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SL2305ZC-1T Fiches technique(PDF) 3 Page - SpectraLinear Inc

No de pièce SL2305ZC-1T
Description  Low Jitter and Skew 10 to 140 MHz Zero Delay Buffer (ZDB)
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Fabricant  SPECTRALINEAR [SpectraLinear Inc]
Site Internet  http://www.spectralinear.com
Logo SPECTRALINEAR - SpectraLinear Inc

SL2305ZC-1T Fiches technique(HTML) 3 Page - SpectraLinear Inc

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Rev 1.4, May 25, 2007
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SL2305
General Description
The SL2305 is a low skew, low jitter Zero Delay Buffer with
very low operating current.
The product includes an on-chip high performance PLL that
locks into the input reference clock and produces nine (9)
output clock drivers tracking the input reference clock for
systems requiring clock distribution.
In addition to CLKOUT that is used for internal PLL
feedback, there is a single bank with four (4) outputs,
bringing the number of total available output clocks to five
(5).
Input and output Frequency Range
The input and output frequency range is the same. But, the
frequency range depends on the drive levels and load
capacitance (CL) as given in the below Table 1.
Drive
CL(pF)
Min(MHz)
Max(MHz)
HIGH
15
10
140
HIGH
30
10
100
STD
15
10
100
STD
30
10
66
Table 1. Input/Output Frequency Range
If the input clock frequency is DC (0 to VDD), this is
detected by an input detection circuitry and all nine (5) clock
outputs are forced to Hi-Z. The PLL is shutdown to save
power. In this shutdown state, the product draws less than
12 A-max supply current.
SpreadThru
Feature
If a Spread Spectrum Clock (SSC) were to be used as an
input clock, the SL2305 is designed to pass the modulated
Spread Spectrum Clock (SSC) signal from its CLKIN
(reference) input to the output clocks. The same spread
characteristics at the input are passed through the PLL and
drivers without any degradation in spread percent (%),
spread profile and modulation frequency.
High and Low-Drive Product Options
The SL2305 is offered with High-Drive “-1H” and Standard-
Drive “-1” options. These drive options enable the users to
control load levels, frequency range and EMI control. Refer
to the AC electrical tables for the details.
Skew and Zero Delay
All outputs should drive the similar load to achieve output-
to-output and input-to-output skew specifications given in
the AC electrical tables.
However, Zero delay between input and outputs can be
adjusted by changing the loading of CLKOUT relative to the
clock outputs since CLKOUT is the feedback to the PLL.
Power Supply Range (VDD)
The SL2305 is designed to operate from 3.0V (Min) to 3.6V
(Max), complying with VDD=3.3V+/-10% requirement.
An internal on-chip voltage regulator is used to supply PLL
constant power supply of 1.8V, leading to a consistent and
stable PLL electrical performance in terms of skew, jitter
and power dissipation.
Refer to SL23EP05 for 2.5V and SL23EPL05 for 1.8V
power supply operation requirements.
Temperature Range and Packages
The
SL2305
is
offered
with
extended
commercial
temperature range of 0 to +70°C (C-Grade) and industrial
temperature range of -40 to +85°C (I-Grade).
The SL2305 is available in 8-pin SOIC (150-mil) and
TSSOP (173-mil) packages.


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