MC12038A

Order this document by MC12038A/D

SEMICONDUCTOR

TECHNICAL DATA

MECL PLL COMPONENTS

÷127/128, ÷255/256

DUAL MODULUS PRESCALER

P SUFFIX

PLASTIC PACKAGE

CASE 626

PIN CONNECTIONS

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

8

1

1

8

IN

(Top View)

8

IN

VCC

SW

OUT

NC

MC

Gnd

7

6

5

1

2

3

4

Device

Operating

Temperature Range

Package

ORDERING INFORMATION

MC12038AD

MC12038AP

TA = – 40° to +85°C

SO–8

Plastic

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.

CMOS and TTL

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

VCC

–0.5 to 7.0

Vdc

Operating Temperature Range

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

NOTE:

ESD data available upon request.

© Motorola, Inc. 1997

Rev 2