±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MA

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±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MA

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±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers
MAX6816/MAX6817/MAX6818 single, dual, octal switch debouncers that provide clean interfacing mechanical switches digital systems. They accept more bouncing inputs from mechanical switch produce clean digital output after short, preset qualification delay. Both switch opening bounce switch closing bounce removed. Robust switch inputs handle ±25V levels ±15kV ESDprotected harsh industrial environments. They feature single-supply operation from +2.7V +5.5V. Undervoltage lockout circuitry ensures output correct state upon power-up. single MAX6816 dual MAX6817 offered packages require external components. Their supply current makes them ideal portable equipment. MAX6818 octal switch debouncer designed data-bus interfacing. MAX6818 monitors switches provides switch change-of-state output (CH), simplifying microprocessor (µP) polling interrupts. Additionally, MAX6818 three-state outputs controlled enable (EN) pin, pin-compatible with `LS573 octal latch (except pin), allowing easy interfacing digital data bus.
Features
Robust Inputs Exceed Power Supplies ±25V Protection Input Pins ±15kV-Human Body Model ±8kV-IEC 1000-4-2, Contact Discharge ±15kV-IEC 1000-4-2, Air-Gap Discharge Small Packages pins) Single-Supply Operation from +2.7V +5.5V Single (MAX6816), Dual (MAX6817), Octal (MAX6818) Versions Available External Components Required Supply Current Three-State Outputs Directly Interfacing Switches Data (MAX6818) Switch Change-of-State Output Simplifies Polling Interrupts (MAX6818) Pin-Compatible with 'LS573 (MAX6818)
MAX6816/MAX6817/MAX6818
Ordering Information
PART MAX6816EUS-T TEMP. RANGE -40°C +85°C PINSOT PACKAGE MARK SOT143 KABA
Applications
Switch Interfacing Industrial Instruments PC-Based Instruments Portable Instruments Automotive Applications Membrane Keypads
MAX6817EUT-T -40°C +85°C SOT23-6 AAAU MAX6818EAP -40°C +85°C SSOP Note: There minimum order increment 2500 pieces packages.
Configurations
VIEW
Typical Operating Circuit
MECHANICAL SWITCH
MAX6816
0.1µF
MAX6816
DEBOUNCED OUTPUT
RESET
SOT143
Configurations continued data sheet.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 1-800-835-8769.
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MAX6816/MAX6817/MAX6818
ABSOLUTE MAXIMUM RATINGS
Voltage (with respect GND) .-0.3V (Switch Inputs) .-30V +30V EN.-0.3V OUT_, .-0.3V (VCC 0.3V) Short-Circuit Duration (One Outputs GND).Continuous Continuous Power Dissipation +70°C) 4-Pin SOT143 (derate 4.0mW/°C above +70°C).320mW 6-Pin SOT23 (derate 8.7mW/°C above +70°C).691mW 20-Pin SSOP (derate 8.0mW/°C above +70°C) .640mW Operating Temperature Range .-40°C +85°C Storage Temperature Range .-65°C +160°C Lead Temperature (soldering, 10sec) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC +2.7V +5.5V, -40°C +85°C, unless otherwise noted. Typical values +5V, +25°C.) (Note PARAMETER Operating Voltage Range Supply Current Debounce Duration SYMBOL Input Threshold Input Hysteresis Input Pull-Up Resistance Input Current Input Voltage Range Undervoltage-Lockout Threshold OUT_, Output Voltage Pulse Width Threshold Input Current Active Propagation Delay High Three-State Propagation Delay High Propagation Delay OUT_ Three-State Leakage Current CHARACTERISTICS IEC1000-4-2 Discharge Protection IEC1000-4-2 Contact Discharge Human Body Model 10k, 100pF 15pF 10k, 50pF VOUT 2.7V ISINK 1.6mA ISOURCE 0.4mA ±15V 2.7V IOUT MAX6818 MAX6816/MAX6817 CONDITIONS UNITS
Note MAX6816 MAX6817 production testing done +25°C; over-temperature limits guaranteed design.
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers
Typical Operating Characteristics
+25°C, unless otherwise noted.)
MAX6816/MAX6817/MAX6818
SUPPLY CURRENT TEMPERATURE
SUPPLY CURRENT (µA)
MAX6816 TOC01
DEBOUNCE CLOSING SWITCH
MAX6816 TOC02
DEBOUNCE OPENING SWITCH
MAX6816 TOC03
(5V/div)
(2V/div)
(5V/div) 10ms/div
(2V/div)
10ms/div
TEMPERATURE (°C)
OUTPUT LOGIC LEVEL SUPPLY VOLTAGE
VOH, ISOURCE 0.4mA OUTPUT LOGIC LEVEL VOL, ISINK 1.6mA SUPPLY VOLTAGE
MAX6816 toc04
MAX6818 INPUT LOGIC THRESHOLD SUPPLY VOLTAGE
MAX6816 toc05
LOGIC THRESHOLD
SUPPLY VOLTAGE
DEBOUNCE DELAY PERIOD TEMPERATURE
MAX6816 toc06
UNDERVOLTAGE LOCKOUT TEMPERATURE
MAX6816 toc07
DEBOUNCE DELAY PERIOD (ms)
UNDERVOLTAGE LOCKOUT
TEMPERATURE (°C)
TEMPERATURE (°C)
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MAX6816/MAX6817/MAX6818
Description
MAX6816 MAX6817 MAX6818 12-19 NAME IN1, IN1-IN8 OUT2, OUT1 OUT8-OUT1 Ground Switch Input Switch Inputs Switch Inputs CMOS Debounced Output CMOS Debounced Outputs CMOS Debounced Outputs +2.7V +5.5V Supply Voltage Active-Low, Three-State Enable Input outputs. Resets "always enable" outputs. Change-of-State Output. Goes switch input change state. Resets Leave unconnected used. FUNCTION
PROTECTION OSC. COUNTER
LOAD
UNDERVOLTAGE LOCKOUT
MAX6816 MAX6817 MAX6818
Figure Block Diagram
_Detailed Description
Theory Operation
MAX6816/MAX6817/MAX6818 designed eliminate extraneous level changes that result from interfacing with mechanical switches (switch bounce). Virtually mechanical switches bounce upon opening closing. These switch debouncers remove bounce when switch opens closes requiring that sequentially clocked inputs remain same state number sampling periods. output does change until input stable duration 40ms. circuit block diagram (Figure shows functional blocks consisting on-chip oscillator, counter, exclusive-NOR gate, flip-flop. When
input does equal output, XNOR gate issues counter reset. When switch input state stable full qualification period, counter clocks flip-flop, updating output. Figure shows typical opening closing switch debounce operation. MAX6818, change output (CH) updated simultaneously with switch outputs.
Undervoltage Lockout
undervoltage lockout circuitry ensures that outputs correct state power-up. While supply voltage below undervoltage threshold (typically 1.9V), debounce circuitry remains transparent. Switch states present logic outputs without delay.
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MAX6816/MAX6817/MAX6818
OUT1-OUT8
OUT1
NORMALLY
0.5V
OUT1-OUT8
NORMALLY
HIGH
0.5V
OUT2
Figure MAX6818 µP-Interface Timing Diagram
+VCC MAX6818 ONLY 0.1µF +VCC
Figure Input Characteristics
(20V/div) -20V (2V/div) OUT8
MAX6818
OUT1
Figure MAX6818 Typical Interfacing Circuit
20ms/div
Figure Switch Input ±25V Fault Tolerance
Robust Switch Inputs
switch inputs MAX6816/MAX6817/MAX6818 have overvoltage clamping diodes protect against damaging fault conditions. Switch input voltages safely swing ±25V ground (Figure Proprietary ESD-protection structures protect against high encountered harsh industrial environments, membrane keypads, portable applications. They designed withstand ±15kV IEC1000-4-2 Discharge Test ±8kV IEC1000-4-2 Contact Discharge Test. Since there (typical) pull-up resistors connected each input, driving input -25V will draw
approximately 0.5mA eight inputs) from supply. Driving input +25V will cause approximately 0.32mA current 2.6mA eight inputs) flow back into supply. total system supply current less than current flowing back into supply, will rise above normal levels. some low-current systems, zener diode required.
±15kV Protection
with Maxim devices, ESD-protection structures incorporated pins protect against electrostatic discharges encountered during handling assembly. MAX6816/MAX6817/MAX6818 have extra protection against static electricity. Maxim's engineers have developed state-of-the-art structures protect against ±15kV switch inputs without
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MAX6816/MAX6817/MAX6818
CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE SOURCE 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE SOURCE 100M CHARGE CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE DEVICE UNDER TEST
100pF
STORAGE CAPACITOR
150pF
STORAGE CAPACITOR
Figure Human Body Test Model
Figure IEC1000-4-2 Test Model
100% AMPERES PEAK 36.8% TIME CURRENT WAVEFORM PEAK-TO-PEAK RINGING (NOT DRAWN SCALE) 100%
Figure Human Body Current Waveform
0.7ns 30ns 60ns
damage. structures withstand high states: normal operation, shutdown, powered down. After event, MAX6816/MAX6817/ MAX6818 keep working without latchup, whereas other solutions latch must powered down remove latchup. protection tested various ways; these products characterized protection following limits: ±15kV using Human Body Model ±8kV using Contact-Discharge method specified IEC1000-4-2 ±15kV using IEC1000-4-2's Air-Gap method.
Figure IEC1000-4-2 Generator Current Waveform
Human Body Model Figure shows Human Body Model Figure shows current waveform generates when discharged into impedance. This model consists 100pF capacitor charged voltage interest, which then discharged into test device through 1.5k resistor. IEC1000-4-2 IEC1000-4-2 standard covers testing performance finished equipment; does specifically refer integrated circuits. MAX6816/ MAX6817/MAX6818 help design equipment that
Test Conditions performance depends variety conditions. Contact Maxim reliability report that documents test setup, test methodology, test results.
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers
meets Level (the highest level) IEC1000-4-2, without need additional ESD-protection components. major difference between tests done using Human Body Model IEC1000-4-2 higher peak current IEC1000-4-2, because series resistance lower IEC1000-4-2 model. Hence, withstand voltage measured IEC1000-4-2 generally lower than that measured using Human Body Model. Figure shows IEC1000-4-2 model Figure shows current waveform 8kV, IEC1000-4-2, Level Contact-Discharge test. Air-Gap test involves approaching device with charged probe. Contact-Discharge method connects probe device before probe energized.
Machine Model Machine Model tests pins using 200pF storage capacitor zero discharge resistance. objective emulate stress caused contact that occurs with handling assembly during manufacturing.
MAX6816/MAX6817/MAX6818
MAX6818 Interfacing
MAX6818 output enable (EN) input that allows switch outputs three-stated data until polled Also, state changes switch inputs detected, output (CH) goes after debounce period signal Figure shows timing diagram enabling outputs reading data. output enable used, "always enable'' switch outputs. low, always high. change state required, leave unconnected.
Configurations (continued)
VIEW
OUT1 OUT2 OUT1 OUT2 OUT3
MAX6817
MAX6818
OUT4 OUT5 OUT6 OUT7 OUT8
SOT23-6
SSOP
_Chip Information
MAX6816 TRANSISTOR COUNT: MAX6817 TRANSISTOR COUNT: MAX6818 TRANSISTOR COUNT: 2130 SUBSTRATE CONNECTED
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MAX6816/MAX6817/MAX6818
Package Information
SOT1434.EPS
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers
Package Information (continued)
6LSOT.EPS
MAX6816/MAX6817/MAX6818
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MAX6816/MAX6817/MAX6818
Package Information (continued)
SSOP.EPS
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MAX6816/MAX6817/MAX6818
NOTES
±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MAX6816/MAX6817/MAX6818
NOTES
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 1999 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers MA

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