output  
3.3V/1.8V  
2.5V/1.8V  
• -40°C to 85°C ambient operating temperature  
FREQUENCY SELECT FUNCTION TABLE  
PIN ASSIGNMENT  
1
24  
23  
22  
21  
20  
19  
18  
nQ2  
Q2  
nQ1  
Q1  
Inputs  
Input  
Frequency  
(MHz)  
Output  
Frequency  
(MHz)  
2
M Divider N Divider  
M/N  
Divider Value  
3
4
VDDO  
Q0  
VDDO  
Q3  
F_SEL1 F_SEL0  
Value  
24  
Value  
3
5
26.5625  
26.5625  
26.5625  
26.5625  
26.04166  
23.4375  
0
0
1
1
0
0
0
1
0
1
1
0
8
6
4
2
6
8
212.5  
159.375  
106.25  
53.125  
156.25  
187.5  
nQ0  
nQ3  
6
MR  
GND  
24  
24  
24  
24  
24  
4
6
7
8
9
10  
11  
12  
nPLL_SEL  
nc  
nc  
17  
16  
15  
14  
13  
nXTAL_SEL  
VDDA  
TEST_CLK  
GND  
XTAL_IN  
12  
4
F_SEL0  
VDD  
F_SEL1  
XTAL_OUT  
3
ICS8421004I  
24-LeadTSSOP  
4.40mm x 7.8mm x 0.92mm  
BLOCK DIAGRAM  
F_SEL[1:0]  
Pulldown  
2
package body  
G Package  
TopView  
Pulldown  
nPLL_SEL  
Q0  
F_SEL[1:0]  
nQ0  
Pulldown  
TEST_CLK  
0 0 ÷3  
0 1 ÷4  
1 0 ÷6  
1 1 ÷12  
1
0
1
0
Q1  
26.5625MHz  
XTAL_IN  
nQ1  
Phase  
Detector  
VCO  
OSC  
XTAL_OUT  
Q2  
Pulldown  
nXTAL_SEL  
nQ2  
M = 24 (fixed)  
Q3  
nQ3  
Pulldown  
MR  
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.  
8421004AGI  
www.icst.com/products/hiperclocks.html  
REV. A MARCH 29, 2005  
1

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