CY26049-1 Cypress Semiconductor Corp., CY26049-1 Datasheet

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CY26049-1

Manufacturer Part Number
CY26049-1
Description
Telecom Equipment Clock
Manufacturer
Cypress Semiconductor Corp.
Datasheet
Cypress Semiconductor Corporation
Document #: 38-07488 Rev. **
Logic Block Diagram
• Fully integrated phase-locked loop (PLL)
• FailSafe™ output
• PLL driven by a crystal oscillator
• Two 6.312-MHz outputs from 8-kHz input
• Low-jitter, high-accuracy outputs
• 3.3 V ± 5% operation
• 16-lead TSSOP
input reference clock
(typical 8 kHz)
ICLK
Features
FAILSAFE
ICLK detected
SAFE
CONTROL
TM
3901 North First Street
external pullable crystal
ADVANCE
INFORMATION
XIN
CONTROLED
OSCILLATOR
(18.432 MHz)
CRYSTAL
DIGITAL
Communications Clock Generator
XOUT
• Integrated high-performance PLL tailored for telecom-
• DCXO maintains continuous operation should the input
• Works with commonly available, low-cost 18.432-MHz
• Zero-ppm error for all output frequencies
• Compatibility across industry standard design
• When reference is off, DCXO maintains clock outputs
• Glitch-free transition simplifies system design
• Industry standard package with 6.4 x 5.0 mm footprint
munications frequency synthesis eliminates the need
for external loop filter components
and SAFE pin indicates FailSafe conditions
reference clock fail
crystal
platforms
and a height profile of just 1.1 mm
LOCKED
PHASE
LOOP
San Jose
DIVIDERS
OUTPUT
Benefits
CA 95134
Revised October 31, 2002
CLKA
6.312 MHz
CLKB
6.312 MHz
FailSafe™
CY26049-1
408-943-2600

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CY26049-1 Summary of contents

Page 1

... MHz) XOUT XIN PHASE TM DIGITAL LOCKED CONTROLED LOOP CRYSTAL OSCILLATOR • 3901 North First Street • San Jose CY26049-1 FailSafe™ Benefits CLKA 6.312 MHz OUTPUT DIVIDERS CLKB 6.312 MHz • CA 95134 • 408-943-2600 Revised October 31, 2002 ...

Page 2

... In the event of a reference clock failure the DCXO maintains the last frequency of the reference clock. The unique feature of the CY26049-1 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 CY26049-1, is reported by the SAFE pin ...

Page 3

... Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. ADVANCE INFORMATION Name Min Package Type 16-lead TSSOP 16-lead TSSOP—Tape and Reel CY26049-1 Typ. Max. Unit 250 70 °C ± ...

Page 4

... Document History Page Document Title: CY26049-1 FailSafe™ Communications Clock Generator Document Number: 38-07488 Issue REV. ECN NO. Date ** 120007 11/01/02 Document #: 38-07488 Rev. ** ADVANCE INFORMATION Orig. of Change CKN New Data Sheet CY26049-1 Description of Change Page ...

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