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Cypress Semiconductor Electronic Components Datasheet

CY26049-36 Datasheet

Global Communications Clock Generator

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CY26049-36
FailSafe™ PacketClock
Global Communications Clock Generator
FailSafe™ PacketClock Global Communications Clock Generator
Features
Fully Integrated Phase-Locked Loop (PLL)
FailSafeOutput
8 kHz Reference Clock
PLL Driven by a Crystal Oscillator that is Phase Aligned with
External Reference
Selectable Standard Communication Output Frequencies
Low Jitter, High Accuracy Outputs
3.3 V Operation
16-pin TSSOP Package
Commercial and Industrial Temperature Ranges
Functional Description
CY26049 is a FailSafe frequency synthesizer with a reference
clock input and three clock outputs. The device provides an
optimum solution for applications which require continuous
operation in case of primary clock failure. The continuous,
glitch-free operation is achieved by using a DCXO which serves
as a primary clock source. The FailSafe control circuit
synchronizes the DCXO with the reference as long as the
reference is within the pull range of the crystal.
In the event of a reference clock failure the DCXO maintains the
last frequency and phase information of the reference clock. The
unique feature of the CY26049-36 is that the DCXO is, in fact,
the primary clocking source. When the reference clock is
restored, the DCXO automatically resynchronizes to the
reference. The status of the reference clock input, as detected
by the CY26049-36, is reported by the SAFE pin.
In the buffer mode (FS3:FS0 = 1110 or 1111), the CY26049-36
can be used as a jitter attenuator. In this mode, extensive jitter
on the input clock is ‘filtered’, resulting in a low jitter output clock.
For a complete list of related documentation, click here.
Logic Block Diagram
Input reference
(typical 8 kHz)
ICLK
external pullable crystal
(18.432 MHz)
XIN XOUT
FAILSAFETM
CONTROL
DIGITAL
CONTROLLED
CRYSTAL
OSCILLATOR
PHASE
LOCKED
LOOP
OUTPUT
DIVIDERS
CLK
CLK/2
FS[3:0]
frequency select
SAFE
High=ICLK detected
8K
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 38-07415 Rev. *I
• San Jose, CA 95134-1709 • 408-943-2600
Revised May 23, 2016


Cypress Semiconductor Electronic Components Datasheet

CY26049-36 Datasheet

Global Communications Clock Generator

No Preview Available !

CY26049-36
Contents
Pin Configuration ............................................................. 3
Pin Definitions .................................................................. 3
Frequency Select Tables ................................................. 4
Absolute Maximum Conditions ....................................... 5
Recommended Pullable Crystal Specifications ............ 5
Recommended Operating Conditions ............................ 5
DC Electrical Specifications ............................................ 6
DC Electrical Specifications ............................................ 6
Thermal Resistance .......................................................... 6
AC Electrical Specifications ............................................ 7
Voltage and Timing Definitions ....................................... 7
Test Circuit ........................................................................ 8
Ordering Information ........................................................ 8
Ordering Code Definitions ........................................... 8
Package Diagram .............................................................. 9
Acronyms ........................................................................ 10
Document Conventions ................................................. 10
Units of Measure ....................................................... 10
Document History Page ................................................. 11
Sales, Solutions, and Legal Information ...................... 12
Worldwide Sales and Design Support ....................... 12
Products .................................................................... 12
PSoC®Solutions ....................................................... 12
Cypress Developer Community ................................. 12
Technical Support ..................................................... 12
Document Number: 38-07415 Rev. *I
Page 2 of 12


Part Number CY26049-36
Description Global Communications Clock Generator
Maker Cypress Semiconductor
Total Page 12 Pages
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