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P2084A Low Cost Frequency Multiplier
Features
* Generates 2x and 4x clocks of the input clock frequency * Input clock frequency range from 3MHz to 78MHz * P2084A: 312MHz output clock frequency * External loop filter * Low Cycle-to-Cycle Jitter * 3.3V operating voltage range * 10mA output drives * TTL or CMOS compatible outputs * Ultra-low power CMOS design * Available in 8-pin SOIC The P2084A can generate a 4x output clock of the input frequency which allows system cost savings by using an inexpensive crystal or resonator to achieve high frequency multiplication. The P2084A provides up to 312MHz output clock frequencies respectively through the use of the PhaseLock-Loop (PLL) technique which delivers low jitter and high precision synthesized clocks.
Applications
The P2084A is targeted towards the high frequency CAN OSC replacement market. Applications include xDSL, routers, networking, PC peripherals, and embedded systems.
Product Description
P2084A is a versatile frequency multiplier that is designed specifically as cost effective alternatives to the high precision frequency oscillator.
Block Diagram
FS0
FS1
LF
VDD
PLL Modulation XIN / CLKIN XOUT Crystal Oscillator
Frequency Divider Feedback Divider Phase Detector VCO
Output Divider
ModOUT
VSS
(c)2010 SCILLC. All rights reserved. MARCH 2010 - Rev. 1
Publication Order Number: P2084/D
P2084A
Pin Configuration
XIN / CLKIN
1
8 7 6 5
VDD
XOUT 2 FS1 LF
3 4
P2084A
FS0 CLKOUT VSS
Pin Description Pin#
1 2 3 4 5 6 7 8
Pin Name
XIN / CLKIN XOUT FS1 LF VSS CLKOUT FS0 VDD
Type
I I I I P O I P Connect to crystal or clock input.
Description
Crystal connection. If using an external reference, this pin must be left unconnected. Digital logic input used to select input frequency range. (See Input Frequency Selection.) This pin has an internal pull-up resistor. External loop filter for the PLL. (See Loop Filter Selection Table for value.) Ground connection. Connect to system ground. Clock output. Digital logic input used to select input frequency range. (See Input Frequency Selection.) This pin has an internal pull-up resistor. Connect to +3.3V.
Input Frequency Selection
Output Frequency Scaling FS1 0 0 1 1 FS0 0 1 0 1 Input (MHz)
P2084A
3 to 9 10 to 19 20 to 38 39 to 78 12 to 36 40 to 76 80 to 152 156 to 312
Rev. 1 | Page 2 of 7 | www.onsemi.com
P2084A
Loop Filter Selection Table VDD 3.3V
Input (MHz) 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 - 22 23 - 24 25 - 26 27 - 28 29 - 30 31 - 32 33 - 34 35 - 36 37 - 38 39 - 42 43 - 46 47 - 50 51 - 54 55 - 58 59 - 62 63 - 66 67 - 70 71 - 74 75 - 78
FS1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
FS0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1
C1(pF) 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270
C2(pF) 330,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000 100,000
R1 (ohms) 220 270 390 510 620 820 1,000 330 390 510 560 620 750 820 910 1,000 1,200 330 390 510 560 620 750 820 910 1,000 1,200 330 390 510 560 620 750 820 910 1,000 1,200
Rev. 1 | Page 3 of 7 | www.onsemi.com
P2084A
Output Clock Selection Example
The P2084A can generate 4x from the input reference frequency. P2084A's internal crystal oscillator circuits allow the use of an inexpensive crystal of resonator to replace expensive can oscillators that are used in networking, PC peripherals, xDSL, and consumer applications for high frequency generation. Its input frequency range is optimized for operation from 3MHz to 78MHz, and its output frequency can deliver up to 312MHz.
VDD
1
XIN
P2084A
VDD 8 0
VDD
VDD 0 0 C2 CL CL
2 3
XOUT FS1 LF
FS0 CLKOUT VSS
7
0
6 5
R1
4
C1
Rev. 1 | Page 4 of 7 | www.onsemi.com
P2084A
Absolute Maximum Ratings Symbol
VDD TSTG Ts TJ TDV Storage temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B)
Parameter
Rating
-0.5 to +4.6 -65 to +125 260 150 2
Unit
V C C C KV
Voltage on any pin with respect to Ground
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability.
Operating Conditions Parameter
VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance Input Capacitance
Description
Min
3.0 -40
Max
3.6 +85 15 7
Unit
V C pF pF
DC Electrical Characteristics Symbol Parameter
VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current (internal input pull-up resistor on FS0 and FS1) Input high current (internal input pull-up resistor on FS0 and FS1) XOUT output low current XOUT output high current Output low voltage (VDD = 3.3V, IOL = 20mA) Output high voltage (VDD = 3.3V, IOH = 20mA) Static supply current Typical dynamic supply current (25pF scope probe loading) Operating voltage Power-up time (CLOOP = 0.1F at 16MHz, first locked cycle after power up) Clock output impedance (at 16MHz)
Min
GND-0.3 2.0
Typ
Max
0.8 VDD+0.3
Unit
V V A A mA mA
60 0 10 10 0.4 2.5 3 5.2 at 3MHz 3.0 3.3 7 28 21.2 at 82MHz 3.6
V V mA mA V mS
AC Electrical Characteristics Symbol
fIN
1 tLH
Parameter
Min
3 12
Typ
Max
78 312
Unit
MHz MHz ns ns ps
Input frequency P2084A Output rise time (measured at 0.8V to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle-to-cycle) Output duty cycle
1 1 200 45 50 55
tHL
1
tJC tD
%
Note: 1. tLH and tHL are measured into a capacitive load of 15 pF.
Rev. 1 | Page 5 of 7 | www.onsemi.com
P2084A
8-Pin SOIC
E
H
D
A2
A
e A 1 B
C L
D
Dimensions Inches Min Max
0.010 0.069 0.059 0.020 0.010 0.004 0.053 0.049 0.012 0.007
Symbol
A1 A A2 B C D E e H L
Millimeters Min
0.10 1.35 1.25 0.31 0.18 4.90 BSC 3.91 BSC 1.27 BSC 6.00 BSC 0.41 0 1.27 8
Max
0.25 1.75 1.50 0.51 0.25
0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0 0.050 8
Rev. 1 | Page 6 of 7 | www.onsemi.com
P2084A
Ordering Codes Part Number
P2084AF-08ST P2084AF-08SR
Marking
ABM ABM
Package Type
8-pin SOIC, tube, Pb Free 8-pin SOIC, tape & reel, Pb Free
Qty per reel
Temperature
0 to +70 C C
2500
0 to +70 C C
A "microdot" placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free
Licensed under US patent #5,488,627 and #5,631,920. Advance datasheet. Specification subject to change without notice.
Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. U.S Patent Pending; Timing-Safe and Active Bead are trademarks of PulseCore Semiconductor, a wholly owned subsidiary of ON Semiconductor. This literature is subject to all applicable copyright laws and is not for resale in any manner.
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