19-4128; Rev 0; 5/08 On/Off Controller with Debounce and ±15kV ESD Protection 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 -40°C to +125°C automotive temperature range. Features o Robust Inputs Can Handle Power Supplies Up to ±25V o ±15kV ESD Protection o Latched Output o Low 7µA Supply Current o Operates from 2.7V to 5.5V o -40°C to +125°C Temperature Range o Thin SOT23 Package Ordering Information PART TEMP RANGE PINPACKAGE MAX16054AZT+T -40°C to +125°C 6 Thin SOT23 TOP MARK +AADU +Denotes a lead-free package. T = Tape and reel package. Devices are offered in 2.5k unit increments. Typical Operating Circuits Applications PDAs MP3/Video Players LDO Portable Electronics EN Set-Top Boxes VCC Portable Instrumentation OUT White Goods 3V μP Pin Configuration MAX16054 IN OUT TOP VIEW CLEAR + IN 1 GND 2 MAX16054 CLEAR 3 THIN SOT23 6 VCC 5 OUT 4 OUT GND ON/OFF WITH LDO Typical Operating Circuits continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX16054 General Description MAX16054 On/Off Controller with Debounce and ±15kV ESD Protection 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 Continuous Power Dissipation (TA = +70°C) 6-Pin Thin SOT23 (derate 9.1mW/°C at +70°C) (Note 1) ............................727mW Operating Temperature Range .........................-40°C to +125°C Maximum Junction Temperature .....................................+150°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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. ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.5V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +5V, TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS Operating Voltage Range VCC (Note 3) Supply Current ICC VCC = 5V, IOUT = IOUT = 0, IN not connected Debounce Duration tDP MIN TYP MAX UNITS 5.5 V 7 20 µA 2.7 TA = +25°C 20 50 80 TA = -40°C to +125°C 5 50 99 VIL IN Threshold VIH 0.65 VCC = 5V 2.5 VCC = 2.7V 2.0 IN Hysteresis 32 IIN IN Voltage Range VIN Undervoltage-Lockout Threshold OUT/OUT Output Voltage V 420 IN Pullup Resistance IN Current VUVLO 63 VIN = +25V -1.5 -25 VCC falling VOL ISINK = 1.6mA VOH ISOURCE = 0.4mA CLEAR Input Current CLEAR High to OUT Low Propagation Delay VCLEAR_IH 1.8 kΩ mA +25 V 2.4 V 0.4 VCC - 1.0 V 0.7 VCC = 5V 2.4 VCC = 2.7V 2.0 ICLEAR tCO mV 100 +1.5 VIN = -25V VCLEAR_IL CLEAR Threshold ms V -1 RL = 10kΩ, CL = 100pF +1 µA 200 ns ESD CHARACTERISTICS ESD Protection IN IEC 61000-4-2 Air Discharge ±15 IEC 61000-4-2 Contact Discharge ±8 Human Body Model ±15 kV Note 2: All devices are 100% production tested at TA = +25°C. 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 SUPPLY CURRENT vs. TEMPERATURE MAX16054 toc02 8 10V IN 10V/div VCC = 5V 7 6 -10V 6 OUT 5V/div 5 4 0V VCC = 3V 3 OUT 5V/div 0V 2 1 5 OUTPUT LOGIC LEVEL (V) 9 MAX16054 toc03 MAX16054 toc01 10 VOH, ISOURCE = 0.4mA 4 3 2 1 VOL, ISINK = 1.6mA VCC = 5V 0 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 2.0 10ms/div DEBOUNCE DELAY PERIOD vs. TEMPERATURE 54 VCC = 3V 52 50 48 46 4.0 4.5 5.0 5.5 VCC = 5V 44 42 MAX16054 toc05 56 3.5 3.5 VCC UNDERVOLTAGE LOCKOUT (V) 58 3.0 VCC UNDERVOLTAGE LOCKOUT vs. TEMPERATURE MAX16054 toc04 60 2.5 SUPPLY VOLTAGE (V) TEMPERATURE (°C) DEBOUNCE DELAY PERIOD (ms) SUPPLY CURRENT (μA) OUTPUT LOGIC LEVEL vs. SUPPLY VOLTAGE DEBOUNCE OF CLOSING SWITCH 3.0 2.5 2.0 1.5 1.0 0.5 VCC RISING 0 40 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) Pin Description PIN 1 NAME FUNCTION Switch Toggle Input. IN features a -25V to +25V maximum input range and includes an internal 63kΩ pullup resistor to VCC. Connect a pushbutton from IN to GND. IN 2 GND 3 CLEAR 4 OUT 5 OUT Active-High CMOS Output VCC +2.7V to +5.5V Supply Input. In noisy environments, bypass VCC to GND with a 0.1µF or greater ceramic capacitor. 6 Ground Clear Input. Pull CLEAR high to force OUT low. Connect CLEAR to GND if unused. Active-Low CMOS Output _______________________________________________________________________________________ 3 MAX16054 Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) On/Off Controller with Debounce and ±15kV ESD Protection MAX16054 Functional Diagram Q D OUT Q VCC D VCC OSC COUNTER R Q OUT T CLR CLR R RPU IN XNOR UNDERVOLTAGE LOCKOUT CLEAR ESD PROTECTION 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 4 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. _______________________________________________________________________________________ On/Off Controller with Debounce and ±15kV ESD Protection MAX16054 VCC UVLO tDP tDP tDP tDP tDP IN 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. 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 63kΩ (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, 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. _______________________________________________________________________________________ 5 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 1.5kΩ 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 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF 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. RD 330Ω RC 50MΩ to 100MΩ RD 1500Ω STORAGE CAPACITOR DISCHARGE RESISTANCE CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE Cs 150pF STORAGE CAPACITOR DEVICE UNDER TEST Figure 3a. IEC 61000-4-2 ESD Test Model Figure 2a. Human Body ESD Test Model I IP 100% 90% Ir 100% PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 90% AMPERES I PEAK MAX16054 On/Off Controller with Debounce and ±15kV ESD Protection 36.8% 10% 0 0 tRL TIME 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 _______________________________________________________________________________________ On/Off Controller with Debounce and ±15kV ESD Protection 3.3V VCC VCC OUT 3V OUT μP MAX16054 IN MAX16054 OUT IN OUT CLEAR CLEAR GND GND ON/OFF WITH p-CHANNEL MOSFET PUSH EITHER BUTTON 3.3V 3.3V VCC OUT VCC OUT MAX16054 MAX16054 IN IN OUT OUT CLEAR CLEAR GND GND PUSH BOTH BUTTONS DIGITAL PUSHBUTTON WITH LED (DEFAULT = OFF) _______________________________________________________________________________________ 7 MAX16054 Typical Operating Circuits (continued) On/Off Controller with Debounce and ±15kV ESD Protection MAX16054 Typical Operating Circuits (continued) 3.3V 3.3V VCC VCC OUT OUT MAX16054 MAX16054 IN R, C SETS PULSE WIDTH IN OUT R OUT CLEAR CLEAR GND GND DIGITAL PUSHBUTTON WITH LED (DEFAULT = ON) PUSHBUTTON ONE-SHOT 3.3V C 3.3V A VCC B VCC OUT OUT MAX16054 IN MAX16054 OUT IN OUT CLEAR CLEAR GND GND 4-POSITION PUSHBUTTON SELECTOR SWITCH A LED STATE B STATE 0 STATE 1 STATE 2 STATE 3 8 _______________________________________________________________________________________ On/Off Controller with Debounce and ±15kV ESD Protection PROCESS: BiCMOS For the latest package outline information, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 6 Thin SOT23 Z6-1 21-0114 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 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX16054 Package Information Chip Information