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| 19-4128; Rev 0; 5/08 On/Off Controller with Debounce and 15kV ESD Protection General Description The MAX16054 is a pushbutton on/off controller with a single switch debouncer and built-in latch. It accepts a noisy input from a mechanical switch and produces a clean latched digital output after a factory-fixed qualification delay. The MAX16054 eliminates contact bounce during switch opening and closing. The state of the output changes only when triggered by the falling edge of the debounced switch input; the output remains unchanged on the rising edge of the input. Robust switch inputs handle 25V levels and are 15kV ESD protected for use in harsh industrial environments. The MAX16054 features a complementary output, OUT, which is the inverted state of OUT. An asynchronous CLEAR input allows an external signal to force the output flip-flop low. Undervoltage-lockout circuitry ensures that OUT is in the off state upon power-up. The MAX16054 requires no external components, and its low supply current makes it ideal for use in portable equipment. The MAX16054 operates from a +2.7V to +5.5V single supply. The MAX16054 is offered in a 6-pin thin SOT23 package and operates over the -40C to +125C automotive temperature range. Features o Robust Inputs Can Handle Power Supplies Up to 25V o 15kV ESD Protection o Latched Output o Low 7A Supply Current o Operates from 2.7V to 5.5V o -40C to +125C Temperature Range o Thin SOT23 Package MAX16054 Ordering Information PART TEMP RANGE PINPACKAGE TOP MARK +AADU MAX16054AZT+T -40C to +125C 6 Thin SOT23 +Denotes a lead-free package. T = Tape and reel package. Devices are offered in 2.5k unit increments. Applications PDAs MP3/Video Players Portable Electronics Set-Top Boxes Portable Instrumentation White Goods 3V Typical Operating Circuits LDO EN VCC OUT P Pin Configuration IN MAX16054 OUT TOP VIEW + IN 1 6 VCC GND CLEAR GND 2 MAX16054 5 OUT CLEAR 3 4 OUT ON/OFF WITH LDO THIN SOT23 Typical Operating Circuits continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. On/Off Controller with Debounce and 15kV ESD Protection MAX16054 ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V IN to GND ................................................................-30V to +30V CLEAR to GND .........................................................-0.3V to +6V OUT, OUT to GND......................................-0.3V to (VCC + 0.3V) Short-Circuit Duration OUT, OUT to GND ...................................................Continuous Note 1: As per JEDEC 51 standard, multilayer board (PCB). 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. Continuous Power Dissipation (TA = +70C) 6-Pin Thin SOT23 (derate 9.1mW/C at +70C) (Note 1) ............................727mW Operating Temperature Range .........................-40C to +125C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-60C to +150C Lead Temperature (soldering, 10s) .................................+300C ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.5V, TA = TJ = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5V, TA = +25C.) (Note 2) PARAMETER Operating Voltage Range Supply Current Debounce Duration SYMBOL VCC ICC tDP VIL IN Threshold IN Hysteresis IN Pullup Resistance IN Current IN Voltage Range Undervoltage-Lockout Threshold OUT/OUT Output Voltage IIN VIN VUVLO VOL VOH VCLEAR_IL CLEAR Threshold CLEAR Input Current CLEAR High to OUT Low Propagation Delay ESD CHARACTERISTICS IEC 61000-4-2 Air Discharge ESD Protection IN IEC 61000-4-2 Contact Discharge Human Body Model 15 8 15 kV VCLEAR_IH ICLEAR tCO RL = 10k, CL = 100pF VCC = 5V VCC = 2.7V 2.4 2.0 -1 +1 200 A ns VCC falling ISINK = 1.6mA ISOURCE = 0.4mA VCC - 1.0 0.7 V VIN = +25V VIN = -25V -1.5 -25 1.8 +25 2.4 0.4 32 VIH VCC = 5V VCC = 2.7V 2.5 2.0 420 63 100 +1.5 mV k mA V V V (Note 3) VCC = 5V, IOUT = IOUT = 0, IN not connected TA = +25C TA = -40C to +125C 20 5 CONDITIONS MIN 2.7 7 50 50 TYP MAX 5.5 20 80 99 0.65 V UNITS V A ms Note 2: All devices are 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 3: OUT is guaranteed to be low for 1.0V VCC VUVLO. 2 _______________________________________________________________________________________ On/Off Controller with Debounce and 15kV ESD Protection Typical Operating Characteristics (TA = +25C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE 9 8 SUPPLY CURRENT (A) 7 6 5 4 3 2 1 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 10ms/div VCC = 5V 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) VCC = 3V VCC = 5V MAX16054 toc01 MAX16054 DEBOUNCE OF CLOSING SWITCH MAX16054 toc02 OUTPUT LOGIC LEVEL vs. SUPPLY VOLTAGE 10V OUTPUT LOGIC LEVEL (V) IN 10V/div -10V OUT 5V/div 0V OUT 5V/div 0V MAX16054 toc03 10 6 5 VOH, ISOURCE = 0.4mA 4 3 2 1 VOL, ISINK = 1.6mA DEBOUNCE DELAY PERIOD vs. TEMPERATURE 58 DEBOUNCE DELAY PERIOD (ms) 56 54 52 50 48 46 44 42 40 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) VCC = 5V VCC = 3V MAX16054 toc04 VCC UNDERVOLTAGE LOCKOUT vs. TEMPERATURE MAX16054 toc05 60 3.5 VCC UNDERVOLTAGE LOCKOUT (V) 3.0 2.5 2.0 1.5 1.0 0.5 VCC RISING 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) Pin Description PIN 1 2 3 4 5 6 NAME IN GND CLEAR OUT OUT VCC FUNCTION Switch Toggle Input. IN features a -25V to +25V maximum input range and includes an internal 63k pullup resistor to VCC. Connect a pushbutton from IN to GND. Ground Clear Input. Pull CLEAR high to force OUT low. Connect CLEAR to GND if unused. Active-Low CMOS Output Active-High CMOS Output +2.7V to +5.5V Supply Input. In noisy environments, bypass VCC to GND with a 0.1F or greater ceramic capacitor. _______________________________________________________________________________________ 3 On/Off Controller with Debounce and 15kV ESD Protection MAX16054 Functional Diagram D VCC Q Q OUT D VCC OSC R RPU COUNTER R Q CLR T CLR OUT IN XNOR ESD PROTECTION UNDERVOLTAGE LOCKOUT CLEAR MAX16054 Detailed Description Theory of Operation The MAX16054 creates a push-on, push-off function using a momentary-contact normally open SPST switch. The high-to-low transition that occurs when closing the switch causes OUT to go high and OUT to go low. The output state remains latched after the switch is released/opened. Closing the switch again causes OUT to go low and OUT to go high. Debounce circuitry eliminates the extraneous level changes that result from interfacing with mechanical switches (switch bounce). Virtually all mechanical switches bounce upon opening and closing. The bounce when a switch opens or closes is eliminated by requiring that the sequentially clocked input remains in the same state for a number of sampling periods. The output does not change state from high-to-low or lowto-high until the input is stable for at least 50ms (typ). The Functional Diagram shows the functional blocks consisting of an on-chip oscillator, counter, exclusiveNOR gate, a D flip-flop, and a T (toggle) flip-flop. When the pushbutton input does not equal the internal debounced button state (the Q output of the D flipflop), the XNOR gate issues a counter reset. When the switch input state is stable for the full qualification period, the counter clocks the D flip-flop, changing the internal pushbutton state. The Q output of the D flip-flop is connected to a toggle flip-flop that toggles when the internal pushbutton state goes through a high-to-low transition. Figure 1 shows the typical opening and closing switch debounce operation. A rising pulse at CLEAR resets the T flip-flop and pulls OUT low and OUT high. 4 _______________________________________________________________________________________ On/Off Controller with Debounce and 15kV ESD Protection MAX16054 VCC UVLO tDP IN tDP tDP tDP tDP OUTPUT OF D FLIP-FLOP (INVERTED IN AFTER DEBOUNCE) tCO OUT CLEAR Figure 1. MAX16054 Timing Diagram Undervoltage Lockout The undervoltage-lockout circuitry ensures that the outputs are at the correct state on power-up. While VCC is less than the 2.1V (typ) undervoltage threshold and greater than 1.0V, OUT remains low and transitions at IN are ignored. VCC rises above normal levels. In some low-current systems, a zener diode on VCC may be required. 15kV ESD Protection ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The MAX16054 has extra protection against static electricity to protect against ESD of 15kV at the switch input without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. A design advantage of the MAX16054 is that it continues working without latchup after an ESD event, which eliminates the need to power-cycle the device. ESD protection can be tested in various ways; this product is characterized for protection to the following limits: 1) 15kV using the Human Body Model. 2) 8kV using the Contact-Discharge method specified in IEC 61000-4-2. 3) 15kV using the IEC 61000-4-2 Air-Gap method. Robust Switch Input The switch input (IN) has overvoltage clamping diodes to protect against damaging fault conditions. Switch input voltages can safely swing 25V to ground. 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 61000-4-2 Air-Gap Discharge test and 8kV per the IEC 61000-4-2 ContactDischarge test. Since there is a 63k (typ) pullup resistor connected to IN, driving the input to -25V draws approximately 0.5mA from the VCC supply. Driving the input to +25V causes approximately 0.32mA of current 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, _______________________________________________________________________________________ 5 On/Off Controller with Debounce and 15kV ESD Protection MAX16054 Human Body Model Figure 2a shows the Human Body Model, and Figure 2b 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 1.5k resistor. IEC 61000-4-2 The IEC 61000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX16054 helps in the design of equipment that meets IEC 61000-4-2, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 61000-4-2 is higher peak current in IEC 61000-4-2, because series resistance is RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE lower in the IEC 61000-4-2 model. Hence, the ESD withstand voltage measured to IEC 61000-4-2 is generally lower than that measured using the Human Body Model. Figure 3a shows the IEC 61000-4-2 model, and Figure 3b shows the current waveform for the IEC 61000-4-2 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. RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST Cs 100pF STORAGE CAPACITOR Cs 150pF STORAGE CAPACITOR Figure 2a. Human Body ESD Test Model Figure 3a. IEC 61000-4-2 ESD Test Model I IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 100% 90% tDL CURRENT WAVEFORM 10% Figure 2b. Human Body Current Waveform t R = 0.7ns TO 1ns t 30ns 60ns Figure 3b. IEC 61000-4-2 ESD Generator Current Waveform 6 _______________________________________________________________________________________ I PEAK On/Off Controller with Debounce and 15kV ESD Protection Typical Operating Circuits (continued) 3.3V MAX16054 VCC 3V OUT P VCC OUT MAX16054 IN OUT IN MAX16054 OUT CLEAR GND GND CLEAR ON/OFF WITH p-CHANNEL MOSFET PUSH EITHER BUTTON 3.3V 3.3V VCC VCC OUT OUT MAX16054 MAX16054 IN OUT CLEAR CLEAR GND GND IN OUT PUSH BOTH BUTTONS DIGITAL PUSHBUTTON WITH LED (DEFAULT = OFF) _______________________________________________________________________________________ 7 On/Off Controller with Debounce and 15kV ESD Protection MAX16054 Typical Operating Circuits (continued) 3.3V 3.3V VCC OUT VCC OUT R, C SETS PULSE WIDTH R OUT MAX16054 IN OUT IN MAX16054 CLEAR GND GND CLEAR C DIGITAL PUSHBUTTON WITH LED (DEFAULT = ON) PUSHBUTTON ONE-SHOT 3.3V 3.3V VCC OUT A VCC OUT B MAX16054 IN OUT IN CLEAR GND MAX16054 OUT CLEAR GND 4-POSITION PUSHBUTTON SELECTOR SWITCH LED STATE B STATE 0 STATE 1 STATE 2 STATE 3 A 8 _______________________________________________________________________________________ On/Off Controller with Debounce and 15kV ESD Protection Chip Information PROCESS: BiCMOS PACKAGE TYPE 6 Thin SOT23 Package Information For the latest package outline information, go to www.maxim-ic.com/packages. PACKAGE CODE Z6-1 DOCUMENT NO. 21-0114 MAX16054 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. |
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