MECL PLL COMPONENTS 64/65 / 128/129 DUAL MODULUS PRESCALER - Motorola
Description
Order this document by MC12028A/D
MC12028A 1.
1 GHz Dual Modulus Prescaler
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.
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.
NOTE: The “B” Version Is Not Recommended for New Designs
MC12028B
MECL PLL COMPONENTS ÷64/65, ÷128/129 DUAL MODULUS PRESCALER
SEMICONDUCTOR TECHNICAL DATA
• • • • •
1.
1 GHz Toggle Frequency MC12028A for Positive Edge Triggered Synthesizers 6.
5 mA Maximum, –40 to 85°C, VCC = 5.
5 Vdc Modulus Control Input Level Is Compatible With Standard CMOS and TTL Low–Power 4.
0 mA Typical
8 1
D SUFFIX PLASTIC PACKAGE CASE 751 (SO–8)
FUNCTIONAL TABLE
SW H H L L MC H L H L Divide Ratio 32 33 64 65
8 1
NOTES: 1.
SW: H = VCC, L = Open.
A logic L can also be applied by grouunding this pin, but this is not recommended due to increased power soncumption.
2.
MC: H = 2.
0 V to VCC, L = GND to 0.
8 V.
DESIGN GUIDE
Criteria Internal Gate Count* Internal Gate Propagation Delay Internal Gate Power Dissipation Speed Power Product
NOTE: * Equivalent to a two–input NAND gate
P SUFFIX PLASTIC PACKAGE CASE 626
Value 67 200 0.
75 0.
15
Unit ea ps mW pJ IN VCC SW OUT Unit Vdc °C °C Vdc Device MC12028AD MC12028AP MC12028BD MC120228BP
© Motorola, Inc.
1997
1 2 3 4 8 7 6 5
PIN CONNECTIONS
MAXIMUM RATINGS
Characteristic Power Supply Voltage, Pin 2 Operating Temperature Range Storage Temperature Range Modulus Control Input, Pin 6
NOTE: ESD data available upon request.
IN NC MC Gnd
Symbol VCC TA Tstg MC
Range –0.
5 to 7.
0 –40 to 85 –65 to 150 –0.
5 to 6.
5
(Top View)
ORDERING INFORMATION
Operating T...
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