ICS849S625I Datasheet, PDF (1/24 Pages) Integrated Device Technology – Ten selectable differential LVPECL or LVDS outputs

Crystal-to-LVPECL/LVDS Clock Synthesizer ICS849S625I
DATA SHEET
General Description
Features
The ICS849S625I is a high frequency clock generator. The
ICS849S625I uses an external 25MHz crystal to synthesize
625MHz, 312.5MHz, 156.25MHz and 125MHz clocks. The
ICS849S625I has excellent cycle-to-cycle and RMS phase jitter
performance.
The ICS849S625I operates at full 3.3V supply mode and is available
in a fully RoHS compliant 48-lead TQFP, E-Pad package.
Frequency Table for Bank A, B and C Outputs
• Ten selectable differential LVPECL or LVDS outputs
• Output frequencies of 625MHz, 312.5MHz, 156.25MHz or
125MHz using a 25MHz crystal.
• Crystal interface designed for a 25MHz, parallel resonant crystal
• Cycle-to-cycle jitter: 25ps (maximum)
• RMS phase jitter at 156.25MHz (1MHz - 20MHz):
0.375ps (typical), LVDS outputs
• Output duty cycle: 53% (maximum)
• Full 3.3V supply mode
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) packaging
Crystal Frequency (MHz) M Feedback Divider VCO Frequency (MHz) Nx Output Divider
Output Frequency (MHz)
25
25
625
1
625
25
25
625
2
312.5
25
25
625
4
156.25
25
25
625
5
125
Pin Assignment
ICS849S625BYI REVISION A OCTOBER 1, 2012
XTAL_IN
XTAL_OUT
VEE
SELC0
SELC1
OEA
VCC
OEB
OEC
SELB0
SELB1
VEE
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
3
34
4
33
5 ICS849S625I 32
6
31
7
30
8
29
9
28
10
27
11
26
12
25
13 14 15 16 17 18 19 20 21 22 23 24
QA1
nQA1
QA2
nQA2
VCCO
VEE
QA3
nQA3
QA4
nQA4
QA5
nQA5
48 Lead TQFP, E-Pad
7mm x 7mm x 1.0mm package body
Y Package
Top View
1
©2012 Integrated Device Technology, Inc.