TLF5009

June 1986

DS8627DS8628 130225 MHz Low Power Prescalers

General Description

The DS8627 and DS8628 are low power fixed ratio prescal-

ers which divide by 24 and 20 respectively The inputs can

be driven either single or double-ended and they are buff-

ered providing 40100 mVrms input sensitivity The output

provided is open-collector and is capable of interfacing with

TTL and CMOS

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

separately 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 -3) 225 mHz (-2 std)

Y

Low power 10 mA (-4 -2) 7 mA (-3 std)

Y

Input sensitivity 100 mVrms (-4 -3) 40 mVrms (-2 std)

Logic and Connection Diagrams

TLF5009 – 1

TLF5009 – 2

Dual-In-Line Package

TLF5009 – 3

Top View

Order Number DS8627N or DS8628N (-4 -3 -2)

See NS Package Number N08E

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A