ICS843004 Datasheet, PDF (1/16 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ LVCMOS/CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843004
FEMTOCLOCKS™ LVCMOS/CRYSTAL-TO-
3.3V LVPECL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS843004 is a 4 output LVPECL synthesizer
ICS
optimized to generate Fibre Channel reference
HiPerClockS™ _{clock frequencies and is a member of the}
HiPerClocks^TM family of high performance clock
solutions from ICS. Using a 26.5625MHz 18pF
parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL[1:0]):
212.5MHz, 187.5MHz, 159.375MHz, 156.25, 106.25MHz, and
53.125MHz. The ICS843004 uses ICS’ 3^rd generation low phase
noise VCO technology and can achieve 1ps or lower typical
rms phase jitter, easily meeting Fibre Channel jitter requirements.
The ICS843004 is packaged in a small 24-pin TSSOP package.
FEATURES
• Four 3.3V LVPECL outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 212.5MHz,
187.5MHz, 159.375MHz, 156.25, 106.25MHz, 53.125MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal
(637KHz - 10MHz): 0.72ps (typical)
• RMS phase noise at 212.5MHz (typical)
Phase noise:
Offset
Noise Power
100Hz ............... -95.0 dBc/Hz
1KHz .............. -114.3 dBc/Hz
10KHz .............. -123.8 dBc/Hz
100KHz .............. -124.6 dBc/Hz
• Full 3.3V supply mode
• -30°C to 85°C ambient operating temperature
FREQUENCY SELECT FUNCTION TABLE
Input
Frequency
26.5625
26.5625
26.5625
26.5625
26.04166
23.4375
F_SEL1
0
Inputs
F_SEL0
M Divider
Value
0
24
0
1
24
1
0
24
1
1
24
0
1
24
0
0
24
N Divider
Value
3
4
6
12
4
3
Output
M/N
Frequency
Divider Value ^(MHz)
8
212.5
6
159.375
4
106.25
2
53.125
6
156.25
8
187.5
BLOCK DIAGRAM
F_SEL[1:0] ^Pulldown
nPLL_SEL ^Pulldown
TEST_CLK ^Pulldown
1
26.5625MHz
XTAL_IN
OSC
0
XTAL_OUT
nXTAL_SEL ^Pulldown
2
Phase
Detector
1
VCO
637.5MHz
(w/26.5625MHz
0
Reference)
F_SEL[1:0]
0 0 ÷3
0 1 ÷4
1 0 ÷6
1 1 ÷12
M = 24 (fixed)
MR ^Pulldown
843004AG
www.icst.com/products/hiperclocks.html
1
PIN ASSIGNMENT
nQ1 1
Q1 2
VCCo 3
Q0 4
nQ0 ⁵
MR ⁶
nPLL_SEL ⁷
nc ⁸
VCCA ⁹
F_SEL0 ¹⁰
VCC ¹¹
F_SEL1 ¹²
24 nQ2
23 Q2
2 2 VCCO
21 Q3
20 nQ3
1 9 VEE
18 nc
17 nXTAL_SEL
16 _{TEST_CLK}
1 5 _VEE
14 _{XTAL_IN}
13 _{XTAL_OUT}
ICS843004
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
package body
G Package
Q0
Top View
nQO
Q1
nQ1
Q2
nQ2
Q3
nQ3
REV. A NOVEMBER 18, 2004