MAX6818 Datasheet

• Switch Debouncer Integration Simplifies System Interface to Mechanical Switches
  • Single-Supply Operation from +2.7V to +5.5V
  • No External Components Required
  • Octal (MAX6818) Versions Available
  • 6µA Supply Current
• Built-In Protection Circuitry Improves System Reliability
  • Inputs Can Exceed Power Supplies up to ±25V
  • ESD Protection for Input Pins
    • ±15kV—Human Body Model
    • ±8kV—IEC 1000-4-2, Contact Discharge
    • ±15kV—IEC 1000-4-2, Air-Gap Discharge
• Octal Version (MAX6818) Provides Direct Data Bus Interface
  • Three-State Outputs for Directly Interfacing to µP (MAX6818)
  • Switch Change-of-State Output Simplifies Polling and Interrupts (MAX6818)
  • Pin-Compatible with 'LS573 (MAX6818)

• µP Switch Interfacing
• Industrial Instruments
• Membrane Keypads
• PC-Based Instruments
• Portable Instrumentation

The MAX6818 are octal switch debouncers that provide clean interfacing of mechanical switches to digital systems. They accept one or more bouncing inputs from a mechanical switch and produce a clean digital output after a short, preset qualification delay. Both the switch opening bounce and the switch closing bounce are removed. Robust switch inputs handle ±25V levels and are ±15kV ESD-protected for use in harsh industrial environments. They feature single-supply operation from +2.7V to +5.5V. Undervoltage lockout circuitry ensures the output is in the correct state upon power-up.

The MAX6818 octal switch debouncer is designed for data-bus interfacing. The MAX6818 monitors switches and provides a switch change-of-state output (active-low CH), simplifying microprocessor (µP) polling and interrupts. Additionally, the MAX6818 has three-state outputs controlled by an enable (active-low EN) pin, and is pin-compatible with the LS573 octal latch (except for the active-low CH pin), allowing easy interfacing to a digital data bus.