General Description

The MAX6816/MAX6817/MAX6818 are single, dual, and 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 single MAX6816 and dual MAX6817 are offered in SOT packages and require no external components.

Their low supply current makes them ideal for use in portable equipment.

The MAX6818 octal switch debouncer is designed for data-bus interfacing.

The MAX6818 monitors switches and provides a switch change-of-state output (CH),

simplifying microprocessor (µP) polling and interrupts.

Additionally, the MAX6818 has three-state outputs controlled by an enable (EN) pin, and is pin-compatiblewith the LS573 octal latch (except for the CHpin),

allowing easy interfacing to a digital data bus.

Features

♦Robust 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

♦Small SOT Packages (4 and 6 pins)

♦Single-Supply Operation from +2.7V to +5.5V

♦Single (MAX6816), Dual (MAX6817), and Octal

(MAX6818) Versions Available

♦No External Components Required

♦6µA Supply Current

♦Three-State Outputs for Directly Interfacing

Switches to µP Data Bus (MAX6818)

♦Switch Change-of-State Output Simplifies

Polling and Interrupts (MAX6818)

♦Pin-Compatible with ’LS573 (MAX6818)