MC12079

SEMICONDUCTOR

TECHNICAL DATA

MECL PLL COMPONENTS

÷64/128/256 PRESCALER

Order this document by MC12079/D

P SUFFIX

PLASTIC PACKAGE

CASE 626

PIN CONNECTIONS

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

8

1

1

8

IN

(Top View)

8

IN

VCC

SW1

OUT

NC

SW2

Gnd

7

6

5

1

2

3

4

Device

Operating

Temperature Range

Package

ORDERING INFORMATION

MC12079D

MC12079P

TA = – 40° to +85°C

SO–8

Plastic

2.8 GHz Prescaler

The MC12079 is a single modulus divide by 64, 128, 256 prescaler for low

power frequency division of a 2.8 GHz (typical) high frequency input signal.

Divide ratio control inputs SW1 and SW2 select the required divide ratio of

÷64, ÷128, or ÷256.

An external load resistor is required to terminate the output. A 1.2 k

Ω

resistor is recommended to achieve a 1.6 Vpp output swing, when dividing a

1.1 GHz input signal by the minimum divide ratio of 64, assuming a 12 pF

load. Output current can be minimized dependent on conditions such as

output frequency, capacitive load being driven, and output voltage swing

required. Typical values for load resistors are included in the Vout

specification for various divide ratios at 2.8 GHz input frequency.

FUNCTIONAL TABLE

SW1

SW2

Divide Ratio

H

H

64

H

L

128

L

H

128

L

L

256

NOTE:

SW1 & SW2: H = VCC, L = Open.

MAXIMUM RATINGS

Characteristic

Symbol

Range

Unit

Power Supply Voltage, Pin 2

VCC

–0.5 to 7.0

Vdc

Operating Temperature Range

TA

–40 to 85

°C

Storage Temperature Range

Tstg

–65 to 150

°C

Maximum Output Current, Pin 4

IO

4.0

mA

NOTE:

ESD data available upon request.

© Motorola, Inc. 1997

Rev 3