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GENERAL DESCRIPTION

The 74HC/HCT5555 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

FEATURES

? Positive and negative edge triggered

? Retriggerable or non-retriggerable

? Programmable delay

minimum: 100 ns

maximum: depends on input

frequency and division ratio

? Divide-by range of 2 to 224

? Direct reset terminates output

pulse

? Very low power consumption in

triggered start mode

? 3 oscillator operating modes:

– RC oscillator

– Crystal oscillator

– External oscillator

? Device is unaffected by variations

in temperature and VCC when using

an external oscillator

? Automatic power-ON reset

? Schmitt trigger action on both

trigger inputs

? Direct drive for a power transistor

? Low power consumption in active

mode with respect to TTL type

timers

? High precision due to digital timing

? Output capability: 20 mA

? ICC category: MSI.

APPLICATIONS

? Motor control

? Attic fan timers

? Delay circuits

? Automotive applications

? Precision timing

? Domestic appliances.