General Description
The MAX16122–MAX16125 pushbutton controllers with
single-supply monitors monitor one or two pushbuttons and
generate a hard reset signal if the buttons are pushed and
held for a setup delay. These devices make it easy to “hide”
the hard reset function in an existing pushbutton, such as a
soft power switch. The devices operate from 1.6V to 5.5V
and consume a quiescent current of only 5µA at 3V.
The MAX16122–MAX16125 have pin-programmable or
resistor-adjustable setup delay. Connect the SEL pin to
GND, VCC, or leave it unconnected to select the different
setup delays (depending on part suffix, see Table 1a) or
connect an external resistor from SEL to GND to set the
setup delays (E suffix only, see Table 1b).
The MAX16124/MAX16125 have one manual reset input
(MR), a reset output (RESET), and a soft reset output
(SRESET) which mirrors the state of the input. The
MAX16122/MAX16123 have two identical manual reset
inputs (MR1 and MR2) and one reset output (RESET). A
deglitch block is connected to each input to add a delay to
the falling edge with a fixed deglitch period of 20ms (tDB).
The devices feature a comparator that monitors the
input supply voltage. A variety of factory-trimmed threshold
options accommodate different supply voltages and
tolerances, eliminating external components. The factory-
set reset thresholds range from 1.58V to 4.63V to monitor
5V, 3.3V, 2.5V, and 1.8V supplies.
The MAX16122–MAX16125 are offered in a tiny 0.86mm
x 1.27mm, 6-bump WLP package and are specified over
the automotive temperature range (-40°C to +125°C).
Benets and Features
●Low Supply Current: < 5μA (typ) at 3V Over Temperature
●Precision Factory-Set VCC Monitoring Threshold for
1.8V, 2.5V, 3.3V, and 5V Supplies
●Fixed/Pin-Programmable or Resistor-Adjustable
Pushbutton Setup Delay
● Up to 2 Reset Outputs and 2 Debounced Pushbutton
Inputs
●Guaranteed RESET Valid for VCC Down to 0.95V
●Active-Low RESET Output (Push-Pull or Open-Drain)
●Immune to Short Power-Supply Transients
●0.86mm x 1.27mm 6-Bump WLP Package
● -40°C to +125°C Operating Temperature Range
Applications
●Smartphones
●Tablet PCs
●eBook Readers
●Portable/Battery-Powered Equipment
●Glucose Monitors/Patient Monitors
●Portable Instrumentation
Ordering Information appears at end of data sheet.
Typical Operating Circuits (continued) appears at end of data sheet.
19-6398; Rev 2; 4/16
VCC
SRESET
RESET RESET
INPUT
I/0
MR
GND GND
VCC
MAX16124
MAX16125
µP
0.1µF
1.6V TO 5.5V
MAX16122–MAX16125 Dual Pushbutton Controllers in
Tiny 6-Bump WLP Package
Typical Operating Circuits
(All pins referenced to GND)
VCC ..........................................................................-0.3V to +6V
RESET, SRESET to GND
Open-Drain ..............................................................-0.3V to +6V
Push-Pull .................................................. -0.3V to (VCC + 0.3V)
MR, MR1, MR2 ........................................................-0.3V to +6V
SEL ..........................................................................-0.3V to +6V
Input/Output Current (all pins) ............................................ 20mA
Continuous Power Dissipation (TA = +70°C) (Multilayer Board)
WLP (derate 10.5mW/°C above +70°C) ......................840mW
Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Soldering Temperature (reflow) .......................................+260°C
WLP
Junction-to-Ambient Thermal Resistance (θJA) ..........95°C/W
(Note 1)
(VCC = 1.6V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range VCC RESET state guaranteed for VCC ≥ 0.95V 1.6 5.5 V
VCC Undervoltage Lockout VCCUVLO 1.25 1.55 V
VCC Supply Current ICC
VCC = 5V, steady-state condition; MR,
MR1, MR2, RESET, and SRESET not
asserted
8 10 µA
Supply Current with Oscillator
Running ICC2 VCC = 3V 5 10 µA
VCC Reset Threshold VTH VCC falling
-2.5% VTH +2.5%
V
VCC Reset Threshold Hysteresis VHYST 2 %
Reset Threshold Tempco 30
ppm/°C
VCC to RESET Output Delay tD
VCC falling at 10mV/µs from
(VTH + 100mV) to (VTH - 100mV) 10 µs
Reset Timeout Period tRP See Table 2 -10 tRP +10 %
Manual Reset Setup Delay tSU Internal timing (see Tables 1a, 1b, 1c) -10 tSU +10 %
Debounce Period tDB 18 20 22 ms
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Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Absolute Maximum Ratings
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.
Package Thermal Characteristics
Electrical Characteristics
(VCC = 1.6V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
Note 2: All parameters are production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUTS (RESET, SRESET)
RESET, SRESET Output Low VOL
VCC = VTH(MIN), VTH > 4.25V,
ISINK = 10mA 0.4 V
VCC = VTH(MIN), VTH > 2.5V,
ISINK = 3.2mA 0.4 V
VCC = VTH(MIN), VTH > 1.67V,
ISINK = 1mA 0.4 V
VCC = VTH(MIN), VTH > 1V, ISINK = 100µA 0.4 V
VCC > 0.95V, VCC falling, ISINK = 15µA 0.4 V
RESET, SRESET Output High
(Push-Pull Outputs) VOH
VCC > 0.95V, ISOURCE = 15µA 0.8 x VCC V
VCC > 1.2V, ISOURCE = 100µA 0.8 x VCC V
VCC > 1.67V, ISOURCE = 150µA 0.8 x VCC V
VCC > 2.7V, ISOURCE = 500µA 0.8 x VCC V
VCC > 4.5V, ISOURCE = 800µA 0.8 x VCC V
RESET, SRESET Output
Leakage Current (Open-Drain
Outputs)
1 µA
MANUAL RESET INPUTS (MR, MR1, MR2)
MR1, MR2, MR Input Voltage
Low VIL 0.3 x VCC V
MR1, MR2, MR Input Voltage
High VIH 0.7 x VCC V
Manual Reset Minimum Pulse
Width 1 µs
Manual Reset Glitch Rejection 100 ns
Manual Reset to Soft Reset
Delay tMRD 200 ns
MR1, MR2, MR Internal Pullup
Resistance 25 50 80 kΩ
SELECT (SEL) LOGIC INPUT
SEL Input Low Voltage 0.15 x VCC V
SEL Input High Voltage 0.85 x VCC V
SEL Input Leakage -8 +8 µA
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Electrical Characteristics (continued)
(VCC = 5V, MAX16125WTDB29+, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16122 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
5.55.04.0 4.52.5 3.0 3.52.0
2
3
4
5
6
7
8
9
10
1
1.5 6.0
TA = -40°C
TA = +125°C
TA = +25°C
TA = +85°C
MAXIMUM VCC TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX16122 toc04
RESET THRESHOLD OVERDRIVE (V)
MAXIMUM VCC TRANSIENT DURATION (µs)
0.200.150.100.05
2
4
6
8
10
12
14
0
0 0.25
MAX16125WTDB29+
VCC RESET THRESHOLD
vs. TEMPERATURE
MAX16122 toc05
TEMPERATURE (°C)
VCC RESET THRESHOLD (%)
1109580655035205-10-25
5
-5
-40 125
-4
-3
-2
-1
1
2
3
4
0
NORMALIZED TO TA = +25°C
MAX16125WTDB29+
SUPPLY CURRENT vs. TEMPERATURE
MAX16122 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
1109580655035205-10-25
2
4
6
8
10
0
-40 125
VCC = 3.3V
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX16122 toc03
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)
1109580655035205-10-25
1.95
2.00
2.05
2.10
1.90
-40 125
VCC = 3.0V
MAX16122–MAX16125 Dual Pushbutton Controllers in
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Typical Operating Characteristics
(VCC = 5V, MAX16125WTDB29+, TA = +25°C, unless otherwise noted.)
VCC TO RESET OUTPUT DELAY
vs. TEMPERATURE
MAX16122 toc06
TEMPERATURE (°C)
VCC TO RESET OUTPUT DELAY (µs)
1109580655035205-10-25
2
4
6
8
10
0
-40 125
VCC TO RESET DELAY
MAX16122 toc09
4µs/div
VTH + 100mV
100mV/div
RESET
2V/div
tSU vs. RSEL
MAX16122 toc10
SEL RESISTANCE TO GND (kΩ)
SETUP DELAY (s)
460410310 360110 160 210 26060
2
4
6
8
10
12
14
16
18
20
22
24
0
10
RESET OUTPUT-LOW VOLTAGE
vs. SINK CURRENT
MAX16122 toc07
SINK CURRENT (mA)
RESET VOL (V)
4.54.00.5 1.0 1.5 2.5 3.02.0 3.5
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0
0 5.0
VCC = 2.9V
VCC = 2.5V
VCC = 1.5V
PUSHBUTTON TIMING
MAX16122 toc08
tSU = 13.03µs
2s/div
MR1
2V/div
MAX16125WTDB29+
SRESET
2V/div
RESET
2V/div
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Typical Operating Characteristics (continued)
BUMP
NAME FUNCTION
MAX16122/
MAX16123
MAX16124/
MAX16125
A1 A1 RESET
Active-Low Reset Output. RESET is either an open-drain or a push-pull output (see the
Selector Guide). RESET asserts low when VCC drops below the selected threshold and
remains low for the VCC reset timeout period after VCC rises above the reset threshold.
The RESET one-shot asserts low for the reset timeout period when the manual reset
input is asserted longer than the setup delay. The open-drain output requires an external
pullup resistor.
— A2 SRESET Soft Reset Output. SRESET is the debounced version of MR.
B1 B1 SEL
Setup Delay Select Input. Connect SEL to VCC, GND, or leave unconnected to select
a desired setup delay (see Table 1a); or connect an external resistor between SEL and
GND to select a desired setup delay (E sufx only, see Tables 1a and 1b).
— B2 MR Manual Reset Input. Internal 50kΩ pullup to VCC. Pull MR low for the setup delay (tSU)
to one-shot pulse RESET for the reset timeout period.
TOP VIEW
BUMP SIDE DOWN
2
A
B
C
1
SEL
VCC GND
+
MAX16124/MAX16125
WLP
SRESET
MR
RESET
A
B
1 2
SEL
VCC GND
C
+
MAX16122/MAX16123
WLP
MR2
RESET
MR1
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Bump Description
Bump Congurations
Detailed Description
The MAX16122–MAX16125 low-current microprocessor
reset circuits feature single or dual manual reset inputs
with an extended setup period. The devices also feature
an internal comparator to monitor 5V, 3.3V, 2.5V, and 1.8V
supplies.
When the monitored supply voltage drops below the
specified threshold, the active-low RESET output asserts
low and remains low for the reset timeout period (tRP).
The RESET output is one-shot pulse asserted for the
reset timeout period. For applications that do not require
reset timeout period at startup, devices with that con-
figuration are offered. Supply voltage reset threshold is
selectable through part suffix, see Table 3.
Connect SEL to GND, VCC, or leave unconnected to
select the different setup delays (depending on part suffix,
see Table 1a), or connect to an external resistor to set the
setup delays (E suffix only, see Table 1b).
The MAX16124/MAX16125 have one manual reset input
(MR), one reset output (RESET), and one soft reset
output (SRESET). The MAX16122/MAX16123 have two
identical manual reset inputs (MR1 and MR2) and one
reset output (RESET). A deglitch block is connected to
each manual reset input to add a delay to the falling edge
with a fixed deglitch period of 20ms (tDB).
Resistor-Adjusted Setup Delay
For the MAX16122–MAX16125 with the E setup delay
suffix (MAX1612_WTE_+T), a resistor connected from
SEL to GND sets the setup delay. Table 1b shows com-
mon resistor values and the resulting setup delays. For
resistor values not in the table, use the following formula
to compute the setup delay:
SU
R
t
20
=
where R is the resistor value in kΩ and tSU is the result-
ing setup delay in seconds. For best results, use resistor
values between 10kΩ and 500kΩ.
Reset Output
The reset output is typically connected to the reset
input of a microprocessor (µP). A µP’s reset input starts
or restarts the FP in a known state. The MAX16122–
MAX16125 FP supervisory circuits provide the reset
logic to prevent code-execution errors during power-up,
power-down, and brownout conditions (see the Typical
Operating Characteristics).
The MAX16122/MAX16123 have a reset output RESET.
The MAX16124/MAX16125 have a reset output RESET
and a soft-reset output SRESET which is the debounced
“mirror image” of MR (see Figure 1a).
BUMP
NAME FUNCTION
MAX16122/
MAX16123
MAX16124/
MAX16125
C1 C1 VCC
Power-Supply Input. VCC provides power to the device and is also a monitored voltage.
When VCC drops below the selected threshold, RESET asserts low and remains low for
the reset timeout period after VCC rises above the threshold. Bypass VCC to GND with a
0.1µF capacitor.
C2 C2 GND Ground
B2 — MR1 Active-Low Manual Reset Input 1. Internal 50kΩ pullup to VCC. Pull both MR1 and MR2
low for the setup delay (tSU) to one-shot pulse RESET for the reset timeout period.
A2 — MR2 Active-Low Manual Reset Input 2. Internal 50kΩ pullup to VCC. Pull the MR2 and MR1
low for the setup delay (tSU) to one-shot pulse RESET for the reset timeout period.
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Pin Description (continued)
All reset outputs are either active-low open-drain or
active-low push-pull (see the Selector Guide). RESET
changes from high to low whenever the monitored voltage
VCC drops below the reset threshold voltage. Once VCC
exceeds its respective reset threshold voltage, RESET
remains low for the reset timeout period (tRP) and then
goes high. RESET is one-shot pulsed whenever selected
manual reset inputs are asserted longer than the setup
delay (tSU). RESET stays asserted for the normal reset
timeout period.
RESET is guaranteed to be in the proper output
logic state for VCC ≥ 0.95V. For applications requir-
ing valid reset logic when VCC is less than 0.95V,
see the Ensuring a Valid RESET Output Down to
VCC = 0V (Push-Pull RESET Output) section.
Manual Reset Input
Each device in the MAX16122–MAX16125 family includes
at least one manual reset input, which must be held logic-
low for an extended setup period (t
SU) before the RESET
output asserts. An internal pullup resistor is connected to
each manual reset input. When valid manual reset input
conditions/setup periods are met, the RESET output is
pulsed low for the reset timeout period (see Table 2).
Existing front-panel pushbutton switches (i.e., power-
on/-off, channel up/down, or mode select) can be used
to drive the manual reset inputs. The extended manual
reset setup period prevents nuisance system resets dur-
ing normal front-panel usage or resulting from inadvertent
short-term pushbutton closure.
The MAX16124/MAX16125 include a single manual reset
input (MR) and two reset outputs (RESET and SRESET).
The MAX16122/MAX16123 include two manual reset
inputs (MR1 and MR2) and one reset output, RESET. For
dual MR1 and MR2 devices, both inputs must be simulta-
neously pulled low and held for the extended setup period
(tSU) before the reset output is pulsed. The dual extended
setup provides greater protection from nuisance resets.
The MAX16122–MAX16125 RESET output is asserted
once for the reset timeout period after each valid manual
reset input condition. At least one manual reset input
must be released (go high) and then be driven low for
the extended setup period before RESET asserts again.
Internal timing circuitry debounces low-to-high manual
reset logic transitions, so no external circuitry is required.
Figure 1a. Reset Timing Diagram
tSU
tDB
tMRD
tRP
ONE-SHOT PULSE ON RESET
MR
RESET
*SRESET
(MR1 AND MR2)
GND
GND
*SRESET IS FOR MAX16124/MAX16125
( ) MR1 AND MR2 IS FOR MAX16122/MAX16123
GND
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Figure 1b. Timeout Periods at Startup
MR
RESET
*SRESET
*MAX16124/MAX16125 ONLY; NO RESET TIMEOUT PERIOD AT STARTUP
VCC
VTH
tRP
tDB
tSU
MR
RESET
*SRESET
VCC
VTH
tRP
tRP
tDB
tSU
*MAX16124/MAX16125 ONLY; RESET TIMEOUT PERIOD AT STARTUP
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Supply Voltage Monitor
The MAX16122–MAX16125 have an internal comparator
with a programmable trip threshold to monitor the sup-
ply voltage. The VCC monitoring thresholds are select-
able through the part number suffix (see the Ordering
Information and Table 3).
Applications Information
Falling VCC Transients
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX16122–
MAX16125 are relatively immune to short-duration fall-
ing VCC transients (glitches). The Typical Operating
Characteristics show the Maximum Transient Duration
vs. VCC Overdrive graph for which the MAX16122–
MAX16125 do not generate a reset pulse. This graph was
generated using a falling pulse applied to VCC starting
above the actual reset threshold and ending below the
threshold by the magnitude indicated (VCC overdrive).
The graph indicates the typical maximum pulse width that
a falling transient can have without initiating a reset pulse.
As the magnitude of the transient increases (go farther
below the reset threshold), the maximum allowable pulse
width decreases.
Ensuring a Valid RESET Output Down to
VCC = 0V (Push-Pull RESET Output)
The MAX16122–MAX16125 guarantee proper operation
down to VCC = 0.95V. In applications that require valid
reset levels down to VCC = 0V, add a pulldown resis-
tor between RESET and GND for the push-pull outputs
(MAX16122/MAX16124). The resistor sinks any stray
leakage currents, holding RESET low (Figure 2). The
resistor value used is not critical, but it must be small
enough not to overload the RESET output when VCC
is above the reset threshold. For most applications, use
100kΩ to 1MΩ. This scheme does not work with open-
drain outputs of the MAX16123/MAX16125.
Layout and Bypassing
Ensure 0.1µF (minimum) capacitance is connected from
VCC to GND.
Figure 2. Ensuring RESET Output to VCC = 0V
100kΩ
VCC
VCC
RESET
GND
MAX16122
MAX16124
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RSEL
SEL
GND
MAX16122
MAX16123
MR1
MR2
RESET RESET
INPUT
VCC
0.1µF
HOMEPWR VOL
UP
VOL
DN
I/0
VCC
µP
I/0
I/0
I/0
1.6V TO 5.5V
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Typical Operating Circuits (continued)
MAX16124/MAX16125
VCC
SEL
MR
VCC
VCC
1.23V
SETUP DELAY
SELECTOR
DEGLITCH
RESET TIMEOUT
PERIOD
MANUAL
RESET SETUP
DELAY
(tSU)
GND
RESET
SRESET
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Functional Diagrams
MAX16122/MAX16123
VCC
SEL
MR1
VCC
VCC
1.23V
SETUP DELAY
SELECTOR
DEGLITCH
DEGLITCH
GND
MR2
VCC
RESET TIMEOUT
PERIOD
MANUAL
RESET SETUP
DELAY
(tSU)
RESET
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Functional Diagrams (continued)
Table 1a. SEL Pin Connection Setup
Delays (tSU)
Table 1b. Resistor-Adjusted Setup
Delays (tSU)
Table 2. Reset Timeouts (tRP)
Table 3. VCC Reset Threshold Voltage
(VTH)
PART
SUFFIX
SETUP DELAYS (s)
SEL = GND SEL =
UNCONNECTED SEL = VCC
A 0.5 1 2
B 3 4 5
C 6 8 10
D 13 15 17
ESee Table 1b
RESISTOR (kΩ) SETUP DELAYS (s)
10 0.5
18 0.9
22 1.1
27 1.35
39 1.95
47 2.35
56 2.8
82 4.1
100 5
180 9
220 11
PART SUFFIX MINIMUM RESET TIMEOUT (ms)
A 0.9
B 1.8
C 3.6
D 7.2
E 14.4
F 28.8
G 57.6
H 86.4
I 115.2
J 172.8
K 230.4
L 259.2
M 345.6
N 460.8
O691.2
P 921.6
Q 1843.2
R 3686.4
S 7372.8
SUFFIX VCC RESET THRESHOLD
VOLTAGE (V) (typ)
00 No Monitoring
16 1.58
17 1.67
22 2.19
23 2.32
29 2.93
31 3.08
44 4.38
46 4.63
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Note: Insert the desired setup delay (A to Q, from Table 1a) into the blank following the letters WT. Insert the letter corresponding
to the desired minimum reset timeout period (A to S, from Table 2) into the blank following the setup delay suffix. Insert the two digit
number corresponding to the desired nominal reset threshold (from Table 3) into the blanks following the reset timeout suffix.
+Denotes a lead(Pb)-free/RoHS-compliant package. Devices are available only in lead-free packaging.
T = Tape and reel.
*Future product—Contact factory for availability.
Note: MAX16125WTDB29+T is a standard option. For additional options, please contact factory.
PART TEMP RANGE PIN-PACKAGE
MAX16122WT_ _ _ _+T* -40°C to +125°C 6 WLP
MAX16123WT_ _ _ _+T* -40°C to +125°C 6 WLP
MAX16124WT_ _ _ _+T* -40°C to +125°C 6 WLP
MAX16125WT_ _ _ _+T -40°C to +125°C 6 WLP
PART DUAL MANUAL
RESET INPUT SRESET SEL ACTIVE-LOW
RESET OUTPUT
MAX16122WT_ _ _ _+T √—√Push-pull
MAX16123WT_ _ _ _+T √—√ Open-drain
MAX16124WT_ _ _ _+T — √ √ Push-Pull
MAX16125WT_ _ _ _+T — √ √ Open-drain
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND PATTERN
NO.
WLP W61F0+1 21-0217
Refer to
Application
Note 1891
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Chip Information
PROCESS: BiCMOS
Ordering Information
Selector Guide
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.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 7/12 Initial release —
1 11/14 No /V OPNs in Ordering Information; removed automotive reference from
Applications section 1
2 4/16 Updated Electrical Characteristics table and text 7, 9
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 specications 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.
MAX16122–MAX16125 Dual Pushbutton Controllers in
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Revision History
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.
