DS8673/DS8674 Low Power VHF/UHF Prescalers General Description The DS8673 and DS8674 products are low power prescalers which divide by 64 and 256 respectively. The devices are used in frequency synthesis applications such as TV/ CATV, cellular phone, and instrumentation to divide a very high frequency down to a frequency usable by low power MOS PLL’s. The devices have differential buffered inputs and complementary ECL outputs. The inputs provide high input sensitivity and good isolation. The DS8673 is pin compatible with Plessey’s SP4531, SP4632, and Motorola’s MC12073 prod- ucts. The DS8674 is pin compatible with Plessey’s SP4653 and Motorola’s MC12074 products. Features Y Y Y Y Y 1.0 GHz operating frequency 25 mA typical supply current 20 mV rms input sensitivity 0.8V complementary ECL outputs Low output radiation Block and Connection Diagrams Dual-In-Line Package TL/F/9340 – 1 Top View Order Number DS8673N or DS8674N See NS Package Number N08E TL/F/9340 – 2 C1995 National Semiconductor Corporation TL/F/9340 RRD-B30M105/Printed in U. S. A. DS8673/DS8674 Low Power VHF/UHF Prescalers April 1988 Absolute Maximum Ratings (Note 1) Output Voltage VCC a 0.5V If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Operating Free Air Temperature Range Supply Voltage Input Voltage ESD rating is to be determined. Storage Temperature Range 7V 7V b 40§ C to a 85§ C b 65§ C to a 150§ C Recommended Operating Conditions Symbol Parameter VCC Power Supply Voltage Range FIN Input Frequency Range VIN Input Sensitivity into 50X Conditions Min Typ Max Units 4.5 5.5 V VIN Min 80 1,000 MHz 80 MHz 300 MHz 500 MHz 700 MHz 1 GHz 20 20 20 20 20 200 200 200 200 200 mV rms Conditions Min DC Electrical Characteristics Symbol Parameter ICC Power Supply Current VCC e 5.5V VOUT Output Voltage Swing Peak-to-Peak (no load) 0.8 Typ Max Units 25 35 mA 1.2 1.6 V Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. Except for ‘‘Operating Temperature Range’’ they are not meant to imply that the devices should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation. Typical Applications Typical Wiring Configuration TL/F/9340 – 3 2 Typical Applications (Continued) Typical Input Impedance Reference value e 50X Vi (rms) e 25 mV VCC e 5V Waveshape is TBD TL/F/9340 – 4 Typical Sensitivity Curve Under Nominal Conditions TL/F/9340 – 5 3 DS8673/DS8674 Low Power VHF/UHF Prescalers Physical Dimensions inches (millimeters) Lit. Ý 103367 Molded Dual-In-Line Package (N) Order Number DS8673N or DS8674N NS Package Number N08E LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Europe Fax: (a49) 0-180-530 85 86 Email: cnjwge @ tevm2.nsc.com Deutsch Tel: (a49) 0-180-530 85 85 English Tel: (a49) 0-180-532 78 32 Fran3ais Tel: (a49) 0-180-532 93 58 Italiano Tel: (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2309 Fax: 81-043-299-2408 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.