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Integrated Device Technology Electronic Components Datasheet



ICS843301I-108

2.5V LVPECL 75MHZ FREQUENCY SYNTHESIZER W/SSC



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ICS843301I-108 pdf
PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL
75MHZ FREQUENCY SYNTHESIZER W/SSC
ICS843301I-108
GENERAL DESCRIPTION
The ICS843301I-108 is a 75MHz Frequency
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high perfor mance devices from IDT.
The ICS843301I-108 uses a 20MHz crystal to
synthesize 75MHz output. The device supports
0.5% downspread spread spectrum clocking. The ICS843301I-
108 has excellent <1ps phase jitter performance, over an
integration range of 900kHz - 7.5MHz. The device is packaged
in a small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
FEATURES
One differential 3.3V or 2.5V LVPECL output
Crystal oscillator interface designed for 20MHz,
18pF parallel resonant crystal
Output frequency: 75MHz
Supports SSC, 0.5% downspread
RMS phase jitter @ 75MHz, using a 20MHz crystal
(900kHz - 7.5MHz): 0.73ps (typical)
Full 3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
SSC FUNCTION TABLE
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SSC
0 (default)
1
Mode
SSC Off
0.5% Downspread
BLOCK DIAGRAM
PIN ASSIGNMENT
XTAL_IN
XTAL_OUT
20MHz
OSC
SSC Pulldown
Phase
Detector
VCO
600MHz
PLL
N Div
÷8
M Div
÷30
VCCA 1
8 VCC
VEE 2
7Q
XTAL_OUT 3
6 nQ
Q
XTAL_IN 4
5 SSC
nQ
ICS843301I-108
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT/ ICS3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 1
ICS843301BGI-108 REV. A OCTOBER 9, 2007



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ICS843301I-108 pdf
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
PRELIMINARY
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
VCCA
Power
2 VEE Power
3, 4
XTAL_OUT,
XTAL_IN
Input
Analog supply pin.
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
5
SSC
Input Pulldown SSC control pin. LVCMOS/LVTTL interface levels.
6, 7
nQ, Q
Output
Differential clock outputs. LVPECL interface levels.
8 VCC Power
Core and output supply pin.
NOTE: Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLDOWN
Parameter
Input Pin Capacitance
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
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IDT/ ICS3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 2
ICS843301BGI-108 REV. A OCTOBER 9, 2007



Part Number ICS843301I-108
Description 2.5V LVPECL 75MHZ FREQUENCY SYNTHESIZER W/SSC
Maker Integrated Device Technology - Integrated Device Technology
Total Page 15 Pages
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