MAX6816EUS+T ,±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch DebouncersGeneral Description Beneits and
MAX6816EUS-T ,15kV ESD-Protected / Single/Dual/Octal / CMOS Switch DebouncersApplications PART TEMP. RANGEPACKAGE TOP MARKµP Switch InterfacingMAX6816EUS-T -40°C to +85°C 4 SOT ..
MAX6817EUT+T ,±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch DebouncersFeaturesThe MAX6816/MAX6817/MAX6818 are single, dual, and ● Switch Debouncer Integration Simplifies ..
MAX6817EUT-T ,15kV ESD-Protected / Single/Dual/Octal / CMOS Switch DebouncersFeaturesThe MAX6816/MAX6817/MAX6818 are single, dual, and' Robust Inputs can Exceed Power Supplieso ..
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 ..
MAX6818EAP+ ,±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch DebouncersMAX6816/MAX6817/ ±15kV ESD-Protected, Single/Dual/Octal, MAX6818 CMOS Switch Debouncers
MB3789PFV ,Switching Regulator Controller (Supporting External Synchronization)FUJITSU SEMICONDUCTORDS04-27211-3EDATA SHEETASSP For Power Supply
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MB3790PF ,Battery Backup ICFUJITSU SEMICONDUCTORDS04-27502-3EDATA SHEETASSP For Power Supply
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MAX6816EUS+T-MAX6817EUT+T-MAX6818EAP+-MAX6818EAP+T-MAX6818EAP-T
±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
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
Beneits and Features●Switch Debouncer Integration Simplifies System
Interface to Mechanical SwitchesSingle-Supply Operation from +2.7V to +5.5VNo External Components Required Single (MAX6816), Dual (MAX6817), and
Octal (MAX6818) Versions Available 6μA Supply Current ●Built-In Protection Circuitry Improves System
ReliabilityInputs 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 InterfaceThree-State Outputs for Directly Interfacing to μP (MAX6818) Switch Change-of-State Output Simpliies 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.
PARTTEMP RANGEPIN-
PACKAGE
SOT
TOP MARK
MAX6816EUS-T-40°C to +125°C4 SOT143KABA
MAX6817EUT-T-40°C to +125°C6 SOT23-6AAAU
MAX6818EAP-40°C to +125°C20 SSOP—
VCC
OUTIN
GND
MAX6816
SOT143TOP VIEW
MECHANICAL
SWITCH
RESET
GND
DEBOUNCED
OUTPUT
VCC
0.1µF
OUT
MAX6816
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch DebouncersPin Configurations continued at end of data sheet.
Pin Conigurations
Ordering Information
Typical Operating Circuit
Voltage (with respect to GND)
VCC ......................................................................-0.3V to +6VIN_ (Switch Inputs) .............................................-30V to +30VEN ........................................................................-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) ........320mW6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........691mW20-Pin SSOP (derate 8.0mW/°C above +70°C) ..........640mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°CContaining lead ............................................................+240°C
(VCC = +2.7V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +5V, TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating Voltage RangeVCC2.75.5V
Supply CurrentICCVCC = 5V, IOUT = 0A, IN_ = VCC620µA
Debounce DurationtDPMAX6818204040msMAX6816/MAX6817205080
Input Threshold
VIL0.8V
VIHVCC = 5V2.4VVCC = 2.7V2.0
Input Hysteresis300mV
Input Pullup Resistance3263100kΩ
IN Input CurrentIINVIN = ±15V±1mA
Input Voltage RangeVIN-25+25V
Undervoltage-Lockout Threshold1.92.6V
OUT_, CH Output VoltageVOLISINK = 1.6mA0.4VVOHISOURCE = 0.4mAVCC - 1.0
EN Pulse WidthtEN200ns
EN ThresholdVCC = 5V0.81.72.4VVCC = 2.7V0.81.12.0
EN Input CurrentIIL±1µA
EN Low to Out Active
Propagation DelaytPERL = 10kΩ, CL = 100pF100ns
EN High to Out Three-State
Propagation DelaytPDRL = 1kΩ, CL = 15pF100ns
EN Low to CH Out High
Propagation DelaytPCRL = 10kΩ, CL = 50pF100ns
OUT_ Three-State Leakage CurrentVOUT = 0V or VCC±10µA
ESD CHARACTERISTICSESD ProtectionIN_
IEC 1000-4-2 Air-Gap Discharge±15IEC 1000-4-2 Contact Discharge±8
Human Body Model±15
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Electrical CharacteristicsStresses 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.
Absolute Maximum Ratings
(TA = +25°C, unless otherwise noted.)
VCC UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX6816 toc07
UNDERVOLTAGE LOCKOUT (V)
DEBOUNCE DELAY PERIOD
vs. TEMPERATURE
MAX6816 toc06
DEBOUNCE DELAY PERIOD (ms)
VCC = 5V
VCC = 3V4356
MAX6818 EN INPUT LOGIC THRESHOLD
vs. SUPPLY VOLTAGEMAX6816 toc05
SUPPLY VOLTAGE (V)
LOGIC THRESHOLD (V)4356
OUTPUT LOGIC LEVEL
vs. SUPPLY VOLTAGEMAX6816 toc04
SUPPLY VOLTAGE (V)
OUTPUT LOGIC LEVEL (V)
VOH, ISOURCE = 0.4mA
VOL, ISINK = 1.6mA
-5V
10ms/div
DEBOUNCE OF OPENING SWITCHMAX6816 TOC03
VCC = 5V
IN (5V/div)
OUT (2V/div)
IN (5V/div)
OUT (2V/div)
-5V
10ms/div
DEBOUNCE OF CLOSING SWITCHMAX6816 TOC02
VCC = 5V0
SUPPLY CURRENT vs. TEMPERATURE
MAX6816 toc01
TEMPERATURE (C)
SUPPLY CURRENT (
VCC = 5V
VCC = 3V
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Typical Operating Characteristics
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
functional 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 supply voltage is below the undervoltage threshold
(typically 1.9V), the debounce circuitry remains
transparent. Switch states are present at the logic outputs
with no debouce delay.
Figure 1. Block Diagram
PIN
NAMEFUNCTIONMAX6816MAX6817MAX6818210GNDGround——INSwitch Input1, 3—IN1, IN2Switch Inputs—2–9IN1–IN8Switch Inputs——OUTCMOS Debounced Output4, 6—OUT2, OUT1CMOS Debounced Outputs—12–19OUT8–OUT1CMOS Debounced Outputs520VCC+2.7V to +5.5V Supply Voltage—1ENActive-Low, Three-State Enable Input for outputs. Resets CH.
Tie to GND to “always enable” outputs.—11CHChange-of-State Output. Goes low on switch input change of
state. Resets on EN. Leave unconnected if not used.
VCC
VCC
VCC
RPUQDCOUNTERLOAD
OUT
ESD
PROTECTION
UNDER-
VOLTAGE
LOCKOUT
OSC.
MAX6816
MAX6817
MAX6818
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Pin Description
Robust Switch InputsThe switch inputs on the MAX6816–MAX6818 have
overvoltage-clamping diodes to protect against damaging
fault conditions. Switch input voltage scan 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 IEC 1000-4-2 Air-Gap Discharge Test and
±8kV per the IEC 1000-4-2 Contact Discharge Test.
Since there are 63kΩ (typical) pullup resistors
connected to each input, driving an input to -25V draws
approximately 0.5mA (up to 4mA for eight inputs) from
the VCC supply. Driving an input to +25V will cause
approximately 0.32mA of current (up to 2.6mA for eight
inputs) to flow back into the VCC supply. If the total system
VCC supply current is less than the current flowing back
into the VCC supply, VCC will rise above normal levels.
In some low-current systems, a zener diode on VCC may
be required.
±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic dis-
charges encountered during handling and assembly. The
MAX6816–MAX6818 have extra protection against static
electricity. Maxim’s engineers have developed state-of-
the-art structures to protect against ESD of ±15kV at the
switch inputs without damage. The ESD structures with-
stand high ESD in all states: normal operation, shutdown,
and powered down. After an ESD event, the MAX6816–
MAX6818 keep working without latchup, whereas other
solutions can latch and must be powered down to
remove latchup.
Figure 5. MAX6818 Typical μP Interfacing Circuit
Figure 4. MAX6818 μP Interface Timing Diagram
Figure 3. Switch Input ±25V Fault Tolerance
Figure 2. Input Characteristics
IN1
SW1
SW8
IN8
+VCC
+VCC
0.1µF
OUT1
OUT8I/O
IRQ
MAX6818
tEN
OUT NORMALLY
LOW
OUT NORMALLY
HIGH
OUT1–OUT8
1/2 VCC1/2 VCC
1/2 VCC
1/2 VCC
1/2 VCC
tPEtPD
tPD
VOL + 0.5V
VOH - 0.5V
tPE
tPC
OUT1–OUT8
20ms/div
20V
-20V
OUT
(2V/div)
(20V/div)
tDP
IN1
OUT1
IN2
OUT2
MAX6818 ONLY
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
ESD protection can be tested in various ways;
these products are characterized for protection to the
following limits:
1) ±15kV using the Human Body Model
2) ±8kV using the Contact-Discharge method speciied
in IEC 1000-4-2
3) ±15kV using IEC 1000-4-2’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
discharged into a low impedance. This model consists
of a 100pF capacitor charged to the ESD voltage of
interest, which is then discharged into the test device
through a 1.5kΩ resistor.
IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not
specifically refer to integrated circuits. The MAX6816–
MAX6818 help you design equipment that meets
Level 4 (the highest level) of IEC 1000-4-2,
without the need for additional ESD-protection
components.
Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform
Figure 7a. IEC 1000-4-2 ESD Test Model
Figure 6b. Human Body Current Waveform
Figure 6a. Human Body ESD Test Model
tr = 0.7ns to 1ns
30ns
60ns
100%
90%
10%
IPEAK
CHARGE CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
150pF
RC 50MΩ to 100MΩRD 330Ω
HIGH-
VOLTAGE
SOURCE
DEVICE
UNDER
TEST
IP 100%
90%
36.8%
tRLTIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
10%
AMPERES
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
100pF
RC 1MΩRD 1500Ω
HIGH-
VOLTAGE
SOURCE
DEVICE
UNDER
TEST
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
