ICS840051 Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – FEMTOCLOCK CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
ICS840051
FEMTOCLOCKS™ CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS840051 is a Gigabit Ethernet Clock
Generator and a member of the HiPerClocks^TM
HiPerClockS™ _{family of high performance devices from ICS.}
The ICS840051 can synthesize 10 Gigabit
Ethernet, SONET, or Serial ATA reference clock
frequencies with the appropriate choice of crystal and
output divider. The ICS840051 has excellent phase jitter
performance and is packaged in a small 8-pin TSSOP,
making it ideal for use in systems with limited board space.
FEATURES
• 1 LVCMOS/LVTTL output, 15Ω output impedance
• Crystal oscillator interface designed for
18pF parallel resonant crystals
• Output frequency range: 70MHz - 170MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter at 155.52MHz (1.875MHz - 20MHz):
0.48ps (typical)
• RMS phase noise at 155.52MHz
Offset Noise Power
100Hz ............... -99.7 dBc/Hz
1KHz ................ -120 dBc/Hz
10KHz ................ -128 dBc/Hz
100KHz ................ -127 dBc/Hz
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Lead-Free fully RoHS compliant
• Industrial temperature information available upon request
FREQUENCY TABLE
Inputs
Crystal Frequency (MHz)
20.141601
20.141601
19.53125
19.53125
19.44
19.44
18.75
18.75
FREQ_SEL
0
1
0
1
0
1
0
1
Output Frequency
(MHz)
161.132812
80.566406
156.25
78.125
155.52
77.76
150
75
BLOCK DIAGRAM
OE ^Pullup
FREQ_SEL ^Pulldown
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
560MHz-680MHz
÷32
(fixed)
0 ÷4 (default)
1 ÷8
840051AG
www.icst.com/products/hiperclocks.html
1
PIN ASSIGNMENT
VDDA 1
8 VDD
OE 2
7 Q0
XTAL_OUT 3
6 GND
XTAL_IN 4
5 FREQ_SEL
Q0
ICS840051
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
REV. A JANUARY 14, 2005