557G-08LFT IDT, 557G-08LFT Datasheet

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557G-08LFT

Manufacturer Part Number
557G-08LFT
Description
Clock Drivers & Distribution PCI-EXPRESS CLOCK MUX (2
Manufacturer
IDT
Datasheet

Specifications of 557G-08LFT

Rohs
yes
Part # Aliases
ICS557G-08LFT
2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1
Description
The ICS557-08 is a 2:1 multiplexer chip that allows the user
to select one of the two HCSL (Host Clock Signal Level)
input pairs and fans out to one pair of differential HCSL or
LVDS outputs. This chip is suited especially for
PCI-Express applications, where there is a need to select
the PCI-Express clock either locally from the PCI-E card or
from the motherboard.
Block Diagram
IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1
IN1
IN1
IN2
IN2
MUX
2 to 1
SEL
GND
VDD
3
3
PD
1
Features
Packaged in 16-pin TSSOP
Pb (lead) free package
Operating voltage of 3.3 V
Low power consumption
Input clock frequency of up to 200 MHz
For PCIe Gen2/3 applications, see the 5V41068A
OE
Rr (IREF)
CLK
CLK
ICS557-08
DATASHEET
ICS557-08
REV L 112111

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557G-08LFT Summary of contents

Page 1

... PCI-Express applications, where there is a need to select the PCI-Express clock either locally from the PCI-E card or from the motherboard. Block Diagram IN1 IN1 IN2 IN2 IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 Features • Packaged in 16-pin TSSOP • Pb (lead) free package • Operating voltage of 3.3 V • ...

Page 2

... Output 10 VDD Power 11 VDD Power 12 GND Power 13 GND Power 14 CLK Output 15 CLK Output 16 SEL Input IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 Select Table SEL 16 SEL 0 15 CLK 1 14 CLK 13 GND 12 GND 11 VDD 10 VDD 9 IREF Pin Description Connect to +3.3 V. Supply voltage for Input clocks. ...

Page 3

... ICS557-08. This includes signal traces just underneath the device layers adjacent to the ground plane layer used by the device. IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 External Components A minimum number of external components are required for proper operation. Decoupling capacitors of 0.01 μF should be connected between VDD and GND pins as close to the device as possible ...

Page 4

... Other signal traces should be routed away from the ICS557-08.This includes signal traces just underneath the device layers adjacent to the ground plane layer used by the device. IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 6*IREF 4 PCIE MULTIPLEXER ICS557-08 ...

Page 5

... L4 length, Route as coupled microstrip 100 ohm differential trace. L4 length, Route as coupled stripline 100 ohm differential trace. PCI-Express Device Routing ICS557-08 Output Clock Typical PCI-Express (HCSL) Waveform 700 mV 0 500 ps 500 0.525 V 0.175 V IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 L1’ L2’ L3’ L3 ...

Page 6

... R1a = R1b = R1 R2a = R2b = R2 LVDS Device Routing Figure 3 L1 L1' HCSL Output Buffer Typical LVDS Waveform 1325 mV 1000 mV 500 ps 500 1250 mV 1150 mV IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 150 100 33 78.7 137 33 78.7 none 33 174 140 L2 R3 R1a L2' R1b R2a ...

Page 7

... L PIN Output Resistance R OUT Pull-up Resistor R PUP 1. Single edge is monotonic when transitioning through region. 2. Inputs with pull-ups/-downs are not included. IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 Item Conditions V OE, SEL OE, SEL < Vin < VDD IL 50Ω ...

Page 8

... Measured at the crossing point where instantaneous voltages of both CLK and CLK are equal. 5 CLK and CLK pins are tri-stated when OE is Low asserted. CLK and CLK are driven differential when OE is High unless its PD = low. IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 Conditions HCSL termination LVDS termination ...

Page 9

... Bottom marking: (origin). Origin = country of origin if not USA. IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 Symbol Conditions θ Still air JA θ 1 m/s air flow JA θ 3 m/s air flow JA θ JC Marking Diagram PCIE MULTIPLEXER Min. Typ. Max. Units ° C/W 93 ° C/W 78 ° C/W 65 ° C/W 20 (ICS557GI-08LF 557GI08L ###### YYWW 1 8 ICS557-08 REV L 112111 ...

Page 10

... Part / Order Number Marking 557G-08LF see page 9 557G-08LFT 557GI-08LF 557GI-08LFT "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use ...

Page 11

... LPL 08/02/11 L K.B. 11/21/11 IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 Description of Change Added industrial temp range; updated PCI-Express Waveform diagram to include 0.525 V; changed “Supply Voltage, VDD” spec in Absolute Max. Ratings from 5 changed CLKOUT to CLK and CLK ; added marking diagrams for I-temp device ...

Page 12

... Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT, ICS, and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners ...

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