Programmable Timer Single 16-Pin PDIP Bulk

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. The 74HC/HCT5555 are precision programmable delay timers which consist of: 24-stage binary counter integrated oscillator (using external timing components) retriggerable/non-retriggerable monostable automatic power-ON reset output control logic oscillator control logic overriding asynchronous master reset (MR).

• 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.