8S89874BKILF IDT [Integrated Device Technology], 8S89874BKILF Datasheet

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8S89874BKILF

Manufacturer Part Number
8S89874BKILF
Description
1:2 Differential-to-LVPECL Buffer/Divider
Manufacturer
IDT [Integrated Device Technology]
Datasheet

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Block Diagram
General Description
The ICS8S89874I is a high speed 1:2 Differential-to- LVPECL Buffer/
Divider. The ICS8S89874I has a selectable ÷1, ÷2, ÷4, ÷8, ÷16
output divider, which allows the device to be used as either a 1:2
fanout buffer or frequency divider. The clock input has internal
termination resistors, allowing it to interface with several differential
signal types while minimizing the number of required external
components. The device is packaged in a small, 3mm x 3mm
VFQFN package, making it ideal for use on space-constrained
boards.
nRESET
ICS8S89874BKI REVISION A OCTOBER 22, 2010
V
REF_AC
nIN
S2
S0
S1
V
IN
T
50Ω
50Ω
Pullup
Pullup
Pullup
Pullup
Decoder
Enable
1:2 Differential-to-LVPECL Buffer/Divider
FF
00 ÷2
01 ÷4
10 ÷8
11 ÷16
Enable
MUX
0
1
1
Q0
nQ0
Q1
nQ1
Features
Two LVPECL/ECL output pairs
Frequency divide select options: ÷1 (pass through), ÷2, ÷4, ÷8,
÷16
IN, nIN input can accept the following differential input levels:
LVPECL, LVDS, CML
Output frequency: 2GHz (maximum)
Output skew: 15ps (maximum)
Part-to-part skew: 250ps (maximum)
Additive phase jitter, RMS: 0.20ps (typical)
LVPECL supply voltage range: 2.375V to 3.63V
ECL supply voltage range: -3.63V to -2.375V
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package
Pin Assignment
3mm x 3mm x 0.925mm package body
nQ0
nQ1
Q0
Q1
16-Lead VFQFN
ICS8S89874I
1
2
3
4
16 15 14 13
K Package
5
Top View
©2010 Integrated Device Technology, Inc.
6
7
8
12
11
10
ICS8S89874I
9
V
IN
V
nIN
T
REF_AC
DATA SHEET

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8S89874BKILF Summary of contents

Page 1

Differential-to-LVPECL Buffer/Divider General Description The ICS8S89874I is a high speed 1:2 Differential-to- LVPECL Buffer/ Divider. The ICS8S89874I has a selectable ÷1, ÷2, ÷4, ÷8, ÷16 output divider, which allows the device to be used as either a 1:2 fanout ...

Page 2

ICS8S89874I Data Sheet Table 1. Pin Descriptions Number Name 1, 2 Q0, nQ0 Output 3, 4 Q1, nQ1 Output 5, 15, 16 S2, S1, S0 Input 6 nc Unused Power cc 8 nRESET Input 9 nIN Input ...

Page 3

ICS8S89874I Data Sheet Function Tables Table 3A. Control Input Function Table Inputs nRESET Selected Source 0 IN/nIN 1 IN/nIN nRESET nIN V Swing IN nQx Qx Figure 1. nRESET Timing Diagram Table 3B. Truth Table Inputs nRESET ...

Page 4

ICS8S89874I Data Sheet Absolute Maximum Ratings NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond those ...

Page 5

ICS8S89874I Data Sheet Table 4C. Differential DC Characteristics, V Symbol Parameter R Differential Input Resistance IN V Input High Voltage IH V Input Low Voltage IL V Input Voltage Swing IN V Differential Input Voltage Swing DIFF_IN I Input Current; ...

Page 6

ICS8S89874I Data Sheet AC Electrical Characteristics Table 5. AC Characteristics Symbol Parameter f Output Frequency OUT f Input Frequency IN Propagation Delay; (Differential NOTE 1 tsk(o) Output Skew; NOTE 2, 4 tsk(pp) Part-to-Part Skew; NOTE 3, ...

Page 7

ICS8S89874I Data Sheet Additive Phase Jitter The spectral purity in a band at a specific offset from the fundamental compared to the power of the fundamental is called the dBc Phase Noise. This value is normally expressed using a Phase ...

Page 8

ICS8S89874I Data Sheet Parameter Measurement Information LVPECL V EE -0.375V to -1.63V Output Load AC Test Circuit Par t 1 nQx Qx Par t 2 nQy Qy tsk(pp) Part-to-Part Skew V IN Differential Voltage Swing = 2 ...

Page 9

ICS8S89874I Data Sheet Applications Information 3.3V Differential Input with Built-In 50 The IN /nIN with built-in 50Ω terminations accept LVDS, LVPECL, CML and other differential signals. Both signals must meet the V and V input requirements. Figures ...

Page 10

ICS8S89874I Data Sheet 2.5V LVPECL Input with Built-In 50 The IN /nIN with built-in 50Ω terminations accept LVDS, LVPECL, CML and other differential signals. Both signals must meet the V and V input requirements. Figures show interface ...

Page 11

ICS8S89874I Data Sheet Recommendations for Unused Input and Output Pins Inputs: LVCMOS Control Pins All control pins has internal pullups; additional resistance is not required but can be added for additional protection. A 1kΩ resistor can be used. Termination for ...

Page 12

ICS8S89874I Data Sheet Termination for 2.5V LVPECL Outputs Figure 5A and Figure 5B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminating 50Ω – 2V. For V = 2.5V, the ...

Page 13

ICS8S89874I Data Sheet VFQFN EPAD Thermal Release Path In order to maximize both the removal of heat from the package and the electrical performance, a land pattern must be incorporated on the Printed Circuit Board (PCB) within the footprint of ...

Page 14

ICS8S89874I Data Sheet Power Considerations This section provides information on power dissipation and junction temperature for the ICS8S89874I. Equations and example calculations are also provided. 1. Power Dissipation. The total power dissipation for the ICS8S89874I is the sum of the ...

Page 15

ICS8S89874I Data Sheet 3. Calculations and Equations. The purpose of this section is to calculate the power dissipation for the LVPECL output pairs. LVPECL output driver circuit and termination are shown in Figure Figure 7. LVPECL ...

Page 16

ICS8S89874I Data Sheet Reliability Information Table 7. θ vs. Air Flow Table for a 16 Lead VFQFN JA Meters per Second Multi-Layer PCB, JEDEC Standard Test Boards Transistor Count The transistor count for ICS8S89874I is: 489 Pin compatible with ICS889874 ...

Page 17

ICS8S89874I Data Sheet Package Outline and Package Dimensions Package Outline - K Suffix for 16 Lead VFQFN Seating Plan Index rea N Singulation Singulation Top View D Chamfer 4x 0.6 x 0.6 max OPTIONAL Bottom View w/Type ...

Page 18

... Marking 8S89874BKILF 874B 8S89874BKILFT 874B NOTE: Parts that are ordered with an "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 19

ICS8S89874I Data Sheet We’ve Got Your Timing Solution 6024 Silver Creek Valley Road Sales 800-345-7015 (inside USA) San Jose, California 95138 +408-284-8200 (outside USA) Fax: 408-284-2775 www.IDT.com/go/contactIDT DISCLAIMER Integrated Device Technology, Inc. (IDT) and its subsidiaries reserve the right to ...

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