MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
1
REV 3
Motorola, Inc. 1997
1/97
1.1GHz Dual Modulus
Prescaler
The MC12026 is a high frequency, low voltage dual modulus prescaler
used in phaselocked 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.
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: 8Lead Plastic (Top View)
8
1
IN
IN
7
2
NC
VCC
6
3
MC
SW
5
4
GND
OUT
MAXIMUM RATINGS
Symbol
Characteristic
Range
Unit
VCC
Power Supply Voltage, Pin 2
0.5 to +7.0
Vdc
TA
Operating Temperature Range
40 to +85
C
Tstg
Storage Temperature Range
65 to +150
C
MC
Modulus Control Input, Pin 6
0.5 to +6.5
Vdc
IO
Maximum Output Current, Pin 4
10.0
mA
MC12026A
MC12026B
MECL PLL COMPONENTS
8/9,
16/17
DUAL MODULUS PRESCALER
FUNCTION TABLE
SW
MC
Divide Ratio
H
H
L
L
H
L
H
L
8
9
16
17
Note: SW: H = VCC, L = OPEN
MC: H = 2.0V to VCC; L = GND to 0.8V
P SUFFIX
8LEAD PLASTIC PACKAGE
CASE 62605
D SUFFIX
8LEAD PLASTIC SOIC PACKAGE
CASE 75105
MC12026A MC12026B
MOTOROLA
HIPERCOMM
BR1334 -- Rev 4
2
ELECTRICAL CHARACTERISTICS (VCC = 4.5 to 5.5; TA = 40 to +85
C)
Symbol
Characteristic
Min
Typ
Max
Unit
ft
Toggle Frequency (Sin Wave)
0.1
1.4
1.1
GHz
ICC
Supply Current Output Unloaded (Pin 2)
--
4.0
5.3
mA
VIH1
Modulus Control Input High (MC)
2.0
--
VCC
V
VIL1
Modulus Control Input Low (MC)
GND
--
0.8
V
VIH2
Divide Ratio Control Input High (SW)
VCC 0.5V
VCC
VCC + 0.5V
V
VIL2
Divide Ratio Control Input Low (SW)
OPEN
OPEN
OPEN
--
Vout
Output Voltage Swing
(RL = 560
; IO = 5.5mA)1
(RL = 1.1k
; IO = 2.9mA)2
1.0
1.6
--
Vpp
tSET
Modulus Setup Time MC to Out3
--
6
9
ns
Vin
Input Voltage Sensitivity
100250MHz
2501100MHz
400
100
--
--
1000
1000
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 = 560
at 1.1GHz
D
Q
C
QB
D
Q
C
QB
D
Q
C
QB
M
In
In
MC
D
C
QB
Q
D
C
QB
Q
Out
Figure 1. Logic Diagram (MC12026A)
1
0
SW
Figure 2. Modulus Setup Time
Modulus setup time MC to out is the MC
setup or MC release plus the prop delay.
Prop. Delay
In
Out
MC
MC Setup
MC Release
MC12026A MC12026B
HIPERCOMM
BR1334 -- Rev 4
3
MOTOROLA
Figure 3. AC Test Circuit
SINE WAVE GENERATOR
50
C1
C2
MC INPUT
C3
VCC = 4.5 to 5.5V
CL
RL
VCC
SW
IN
IN
MC
GND
OUT
EXTERNAL COMPONENTS
C1 = C2 = 1000 pF
C3 = 0.1
F
CL = 8pF (Including Scope and Jig Capacitance)
RL = 560
(for
8/9 at 1.1GHz)
0
200
400
600
800
1000
1200
1400
1600
1800
Figure 4. Input Signal Amplitude versus Input Frequency
Divide Ratio = 8; VCC = 5.0V; TA = 25
C
+15.0
+10.0
+5.0
0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
+1257.40
+0.71
+1.26
+2.24
+3.98
+7.07
+12.57
+22.36
+39.76
+70.71
+125.74
+223.61
+397.64
+707.11
0
200
400
600
800
1000
1200
1400
1600
1800
FREQUENCY (MHz)
AMPLITUDE (dBm)
MILLIVOL
TS
FREQUENCY (MHz)
0
400
800
1200
1600
2000
MILLIVOL
TS
AMPLITUDE (dBm)
Figure 5. Output Amplitude versus Input Frequency
OPERATING
WINDOW
MC12026A MC12026B
MOTOROLA
HIPERCOMM
BR1334 -- Rev 4
4
Figure 6. Typical Output Waveform
(
8, 1.1GHz Input Frequency, VCC = 5.0, TA = 25
C, Output Loaded With 8pF)
880mV
36.6ns
86.6ns
5.88V
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