DS8627 Datasheet, PDF (1/4 Pages) National Semiconductor (TI) – 130/225 MHz Low Power Prescalers

June 1986
DS8627 DS8628 130 225 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 40 100 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
DS8627 (d 24)
DS8628 (d 20)
TL F 5009 – 1
Dual-In-Line Package
TL F 5009 – 2
TL F 5009 – 3
Top View
Order Number DS8627N or DS8628N (-4 -3 -2)
See NS Package Number N08E
C1995 National Semiconductor Corporation TL F 5009
RRD-B30M115 Printed in U S A