Page 1
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 -40°C to +125°C automotive temperature range.
Applications
PDAs
MP3/Video Players
Portable Electronics
Set-Top Boxes
Portable Instrumentation
White Goods
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
MAX16054
On/Off Controller with Debounce and
±15kV ESD Protection
________________________________________________________________
Maxim Integrated Products
1
Pin Configuration
Ordering Information
MAX16054
OUT
3V
LDO
μP
EN
OUT
IN
CLEAR
GND
ON/OFF WITH LDO
V
CC
Typical Operating Circuits
19-4128; Rev 0; 5/08
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.
+
Denotes a lead-free package.
T = Tape and reel package. Devices are offered in 2.5k unit
increments.
PART
PINPACKAGE
TOP
MARK
MAX16054AZT+T
+AADU
Typical Operating Circuits continued at end of data sheet.
TEMP RANGE
-40°C to +125°C 6 Thin SOT23
TOP VIEW
+
1
IN
GND
MAX16054
2
34
THIN SOT23
6V
5 OUT
CC
OUTCLEAR
Page 2
MAX16054
On/Off Controller with Debounce and
±15kV ESD Protection
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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)
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.
Note 1: As per JEDEC 51 standard, multilayer board (PCB).
Note 2: All devices are 100% production tested at T
A
= +25°C. Specifications over temperature limits are guaranteed by design.
Note 3: OUT is guaranteed to be low for 1.0V ≤ V
CC
≤ V
UVLO
.
V
CC
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 (V
CC
+ 0.3V)
Short-Circuit Duration
OUT, OUT to GND ...................................................Continuous
Continuous Power Dissipation (T
A
= +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
Operating Voltage Range V
Supply Current I
Debounce Duration t
IN Hysteresis 420 mV
IN Pullup Resistance 32 63 100 kΩ
IN Current I
IN Voltage Range V
Undervoltage-Lockout Threshold V
OUT/OUT Output Voltage
CLEAR Input Current I
CLEAR High to OUT Low
Propagation Delay
ESD CHARACTERISTICS
ESD Protection IN
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC
CC
DP
V
V
IN
UVLO
V
OL
V
OH
V
CLEAR_IL
V
CLEAR_IH
CLEAR
t
CO
(Note 3) 2.7 5.5 V
VCC = 5V, I
IN not connected
TA = +25°C 20 50 80
TA = -40°C to +125°C 5 50 99
IL
VCC = 5V 2.5IN Threshold
IH
VCC = 2.7V 2.0
VIN = +25V +1.5
VIN = -25V -1.5
IN
VCC falling 1.8 2.4 V
I
= 1.6mA 0.4
SINK
I
SOURCE
VCC = 5V 2.4CLEAR Threshold
VCC = 2.7V 2.0
RL = 10kΩ, CL = 100pF 200 ns
= I
OUT
= 0.4mA VCC - 1.0
= 0,
OUT
IEC 61000-4-2 Air
Discharge
IEC 61000-4-2 Contact
Discharge
Human Body Model ±15
720µA
0.65
-25 +25 V
0.7
-1 +1 µA
±15
±8
ms
V
mA
V
V
kV
Page 3
MAX16054
On/Off Controller with Debounce and
±15kV ESD Protection
_______________________________________________________________________________________
3
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
DEBOUNCE DELAY PERIOD
vs. TEMPERATURE
MAX16054 toc04
TEMPERATURE (°C)
DEBOUNCE DELAY PERIOD (ms)
1109565 80-10 5 20 35 50-25
42
44
46
48
50
52
54
56
58
60
40
-40 125
VCC = 5V
VCC = 3V
VCC UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX16054 toc05
TEMPERATURE (°C)
V
CC
UNDERVOLTAGE LOCKOUT (V)
1109580655035205-10-25
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
-40 125
VCC RISING
Pin Description
SUPPLY CURRENT
vs. TEMPERATURE
10
9
8
VCC = 5V
7
6
5
4
VCC = 3V
3
SUPPLY CURRENT (μA)
2
1
0
-40 125
TEMPERATURE (°C)
DEBOUNCE OF CLOSING SWITCH
MAX16054 toc01
VCC = 5V
1109565 80-10 5 20 35 50-25
10ms/div
MAX16054 toc02
10V
IN
10V/div
-10V
OUT
5V/div
0V
OUT
5V/div
0V
6
5
4
3
2
OUTPUT LOGIC LEVEL (V)
1
0
2.0 5.5
OUTPUT LOGIC LEVEL
vs. SUPPLY VOLTAGE
VOH, I
= 0.4mA
SOURCE
VOL, I
SUPPLY VOLTAGE (V)
SINK
MAX16054 toc03
= 1.6mA
5.04.54.03.53.02.5
PIN NAME FUNCTION
1IN
2 GND Ground
3 CLEAR Clear Input. Pull CLEAR high to force OUT low. Connect CLEAR to GND if unused.
4 OUT Active-Low CMOS Output
5 OUT Active-High CMOS Output
6 V
CC
Switch Toggle Input. IN features a -25V to +25V maximum input range and includes an internal 63kΩ
pullup resistor to V
. Connect a pushbutton from IN to GND.
CC
+2.7V to +5.5V Supply Input. In noisy environments, bypass VCC to GND with a 0.1µF or greater
ceramic capacitor.
Page 4
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.
MAX16054
On/Off Controller with Debounce and
±15kV ESD Protection
4 _______________________________________________________________________________________
Functional Diagram
V
CC
D
V
ESD
CC
R
PU
IN
PROTECTION
OSC
R
XNOR
COUNTER
R
UNDERVOLTAGE
LOCKOUT
CLR
Q
Q
T
CLR
MAX16054
D
Q
OUT
OUT
CLEAR
Page 5
Undervoltage Lockout
The undervoltage-lockout circuitry ensures that the outputs are at the correct state on power-up. While VCCis
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 V
CC
supply. Driving the input to +25V causes
approximately 0.32mA of current to flow back into the
VCCsupply. If the total system VCCsupply current is
less than the current flowing back into the VCCsupply,
VCCrises above normal levels. In some low-current systems, a zener diode on VCCmay 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.
MAX16054
On/Off Controller with Debounce and
±15kV ESD Protection
_______________________________________________________________________________________ 5
Figure 1. MAX16054 Timing Diagram
V
CC
UVLO
IN
OUTPUT OF D
FLIP-FLOP
(INVERTED
IN AFTER
DEBOUNCE)
OUT
CLEAR
t
t
DP
t
DP
t
CO
DP
t
DP
t
DP
Page 6
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
1.5kΩ 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
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.
On/Off Controller with Debounce and
±15kV ESD Protection
6 _______________________________________________________________________________________
Figure 2a. Human Body ESD Test Model
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
150pF
R
C
50MΩ to 100MΩ
RD
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 2b. Human Body Current Waveform
IP 100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPERES
Figure 3a. IEC 61000-4-2 ESD Test Model
tR = 0.7ns TO 1ns
30ns
60ns
t
100%
90%
10%
I
PEAK
I
Figure 3b. IEC 61000-4-2 ESD Generator Current Waveform
R
D
1500Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
R
C
1MΩ
CHARGE-CURRENT
LIMIT RESISTOR
C
100pF
s
DEVICE
UNDER
TEST
Page 7
MAX16054
On/Off Controller with Debounce and
±15kV ESD Protection
_______________________________________________________________________________________ 7
Typical Operating Circuits (continued)
3V
IN
ON/OFF WITH p-CHANNEL MOSFET
V
CC
MAX16054
GND
MAX16054
IN
OUT
OUT
CLEAR
3.3V
V
CC
OUT
OUT
3.3V
V
CC
CC
OUT
OUT
CLEAR
GND
OUT
OUT
μP
MAX16054
IN
PUSH EITHER BUTTON
3.3V
V
MAX16054
IN
CLEAR
GND
PUSH BOTH BUTTONS
DIGITAL PUSHBUTTON WITH LED (DEFAULT = OFF)
CLEAR
GND
Page 8
MAX16054
On/Off Controller with Debounce and
±15kV ESD Protection
8 _______________________________________________________________________________________
Typical Operating Circuits (continued)
DIGITAL PUSHBUTTON WITH LED (DEFAULT = ON)
MAX16054
IN
3.3V
V
CC
GND
OUT
OUT
CLEAR
3.3V
V
CC
OUT
3.3V
V
CC
OUT
MAX16054
IN
PUSHBUTTON ONE-SHOT
A
GND
3.3V
V
OUT
CLEAR
CC
OUT
R
C
B
R, C SETS
PULSE WIDTH
MAX16054
IN
OUT
CLEAR
GND
IN
MAX16054
GND
OUT
CLEAR
4-POSITION PUSHBUTTON SELECTOR SWITCH
LED STATE
A
STATE
0
STATE
1
STATE
2
STATE
3
B
Page 9
MAX16054
On/Off Controller with Debounce and
±15kV ESD Protection
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.
Package Information
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
Chip Information
PROCESS: BiCMOS
Loading...