CY26049-3 Cypress Semiconductor Corp., CY26049-3 Datasheet

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CY26049-3

Manufacturer Part Number
CY26049-3
Description
Telecom Equipment Clock
Manufacturer
Cypress Semiconductor Corp.
Datasheet
Cypress Semiconductor Corporation
Document #: 38-07483 Rev. **
Logic Block Diagram
• Fully integrated phase locked loop (PLL)
• FailSafe™ output
• PLL driven by a crystal oscillator
• 4.096-MHz output from 19.44-MHz input
• Low-jitter, high-accuracy outputs
• 3.3V ± 5% operation
• 16-lead TSSOP
input reference clock
(19.44 MH z)
IC L K
Features
F AILSAF E
IC L K detected
S AF E
C O N T RO L
TM
3901 North First Street
e xternal pullable crystal
ADVANCE
INFORMATION
XIN
C O N T RO LLED
O SC ILLAT O R
(19.44 MH z)
C R YST AL
D IG IT AL
Communications Clock Generator
X OU T
• Integrated high-performance PLL tailored for telecom-
• DCXO maintains continuous operation should the input
• Zero-ppm error for all output frequencies
• When reference is off, DCXO maintains clock outputs
• Glitch-free transition simplifies system design
• FailSafe DCXO loop bandwidth approximately 100 Hz
• Works with commonly available, low-cost 19.44-MHz
• Compatibility across industry standard 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
LO C KED
PH A SE
LO O P
San Jose
O U T PUT
D IV ID ER
Benefits
CA 95134
Revised October 31, 2002
C L K A
4.096 M H z
FailSafe™
CY26049-3
408-943-2600

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CY26049-3 Summary of contents

Page 1

... KED LLED YST ILLAT O R • 3901 North First Street • San Jose CY26049-3 FailSafe™ Benefits 4.096 PUT • 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 CY26049-3 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 CY26049-3, is reported by the SAFE pin ...

Page 3

... C Shunt Capacitance O C Stray Capacitance—on XIN/XOUT LBRD All applicable DC and AC characteristics are as described in the CY26049-36 data sheet. Ordering Information Ordering Code CY26049ZC-3 CY26049ZC-3T Package Drawing and Dimensions 16-lead Thin Shrunk Small Outline Package (4.40 MM Body) Z16 FailSafe is a trademark of Cypress Semiconductor Corporation. All product and company names mentioned in this document are the trademarks of their respective holders ...

Page 4

... Document History Page Document Title: CY26049-3 FailSafe™ Communications Clock Generator Document Number: 38-07483 Issue REV. ECN NO. Date ** 119589 11/01/02 Document #: 38-07483 Rev. ** ADVANCE INFORMATION Orig. of Change CKN New Data Sheet CY26049-3 Description of Change Page ...

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