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TND305 Tiny 6-Pin Device Forms Tiny RC Oscillator
Prepared by: Fred Zlotnick ON Semiconductor http://onsemi.com
TECHNICAL NOTE
Many times a designer needs a small, low power oscillator to provide a clock signal that does not need to be particularly accurate, just reliable. There are many suppliers who can supply an crystal oscillator, with high accuracy that costs several dollars each. This article shows how to build a 500 KHz oscillator occupying 1/2-in2 , and costing less than $0.50 each for all the components. The circuit is comprised of a single 6-pin device (NL27WZ04 from ON Semicon- ductor), 2 resistors and one capacitor. The nominal operating volts will be 2.3 to 5.0 volts. The device frequency can be described approximately as follows: f = 1/(2.2 R1C) Hz R2 > 8 R1, C >50 pf To operate at 500 KHz, we allow C=75 pf, and R1 to be 12K, and R2 to be 100K Figure 1 shows a simple circuit based on a new two-gate logic IC that functions as a 500 KHz Oscillator with strong drive operating at 3.3 volts with a minimum number of components. The circuit features the NL27WZ04, available in a micro-miniature 6-pin SC-88 (SOT-363) package that occupies only 4.5 mm2.
VCC 2.3 to 5.0 V OSC Out 5 1 6 C NL27WZ04 R1 R2 3 2 GND 4
A1 GND A2
Y1 VCC Y2
Figure 1. Tiny RC Oscillator
(c) Semiconductor Components Industries, LLC, 2001
1
July, 2001 - Rev. 0
Publication Order Number: TND305/D
TND305
Notes
ON Semiconductor and are 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.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: ONlit@hibbertco.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-0031 Phone: 81-3-5740-2700 Email: r14525@onsemi.com ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative.
http://onsemi.com
2
TND305/D

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