MC12036A Datasheet, PDF (1/4 Pages) Motorola, Inc – MECL PLL COMPONENTS ÷64/65, ÷128/129 DUAL MODULUS PRESCALER WITH STAND–BY MODE

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
1.1GHz Dual Modulus Prescaler
With Stand-By Mode
Consider MC12053 for New Designs
MC12036A
MC12036B
The MC12036 is a 1.1GHz ÷64/65, ÷128/129 dual modulus prescaler
used in phase–locked loop (PLL) applications. Stand–By mode is
featured to reduce current drain to 0.5mA typical when the standby pin
(SB) is switched LOW, disabling the prescaler. On–chip output
termination provides sufficient output current to drive a 12pF (typical) high
impedance load.
The MC12036A 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 MC12036B can be used with CMOS synthesizers
requiring negative edges to trigger internal counters.
A Divide Ratio Control (SW) permits selection of a 64/65 or 128/129
divide ratio as desired.
The Modulus Control (MC) selects the proper divide number after SW
has been biased to select the desired divide ratio.
• 1.1GHz Toggle Frequency
• Low Power 4.0mA Typical
• Stand–By Mode
• On–Chip Output Termination
• Supply Voltage 4.5V to 5.5V
• Operating Temperature Range of –40°C to +85°C
• Short Setup Time (tset ) 16ns Maximum @ 1.1GHz
• Modulus Control Input Level is Compatible With Standard CMOS and
TTL
Pinout: 8–Lead Plastic (Top View)
IN SB MC GND
8765
MECL PLL COMPONENTS
÷64/65, ÷128/129
DUAL MODULUS PRESCALER
WITH STAND–BY MODE
P SUFFIX
8–LEAD PLASTIC PACKAGE
CASE 626–05
D SUFFIX
8–LEAD PLASTIC SOIC PACKAGE
CASE 751–05
FUNCTION TABLE
SW
MC
Divide Ratio
H
H
64
H
L
65
L
H
128
L
L
129
Note: SW: H = VCC, L = OPEN
MC: H = 2.0V to VCC, L = GND to 0.8V
1234
IN VCC SW OUT
Design Criteria
Internal Gate Count *
Internal Gate Propagation Delay
Internal Gate Power Dissipation
Speed Power Product
*Equivalent to a two–input NAND gate.
Value
67
200
0.75
0.15
Unit
ea
ps
mW
pJ
1/97
© Motorola, Inc. 1997
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