MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
1.1GHz Dual Modulus
Prescaler
The MC12026 is a high frequency, low voltage dual modulus prescaler
used in phase–locked loop (PLL) applications.
The MC12026A can be used with CMOS synthesizers requiring
positive edges to trigger internal counters such as Motorola’s MC145xxx
series in a PLL to provide tuning signals up to 1.1GHz in programmable
frequency steps.
The MC12026B can be used with CMOS synthesizers requiring
negative edges to trigger internal counters.
A Divide Ratio Control (SW) permits selection of an 8/9 or 16/17 divide
ratio as desired.
The Modulus Control (MC) selects the proper divide number after SW
has been biased to select the desired divide ratio.
MC12026A
MC12026B
MECL PLL COMPONENTS
÷8/9, ÷16/17
DUAL MODULUS PRESCALER
NOTE: The “B” Version Is Not Recommended for New Designs
•
•
•
•
•
•
•
1.1GHz Toggle Frequency
Supply Voltage 4.5V to 5.5V
Low Power 4.0mA Typical
Operating Temperature Range of –40°C to +85°C
The MC12026 is Pin Compatible With the MC12022
Short Setup Time (tset ) 6ns Typical @ 1.1GHz
Modulus Control Input Level is Compatible With Standard CMOS
and TTL
Pinout: 8–Lead Plastic
(Top View)
IN
8
NC
7
MC
6
GND
5
SW
H
H
L
1
IN
2
VCC
3
SW
4
OUT
L
D SUFFIX
8–LEAD PLASTIC SOIC PACKAGE
CASE 751–05
P SUFFIX
8–LEAD PLASTIC PACKAGE
CASE 626–05
FUNCTION TABLE
MC
H
L
H
L
Divide Ratio
8
9
16
17
Note: SW: H = VCC, L = OPEN
MC: H = 2.0V to VCC; L = GND to 0.8V
MAXIMUM RATINGS
Symbol
VCC
TA
Tstg
MC
IO
Power Supply Voltage, Pin 2
Operating Temperature Range
Storage Temperature Range
Modulus Control Input, Pin 6
Maximum Output Current, Pin 4
Characteristic
Range
–0.5 to +7.0
–40 to +85
–65 to +150
–0.5 to +6.5
10.0
Unit
Vdc
°C
°C
Vdc
mA
1/97
©
Motorola, Inc. 1997
1
REV 3
MC12026A MC12026B
ELECTRICAL CHARACTERISTICS
(VCC = 4.5 to 5.5; TA = –40 to +85°C)
Symbol
ft
ICC
VIH1
VIL1
VIH2
VIL2
Vout
Characteristic
Toggle Frequency (Sin Wave)
Supply Current Output Unloaded (Pin 2)
Modulus Control Input High (MC)
Modulus Control Input Low (MC)
Divide Ratio Control Input High (SW)
Divide Ratio Control Input Low (SW)
Output Voltage Swing
(RL = 560Ω; IO = 5.5mA)
1
(RL = 1.1kΩ; IO = 2.9mA)
2
Modulus Setup Time MC to Out
3
Input Voltage Sensitivity
100–250MHz
250–1100MHz
Min
0.1
—
2.0
GND
VCC – 0.5V
OPEN
1.0
Typ
1.4
4.0
—
—
VCC
OPEN
1.6
Max
1.1
5.3
VCC
0.8
VCC + 0.5V
OPEN
—
Unit
GHz
mA
V
V
V
—
Vp–p
tSET
Vin
—
400
100
6
—
—
9
1000
1000
ns
mVpp
1. Divide Ratio of
÷8/9
at 1.1GHz, CL = 8pF
2. Divide Ratio of
÷16/17
at 1.1GHz, CL = 8pF
3. Assuming RL = 560Ω at 1.1GHz
D
In
In
MC
C
Q
QB
D
C
Q
QB
D
Q
QB
C M
1
D
0
C
SW
Q
C
Q
Out
QB
D
QB
Figure 1. Logic Diagram (MC12026A)
Prop. Delay
In
Out
MC Setup
MC Release
Modulus setup time MC to out is the MC
setup or MC release plus the prop delay.
MC
Figure 2. Modulus Setup Time
MOTOROLA
2
HIPERCOMM
BR1334 — Rev 4
MC12026A MC12026B
VCC = 4.5 to 5.5V
C3
SINE WAVE GENERATOR
C1
IN
50
Ω
C2
OUT
IN
MC
GND
RL
CL
VCC
SW
MC INPUT
EXTERNAL COMPONENTS
C1 = C2 = 1000 pF
C3 = 0.1µF
CL = 8pF (Including Scope and Jig Capacitance)
RL = 560Ω (for
÷8/9
at 1.1GHz)
Figure 3. AC Test Circuit
+15.0
+10.0
+5.0
0
–5.0
AMPLITUDE (dBm)
–10.0
–15.0
–20.0
–25.0
–30.0
–35.0
–40.0
–45.0
–50.0
0
200
400
600
800
1000
1200
1400
1600
FREQUENCY (MHz)
+1257.40
+707.11
AMPLITUDE (dBm)
1200
800
400
0
200
400
600
800
1000
1200
1400
1600
0
1800
FREQUENCY (MHz)
Figure 5. Output Amplitude versus Input Frequency
HIPERCOMM
BR1334 — Rev 4
3
MOTOROLA
MILLIVOLTS
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
OPERATING
WINDOW
+397.64
+223.61
+125.74
+70.71
+39.76
+22.36
+12.57
+7.07
+3.98
+2.24
+1.26
+0.71
1800
MILLIVOLTS
Figure 4. Input Signal Amplitude versus Input Frequency
Divide Ratio = 8; VCC = 5.0V; TA = 25°C
2000
1600