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.
An external load resistor is required to terminate the output. A 1.2
kΩ 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.
•
•
•
•
2.8 GHz Toggle Frequency
Supply Voltage 4.5 to 5.5 V
Low Supply Current 9mA Typical at VCC = 5.0 V
Operating Temperature Range of TA = –40 to 85°C
8
1
SO 8 = -5P
PLASTIC PACKAGE
CASE 751
8
1
FUNCTIONAL TABLE
SW1
H
H
L
L
NOTE:
P DIP 8 = PP
PLASTIC PACKAGE
CASE 626
CROSS REFERENCE/ORDERING INFORMATION
MOTOROLA
PACKAGE
LANSDALE
P DIP 8
MC12079P
ML12079PP
SO 8
MC12079D
ML12079-5P
SW2
H
L
H
L
Divide Ratio
64
128
128
256
SW1 & SW2: H = VCC, L = Open.
Note:
Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from
ML
to
MLE.
MAXIMUM RATINGS
Characteristic
Power Supply Voltage, Pin 2
Operating Temperature Range
Storage Temperature Range
Maximum Output Current, Pin 4
Symbol
VCC
TA
Tstg
IO
Range
–0.5 to 7.0
–40 to 85
–65 to 150
4.0
Unit
Vdc
°C
°C
mA
IN
VCC
SW1
OUT
1
2
3
4
8
7
6
5
PIN CONNECTIONS
IN
NC
SW2
Gnd
(Top View)
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