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
•
•
•
•
•
•
MECL PLL COMPONENTS
÷127/128, ÷255/256
DUAL MODULUS PRESCALER
SEMICONDUCTOR
TECHNICAL DATA
Supply Voltage of 4.5 to 5.5 V
Low–Power 4.8 mA Typical
Operating Temperature Range of –40 to 85°C
8
Short Setup Time (tset) 16ns Maximum @ 1.1 GHz
1
Modulus Control Input Level Is Compatible With Standard
CMOS and TTL
On–Chip Output Termination
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
NOT RECOMMENDED FOR NEW DESIGN
DEVICE TO BE PHASED OUT.
No replacement available.
FUNCTIONAL TABLE
SW
MC
Divide Ratio
H
H
127
H
L
128
L
H
255
L
L
256
PIN CONNECTIONS
IN
VCC
SW
OUT
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.
1
8
2
7
3
6
4
5
IN
NC
MC
Gnd
(Top View)
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:
ORDERING INFORMATION
Device
MC12038AD
Operating
Temperature Range
Package
TA = – 40 to 85°C
SO–8
* Equivalent to a two–input NAND gate
MAXIMUM RATINGS
Characteristic
Power Supply Voltage, Pin 2
Symbol
Range
Unit
VCC
–0.5 to 7.0
Vdc
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
Operating Temperature Range
NOTE:
ESD data available upon request.
MC12038A
4.2–8
MOTOROLA WIRELESS RF, IF AND TRANSMITTER DEVICE DATA
