DS8628 Datasheet | National Semiconductor

Description The DS8627 and DS8628 are low power fixed ratio prescalers which divide by 24 and 20 respectively The inputs can be driven either single or double-ended and they are buffered providing 40 100 m Vrms 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 munications bands to prescale 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 Input frequency 130 MHz (-4 -3) 225 m Hz (-2 std) Low power 10 m A (-4 -2) 7 m A (-3 std) Input sensitivity 100 m Vrms (-4 -3) 40 m Vrms (-2 std) Logic and Connection Diagrams DS8627 ( d 24) TL F 5009 - 1 DS8628 ( d 20) TL F 5009 - 2 Dual-In-Line Package 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 Absolute Maximum Ratings (Note 1) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications VCC Supply Voltage VIN Input Voltage 7V k VCC Open-Collector Output Voltage Operating Free Air Temperature Range Storage Temperature Range 7V b 30 C to a 70 C b 65 C to a 150 C Remended Operating Conditions Symbol Parameter Conditions DS8627-4 DS8628-4 Min VCC f MAX VIN VSLW IOL Supply Voltage Toggle Frequency Input Signal Amplitude Slew Rate Low Level Output Current VIN e 100 m Vrms 45 20 100 20 3 Max 55 130 300 DS8627-3 DS8628-3 Min 45 20 100 20 3 Max 55 130 300 DS8627-2 DS8628-2 Min 45 20 40 20 Max 55 225 300 DS8627 DS8628 Min 45 20 40 20 3 Max 55 225 300 V MHz m Vrms V ms m A Units DC Electrical Characteristics (Notes 2 and 3) Symbol Parameter Conditions DS8627-4 DS8628-4 Min...