ICS813253BGLFT IDT, Integrated Device Technology Inc, ICS813253BGLFT Datasheet

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ICS813253BGLFT

Manufacturer Part Number
ICS813253BGLFT
Description
IC ATTENUATOR/XLATOR 24TSSOP
Manufacturer
IDT, Integrated Device Technology Inc
Series
HiPerClockS™, FemtoClock®r
Type
Fanout Distribution, Frequency Translator, Jitter Attenuator, Voltage Controlled Crystal Oscillator (VCXO)r
Datasheet
1.ICS813253BGLFT.pdf (22 pages)

Specifications of ICS813253BGLFT

Pll
Yes with Bypass
Input
HCSL, LVDS, LVHSTL, LVPECL, SSTL
Output
LVPECL
Number Of Circuits
1
Ratio - Input:output
2:3
Differential - Input:output
Yes/Yes
Frequency - Max
156.25MHz
Divider/multiplier
Yes/Yes
Voltage - Supply
2.375 V ~ 3.465 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
*
Frequency-max
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
813253BGLFT
FEMTOCLOCK™ JITTER ATTENUATOR &
FREQUENCY TRANSLATOR W/LVPECL OUTPUTS
G
and frequency translation. The device contains two internal
frequency multiplication stages that are cascaded in series. The
first stage is a VCXO PLL that is optimized to provide
reference clock jitter attenuation. The second stage is a
FemtoClock frequency multiplier that provides the low
jitter, high frequency Gigabit Ether net or PCI-Express
output clock.
Predivider and output divider multiplication ratios are selected
using device selection control pins. The multiplication ratios are
optimized to support most common clock rates used in Gigabit
Ethernet and PCI-Express applications. The VCXO requires
the use of an external, inexpensive pullable crystal. The VCXO
uses external passive loop filter components which allows
configuration of the PLL loop bandwidth and damping
characteristics.
B
nBypass
IDT
PSEL0
HiPerClockS™
FSEL0
PSEL1
FSEL1
IC S
nCLK
LOCK
ENERAL
CLK
™
OE
/ ICS
Pullup
Pulldown
Pullup/Pulldown
Pullup
Pullup
Pullup
Pullup
Pullup
™
JITTER ATTENUATOR/FREQUENCY TRANSLATOR
D
Ethernet and PCI-Express clock jitter attenuation
The ICS813253 is a member of the HiperClockS™
family of high performance clock solutions from
IDT. The ICS813253 is a PLL based synchronous
clock generator that is optimized for Gigabit
IAGRAM
D
ESCRIPTION
Pre-Divider
1, 2.5,
4, 5
VCXO Jitter Attenuation PLL
Detector
Loop Filter Input
Phase
External
VCXO
1
F
Three differential LVPECL outputs
One differential input supports the following input types:
LVPECL, LVDS, LVHSTL, SSTL, HCSL
Accepts input frequencies from 19.6MHz to 136MHz, includ-
ing: 25MHz, 62.5MHz, 100MHz and 125MHz input clocks
Attenuates the phase jitter of the input clock by using a low-
cost pullable funamental mode VCXO crystal
Outputs common Gigabit Ethernet or PCI-Express clock rates
VCXO PLL bandwidth can be optimized for jitter attenuation
and reference tracking using external loop filter connection
Absolute pull range: 110ppm
FemtoClock frequency multiplier provides low jitter,
high frequency output
FemtoClock range: 490MHz - 680MHz
RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.37ps (typical)
Full 3.3Vsupply, or 3.3V Core/2.5V output supply
0°C to 70°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
EATURES
4.40mm x 7.8mm x 0.92mm
P
IN
24-Lead TSSOP
ICS813253
A
Multiplier x25
package body
G Package
FemtoClock
Frequency
Top View
SSIGNMENT
ICS813253AG REV. A JANUARY 5, 2007
0
1
XTAL_OUT
XTAL_IN
2, 4, 5, 25
PSEL0
PSEL1
Divider
Output
PRELIMINARY
V
V
nQ0
V
CCO
V
V
CCA
Q0
LF
CC
EE
EE
ICS813253
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
OE
V
nQ2
Q2
nQ1
Q1
FSEL0
V
FSEL1
nBypass
CLK
nCLK
CCO
EE
Q0
nQ0
Q1
nQ1
Q2
nQ2

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ICS813253BGLFT Summary of contents

Page 1

FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS G D ENERAL ESCRIPTION The ICS813253 is a member of the HiperClockS™ family of high performance clock solutions from HiPerClockS™ IDT. The ICS813253 is a PLL based synchronous clock generator ...

Page 2

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS ABLE IN ESCRIPTIONS ...

Page 3

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS T 3C ABLE UNCTION ABLE ...

Page 4

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS BSOLUTE AXIMUM ATINGS Supply Voltage Inputs, V -0. Outputs Continuous Current 50mA Surge Current 100mA Package Thermal Impedance, JA Storage Temperature, ...

Page 5

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS T 4D ABLE IFFERENTIAL HARACTERISTICS ...

Page 6

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS T 5B ABLE HARACTERISTICS ...

Page 7

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS T YPICAL RMS Phase Jitter (Random) 1.875MHz to 20MHz = 0.37ps (typical) T YPICAL RMS Phase Jitter (Random) 1.875MHz to 20MHz = 0.35ps (typical) IDT ™ / ICS ™ JITTER ATTENUATOR/FREQUENCY ...

Page 8

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS P ARAMETER CC, V CCO V CCA LVPECL V EE -1.3V ± 0.165V 3. UTPUT OAD EST IRCUIT V CC nCLK V Cross ...

Page 9

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS nFOUTx FOUTx nFOUTy FOUTy t sk( UTPUT KEW 80% Clock 20% Outputs UTPUT ISE ALL IME IDT ™ / ICS ™ JITTER ATTENUATOR/FREQUENCY ...

Page 10

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS OWER UPPLY ILTERING ECHNIQUES As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS813253 provides separate power supplies to ...

Page 11

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS ECOMMENDATIONS FOR NUSED I : NPUTS RYSTAL NPUT For applications not requiring the use of the crystal oscillator input, both XTAL_IN and XTAL_OUT can be ...

Page 12

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS T 2.5V LVPECL O ERMINATION FOR Figure 4A and Figure 4B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminating 2V. For ...

Page 13

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS D PLL S ESCRIPTION OF THE TAGES The ICS813253 is a two stage device, a VCXO PLL followed by a low phase noise FemtoClock frequency multiplier. The VCXO uses an external ...

Page 14

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS OTES ON ETTING THE ALUE OF As another general rule, the following relationship should be maintained between components C and ...

Page 15

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS VCXO C S RYSTAL ELECTION Choosing a crystal with the correct characteristics is one of the most critical steps in using a Voltage Controlled Crystal Oscillator (VCXO). The crystal parameters affect ...

Page 16

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS F ORMULAS ( · V_LOW LOW ( V_LOW ...

Page 17

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS This section provides information on power dissipation and junction temperature for the ICS813253. Equations and example calculations are also provided. 1. Power Dissipation. The total power dissipation for the ICS813253 is ...

Page 18

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS 3. Calculations and Equations. The purpose of this section is to derive the power dissipated into the load. LVPECL output driver circuit and termination are shown in Figure ...

Page 19

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS ABLE VS IR LOW ABLE FOR JA Multi-Layer PCB, JEDEC Standard Test Boards T C RANSISTOR OUNT The transistor count for ICS813253 is: ...

Page 20

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS ACKAGE UTLINE UFFIX FOR IDT ™ / ICS ™ JITTER ATTENUATOR/FREQUENCY TRANSLATOR TSSOP EAD ABLE ACKAGE IMENSIONS ...

Page 21

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS ABLE RDERING NFORMATION ...

Page 22

ICS813253 FEMTOCLOCK™ JITTER ATTENUATOR & FREQUENCY TRANSLATOR W/LVPECL OUTPUTS Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 Corporate Headquarters Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 ...

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