8523BGLF Integrated Device Technology (Idt), 8523BGLF Datasheet

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8523BGLF

Manufacturer Part Number
8523BGLF
Description
Clock Driver 2-IN HSTL 20-Pin TSSOP Tube
Manufacturer
Integrated Device Technology (Idt)
Datasheet

Specifications of 8523BGLF

Package
20TSSOP
Configuration
1 x 2:1
Input Signal Type
CML|HCSL|HSTL|LVDS|LVPECL|SSTL
Maximum Output Frequency
650 MHz
Operating Supply Voltage
3.3 V
Block Diagram
CLK_SEL
General Description
The ICS8523 is a low skew, high performance 1-to-4
Differential-to-HSTL Fanout Buffer. The ICS8523 has two selectable
clock inputs. The CLK, nCLK pair can accept most standard
differential input levels. The PCLK, nPCLK pair can accept LVPECL,
CML, or SSTL input levels. The clock enable is internally
synchronized to eliminate runt pulses on the outputs during
asynchronous assertion/deassertion of the clock enable pin.
Guaranteed output and part-to-part skew characteristics make the
ICS8523 ideal for those applications demanding well defined
performance and repeatability.
ICS8523CG REVISION E JANUARY 24, 2011
CLK_EN
nPCLK
PCLK
nCLK
CLK
Pulldown
Pulldown
Pulldown
Pullup
Pullup
Pullup
0
1
Low Skew, 1-to-4, Differential-to-HSTL
Fanout Buffer
D
LE
Q
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
1
Features
Four differential output HSTL compatible outputs
Selectable differential CLK, nCLK or LVPECL clock inputs
CLK, nCLK pair can accept the following differential input levels:
LVPECL, LVDS, HSTL, HCSL, SSTL
PCLK, nPCLK pair can accept the following differential input
levels: LVPECL, CML, SSTL
Maximum output frequency: 650MHz
Translates any single-ended input signal to HSTL levels with
resistor bias on nCLK input
Additive phase jitter, RMS: 0.082ps (typical), 100MHz f
Additive phase jitter, RMS: 0.190ps (typical), 120MHz f
Output skew: 30ps (maximum)
Part-to-part skew: 200ps (maximum)
3.3V core, 1.8V output operating supply
0°C to 70°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Pin Assignment
6.5mm x 4.4mm x 0.925mm package body
CLK_SEL
CLK_EN
nPCLK
PCLK
nCLK
GND
20-Lead TSSOP
CLK
V
nc
DD
nc
G Package
Top View
ICS8523
1
2
3
4
5
6
7
8
9
10
©2011 Integrated Device Technology, Inc.
20
19
18
17
16
15
14
13
12
11
Q0
nQ0
V
Q1
nQ1
Q2
nQ2
Q3
nQ3
DDO
DATA SHEET
ICS8523
OUT
OUT

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8523BGLF Summary of contents

Page 1

Low Skew, 1-to-4, Differential-to-HSTL Fanout Buffer General Description The ICS8523 is a low skew, high performance 1-to-4 Differential-to-HSTL Fanout Buffer. The ICS8523 has two selectable clock inputs. The CLK, nCLK pair can accept most standard differential input levels. The PCLK, ...

Page 2

ICS8523 Data Sheet Table 1. Pin Descriptions Number Name 1 GND Power 2 CLK_EN 3 CLK_SEL 4 CLK 5 nCLK 6 PCLK 7 nPCLK Unused 10 V Power DD 11, 12 nQ3, Q3 Output 13 ...

Page 3

ICS8523 Data Sheet Function Tables Table 3A. Control Input Function Table Inputs CLK_EN CLK_SEL After CLK_EN switches, the clock outputs are disabled or enabled following a rising and falling input clock edge as shown in Figure ...

Page 4

ICS8523 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

ICS8523 Data Sheet Table 4D. LVPECL DC Characteristics, V Symbol Parameter nPCLK I Input High Current IH PCLK nPCLK I Input Low Current IL PCLK V Peak-to-Peak Voltage PP V Common Mode Input Voltage; NOTE 1 CMR NOTE 1: Common ...

Page 6

ICS8523 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 7

ICS8523 Data Sheet Parameter Measurement Information 3.3V±5% 1.8V±0. DDO HSTL GND 0V 3.3V/1.8V Output Load AC Test Circuit nQx Qx nQy Qy tsk(o) Output Skew nCLK, nPCLK CLK, PCLK nQ[0:3] Q[0: Propagation Delay ICS8523CG REVISION ...

Page 8

ICS8523 Data Sheet Parameter Measurement Information, continued nQ[0:3] Q[0: PERIOD t PW odc = t PERIOD Output Duty Cycle/Pulse Width/Period Applications Information Wiring the Differential Input to Accept Single-Ended Levels Figure 2 shows how a differential input ...

Page 9

ICS8523 Data Sheet 3.3V Differential Clock Input Interface The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL and other differential signals. Both differential signals must meet the V and V input requirements. Figures show interface CMR examples ...

Page 10

ICS8523 Data Sheet 3.3V LVPECL Clock Input Interface The PCLK /nPCLK accepts LVPECL, CML, SSTL and other differential signals. Both signals must meet the V requirements. Figures show interface examples for the PCLK/ nPCLK input driven by ...

Page 11

ICS8523 Data Sheet Recommendations for Unused Input and Output Pins Inputs: LVCMOS Control Pins All control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. A 1kΩ resistor can be used. ...

Page 12

ICS8523 Data Sheet Schematic Example Figure 5 shows a schematic example of the ICS8523. In this example, the input is driven by an IDT HSTL driver. The decoupling 3.3V R12 1K 1. Ohm Ohm ...

Page 13

ICS8523 Data Sheet Power Considerations This section provides information on power dissipation and junction temperature for the ICS8523. Equations and example calculations are also provided. 1. Power Dissipation. The total power dissipation for the ICS8523 is the sum of the ...

Page 14

ICS8523 Data Sheet 3. Calculations and Equations. The purpose of this section is to calculate the power dissipation for the HSTL output pair. HSTL output driver circuit and termination are shown in Figure 6. V DDO Q1 Figure 6. HSTL ...

Page 15

ICS8523 Data Sheet Reliability Information Table 7. θ vs. Air Flow Table for a 20 Lead TSSOP JA Linear Feet per Minute Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards Transistor Count The transistor count for ...

Page 16

... 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 17

ICS8523 Data Sheet Revision History Sheet Rev Table Page Description of Change T4D 5 HSTL table - added Characteristics table - t changed Max. from 2.0ns to 1.6ns Updated Figure 1, CLK_EN Timing ...

Page 18

ICS8523 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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