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844625BYILFT

Description
Clock Synthesizer / Jitter Cleaner Crystal-to-LVDS Clock Synthesizer
Categorysemiconductor    Analog mixed-signal IC   
File Size360KB,23 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
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844625BYILFT Overview

Clock Synthesizer / Jitter Cleaner Crystal-to-LVDS Clock Synthesizer

844625BYILFT Parametric

Parameter NameAttribute value
Product CategoryClock Synthesizer / Jitter Cleaner
ManufacturerIDT (Integrated Device Technology, Inc.)
RoHSDetails
Package / CasePTQFP-48
PackagingCut Tape
PackagingReel
Height1 mm
Length7 mm
Moisture SensitiveYes
Factory Pack Quantity1000
Width7 mm
Crystal-to-LVDS Clock Synthesizer
ICS844625I
DATA SHEET
General Description
The ICS844625I is a high frequency clock generator. The
ICS844625I uses an external 25MHz crystal to synthesize
312.5MHz, 156.25MHz and 125MHz clocks. The ICS844625I has
excellent cycle-to-cycle and RMS period jitter performance.
The ICS844625I operates at full 3.3V, 2.5V or mixed 3.3V, 2.5V
supply modes and is available in a fully RoHS compliant 48-lead
TQFP, E-Pad package.
Features
Ten selectable differential LVDS outputs
Output frequencies of 312.5MHz, 156.25MHz or 125MHz using a
25MHz crystal.
Crystal oscillator interface designed for 18pF, 25MHz parallel
resonant crystal
Cycle-to-cycle jitter: 13ps (typical)
RMS phase jitter at 125MHz (1.875MHz - 20MHz):
0.417ps (typical), V
DD
= 3.3V
RMS phase jitter at 156.25MHz (1.875MHz - 20MHz):
0.387ps (typical), V
DD
= 3.3V
Output duty cycle: 50%, (typical)
Supply modes:
V
DD
/ V
DDA
/ V
DDO
3.3V / 3.3V / 3.3V
2.5V / 2.5V / 2.5V
3.3V / 3.3V / 2.5V
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package
Frequency Table for Bank A, B and C Outputs
Crystal Frequency (MHz)
25
25
25
Feedback Divider
25
25
25
VCO Frequency (MHz)
625
625
625
Output Divider
÷2
÷4
÷5
Output Frequency (MHz)
312.5
156.25
125
Pin Assignment
V
DD
REF_CLK
GND
BYPASS
MR
nc
SELA0
SELA1
V
DDA
QA0
nQA0
V
DDO
XTAL_IN
XTAL_OUT
GND
SELC0
SELC1
OEA
V
DD
OEB
OEC
SELB0
SELB1
GND
48 47 46 45 44 43 42 41 40 39 38 37
36
35
34
33
5
48 Lead TQFP, E-Pad
32
6
31
7mm x 7mm x 1.0mm
30
7
package body
8
29
9
28
Y Package
10
27
Top View
11
26
12
25
13 14 15 16 17 18 19 20 21 22 23 24
1
2
3
4
ICS844625I
QA1
nQA1
QA2
nQA2
V
DDO
GND
QA3
nQA3
QA4
nQA4
QA5
nQA5
QC1
nQC0
QC0
nc
V
DDO
nQB1
QB1
nQB0
QB0
V
DDO
nQC1
ICS844625BYI REVISION A NOVEMBER 12, 2012
1
©2012 Integrated Device Technology, Inc.
V
DDO

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