Clock Generator with VCXO
CY241V08A-12
Cypress Semiconductor Corporation
3901 North First Street
San Jose
,
CA 95134
408-943-2600
Document #: 38-07676 Rev. **
Revised June 02, 2004
Features
Integrated phase-locked loop (PLL)
Low-jitter, high-accuracy outputs
VCXO with analog adjust
3.3V operation
Benefits
Highest-performance PLL tailored for multimedia
applications
Meets critical timing requirements in complex system
designs
Application compatibility for a wide variety of designs
Frequency Table
Part Number
Outputs
Input Frequency Range
Output Frequencies
VCXO Control
Curve
CY241V08A-12
2
27-MHz pullable crystal input per
Cypress specification
One copy of 27 MHz
One copy of 74.25 MHz
linear
27
XIN
XOUT
OSC
VCXO
VDD
VSS
Block Diagram
8-pin SOIC
CY241V08A-12
1
2
3
4
XOUT
XIN
VCXO
XBUF/27 MHz
VSS
NC
74.25 MHz
5
6
7
8
VDD
Pin Configuration
OUTPUT
DIVIDER
PLL
74.25MHz
XBUF/27MHz
CY241V08A-12
Document #: 38-07676 Rev. **
Page 2 of 6
Pin Definitions
Name
Pin Number
Description
XIN
1
Reference crystal input.
VDD
2
Voltage supply.
VCXO
3
Input analog control for VCXO.
VSS
4
Ground.
XBUF/27 MHz 5
27 MHz buffered crystal output.
74.25 MHz
6
74.25 MHz clock output.
NC
7
No Connect.
XOUT
8
Reference crystal output.
CY241V08A-12
Document #: 38-07676 Rev. **
Page 3 of 6
Absolute Maximum Conditions
Supply Voltage (V
DD
) ........................................0.5 to +7.0V
DC Input Voltage...................................... 0.5V to V
DD
+ 0.5
Storage Temperature (Non-condensing).....55
C to +125C
Junction Temperature ................................ 40
C to +125C
Data Retention @ Tj = 125
C................................> 10 years
Package Power Dissipation...................................... 350 mW
ESD (Human Body Model) JESD22-A114-B ............ > 2000V
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Pullable Crystal Specifications
[1]
Parameter
Description
Comments
Min. Typ. Max.
Unit
F
NOM
Nominal crystal frequency
Parallel resonance, fundamental mode, AT
cut
27
MHz
C
LNOM
Nominal load capacitance
14
pF
R
1
Equivalent series resistance (ESR)
Fundamental mode
25
R
3
/R
1
Ratio of third overtone mode ESR to
fundamental mode ESR
Ratio used because typical R
1
values are
much less than the maximum spec
3
DL
Crystal drive level
No external series resistor assumed
150
W
F
3SEPHI
Third overtone separation from 3*F
NOM
High side
300
ppm
F
3SEPLO
Third overtone separation from 3*F
NOM
Low side
150
ppm
C
0
Crystal shunt capacitance
7
pF
C
0
/C
1
Ratio of shunt to motional capacitance
180
250
C
1
Crystal motional capacitance
14.4
18
21.6
fF
Recommended Operating Conditions
Parameter
Description
Min.
Typ.
Max.
Unit
V
DD
Operating Voltage
3.135
3.3
3.465
V
T
A
Ambient Temperature
0
70
C
C
LOAD
Max. Load Capacitance
15
pF
t
PU
Power-up time for all V
DD
pins to reach minimum specified
voltage (power ramps must be monotonic)
0.05
500
ms
DC Electrical Specifications
Parameter
Name
Description
Min.
Typ.
Max.
Unit
I
OH
Output HIGH Current
V
OH
= V
DD
0.5V, V
DD
= 3.3V
12
24
mA
I
OL
Output LOW Current
V
OL
= 0.5V, V
DD
= 3.3V
12
24
mA
C
IN
Input Capacitance
Except XIN, XOUT pins
7
pF
V
VCXO
VCXO Input Range
0
V
DD
V
f
XO
[2]
VCXO Pullability Range
Low Side
115
ppm
High Side
115
ppm
I
VDD
Supply Current
40
mA
AC Electrical Specifications
(V
DD
= 3.3V)
[3]
Parameter
[3]
Name
Description
Min.
Typ.
Max.
Unit
DC
Output Duty Cycle
Duty Cycle is defined in Figure 1, 50% of V
DD
45
50
55
%
ER
Rising Edge Rate
Output Clock Edge Rate, Measured from 20%
to 80% of V
DD
, C
LOAD
= 15 pF. See Figure 2.
0.8
1.4
V/ns
EF
Falling Edge Rate
Output Clock Edge Rate, Measured from 80%
to 20% of V
DD
, C
LOAD
= 15 pF. See Figure 2.
0.8
1.4
V/ns
Notes:
1.
Crystals that meet this specification includes: Ecliptek ECX-5808-27.000M
2.
115/+115 ppm assumes 2.5 pF of additional board level load capacitance. This range will be shifted down with more board capacitance or shifted up with less
board capacitance.
3.
Not 100% tested.
CY241V08A-12
Document #: 38-07676 Rev. **
Page 4 of 6
Voltage and Timing Definitions
t
9
Clock Jitter 74.25 MHz
Peak-to-peak period jitter
150
ps
t
9
Clock Jitter XBUF/27 MHz
Peak-to-peak period jitter
250
ps
t
9
Clock Jitter 74.25 MHz
1000-cycle long term jitter
430
ps
t
9
Clock Jitter XBUF/27 MHz
1000-cycle long term jitter
270
ps
t
10
PLL Lock Time
3
ms
Test and Measurement Set-up
AC Electrical Specifications
(V
DD
= 3.3V) (continued)
[3]
Parameter
[3]
Name
Description
Min.
Typ.
Max.
Unit
0.1
F
VDD
Outputs
C
LOAD
GND
DUT
Ordering Information
Ordering Code
Package
Name
Package Type
Operating Range
Operating
Voltage
Features
CY241V8ASXC-12
SZ08
8-pin SOIC
Commercial
3.3V
Linear VCXO control curve
CY241V8ASXC-12T
SZ08
8-pin SOIC Tape and Reel Commercial
3.3V
Linear VCXO control curve
Clock
Output
V
DD
50% of V
DD
0V
t
1
t
2
Figure 1. Duty Cycle Definition
Clock
Output
t
3
t
4
V
DD
80% of V
DD
20% of V
DD
0V
Figure 2. ER = (0.6 x V
DD
) /t3, EF = (0.6 x V
DD
) /t4
CY241V08A-12
Document #: 38-07676 Rev. **
Page 5 of 6
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.
Package Drawing and Dimensions
All product or company names mentioned in this document may be the trademarks of their respective holders.
SEATING PLANE
PIN 1 ID
0.230[5.842]
0.244[6.197]
0.157[3.987]
0.150[3.810]
0.189[4.800]
0.196[4.978]
0.050[1.270]
BSC
0.061[1.549]
0.068[1.727]
0.004[0.102]
0.0098[0.249]
0.0138[0.350]
0.0192[0.487]
0.016[0.406]
0.035[0.889]
0.0075[0.190]
0.0098[0.249]
1. DIMENSIONS IN INCHES[MM] MIN.
MAX.
0~8
0.016[0.406]
0.010[0.254]
X 45
2. PIN 1 ID IS OPTIONAL,
ROUND ON SINGLE LEADFRAME
RECTANGULAR ON MATRIX LEADFRAME
0.004[0.102]
8 Lead (150 Mil) SOIC - S08
1
4
5
8
3. REFERENCE JEDEC MS-012
PART #
S08.15 STANDARD PKG.
SZ08.15 LEAD FREE PKG.
4. PACKAGE WEIGHT 0.07gms
8-lead (150-Mil) SOIC S8
51-85066-*C
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