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PDF MAX16057 Data sheet ( Hoja de datos )

Número de pieza MAX16057
Descripción 125nA Supervisory Circuits
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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19-4686; Rev 0; 6/09
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125nA Supervisory Circuits with Capacitor-
Adjustable Reset and Watchdog Timeouts
General Description
The MAX16056–MAX16059 are ultra-low-current 125nA
(typ) microprocessor (µP) supervisory circuits that mon-
itor a single system supply voltage. These devices
assert an active-low reset signal whenever the VCC
supply voltage drops below the factory-trimmed reset
threshold, manual reset is pulled low, or the watchdog
timer runs out (MAX16056/MAX16058). The reset output
remains asserted for an adjustable reset timeout period
after VCC rises above the reset threshold. Factory-
trimmed reset threshold voltages are offered from
1.575V to 4.625V in approximately 100mV increments
(see Table 1).
These devices feature adjustable reset and watchdog
timeout using external capacitors. The MAX16056/
MAX16058 contain a watchdog timer with a watchdog
select input (WDS) that multiplies the watchdog timeout
period by 128. The MAX16057/MAX16059 do not have
the watchdog feature.
The MAX16056–MAX16059 are available in either push-
pull or open-drain output-type configurations (see the
Ordering Information and Selector Guide). These devices
are fully specified over the -40°C to +125°C automotive
temperature range. The MAX16056/MAX16058 are avail-
able in the 8-pin TDFN package, and the MAX16057/
MAX16059 are available in the 6-pin TDFN package.
Applications
Portable/Battery-Powered Equipment
PDAs/Cell Phones
MP3 Players/Pagers
Glucose Monitors/Patient Monitors
Metering/HVAC
Automotive Infotainment
Typical Operating Circuit appears at end of data sheet.
TOP VIEW
VCC WDS WDI SRT
8765
Features
o Ultra-Low 125nA (typ) Supply Current
o 1.1V to 5.5V Operating Supply Range
o Factory-Set Reset Threshold Options from 1.575V
to 4.625V in Approximately 100mV Increments
o Capacitor-Adjustable Reset Timeout
o Capacitor-Adjustable Watchdog Timeout
(MAX16056/MAX16058)
o Watchdog Timer Capacitor Open Detect Function
o Optional Watchdog Disable Function
(MAX16056/MAX16058)
o Manual Reset Input
o Guaranteed RESET Valid for VCC 1.1V
o Push-Pull or Open-Drain RESET Output Options
o Power-Supply Transient Immunity
o Small, 3mm x 3mm TDFN Package
Ordering Information
PART
PIN-
PACKAGE
RESET
OUTPUT
WATCH-
DOG
TIMER
MAX16056ATA_ _+T 8 TDFN-EP* Push-Pull
Yes
MAX16057ATT_ _+T 6 TDFN-EP* Push-Pull
No
MAX16058ATA_ _+T 8 TDFN-EP* Open-Drain Yes
MAX16059ATT_ _+T 6 TDFN-EP* Open-Drain No
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
“_ _” represents the two number suffix needed when ordering
the reset threshold voltage value (see Table 1).
Standard versions and their package top marks are shown in
Table 3 at the end of data sheet.
Pin Configurations
VCC N.C. SRT
65 4
MAX16056
MAX16058
*EP
1 234
RESET GND SWT MR
TDFN
*CONNECT EXPOSED PAD TO GND.
MAX16057
MAX16059
*EP
12
RESET GND
TDFN
3
MR
________________________________________________________________ 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.

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MAX16057 pdf
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125nA Supervisory Circuits with Capacitor-
Adjustable Reset and Watchdog Timeouts
Typical Operating Characteristics (continued)
(VCC = 2.5V, TA = +25°C, unless otherwise noted.)
RESET OUTPUT-LOW VOLTAGE
vs. SINK CURRENT
0.30
RESET OUTPUT-HIGH VOLTAGE
vs. SOURCE CURRENT
0.50
0.45
0.25
VCC = 2.5V
0.40
0.20
VCC = 1.8V
0.15
0.35
0.30 VCC = 1.8V
0.25
0.20
0.10
VCC = 3.3V
0.15
VCC = 3.3V
0.05
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
ISINK (mA)
0.10 VCC = 2.5V
0.05
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
ISOURCE (mA)
MANUAL RESET DELAY
vs. TEMPERATURE
270
268
266
264
262
260
258
256
254
252
250
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (NC)
SUPPLY CURRENT vs. WATCHDOG
SWITCHING FREQUENCY
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.01 0.1 1 10 100 1000 10,000
WATCHDOG SWITCHING FREQUENCY (kHz)
MANUAL RESET DELAY
MAX16056 toc13
MR
1V/div
RESET
1V/div
200ns/div
RESET SINK CAPABILITY
vs. SUPPLY VOLTAGE
10
9 VRESET = 0.3V
8
7
6
5
4
3
2
1
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
VCC (V)
RESET SOURCE CAPABILITY
vs. SUPPLY VOLTAGE
4.0
VRESET = 0.8 x VCC
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VCC (V)
_______________________________________________________________________________________ 5

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MAX16057 arduino
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125nA Supervisory Circuits with Capacitor-
Adjustable Reset and Watchdog Timeouts
Interfacing to Other Voltages
for Logic Compatibility
The open-drain RESET output can be used to interface
to a µP with other logic levels. The open-drain output is
connected to a voltage from 0V to 5.5V as shown in
Figure 5. Generally, the pullup resistor connected to
RESET connects to the supply voltage that is being
monitored at the device’s VCC input. However, some
systems use the open-drain output to level-shift from
the supervisor’s monitored supply to another supply
voltage. As the supervisor’s VCC decreases, so does
the device’s ability to sink current at RESET.
Ensuring a Valid RESET Down to VCC = 0V
(Push-Pull RESET)
When VCC falls below 1.1V, the current-sinking capabil-
ity of RESET decreases drastically. The high-imped-
ance CMOS logic inputs connected to RESET can drift
to undetermined voltages. This presents no problems in
most applications, since most µPs and other circuitry
do not operate with VCC below 1.1V. In those applica-
tions where RESET must be valid down to 0, add a pull-
down resistor between the MAX16056/MAX16057
push-pull RESET output and GND. The resistor sinks
any stray leakage currents, holding RESET low (Figure
6). Choose a pulldown resistor that accommodates
leakages, such that RESET is not significantly loaded
and is capable of pulling to GND. The external pull-
down cannot be used with the open-drain RESET out-
put of the MAX16058/MAX16059.
5V
VCC
MAX16058
MAX16059
RESET
3.3V
VCC
100k
µP
RESET
GND GND
Figure 5. Interfacing with Other Voltage Levels
VCC
MAX16056
MAX16057
RESET
GND
VCC
2M
Figure 6. Ensuring RESET Valid to VCC = GND
______________________________________________________________________________________ 11

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