Cypress CY25701 Programmable high-frequency crystal oscillator with spread spectrum (ssxo) Datasheet

CY25701
Programmable High-Frequency Crystal Oscillator
with Spread Spectrum (SSXO)
Features
Benefits
• Crystal Oscillator with Spread Spectrum Clock (SSC)
• Wide operating output (SSCLK) frequency range
• 10–166 MHz
• Programmable spread spectrum with nominal 31.5 kHz
modulation frequency
• Provides wide range of spread percentages for
maximum electromagnetic interference (EMI)
reduction, to meet regulatory agency electromagnetic
compliance (EMC) requirements. Reduces development and manufacturing costs and time-to-market.
• Eliminates the need for external crystal oscillator.
• Center spread: ±0.25% to ±2.0%
• Internal PLL to generate up to 166 MHz output.
• Down spread: –0.5% to –4.0%
• Suitable for most PC, consumer, and networking
applications.
• Integrated phase-locked loop (PLL)
• Application compatibility in standard and low-power
systems.
• Low cycle-to-cycle Jitter
• 3.3V operation
• Output Enable function
• Package available in 4-Lead Plastic JE SMD
• In-house programming of samples and prototype
quantities is available using the CY3672 programming
kit and CY3613 socket adapter. Production quantities
are available through Cypress’s value-added distribution partners or by using third-party programmers
from BP Microsystems, HiLo Systems, and others.
Pin Configuration
Logic Block Diagram
CY25701
4-pin Plastic SMD
RFB
PLL
with
MODULATION
CONTROL
1
OE
2
VSS
VDD 4
C XIN
PROGRAMMABLE
CONFIGURATION
C XOUT
OUTPUT
DIVIDERS
and
MUX
3
SSCLK 3
SSCLK
1
OE
4
2
VDD
VSS
Cypress Semiconductor Corporation
Document #: 38-07684 Rev. *B
•
3901 North First Street
•
San Jose, CA 95134
•
408-943-2600
Revised October 15, 2004
CY25701
Pin Definition
Pin
Name
Description
1
OE
Output Enable pin: Active HIGH. If OE = 1, SSCLK is enabled.
2
VSS
Power supply ground.
3
SSCLK
Spread spectrum clock output.
4
VDD
3.3V power supply.
Functional Description
The CY25701 uses a programmable configuration memory
array to synthesize output frequency and spread%.
The CY25701 is a Spread Spectrum Crystal Oscillator (SSXO)
IC used for the purpose of reducing EMI found in today’s
high-speed digital electronic systems.
The spread% is programmed to either center spread or down
spread with various spread percentages. The range for center
spread is from ±0.25% to ±2.00%. The range for down spread
is from –0.5% to –4.0%. Contact the factory for smaller or
larger spread% amounts if required. Refer to Table 2 for
spread selection values.
The device uses a Cypress proprietary PLL and Spread
Spectrum Clock (SSC) technology to synthesize and modulate
the frequency of the embedded input crystal. By frequency
modulating the clock, the measured EMI at the fundamental
and harmonic frequencies are greatly reduced. This reduction
in radiated energy can significantly reduce the cost of
complying with regulatory agency (EMC) requirements and
improve time-to-market without degrading system performance.
The frequency modulated SSCLK output can be programmed
from 10–166 MHz.
The CY25701 is available in a 4-pin plastic SMD package with
operating temperature range of –20 to 70°C.
Table 1. Programming Data Requirement
Pin Function
Output Frequency
Spread Percent Code
Frequency Modulation
Pin Name
SSCLK
SSCLK
SSCLK
Pin#
3
3
3
Units
MHz
%
kHz
Program Value
ENTER DATA
ENTER DATA
31.5
Table 2. Spread Percent Selection
Center Spread
Down Spread
Code
A
B
C
D
E
F
Percentage
±0.25%
±0.5%
±0.75%
±1.0%
±1.5%
±2.0%
Code
G
H
J
K
L
M
Percentage
–0.5%
–1.0%
–1.5%
–2.0%
–3.0%
–4.0%
Programming Description
Output Frequency, SSCLK Output (SSCLK, pin 3)
Field/Factory-Programmable CY25701
The modulated frequency at the SSCLK output is produced by
synthesizing the embedded crystal oscillator frequency input.
The range of synthesized clock is from 10–166 MHz.
Field/Factory programming is available for samples and
manufacturing by Cypress and its distributors. All requests
must be submitted to the local Cypress Field Application
Engineer (FAE) or sales representative. Once the request has
been processed, you will receive a new part number, samples,
and data sheet with the programmed values. This part number
will be used for additional sample requests and production
orders.
Additional information on the CY25701 can be obtained from
the Cypress web site at www.cypress.com.
Document #: 38-07684 Rev. *B
Spread Percentage (SSCLK, pin 3)
The SSCLK spread can be programmed to various spread
percentage values from ±0.25% to ±2.0% for Center Spread
and from –0.5% to –4.0% for Down Spread. Refer to Table 2
for available spread options
Frequency Modulation (SSCLK, pin 3)
The frequency modulation is programmed at 31.5 kHz for all
SSCLK frequencies from 10 to 166 MHz. Contact the factory
if a higher-modulation frequency is required.
Page 2 of 7
CY25701
Absolute Maximum Rating
Storage Temperature (Non-condensing) .... –55°C to +100°C
Supply Voltage (VDD) .................................... –0.5V to +7.0V
DC Input Voltage....................................–0.5V to VDD + 0.5V
Junction Temperature ................................ –40°C to +125°C
Data Retention @ Tj = 125°C................................> 10 years
Package Power Dissipation...................................... 350 mW
Operating Conditions
Parameter
Description
Min.
Typ.
Max.
Unit
VDD
Supply Voltage
3.00
3.30
3.60
V
TA
Ambient Temperature
–20
–
70
°C
CLOAD
Max. Load Capacitance @ pin 3
–
–
15
pF
FSSCLK
SSCLK output frequency, CLOAD = 15 pF
10
–
166
MHz
FMOD
Spread Spectrum Modulation Frequency
30.0
31.5
33.0
kHz
TPU
Power-up time for VDD to reach minimum specified
voltage (power ramp must be monotonic)
0.05
–
500
ms
DC Electrical Characteristics
Parameter
Description
Condition
IOH
Output High Current (pin 3)
VOH = VDD – 0.5, VDD = 3.3V (source)
IOL
Output Low Current (pin 3)
VOL = 0.5, VDD= 3.3V (sink)
VIH
Input High Voltage (pin 1)
CMOS levels, 70% of VDD
VIL
Input Low Voltage (pin 1)
CMOS levels, 30% of VDD
IIH
Input High Current (pin 1)
Vin = VDD
IIL
Input Low Current (pin 1)
Vin = VSS
IOZ
Output Leakage Current (pin 3) Three-state output, OE = 0
CIN
[1]
IVDD
Min.
Typ.
Max.
Unit
10
12
–
mA
10
12
–
mA
0.7VDD
–
VDD
V
–
–
0.3VDD
V
–
–
10
µA
–
–
10
µA
–10
–
10
µA
Input Capacitance (pin 1)
Pin 1, or OE
–
5
7
pF
Supply Current
VDD = 3.3V, SSCLK = 10 to 166 MHz,
CLOAD = 0, OE = VDD
–
–
30
mA
AC Electrical Characteristics[1]
Parameter
Description
Condition
Min.
Typ.
Max.
Unit
DC
Output Duty Cycle
SSCLK, Measured at VDD/2
45
50
55
%
tR
Output Rise Time
20%–80% of VDD, CL = 15pF
–
–
2.7
ns
tF
Output Fall Time
20%–80% of VDD, CL = 15pF
–
–
2.7
ns
TCCJ1[2]
Cycle-to-Cycle Jitter
SSCLK (Pin 3)
SSCLK ≥133 MHz, Measured at VDD/2
–
–
200
ps
25 MHz ≤ SSCLK <133 MHz, Measured at VDD/2
–
–
400
ps
SSCLK < 25 MHz, Measured at VDD/2
–
–
1% of 1/SSCK
s
TOE1
Output Disable Time
(pin1 = OE)
Time from falling edge on OE to stopped outputs
(Asynchronous)
–
150
350
ns
TOE2
Output Enable Time
(pin1 = OE)
Time from rising edge on OE to outputs at a valid
frequency (Asynchronous)
–
150
350
ns
TLOCK
PLL Lock Time
Time for SSCLK to reach valid frequency
–
–
10
ms
∆f
Aging in Frequency
TA = 25°C, First year
–5
–
5
ppm
Notes:
1. Guaranteed by characterization, not 100% tested.
2. Jitter is configuration dependent. Actual jitter is dependent on output frequencies, spread percentage, temperature, and output load. For more information, refer
to the application note, “Jitter in PLL Based Systems: Causes, Effects, and Solutions” available at http://www.cypress.com/clock/appnotes.html, or contact your
local Cypress Field Application Engineer.
Document #: 38-07684 Rev. *B
Page 3 of 7
CY25701
Application Circuit
Power
1 OE
VDD
VDD
4
0.1uF
CY25701
2 VSS
SSCLK 3
Switching Waveforms
Duty Cycle Timing (DC = t1A/t1B)
t1A
SSCLK
t1B
Output Rise/Fall Time
VDD
SSCLK
0V
Tr
Tf
Output Rise time (Tr) = (0.6 x VDD)/SR1 (or SR3)
Output Fall time (Tf) = (0.6 x VDD)/SR2 (or SR4)
Refer to AC Electrical Characteristics table for SR (Slew Rate) values.
Output Enable/Disable Timing
OUTPUT
ENABLE
VDD
0V
VIH
VIL
TOE2
High Impedance
SSCLK
(Asynchronous)
TOE1
Document #: 38-07684 Rev. *B
Page 4 of 7
CY25701
Informational Graphs [3]
172.5
161.5
169.5
169
168.5
168
167.5
167
166.5
166
165.5
165
164.5
164
163.5
163
160.5
162.5
171.5
Spread Spectrum Profile: Fnom=166MHz,
Fmod=30kHz, Spread%= -4%
170.5
169.5
168.5
167.5
166.5
Fnominal
165.5
164.5
163.5
162.5
159.5
0
20
68.5
40
60
80
100
120
Time (us)
140
160
180
Fnominal
0
200
Spread Spectrum Profile: Fnom=66MHz,
Fmod=30kHz, Spread%= -4%
68
Spread Spectrum Profile: Fnom=166MHz,
Fmod=30kHz, Spread%= +/-1%
20
67.5
40
60
80
100 120
Time (us)
140
160
180
200
Spread Spectrum Profile: Fnom=66MHz,
Fmod=30kHz, Spread%= +/-1%
67
67.5
67
66.5
66.5
Fnominal
66
Fnominal
66
65.5
65.5
65
64.5
65
64
64.5
63.5
0
20
40
60
80
100
120
Time (us)
140
160
180
200
0
20
40
60
80
100 120
Time (us)
140
160
180
200
Ordering Information
Part Number[4,5]
Package description
Product Flow
CY25701JXCZZZZ
4-Lead Plastic JE SMD – Lead-free
Commercial, –20° to 70°C
CY25701JXCZZZZT
4-Lead Plastic JE SMD, Tape and Reel – Lead-free
Commercial, –20° to 70°C
CY25701FJXC
4-Lead Plastic JE SMD – Lead-free
Commercial, –20° to 70°C
CY25701FJXCT
4-Lead Plastic JE SMD, Tape and Reel – Lead-free
Commercial, –20° to 70°C
Notes:
3. The “Informational Graphs” are meant to convey the typical performance levels. No performance specifications is implied or guaranteed. Refer to the tables on
pages 4 and 5 for device specifications.
4. “ZZZZ” denotes the assigned product dash number. This number will be assigned by factory after the output frequency and spread percent programming data
is received from the customer.
5. “FJXC” suffix is used for products programmed in field by Cypress distributors.
Document #: 38-07684 Rev. *B
Page 5 of 7
CY25701
Package Drawing and Dimension
4-Lead JE04A
10.2±0.3
(10.5 MAX)
4
1.0±0.2
(1.0)
3.6
5.0
5.6±0.2
(5.8 MAX)
1.0±0.2
(1.0)
1
1.3
2.1
2.4
+0.2
-0.1
2.5
(2.7 MAX)
4.6
0.1
0.15±0.1
(0.05 MIN)
0.51
5.08±0.1
DIMENSIONS IN MILLIMETERS
REFERENCE JEDEC: N/A
PKG. WEIGHT: 0.24 gms
5.08
RECOMMENDED SOLDERING PATTERN
51-85204-**
All product and company names mentioned in this document are the trademarks of their respective holders.
Document #: 38-07684 Rev. *B
Page 6 of 7
© Cypress Semiconductor Corporation, 2004. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be
used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
CY25701
Document History Page
Document Title: CY25701 Programmable High-Frequency Crystal Oscillator with Spread Spectrum (SSXO)
Document Number: 38-07684
REV.
ECN NO.
Issue Date
Orig. of
Change
Description of Change
**
224108
See ECN
RGL
New data sheet
*A
258974
See ECN
RGL
Corrected the product suffix (lead-free) in the ordering information table
Added note 4
*B
279379
See ECN
RGL
Added ordering part numbers
Document #: 38-07684 Rev. *B
Page 7 of 7
Similar pages