ICS844202AK-245LFT IDT, Integrated Device Technology Inc, ICS844202AK-245LFT Datasheet

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ICS844202AK-245LFT

Manufacturer Part Number
ICS844202AK-245LFT
Description
IC CLOCK GEN SRL SCSI 32-VFQFPN
Manufacturer
IDT, Integrated Device Technology Inc
Series
HiPerClockS™r
Type
Clock/Frequency Synthesizerr
Datasheet

Specifications of ICS844202AK-245LFT

Input
LVCMOS, LVTTL
Output
LVDS
Frequency - Max
250MHz
Voltage - Supply
3.135 V ~ 3.465 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
32-VFQFN
Frequency-max
250MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
844202AK-245LFT
CRYSTAL-TO-LVDS PCI EXPRESS™
CLOCK SYNTHESIZER W/SPREAD SPECTRUM
G
Spread type and amount can be configured via the SSC control
pins. Using a 25MHz, 18pF parallel resonant crystal, the device
will generate LVDS clocks at either 25MHz, 100MHz, 125MHz or
250MHz. The ICS844202-245 uses a low jitter VCO that easily
meets PCI Express jitter requirements and is packaged in a
32-pin VFQFN package.
B
XTAL_OUT
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
HiPerClockS™
FSEL[1:0]
IC S
SSC[1:0]
XTAL_IN
LOCK
ENERAL
/ ICS
OE
Pullup
Pullup:Pullup
Default = 100MHz
Pulldown:Pullup
LVDS PCI EXPRESS™ CLOCK SYNTHESIZER
25MHz
D
The ICS844202-245 is a 2 output PCI Express™ clock
synthesizer optimized to generate low jitter PCIe
reference clocks with or without spread spectrum
modulation and is a member of the HiPerClockS™
family of high performance clock solutions from IDT.
IAGRAM
D
OSC
ESCRIPTION
2
2
Detector
Phase
Feedback Divider
Spread Spectrum
Control
÷20
240-700MHz
VCO
0 0
0 1
1 0
1 1
PLL Bypass
÷5
÷4
÷2
1
P
F
• Two LVDS outputs at 25MHz, 100MHz, 125MHz or 250MHz
• Crystal oscillator interface, 25MHz, 18pF parallel resonant
• Supports the following output frequencies:
• VCO range: 240MHz - 700MHz
• Supports SSC downspread at 0.50% and -0.75%,
• Cycle-to-cycle jitter: 70ps (typical)
• Period jitter: 40ps (typical)
• Full 3.3V power supply mode
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
crystal
25MHz, 100MHz, 125MHz or 250MHz
centerspread at ±0.25% and no spread options
packages
IN
EATURES
A
SSIGNMENT
Q0
nQ0
Q1
nQ1
FSEL0
V
V
V
DDO
nc
nc
nc
nc
DD
DD
ICS844202BK-245 REV. A JULY 9, 2007
1
2
3
4
5
6
7
8
32 31 30 29 28 27 26 25
5mm x 5mm x 0.75mm
9 10 11 12 13 14 15 16
ICS844202-245
32-Lead VFQFN
ICS844202-245
package body
K Package
Top View
PRELIMINARY
24
23
22
21
20
19
18
17
nc
nc
GND
nc
nc
SSC1
nc
GND

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ICS844202AK-245LFT Summary of contents

Page 1

CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM G D ENERAL ESCRIPTION The ICS844202-245 output PCI Express™ clock IC S synthesizer optimized to generate low jitter PCIe HiPerClockS™ reference clocks with or without spread spectrum modulation and is ...

Page 2

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM ABLE IN ESCRIPTIONS Number Name Type , ...

Page 3

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM BSOLUTE AXIMUM ATINGS Supply Voltage Inputs, V -0. Outputs Continuous Current 10mA Surge Current 15mA Package Thermal Impedance, JA Storage Temperature, T ...

Page 4

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM ABLE RYSTAL HARACTERISTICS ...

Page 5

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM P ARAMETER 3.3V±10 DDO POWER SUPPLY DDA LVDS + Float GND – 3.3V LVDS UTPUT OAD EST nQx Qx nQy Qy tsk(o) ...

Page 6

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM OWER UPPLY ILTERING ECHNIQUES As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS844204-245 provides separate power supplies to isolate ...

Page 7

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM LVCMOS XTAL I TO NTERFACE The XTAL_IN input can accept a single-ended LVCMOS signal through an AC couple capacitor. A general interface diagram is shown in Figure 3. The XTAL_OUT pin can ...

Page 8

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM 3.3V LVDS D T RIVER ERMINATION A general LVDS interface is shown in Figure 100 differential transmission line environment, LVDS drivers require a matched load termination of 100 3.3V ...

Page 9

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM This section provides information on power dissipation and junction temperature for the ICS844202-245. Equations and example calculations are also provided. 1. Power Dissipation. The total power dissipation for the ICS844202-245 is the ...

Page 10

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM ABLE VS IR LOW ABLE FOR JA Multi-Layer PCB, JEDEC Standard Test Boards T C RANSISTOR OUNT The transistor count for ICS844202-245 is: 4715 IDT ™ ...

Page 11

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM ACKAGE UTLINE UFFIX FOR T ABLE S Y Reference Document: JEDEC Publication 95, MO-220 IDT ™ / ICS ™ LVDS PCI EXPRESS™ CLOCK SYNTHESIZER VFQFN ...

Page 12

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM ABLE RDERING NFORMATION ...

Page 13

ICS844202-245 CRYSTAL-TO-LVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM 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 United ...

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