Order this document by MC12028A/D
The MC12028A 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.
The MC12028B can be used with CMOS synthesizers requiring negative
edges to trigger internal counters.
MECL PLL COMPONENTS
÷64/65, ÷128/129
DUAL MODULUS PRESCALER
A Divide Ratio Control (SW) permits selection of a 32/33 or 64/65 divide
ratio as desired.
The Modulus Control (MC) selects the proper divide number after SW has
been biased to select the desired divide ratio.
SEMICONDUCTOR
TECHNICAL DATA
NOTE: The “B” Version Is Not Recommended for New Designs
• 1.1 GHz Toggle Frequency
8
• MC12028A for Positive Edge Triggered Synthesizers
1
• 6.5 mA Maximum, –40 to 85°C, V
= 5.5 Vdc
CC
D SUFFIX
PLASTIC PACKAGE
CASE 751
• Modulus Control Input Level Is Compatible With
Standard CMOS and TTL
• Low–Power 4.0 mA Typical
(SO–8)
FUNCTIONAL TABLE
SW
H
MC
H
Divide Ratio
32
33
64
65
H
L
L
H
8
1
L
L
NOTES: 1. SW: H = V , L = Open. A logic L can also be applied by grouunding this pin,
CC
but this is not recommended due to increased power soncumption.
P SUFFIX
PLASTIC PACKAGE
CASE 626
2. MC: H = 2.0 V to V , L = GND to 0.8 V.
CC
DESIGN GUIDE
Criteria
Internal Gate Count*
Value
67
Unit
ea
Internal Gate Propagation Delay
Internal Gate Power Dissipation
200
ps
PIN CONNECTIONS
0.75
0.15
mW
pJ
Speed Power Product
1
2
3
4
8
7
6
5
IN
IN
NOTE: * Equivalent to a two–input NAND gate
V
NC
MC
CC
SW
MAXIMUM RATINGS
Gnd
OUT
Characteristic
Symbol
Range
Unit
Vdc
°C
(Top View)
Power Supply Voltage, Pin 2
Operating Temperature Range
Storage Temperature Range
Modulus Control Input, Pin 6
NOTE: ESD data available upon request.
V
CC
–0.5 to 7.0
–40 to 85
–65 to 150
–0.5 to 6.5
T
A
T
stg
°C
ORDERING INFORMATION
Operating
MC
Vdc
Temp Range
Device
Package
MC12028AD
MC12028AP
MC12028BD
MC120228BP
SO–8
Plastic
SO–8
Plastic
T
A
=–40° to +85°C
Motorola, Inc. 1997
Rev 3