Datasheet DS8673N Datasheet (NSC)

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-

Block and Connection Diagrams

Dual-In-Line Package

ucts. The DS8674 is pin compatible with Plessey’s SP4653
and Motorola’s MC12074 products.

Features

Y

1.0 GHz operating frequency

Y

25 mA typical supply current

Y

20 mV rms input sensitivity

Y

0.8V complementary ECL outputs

Y

Low output radiation

DS8673/DS8674 Low Power VHF/UHF Prescalers

April 1988

Top View

TL/F/9340– 1

Order Number DS8673N or DS8674N

See NS Package Number N08E

TL/F/9340– 2

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

TL/F/9340

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 7V

Output Voltage V

Operating Free Air Temperature Rangeb40§Ctoa85§C

Storage Temperature Range

ESD rating is to be determined.

b

a

0.5V

CC

65§Ctoa150§C

Recommended Operating Conditions

Symbol Parameter Conditions Min Typ Max Units

V

CC

F

IN

V

IN

Power Supply Voltage Range 4.5 5.5 V

Input Frequency Range VINMin 80 1,000 MHz

Input Sensitivity into 50X 80 MHz 20 200

300 MHz 20 200
500 MHz 20 200 mV rms
700 MHz 20 200

1 GHz 20 200

DC Electrical Characteristics

Symbol Parameter Conditions Min Typ Max Units

I

CC

V

OUT

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.

Power Supply Current V

Output Voltage Swing Peak-to-Peak

e

5.5V 25 35 mA

CC

(no load)

0.8 1.2 1.6 V

Typical Applications

Typical Wiring Configuration

TL/F/9340– 3

2

Typical Applications (Continued)

Reference valuee50X

e

25 mV

Vi (rms)

e

5V

V

CC

Waveshape is TBD

Typical Sensitivity Curve Under Nominal Conditions

Typical Input Impedance

TL/F/9340– 4

TL/F/9340– 5

3

Physical Dimensions inches (millimeters) Lit.

Molded Dual-In-Line Package (N)

Order Number DS8673N or DS8674N

NS Package Number N08E

DS8673/DS8674 Low Power VHF/UHF Prescalers

Ý

103367

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 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.

National Semiconductor National Semiconductor National Semiconductor National Semiconductor
Corporation Europe Hong Kong Ltd. Japan Ltd.

1111 West Bardin Road Fax: (
Arlington, TX 76017 Email: [e-mail] Ocean Centre, 5 Canton Rd. Fax: [phone]
Tel: [phone] Deutsch Tel: (
Fax: [phone] English Tel: (

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.

Fran3ais Tel: (
Italiano Tel: (

a

49) 0-180-530 85 86 13th Floor, Straight Block, Tel: [phone]

a

49) 0-180-530 85 85 Tsimshatsui, Kowloon

a

49) 0-180-532 78 32 Hong Kong

a

49) 0-180-532 93 58 Tel: [phone]

a

49) 0-180-534 16 80 Fax: [phone]