TLF5240

July 1992

DS8615DS8616 130225 MHz

Low Power Dual Modulus Prescalers

General Description

The DS8615 series products are low power dual modulus

prescalers which divide by 3233 and 4041 respectively

The modulus control (MC) input selects division by N when

level The clock inputs are buffered providing 40100

mVrms input sensitivity The two outputs provide the user

the option to wire either a totem-pole or open-collector out-

put structure Additionally the user can wire a resistor be-

tween the two output pins to minimize edge transition emis-

sions The outputs are designed to drive positive edge trig-

gered PLLs These products can be operated from either an

source

The device can be used in phase-locked loop applications

such as FM radio or other communications bands to pre-

scale the input frequency down to a more usable level A

digital frequency display system can also be derived sepa-

rately or in conjunction with a phase-locked loop and it can

extend the useful range of many inexpensive frequency

counters to 225 MHz

Features

Y

Input frequency 130 MHz (-4) 225 MHz (-2)

Y

Low power 10 mA (-4 -2)

Y

Input sensitivity 100 mVrms (-4) 40 mVrms (-2)

Y

Pin compatible with Motorola MC12015-16 prescalers

Y

Unregulatedregulated power supply option

Logic and Connection Diagrams

TLF5240 1

Dual-In-Line Package

TLF5240 2

Top View

Order Number DS8615N or DS8616N (-4 -2)

See NS Package Number N08E

C1995 National Semiconductor Corporation

RRD B30M105Printed in U S A