MAX6816EUS+TGA8

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. 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. ●● Switch Debouncer Integration Simplifies System Interface to Mechanical Switches • Single-Supply Operation from +2.7V to +5.5V • No External Components Required • Single (MAX6816), Dual (MAX6817), and Octal (MAX6818) Versions Available • 6μA Supply Current ●● Built-In Protection Circuitry Improves System Reliability • 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 ●● Octal Version (MAX6818) Provides Direct Data Bus Interface • Three-State Outputs for Directly Interfacing to μP (MAX6818) • Switch Change-of-State Output Simplifies Polling and Interrupts (MAX6818) • Pin-Compatible with ‘LS573 (MAX6818) Ordering Information PART Applications ●● ●● ●● ●● ●● Benefits and Features µP Switch Interfacing Industrial Instruments PC-Based Instruments Portable Instruments Membrane Keypads TEMP RANGE SOT TOP MARK PINPACKAGE 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 — Note: There is a minimum order increment of 2500 pieces for SOT packages. Devices are available in both leaded and lead(Pb)-free/RoHScompliant packaging. Specify lead-free by replacing “-T” with “+T” when ordering. Pin Configurations Typical Operating Circuit TOP VIEW GND 1 4 VCC VCC MAX6816 MAX6816 MECHANICAL SWITCH IN 3 2 OUT OUT IN SOT143 Pin Configurations continued at end of data sheet. 19-4770; Rev 5; 4/15 µP 0.1µF GND DEBOUNCED OUTPUT RESET 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 + 0.3V) 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 +125°C Storage Temperature Range............................. -65°C to +160°C Lead Temperature (soldering, 10s).................................. +300°C Soldering Temperature (reflow) Lead(Pb)-free...............................................................+260°C Containing lead.............................................................+240°C 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. Electrical Characteristics (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) PARAMETER Operating Voltage Range SYMBOL VCC Supply Current ICC Debounce Duration tDP CONDITIONS MIN TYP 2.7 VCC = 5V, IOUT = 0A, IN_ = VCC VIH Input Hysteresis V 6 20 µA MAX6818 20 40 40 MAX6816/MAX6817 20 50 80 VCC = 5V 2.4 0.8 VCC = 2.7V Input Pullup Resistance IIN Input Voltage Range VIN VIN = ±15V 300 OUT_, CH Output Voltage EN Pulse Width 1.9 VOL VOH tEN ISINK = 1.6mA ISOURCE = 0.4mA VCC = 5V EN Threshold EN Input Current IIL EN Low to Out Active Propagation Delay tPE EN High to Out Three-State Propagation Delay EN Low to CH Out High Propagation Delay OUT_ Three-State Leakage Current 63 -25 Undervoltage-Lockout Threshold VCC = 2.7V ms V V 2.0 32 IN Input Current UNITS 5.5 VIL Input Threshold MAX mV 100 kW ±1 mA +25 V 2.6 V 0.4 VCC - 1.0 200 V ns 0.8 1.7 2.4 0.8 1.1 2.0 V ±1 µA RL = 10kW, CL = 100pF 100 ns tPD RL = 1kW, CL = 15pF 100 ns tPC RL = 10kW, CL = 50pF 100 ns VOUT = 0V or VCC ±10 µA ESD CHARACTERISTICS IEC 1000-4-2 Air-Gap Discharge ESD Protection IN_ ±15 IEC 1000-4-2 Contact Discharge ±8 Human Body Model ±15 kV Note 1: MAX6816 and MAX6817 production testing is done at TA = +25°C; overtemperature limits are guaranteed by design. www.maximintegrated.com Maxim Integrated │  2 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. SUPPLY VOLTAGE MAX6816 toc04 6 OUTPUT LOGIC LEVEL (V) 5V 4V 4V 2 0 -5V OUT (2V/div) 3 5V IN (5V/div) IN (5V/div) 4 MAX6816 TOC02 VCC = 5V 5 OUT (2V/div) SUPPLY CURRENT (µA) 6 DEBOUNCE OF OPENING SWITCH DEBOUNCE OF CLOSING SWITCH MAX6816 toc01 7 4 3 2 1 1 VOL, ISINK = 1.6mA 3 4 5 5 6 VCC UNDERVOLTAGE LOCKOUT vs. TEMPERATURE MAX6816 toc06 DEBOUNCE DELAY PERIOD (ms) 4 DEBOUNCE DELAY PERIOD vs. TEMPERATURE VCC = 5V VCC = 3V 35 -40 -25 -10 5 20 35 50 65 80 95 100 125 TEMPERATURE (°C) www.maximintegrated.com 3 SUPPLY VOLTAGE (V) 45 30 2 SUPPLY VOLTAGE (V) 50 40 0 6 5 MAX6816 toc07 2 VCC UNDERVOLTAGE LOCKOUT (V) 0 4 3 2 1 0 -40 -25 -10 5 20 35 50 65 80 95 100 125 TEMPERATURE (°C) Maxim Integrated │  3 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. Tie to GND to “always enable” outputs. — — 11 CH Change-of-State Output. Goes low on switch input change of state. Resets on EN. Leave unconnected if not used. +2.7V to +5.5V Supply Voltage D VCC VCC VCC D OSC. RPU IN ESD PROTECTION R COUNTER Q Q OUT LOAD UNDERVOLTAGE LOCKOUT MAX6816 MAX6817 MAX6818 Figure 1. Block Diagram Detailed Description Theory of Operation The 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 www.maximintegrated.com 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 Lockout The 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. Maxim Integrated │  4 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 0.1µF MAX6818 ONLY 0V -20V SW8 IN8 OUT1 D0 OUT8 D7 4V OUT (2V/div) Figure 5. MAX6818 Typical μP Interfacing Circuit 0V 20ms/div Figure 3. Switch Input ±25V Fault Tolerance Robust Switch Inputs The 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 www.maximintegrated.com 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 Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The MAX6816–MAX6818 have extra protection against static electricity. Maxim’s engineers have developed state-ofthe-art structures to protect against ESD of ±15kV at the switch inputs without damage. The ESD structures withstand 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. Maxim Integrated │  5 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. IEC 1000-4-2 ESD Test Model I IP 100% 90% Ir 100% PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 90% I PEAK AMPERES 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Figure 6b. Human Body Current Waveform 10% t r = 0.7ns to 1ns t 30ns 60ns 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 specified 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 www.maximintegrated.com Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform 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. Maxim Integrated │  6 MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers 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. Figure 7a shows the IEC 1000-4-2 model and Figure 7b shows the current waveform for the 8kV, IEC 1000-4-2, Level 4, ESD Contact-Discharge test. The Air-Gap test involves approaching the device with a charged probe. The Contact-Discharge method connects the probe to the device before the probe is energized. Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. MAX6818 µP Interfacing The MAX6818 has an output enable (EN) input that allows switch outputs to be three-stated on the µP data bus until polled by the µP. Also, state changes at the switch inputs are detected, and an output (CH) goes low after the debounce period to signal the µP. Figure 4 shows the timing diagram for enabling outputs and reading data. If the output enable is not used, tie EN to GND to “always enable” the switch outputs. If EN is low, CH is always high. If a change of state is not required, leave CH unconnected. Pin Configurations (continued) TOP VIEW IN1 1 GND 2 6 MAX6817 IN2 3 5 4 OUT1 EN 1 20 VCC IN1 2 19 OUT1 IN2 3 18 OUT2 IN3 4 IN4 5 VCC OUT2 SOT23-6 MAX6818 17 OUT3 16 OUT4 IN5 6 15 OUT5 IN6 7 14 OUT6 IN7 8 13 OUT7 IN8 9 12 OUT8 GND 10 11 CH SSOP Chip Information SUBSTRATE CONNECTED TO GND PROCESS: BiCMOS www.maximintegrated.com Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 4 SOT143 U4-1 21-0052 90-0183 6 SOT23 U6-4 21-0058 90-0175 20 SSOP A20-1 21-0056 90-0094 Maxim Integrated │  7 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. 4 7/14 No /V OPNs; removed automotive reference from Applications section 1 5 4/15 Updated Benefits and Features section 1 PAGES CHANGED DESCRIPTION — 1–4, 7 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2015 Maxim Integrated Products, Inc. │ 8