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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-compatible

with the LS573 octal latch (except for the CH pin),

allowing easy interfacing to a digital data bus.

Applications

● µP Switch Interfacing

● Industrial Instruments

● PC-Based Instruments

● Portable Instruments

● Membrane Keypads

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)

Note: There is a minimum order increment of 2500 pieces for

SOT packages.

Devices are available in both leaded and lead(Pb)-free/RoHS-

compliant packaging. Specify lead-free by replacing “-T” with

“+T” when ordering.

PART TEMP RANGE

PIN-

PACKAGE

SOT

TOP MARK

MAX6816EUS-T -40°C to +125°C 4 SOT143 KABA

MAX6817EUT-T -40°C to +125°C 6 SOT23-6 AAAU

MAX6818EAP -40°C to +125°C 20 SSOP —

OUTIN

GND

MAX6816

SOT143

TOP VIEW

MECHANICAL

SWITCH

RESET

GND

DEBOUNCED

OUTPUT

µP

0.1µF

OUT

MAX6816

MAX6816/MAX6817/

MAX6818

±15kV ESD-Protected, Single/Dual/Octal,

CMOS Switch Debouncers

19-4770; Rev 4; 7/14

Pin Configurations continued at end of data sheet.

Pin Congurations

Ordering Information

Typical Operating Circuit

Summary of content (8 pages)

PAGE 1
MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers 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.
PAGE 2
MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers Absolute Maximum Ratings Voltage (with respect to GND) VCC.......................................................................-0.3V to +6V IN_ (Switch Inputs)..............................................-30V to +30V EN.........................................................................-0.3V to +6V OUT_, CH.............................................. -0.3V to (VCC + 0.
PAGE 3
MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE VCC = 3V 1 0V VCC = 5V -40 -25 -10 5 20 35 50 65 80 95 110 125 MAX6816 TOC03 -5V 0V VCC = 5V 10ms/div 10ms/div TEMPERATURE (C) OUTPUT LOGIC LEVEL vs. SUPPLY VOLTAGE LOGIC THRESHOLD (V) 5 5 4 3 2 MAX6816 toc05 VOH, ISOURCE = 0.4mA MAX6818 EN INPUT LOGIC THRESHOLD vs.
PAGE 4
MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers Pin Description PIN MAX6816 MAX6817 MAX6818 1 2 10 NAME FUNCTION GND Ground 2 — — IN — 1, 3 — IN1, IN2 Switch Input Switch Inputs — — 2–9 IN1–IN8 Switch Inputs 3 — — OUT CMOS Debounced Output — 4, 6 — OUT2, OUT1 CMOS Debounced Outputs — — 12–19 OUT8–OUT1 CMOS Debounced Outputs 4 5 20 VCC — — 1 EN Active-Low, Three-State Enable Input for outputs. Resets CH.
PAGE 5
MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers EN tDP tEN 1/2 VCC IN1 tPE OUT1–OUT8 1/2 VCC OUT1 tPE OUT1–OUT8 IN2 tPC CH 1/2 VCC tPD OUT NORMALLY LOW 1/2 VCC VOL + 0.5V OUT NORMALLY HIGH VOH - 0.5V tPD 1/2 VCC OUT2 Figure 4. MAX6818 μP-Interface Timing Diagram CH +VCC SW1 Figure 2. Input Characteristics IN1 EN I/O CH IRQ µP MAX6818 20V IN (20V/div) +VCC 0.
PAGE 6
MAX6816/MAX6817/ MAX6818 RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers RC 50MΩ to 100MΩ RD 1500Ω DISCHARGE RESISTANCE CHARGE CURRENT LIMIT RESISTOR DEVICE UNDER TEST STORAGE CAPACITOR Figure 6a. Human Body ESD Test Model HIGHVOLTAGE DC SOURCE Cs 150pF RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 7a.
PAGE 7
MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers meets Level 4 (the highest level) of IEC 1000-4-2, with-out the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model.
PAGE 8
MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers Revision History REVISION NUMBER REVISION DATE 0 7/98 Initial release 3 8/10 Updated Ordering Information, Electrical Characteristics, Typical Operating Characteristics, and the Undervoltage Lockout section.