Order this document by MC12079/D
2.8GHz 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 of64, 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 Power 9mA Typical at VCC = 5.0 V
•Operating Temperature Range of ±40 to 85°C
FUNCTIONAL TABLE
SW1 |
SW2 |
Divide Ratio |
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H |
H |
64 |
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H |
L |
128 |
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L |
H |
128 |
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L |
L |
256 |
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NOTE: SW1 & SW2: H = VCC, L = Open.
MAXIMUM RATINGS
Characteristic |
Symbol |
Range |
Unit |
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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.
MC12079
MECL PLL COMPONENTS64/128/256 PRESCALER
SEMICONDUCTOR
TECHNICAL DATA
8 
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO±8)
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
PIN CONNECTIONS
IN |
1 |
8 |
IN |
V |
2 |
7 |
NC |
CC |
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SW1 |
3 |
6 |
SW2 |
OUT |
4 |
5 |
Gnd |
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(Top View) |
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ORDERING INFORMATION
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Operating |
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Device |
Temperature Range |
Package |
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MC12079D |
TA = ± 40° to +85°C |
SO±8 |
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MC12079P |
Plastic |
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Motorola, Inc. 1997 |
Rev 3 |
MC12079
ELECTRICAL CHARACTERISTICS (VCC = 4.5 to 5.5 V; TA = ±40 to 85°C, unless otherwise noted.)
Parameter |
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Symbol |
Min |
Typ |
Max |
Unit |
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Toggle Frequency (Sine Wave) |
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ft |
0.25 |
3.4 |
2.8 |
GHz |
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Supply Current Output (Pin 2) |
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ICC |
± |
9.0 |
11.5 |
mA |
Input Voltage Sensitivity |
250±500 MHz |
Vin |
400 |
± |
1000 |
mVpp |
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500±2800 MHz |
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100 |
± |
1000 |
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Divide Ratio Control Input High (SW) |
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VIH |
VCC |
VCC |
VCC |
V |
Divide Ratio Control Input Low (SW) |
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VIL |
Open |
Open |
Open |
± |
Output Voltage Swing |
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Vout |
1.0 |
1.6 |
± |
Vpp |
(CL = 12 pF; RL = 1.2 kΩ; IO = 2.7 mA)1 |
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(CL = 12 pF; RL = 2.2 kΩ; IO = 1.5 mA)2 |
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(CL = 12 pF; RL = 3.9 kΩ; IO = 0.85 mA)3 |
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NOTES: 1. Divide ratio of 64 at 2.8 GHz.
2.Divide ratio of 128 at 2.8 GHz.
3.Divide ratio of 256 at 2.8 GHz.
Figure 1. Logic Diagram (MC12079)
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In |
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D |
QB |
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D |
Q |
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D |
QB |
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C |
Q |
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C |
QB |
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Q |
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D |
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D |
QB |
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C |
QB |
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C |
Q |
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D |
QB |
D |
QB |
D |
QB |
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C |
Q |
C |
Q |
C |
Q |
Out |
SW2 |
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SW1 |
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Figure 2. AC Test Circuit |
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VCC = 4.5 to 5.5 V |
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C3 |
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SINE WAVE GENERATOR |
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VCC |
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C1 |
IN |
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SW1 |
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50 Ω |
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SW2 |
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C2 |
IN |
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OUT |
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GND |
CL |
R |
EXTERNAL COMPONENTS |
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L |
C1 = C2 = 1000 pF |
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C3 = 0.1 μF |
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CL = 12 pF (Including Scope and Jig Capacitance) |
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RL = 1.2 kΩ (for 64 at 2.8 GHz) |
2 |
MOTOROLA RF/IF DEVICE DATA |
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