MAX6818EAP ,15kV ESD-Protected / Single/Dual/Octal / CMOS Switch DebouncersMAX6816/MAX6817/MAX681819-4770; Rev 1; 1/99±15kV ESD-Protected, Single/Dual/Octal,CMOS Switch Debou ..
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MAX6818EAP+T ,±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch DebouncersApplications PACKAGETOP MARK● µP Switch InterfacingMAX6816EUS-T -40°C to +125°C 4 SOT143 KABA● Indu ..
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MAX6816EUS-T-MAX6817EUT-T-MAX6818EAP
15kV ESD-Protected / Single/Dual/Octal / CMOS Switch Debouncers
General DescriptionThe 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 con-
trolled by an enable (EN) pin, and is pin-compatible
with the ‘LS573 octal latch (except for the CHpin),
allowing easy interfacing to a digital data bus.
ApplicationsµP Switch Interfacing
Industrial Instruments
PC-Based Instruments
Portable Instruments
Automotive Applications
Membrane Keypads
FeaturesRobust Inputs can Exceed Power Supplies
up to ±25VESD Protection for Input Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap DischargeSmall SOT Packages (4 and 6 pins)Single-Supply Operation from +2.7V to +5.5VSingle (MAX6816), Dual (MAX6817), and Octal
(MAX6818) Versions AvailableNo External Components Required6µA Supply CurrentThree-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)
MAX6816/MAX6817/MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Typical Operating Circuit19-4770; Rev 1; 1/99
Pin Configurations
Ordering Information
MAX6816/MAX6817/MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +5V, TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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 + 0.3V)
OUT Short-Circuit Duration
(One or Two Outputs to GND)....................................Continuous
Continuous Power Dissipation (TA= +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 to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX6816/MAX6817/MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
_______________Detailed Description
Theory of OperationThe MAX6816/MAX6817/MAX6818 are designed to
eliminate the extraneous level changes that result from
interfacing with mechanical switches (switch bounce).
Virtually all mechanical switches bounce upon opening
or closing. These switch debouncers remove bounce
when a switch opens or closes by requiring that
sequentially clocked inputs remain in the same state for
a number of sampling periods. The output does not
change until the input is stable for a duration of 40ms.
The circuit block diagram (Figure 1) shows the func-
tional blocks consisting of an on-chip oscillator,
counter, exclusive-NOR gate, and D flip-flop. When the
input does not equal the output, the XNOR gate issues
a counter reset. When the switch input state is stable
for the full qualification period, the counter clocks the
flip-flop, updating the output. Figure 2 shows the typical
opening and closing switch debounce operation. On
the MAX6818, the change output (CH)is updated
simultaneously with the switch outputs.
Undervoltage LockoutThe undervoltage lockout circuitry ensures that the out-
puts are at the correct state on power-up. While the sup-
ply voltage is below the undervoltage threshold
(typically 1.9V), the debounce circuitry remains trans-
parent. Switch states are present at the logic outputs
without delay.
MAX6816/MAX6817/MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Pin DescriptionFigure 1. Block Diagram
Robust Switch InputsThe switch inputs on the MAX6816/MAX6817/MAX6818
have overvoltage clamping diodes to protect against
damaging fault conditions. Switch input voltages
can safely swing ±25V to ground (Figure 3). Proprietary
ESD-protection structures protect against high
ESD encountered in harsh industrial environments,
membrane keypads, and portable applications.
They are designed to withstand ±15kV per the
IEC1000-4-2 Air Gap Discharge Test and ±8kV per the
IEC1000-4-2 Contact Discharge Test.
Since there are 63kΩ(typical) pull-up resistors con-
nected to each input, driving an input to -25V will draw
approximately 0.5mA (up to 4mA for eight inputs) from
the VCCsupply. Driving an input to +25V will cause
approximately 0.32mA of current (up to 2.6mA for eight
inputs) to flow back into the VCCsupply. If the total sys-
tem VCC supply current is less than the current flowing
back into the VCCsupply, VCCwill rise above normal
levels. In some low-current systems, a zener diode on
VCCmay be required.
±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The MAX6816/MAX6817/MAX6818 have
extra protection against static electricity. Maxim's engi-
neers have developed state-of-the-art structures to pro-
tect against ESD of ±15kV at the switch inputs without
MAX6816/MAX6817/MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch DebouncersFigure 2. Input Characteristics
Figure 4. MAX6818 µP-Interface Timing Diagram
Figure 5. MAX6818 Typical µP Interfacing Circuit
MAX6816/MAX6817/MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncersdamage. The ESD structures withstand high ESD in all
states: normal operation, shutdown, and powered
down. After an ESD event, the MAX6816/MAX6817/
MAX6818 keep working without latchup, whereas other
solutions can latch and must be powered down to
remove latchup.
ESD protection can be tested in various ways; these
products are characterized for protection to the follow-
ing limits:±15kV using the Human Body Model±8kV using the Contact-Discharge method specified
in IEC1000-4-2±15kV using IEC1000-4-2’s Air-Gap method.
ESD Test Conditions ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Human Body Model Figure 6a shows the Human Body Model and Figure 6b
shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5kΩresistor.
IEC1000-4-2 The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX6816/
MAX6817/MAX6818 help you design equipment that
Figure 6b. Human Body Current WaveformFigure 7a. IEC1000-4-2 ESD Test Model
