MC12038A Datasheet, PDF (1/5 Pages) Motorola, Inc – MECL PLL COMPONENTS ÷127/128, ÷255/256 DUAL MODULUS PRESCALER

Order this document by MC12038A/D
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
Operating Temperature Range
Storage Temperature Range
Modulus Control Input, Pin 6
VCC
–0.5 to 7.0
Vdc
TA
–40 to 85
°C
Tstg
–65 to 150
°C
MC
–0.5 to 6.5
Vdc
NOTE: ESD data available upon request.
MC12038A
MECL PLL COMPONENTS
÷127/128, ÷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
VCC 2
SW 3
OUT ⁴
8 IN
7 _NC
6 MC
5 Gnd
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC12038AD
TA = – 40° to +85°C
MC12038AP
SO–8
Plastic
© Motorola, Inc. 1997
Rev 2