ML12079
2.8 GHz Prescaler
MECL PLL Components
÷64/128/256 Prescaler
Legacy Device: Motorola MC12079
The ML12079 is a single modulus divide by 64, 128, 256 prescaler
for low power frequency division of a 2.8 GHz (typical) high frequen-
cy input signal. Divide ratio control inputs SW1 and SW2 select the
required divide ratio of ÷64, ÷128, or ÷256.
8
An external load resistor is required to terminate the output. A 1.2
1
kΩ resistor is recommended to achieve a 1.6 V output swing, when
pp
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
SO 8 = -5P
PLASTIC PACKAGE
CASE 751
are included in the V specification for various divide ratios at 2.8
out
GHz input frequency.
• 2.8 GHz Toggle Frequency
• Supply Voltage 4.5 to 5.5 V
8
• Low Supply Current 9mA Typical at V
= 5.0 V
1
CC
• Operating Temperature Range of T = –40 to 85°C
A
P DIP 8 = PP
PLASTIC PACKAGE
CASE 626
FUNCTIONAL TABLE
CROSS REFERENCE/ORDERING INFORMATION
SW1
SW2
Divide Ratio
PACKAGE
MOTOROLA
LANSDALE
H
H
L
H
L
64
P DIP 8
SO 8
MC12079P
MC12079D
ML12079PP
ML12079-5P
128
128
256
H
L
Note: Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from ML to MLE.
L
NOTE: SW1 & SW2: H = V , L = Open.
CC
MAXIMUM RATINGS
Characteristic
Symbol
Range
–0.5 to 7.0
–40 to 85
–65 to 150
4.0
Unit
Vdc
°C
PIN CONNECTIONS
Power Supply Voltage, Pin 2
Operating Temperature Range
Storage Temperature Range
Maximum Output Current, Pin 4
V
CC
T
A
1
2
3
4
8
7
6
5
IN
IN
T
stg
°C
V
NC
SW2
CC
SW1
I
O
mA
Gnd
OUT
(Top View)
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