874005AG-04LF Integrated Device Technology (Idt), 874005AG-04LF Datasheet

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874005AG-04LF

Manufacturer Part Number
874005AG-04LF
Description
PCI Express Jitter Attenuator 24-Pin TSSOP Tube
Manufacturer
Integrated Device Technology (Idt)
Datasheet

Specifications of 874005AG-04LF

Package
24TSSOP
Operating Temperature
0 to 70 °C
PCI EXPRESS™ JITTER ATTENUATOR
BW_SEL
IDT
B
G
bandwidth, high phase noise PLL frequency synthesizer. In
these systems, a jitter attenuator may be required to attenuate
high frequency random and deterministic jitter components from
the PLL synthesizer and from the system board. The
ICS874005-04 has 2 PLL bandwidth modes: 300kHz and
2MHz. The 300kHz mode will provide maximum jitter
attenuation, but higher PLL tracking skew and spread spectrum
modulation from the motherboard synthesizer may be
attenuated. The 2MHz bandwidth provides the best tracking
skew and will pass most spread profiles. The ICS874005-04
supports Serdes reference clock frequencies of 100MHz,
125MHz and 250MHz.
The ICS874005-04 uses IDT’s 3
PLL technology to achive the lowest possible phase noise.
The device is packaged in a 24 Lead TSSOP package, making
it ideal for use in space constrained applications such as PCI
Express add-in cards.
F_SELB
F_SELA
HiPerClockS™
IC S
nCLK
LOCK
OEA
OEB Pullup
ENERAL
CLK
MR
/ ICS
0 = ~300kHz
1 = ~2MHz
Pullup
Pulldown
Pulldown
Pulldown
Pulldown
Pullup
Pulldown
PCI EXPRESS™ JITTER ATTENUATOR
D
The ICS874005-04 is a high performance Diff-
erential-to-LVDS Jitter Attenuator designed for use
in PCI Express systems. In some PCI Express
systems, such as those found in desktop PCs, the
PCI Express clocks are generated from a low
IAGRAM
D
ESCRIPTION
Detector
Phase
M = ÷5
(fixed)
rd
490 - 640MHz
Generation FemtoClock
VCO
F_SELB
0
1
F_SELA
0
1
÷2
÷4
÷5
÷4
(default)
(default)
TM
1
F
• PCI Express (2.5 Gb/S) and Gen 2 (5 Gb/s) jitter compliant
PLL B
BW_SEL
0 = PLL Bandwidth: ~300kHz (default)
1 = PLL Bandwidth: ~2MHz
Five differential LVDS output pairs
One differential clock input
Supports 100MHz, 125MHz, and 250MHz Serdes reference
clocks
CLK and nCLK supports the following input types:
LVPECL, LVDS, LVHSTL, SSTL, HCSL
Output frequency range: 98MHz - 320MHz
Input frequency range: 98MHz - 128MHz
RMS phase jitter @ 100MHz (1.875MHz – 20MHz):
0.88ps (typical)
VCO range: 490MHz - 640MHz
Cycle-to-cycle jitter: 35ps (maximum) QA = QB = ÷4
3.3V operating supply
Two bandwidth modes allow the system designer to make
jitter attenuation/tracking skew design trade-offs
0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) package
EATURES
QA0
nQA0
QA1
nQA1
QB0
nQB0
QB1
nQB1
QB2
nQB2
ANDWIDTH
4.40mm x 7.8mm x 0.925mm package body
ICS874005AG-04 REV. A JULY 29, 2008
P
BW_SEL
F_SELA
IN
nQB2
nQA1
nQA0
V
OEA
QA1
QA0
V
ICS874005-04
V
MR
DDO
24-Lead TSSOP
DDA
DD
A
G Package
SSIGNMENT
Top View
1
2
3
4
5
6
7
8
9
10
11
12
ICS874005-04
24
23
22
21
20
19
18
17
16
15
14
13
QB2
V
QB1
nQB1
QB0
nQB0
F_SELB
OEB
GND
GND
nCLK
CLK
DDO

Related parts for 874005AG-04LF

874005AG-04LF Summary of contents

Page 1

... ICS874005- SSIGNMENT 1 nQB2 24 QB2 2 23 nQA1 V DDO QA1 3 22 QB1 V 4 nQB1 21 DDO 5 20 QA0 QB0 6 19 nQA0 nQB0 F_SELB 8 BW_SEL 17 OEB GND DDA 10 15 F_SELA GND nCLK OEA CLK ICS874005-04 24-Lead TSSOP G Package Top View ICS874005AG-04 REV. A JULY 29, 2008 ...

Page 2

... ICS874005-04 PCI EXPRESS™ JITTER ATTENUATOR ABLE IN ESCRIPTIONS ABLE IN HARACTERISTICS IDT ™ / ICS ™ PCI EXPRESS™ JITTER ATTENUATOR ICS874005AG-04 REV. A JULY 29, 2008 ...

Page 3

... DDO those listed in the DC Characteristics or AC Characteristics is not 82.3°C/W (0 mps) implied. Exposure to absolute maximum rating conditions for ex- tended periods may affect product reliability 3.3V±5 0° DDO 100MH ANDWIDTH ONTROL REF 70° – ICS874005AG-04 REV. A JULY 29, 2008 ...

Page 4

... LVDS DC C ABLE HARACTERISTICS ABLE HARACTERISTICS IDT ™ / ICS ™ PCI EXPRESS™ JITTER ATTENUATOR , 3.3V±5 0° DDO 3.3V±5 0°C 70° DDO 3.3V±5 0°C 70° DDO – ÷ ÷ 70° ICS874005AG-04 REV. A JULY 29, 2008 µ A µ A µ A µ ...

Page 5

... GND D IRCUIT IFFERENTIAL nQx Qx ➤ tcycle n+1 nQy UTPUT nQA0, nQA1 nQB0:nQB2 QA0, QA1 QB0:QB2 O D UTPUT 5 I NFORMATION DD V Cross Points NPUT EVEL tsk(o) KEW PERIOD t PW odc = x 100% t PERIOD UTY YCLE ULSE IDTH ERIOD ICS874005AG-04 REV. A JULY 29, 2008 V CMR ...

Page 6

... QA0, QA1 20% QB0:QB2 UTPUT ISE ALL IME IDT ™ / ICS ™ PCI EXPRESS™ JITTER ATTENUATOR M I EASUREMENT NFORMATION V DD out ➤ LVDS DC Input 100 ➤ out O V FFSET OLTAGE 80 20 CONTINUED out out ➤ S ETUP ICS874005AG-04 REV. A JULY 29, 2008 ➤ ...

Page 7

... V and R2/R1 = 0.609. VDD R1 1K Single Ended Clock Input V_REF C1 0. INGLE NDED IGNAL RIVING DDA . IGURE OWER UPPLY ILTERING : UTPUTS across. If they are left floating 3.3V, V_REF should be 1.25V DD CLK nCLK D I IFFERENTIAL NPUT ICS874005AG-04 REV. A JULY 29, 2008 ...

Page 8

... RIVEN BY A RIVER Ohm LVDS_Driv er R1 100 Ohm 3D CLK/nCLK LOCK NPUT D 3.3V LVDS D RIVEN BY A RIVER 2. 120 120 CLK nCLK R1 R2 120 120 3F CLK/nCLK LOCK NPUT D 2.5V SSTL D RIVEN BY A RIVER ICS874005AG-04 REV. A JULY 29, 2008 3.3V CLK nCLK Receiv er 3.3V HiPerClockS ...

Page 9

... F_SELB MR F_SELB 8 17 OEB BW_SEL OEB 9 16 VDDA GND 10 15 F_SELA GND 11 14 VDD nCLK 12 13 OEA CLK 874005_tssop24 ICS874005-04 nCLK CLK ICS874005-04 S IGURE CHEMATIC 9 3. ERMINATION Ohm R2 100 Ohm Ohm R3 100 Ohm E XAMPLE ICS874005AG-04 REV. A JULY 29, 2008 + - + - ...

Page 10

... 3.465V * (80mA + 10mA) = 311.85mW DDA_MAX = 3.465V * 75mA = 259.875mW DDO_MAX TM * Pd_total + 24-L TSSOP EAD ORCED ONVECTION by Velocity (Meters per Second 82.3°C/W 10 devices is 125°C. must be used. Assuming no air JA 1 2.5 78.0°C/W 75.9°C/W ICS874005AG-04 REV. A JULY 29, 2008 ...

Page 11

... PCI EXPRESS™ JITTER ATTENUATOR R I ELIABILITY NFORMATION 24 L TSSOP EAD by Velocity (Meters per Second 82.3°C UTLINE AND ACKAGE TSSOP T EAD ABLE S Reference Document: JEDEC Publication 95, MO-153 11 1 2.5 78.0°C/W 75.9°C/W D IMENSIONS ACKAGE IMENSIONS ° 0 ° ICS874005AG-04 REV. A JULY 29, 2008 ...

Page 12

... IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. IDT ™ / ICS ™ PCI EXPRESS™ JITTER ATTENUATOR " " " " " " ° & ° ICS874005AG-04 REV. A JULY 29, 2008 ° ° ...

Page 13

ICS874005-04 PCI EXPRESS™ JITTER ATTENUATOR Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales 800-345-7015 (inside USA) +408-284-8200 (outside USA) Fax: 408-284-2775 www.IDT.com/go/contactIDT © 2008 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change ...

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