Order this document by MC12038A/D
MC12038A
1.1 GHz Low Power Dual
Modulus Prescaler
The MC12038A 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 1.1 GHz in programmable frequency steps.
A Divide Ratio Control (SW) permits selection of a 127/128 or 255/256 divide ratio as desired.
The Modulus Control (MC) selects the proper divide number after SW has been biased to select the desired divide ratio.
•1.1 GHz Toggle Frequency
•Supply Voltage of 4.5 to 5.5 V
•Low±Power 4.8 mA Typical
•Operating Temperature Range of ±40 to 85°C
•Short Setup Time (tset) 16ns Maximum @ 1.1 GHz
•Modulus Control Input Level Is Compatible With Standard CMOS and TTL
•On±Chip Output Termination
FUNCTIONAL TABLE
SW |
MC |
Divide Ratio |
|
|
|
H |
H |
127 |
|
|
|
H |
L |
128 |
|
|
|
L |
H |
255 |
|
|
|
L |
L |
256 |
|
|
|
NOTES: 1. SW: H = VCC, L = Open. A logic L can also be applied by grounding this pin, but this is not recommended due to increased power consumption.
2. MC: H = 2.0 V to VCC, L = GND to 0.8 V.
DESIGN GUIDE
Criteria |
Value |
Unit |
|
|
|
Internal Gate Count* |
67 |
ea |
|
|
|
Internal Gate Propagation Delay |
200 |
ps |
|
|
|
Internal Gate Power Dissipation |
0.75 |
mW |
|
|
|
Speed Power Product |
0.15 |
pJ |
|
|
|
NOTE: * Equivalent to a two±input NAND gate |
|
|
MAXIMUM RATINGS |
|
|
Characteristic |
Symbol |
Range |
Unit |
|
|
|
|
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 |
Modulus Control Input, Pin 6 |
MC |
±0.5 to 6.5 |
Vdc |
|
|
|
|
NOTE: ESD data available upon request.
MECL PLL COMPONENTS127/128, 255/256
DUAL MODULUS 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 |
|
|
|
|
SW 3 |
6 |
MC |
||
OUT |
4 |
5 |
Gnd |
|
|
|
(Top View) |
|
|
ORDERING INFORMATION
|
|
Operating |
|
|
Device |
Temperature Range |
Package |
||
|
|
|
|
|
MC12038AD |
TA = ± 40° to +85°C |
SO±8 |
||
|
|
|
||
MC12038AP |
Plastic |
|||
|
||||
|
|
|
|
|
Motorola, Inc. 1997 |
Rev 2 |
|
|
|
|
|
|
|
|
|
|
MC12038A |
|
|
|
|
ELECTRICAL CHARACTERISTICS (VCC = 4.5 to 5.5V; TA = ±40 to 85°C, unless otherwise noted.) |
|
|
|
|||||||||||
|
|
|
|
Characteristic |
|
|
|
Symbol |
Min |
Typ |
Max |
Unit |
||
Toggle Frequency (Sine Wave Input) |
|
|
|
|
ft |
0.1 |
1.4 |
1.1 |
GHz |
|||||
Supply Current Output Unloaded (Pin 2) at 5.0 Vdc |
|
|
ICC |
± |
4.8 |
6.5 |
mA |
|||||||
Modulus Control Input High (MC) |
|
|
|
|
VIH1 |
2.0 |
± |
VCC |
V |
|||||
Modulus Control Input Low (MC) |
|
|
|
|
VIL1 |
± |
± |
0.8 |
V |
|||||
Divide Ratio Control Input High (SW) |
|
|
|
|
VIH2 |
VCC |
VCC |
VCC |
Vdc |
|||||
Divide Ratio Control Input Low (SW) |
|
|
|
|
VIL2 |
Open |
Open |
Open |
± |
|||||
Output Voltage Swing (CL = 8.0 pF) |
|
|
|
|
Vout |
1.0 |
1.6 |
± |
Vpp |
|||||
Modulus Setup Time MC to Out |
|
|
|
|
|
tset |
± |
11 |
16 |
ns |
||||
Input Voltage Sensitivity 250±1100 MHz |
|
|
|
|
Vin(min) |
100 |
± |
1500 |
mVpp |
|||||
|
|
|
|
100±250 MHz |
|
|
|
|
|
400 |
± |
1500 |
|
|
|
|
Figure 1. Logic Diagram (MC12038A) |
|
|
Figure 2. Modulus Setup Time |
|
||||||||
|
|
D |
Q |
D |
Q |
D |
Q |
|
|
|
Prop. Delay |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
A |
|
B |
|
C |
|
|
|
|
|
|
In |
|
|
|
|
|
|
C |
QB |
|
|
|
|
|
|
|
In |
|
C |
QB |
C |
QB |
M |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
In |
|
|
|
|
|
|
|
|
|
|
|
|
|
Out |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
MC |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
MC Setup |
MC |
D |
Q |
D |
QB |
D |
Q |
D |
QB |
D |
QB |
|
|
|
|
|
|
D |
E |
F |
|
|
G |
H |
|
|
|
|
MC Release |
|
|
C |
QB |
C |
Q |
C |
QB |
C |
Q |
C S |
Q |
Out |
|
|
|
|
|
|
|
|
|||||||||||
|
|
|
|
|
||||||||||
|
|
|
|
|
|
|
|
|
|
|
Modulus setup time MC to out is the MC |
|
||
|
|
|
|
|
|
|
SW |
|
|
|
setup or MC release plus the prop delay. |
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Figure 3. Typical Output Waveforms
500 m ≈ |
20 ns |
( 128, 1.1 GHz Input Frequency, VCC = 5.0 V, TA = 25°C, Output Loaded) |
|
2 |
MOTOROLA RF/IF DEVICE DATA |
Loading...