P2082A ALSC | Alldatasheet
Document overview
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Technical content
Features
Generates 2X and 4X clocks of the input clock frequency Input clock frequency range from 3 MHz to 78 MHz Provides up to: P2082A: 156 MHz output clock frequency P2084A: 312 MHz output clock frequency External loop filter Low cycle-to-cycle jitter 3.3 V operating voltage range 10 mA output drives TTL or CMOS compatible outputs Ultra-low power CMOS design Available in industrial temperature range (-25C to +85C) Available in 8-pin SOIC and TSSOP Product Description The P2082A and P2084A are versatile frequency multipliers that are designed specifically as cost effective alternatives to the high precision frequency oscillator. The P2082A/84A can generate a 2X and 4X output clock respectively of the input fr equency which allows system cost savings by using an inexpensive crystal or resonator to achieve high frequency multiplication. The P2082A/84A provides up to 156 MHz and 312 MHz output clock frequencies respectively through the use of the Phase-Lock-Loop (PLL) technique which delivers low jitter and high precision synthesized clocks.
Applications
The P2082A/84A is targeted towards the high frequency CAN OSC replacement market. Applications include xDSL, routers, networking, PC peripherals, and embedded systems. Block Diagram
rev 0.4 Low Cost Frequency Multiplier 2 of 9 Notice: The information in this document is subject to change without notice. Pin Configuration Pin Description Pin# Pin Name Type Description 1 XIN/CLKIN I Connect to crystal or clock input. 2 XOUT I Crystal output. 3 FS1 I Digital logic input used to select input frequency range. (See Input Frequency Selection.) This pin has an internal pull-up resistor. 4 LF I External loop filter for the PLL. (See Loop Filter Selection Table for value.) 5 VSS P Ground connection. Connect to system ground. 6 CLKOUT O Clock output. 7 FS0 I Digital logic input used to select input frequency range. (See Input Frequency Selection.) This pin has an internal pull-up resistor. 8 VDD P Connect to +3.3 V. Input Frequency Selection Output Frequency Scaling FS1 FS0 Input (MHz) P2082A P2084A 0 0 3 to 9 6 to 18 12 to 36 0 1 10 to 19 20 to 38 40 to 76 1 0 20 to 38 40 to 76 80 to 152 1 1 39 to 78 78 to 156 156 to 312
rev 0.4 Low Cost Frequency Multiplier 3 of 9 Notice: The information in this document is subject to change without notice. Loop Filter Selection Table VDD 3.3 V Input (MHz) FS1 FS0 C1(pF) C2(pF) R1 (ohms) 3 0 0 270 330,000 220 4 0 0 270 100,000 270 5 0 0 270 100,000 390 6 0 0 270 100,000 510 7 0 0 270 100,000 620 8 0 0 270 100,000 820 9 0 0 270 100,000 1,000 10 0 1 270 100,000 330 11 0 1 270 100,000 390 12 0 1 270 100,000 510 13 0 1 270 100,000 560 14 0 1 270 100,000 620 15 0 1 270 100,000 750 16 0 1 270 100,000 820 17 0 1 270 100,000 910 18 0 1 270 100,000 1,000 19 0 1 270 100,000 1,200 20 1 0 270 100,000 330 21 - 22 1 0 270 100,000 390 23 - 24 1 0 270 100,000 510 25 - 26 1 0 270 100,000 560 27 - 28 1 0 270 100,000 620 29 - 30 1 0 270 100,000 750 31 - 32 1 0 270 100,000 820 33 - 34 1 0 270 100,000 910 35 - 36 1 0 270 100,000 1,000 37 - 38 1 0 270 100,000 1,200 39 - 42 1 1 270 100,000 330 43 - 46 1 1 270 100,000 390 47 - 50 1 1 270 100,000 510 51 - 54 1 1 270 100,000 560 55 - 58 1 1 270 100,000 620 59 - 62 1 1 270 100,000 750 63 - 66 1 1 270 100,000 820 67 - 70 1 1 270 100,000 910 71 - 74 1 1 270 100,000 1,000 75 - 78 1 1 270 100,000 1,200
rev 0.4 Low Cost Frequency Multiplier 4 of 9 Notice: The information in this document is subject to change without notice. Output Clock Selection Example The P2084A can generate 4X from the input reference fr equency. P2084A’s internal crystal oscillator circuits allow the use of an inexpensive crystal of resonator to replace expensive can osc illators that are used in networking, PC peripherals, xDSL, and consumer applications for high frequency generation. Its input frequency range is optimized for operation from 3 MHz to 78 MHz, and its output frequency can deliver up to 312 MHz.
rev 0.4 Low Cost Frequency Multiplier 5 of 9 Notice: The information in this document is subject to change without notice. Absolute Maximum Ratings Symbol Parameter Rating Unit VDD, VIN Voltage on any pin with respect to GND -0.5 to + 7.0 V TSTG Storage temperature -65 to +125 °C TA Operating temperature 0 to 70 °C Symbol Parameter Min Typ Max Unit VIL Input low voltage GND - 0.3 – 0.8 V VIH Input high voltage 2.0 – VDD + 0.3 V IIL Input low current (internal input pull-up resistor on FS0 and FS1) – 60 – µA IIH Input high current (internal input pull-up resistor on FS0 and FS1) – 0 – µA IXOL XOUT output low current – 10 – mA IXOH XOUT output high current – 10 – mA VOL Output low voltage (VDD = 3.3 V, IOL = 20 mA) – – 0.4 V VOH Output high voltage (VDD = 3.3 V, IOH = 20 mA) 2.5 – – V IDD Static supply current – 3 – mA ICC Typical dynamic supply current (25 pF scope probe loading) 5.2 at 3 MHz 21.2 at
82 MHz mA
VDD Operating voltage 3.0 3.3 3.6 V tON Power-up time (CLOOP = 0.1 µF at 16 MHz, first locked cycle after power up) – 7 – mS ZOUT Clock output impedance (at 16 MHz) – 28 – Ω Symbol Parameter Min Typ Max Unit fIN Input frequency 3 – 78 MHz P2082A 6 – 156 MHz fOUT P2084A 12 312 MHz tLH Output rise time (measured at 0.8 V to 2.0 V) 1 ns tHL Output fall time (measured at 2.0 V to 0.8 V) 1 ns tJC Jitter (cycle to cycle) – ±200 – ps tD Output duty cycle 45 50 55 % 1 tLH and tHL are measured into a capacitive load of 15 pF
rev 0.4 Low Cost Frequency Multiplier 6 of 9 Notice: The information in this document is subject to change without notice.
Package Information
Mechanical Package Outline 8-Pin SOIC Dimensions in inches Dimensions in millimeters Symbol Min Nor Max Min Nor Max e 0.050 BSC 1.27 BSC Note: Controlling dimensions are millimeters SOIC – 0.074 grams unit weight
rev 0.4 Low Cost Frequency Multiplier 7 of 9 Notice: The information in this document is subject to change without notice. Mechanical Package Outline 8-Pin TSSOP Dimensions in inches Dimensions in millimeters Symbol Min Nor Max Min Nor Max A 0.047 1.10 A1 0.002 0.006 0.05 0.15 B 0.007 0.012 0.19 0.30 C 0.004 0.008 0.09 0.20 e 0.026 BSC 0.65 BSC Note: Controlling dimensions are millimeters TSSOP – 0.034 grams unit weight
rev 0.4 Low Cost Frequency Multiplier 8 of 9 Notice: The information in this document is subject to change without notice. Ordering Codes Part Number Marking Package Type Qty per reel Temperature (°C) P208XA-08ST P208XA 8-pin SOIC, tube 0 to 70 P208XA-08SR P208XA 8-pin SOIC, tape & reel 2500 0 to 70 P208XA-08TT P208XA 8-pin TSSOP, tube 0 to 70 P208XA-08TR P208XA 8-pin TSSOP, tape & reel 2500 0 to 70 Device Ordering Information X 208XAX-08 XX Licensed under US patent Nos 5,488,627 and 5,631,920. Advance datasheet. Specification subject to change without notice. Package: ST – SOIC, TUBE SR - SOIC, T/R TT – TSSOP, TUBE TR - TSSOP, T/R F = Pb FREE Flow: P = Commercial Temperature Range (0°C to 70°C) I = Industrial Temperature Range (-25°C to 85°C) A = Automotive Temperature Range (-40°C to 125°C) Pin Count DEVICE NUMBER
rev 0.4 Low Cost Frequency Multiplier 9 of 9 Notice: The information in this document is subject to change without notice. © Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make ch anges to this document and its products at any time without notice. Alliance assumes no responsibility for any errors t hat may appear in this document. The data contained herein represents Alliance's best data and/or estimate s at the time of issuance. Alliance rese rves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not in tended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or lia bility arising out of the applic ation or use of any product described herein, and disclaims any express or implied warrant ies related to the sale and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, mercha ntability, or infringement of any intellec tual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any pa tent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alli ance or third parties. Alliance does not aut horize its products for use as critical components in life-supporting systems where a malfunction or fa ilure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use. Alliance Semiconductor Corporation 2595, Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Copyright © Alliance Semiconductor All Rights Reserved Advance Information Part Number: P2082A/P2084A Document Version: v 0.4