MAX6729A Datasheet PDF - Maxim Integrated Products

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MAX6729A
Maxim Integrated Products

Part Number MAX6729A
Description SOT23 uP Supervisory Circuits
Page 20 Pages


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19-0536; Rev 1; 7/06
Dual/Triple, Ultra-Low-Voltage, SOT23 µP
Supervisory Circuits
General Description
The MAX6715A–MAX6729A are ultra-low-voltage micro-
processor (µP) supervisory circuits designed to monitor two
or three system power-supply voltages. These devices
assert a system reset if any monitored supply falls below its
factory-trimmed or adjustable threshold and maintain reset
for a minimum timeout period after all supplies rise above
their thresholds. The integrated dual/triple supervisory cir-
cuits significantly improve system reliability and reduce size
compared to separate ICs or discrete components.
www.DTahteasSehedeet4vUic.ceosmmonitor primary supply voltages (VCC1)
from 1.8V to 5.0V and secondary supply voltages (VCC2)
from 0.9V to 3.3V with factory-trimmed reset threshold
voltage options (see the Reset Voltage Threshold Suffix
Guide). An externally adjustable RSTIN input option
allows customers to monitor a third supply voltage down
to 0.62V. These devices are guaranteed to be in the cor-
rect reset output logic state when either VCC1 or VCC2
remains greater than 0.8V.
A variety of push-pull or open-drain reset outputs along
with watchdog input, manual reset input, and power-fail
input/output features are available (see the Selector
Guide). Select reset timeout periods from 1.1ms to
1120ms (min) (see the Reset Timeout Period Suffix
Guide). The MAX6715A–MAX6729A are available in small
5-, 6-, and 8-pin SOT23 packages and operate over the
-40°C to +125°C temperature range.
Applications
Multivoltage Systems
Telecom/Networking
Equipment
Computers/Servers
Portable/Battery-
Operated Equipment
Industrial Equipment
Printers/Fax Machines
Set-Top Boxes
Typical Operating Circuit
UNREGULATED
DC
R1
R2
IN
DC/DC OUT2
CONVERTER
OUT1
VCC1
VCC2
PUSHBUTTON
SWITCH
MAX6715A-
MAX6729A RST
RSTIN/PFI
WDI
MR PFO
MAX67_ _
1.8V 0.9V
I/O CORE
SUPPLY SUPPLY
RESET
I/O µP
NMI
Features
VCC1 (Primary Supply) Reset Threshold Voltages
from 1.58V to 4.63V
VCC2 (Secondary Supply) Reset Threshold
Voltages from 0.79V to 3.08V
Externally Adjustable RSTIN Threshold for
Auxiliary/Triple-Voltage Monitoring
(0.62V Internal Reference)
Watchdog Timer Option
35s (min) Long Startup Period
1.12s (min) Normal Timeout Period
Manual Reset Input Option
Power-Fail Input/Power-Fail Output Option
(Push-Pull and Open-Drain Active-Low)
Guaranteed Reset Valid Down to VCC1 or
VCC2 = 0.8V
Reset Output Logic Options
Immune to Short VCC Transients
Low Supply Current 14µA (typ) at 3.6V
Watchdog Disable Feature
Small 5-, 6-, and 8-Pin SOT23 Packages
Ordering Information
PART
TEMP
RANGE
MAX6715AUT_ _D_+T -40°C +125°C
MAX6716AUT_ _D_+T -40°C +125°C
MAX6717AUK_ _D_+T -40°C +125°C
MAX6718AUK_ _D_+T -40°C +125°C
MAX6719AUT_ _D_+T -40°C +125°C
MAX6720AUT_ _D_+T -40°C +125°C
+Denotes lead-free package.
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
5 SOT23-5
5 SOT23-5
6 SOT23-6
6 SOT23-6
PKG
CODE
U6-1
U6-1
U5-1
U5-1
U6-1
U6-1
Note: The first “_ _” are placeholders for the threshold voltage
levels of the devices. Desired threshold levels are set by the part
number suffix found in the Reset Voltage Threshold Suffix Guide.
The “_” after the D is a placeholder for the reset timeout delay
time. Desired delay time is set using the timeout period suffix
found in the Reset Timeout Period Suffix Guide. For example, the
MAX6716AUTLTD3-T is a dual-voltage supervisor VTH1 =
4.625V, VTH2 = 3.075V, and 210ms (typ) timeout period.
Ordering Information continued at end of data sheet.
Pin Configurations and Selector Guide appear at end of
data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.



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Dual/Triple, Ultra-Low-Voltage, SOT23 µP
Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
VCC1, VCC2 ..........................................................-0.3V to +6V
Open-Drain RST, RST1, RST2, PFO, RST ................-0.3V to +6V
Push-Pull RST, RST1, PFO, RST...............-0.3V to (VCC1 + 0.3V)
Push-Pull RST2 .........................................-0.3V to (VCC2 + 0.3V)
RSTIN, PFI, MR, WDI ................................................-0.3V to +6V
Input Current/Output Current (all pins) ...............................20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) ........571mW
6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) ........696mW
8-Pin SOT23-8 (derate 8.9mW/°C above +70°C) ........714mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
www.DaabstoaluStheemeatx4iUm.ucmomrating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
VCC1 Reset Threshold
VCC2 Reset Threshold
SYMBOL
VCC
ICC1
ICC2
VTH1
VTH2
CONDITIONS
VCC1 < 5.5V all I/O connections open,
outputs not asserted
VCC1 < 3.6V all I/O connections open,
outputs not asserted
VCC2 < 3.6V all I/O connections open,
outputs not asserted
VCC2 < 2.75V all I/O connections open,
outputs not asserted
L (falling)
M (falling)
T (falling)
S (falling)
R (falling)
Z (falling)
Y (falling)
W (falling)
V (falling)
T (falling)
S (falling)
R (falling)
Z (falling)
Y (falling)
W (falling)
V (falling)
I (falling)
H (falling)
G (falling)
F (falling)
E (falling)
D (falling)
MIN TYP MAX UNITS
0.8 5.5 V
15 39
10 28
µA
4 11
4.500
4.250
3.000
2.850
2.550
2.250
2.125
1.620
1.530
3.000
2.850
2.550
2.250
2.125
1.620
1.530
1.350
1.275
1.080
1.020
0.810
0.765
3
4.625
4.375
3.075
2.925
2.625
2.313
2.188
1.665
1.575
3.075
2.925
2.625
2.313
2.188
1.665
1.575
1.388
1.313
1.110
1.050
0.833
0.788
9
4.750
4.500
3.150
3.000
2.700
2.375
2.250
1.710
1.620
3.150
3.000
2.700
2.375
2.250
1.710
1.620
1.425
1.350
1.140
1.080
0.855
0.810
V
V
2 _______________________________________________________________________________________



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Dual/Triple, Ultra-Low-Voltage, SOT23 µP
Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Reset Threshold Tempco
Reset Threshold Hysteresis
VCC to Reset Output Delay
www.DataSheet4U.com
Reset Timeout Period
VTH/°C
VHYST
tRD
tRP
Referenced to VTH typical
VCC1 = (VTH1+ 100mV) to (VTH1 - 100mV) or
VCC2 = (VTH2 + 75mV) to (VTH2 - 75mV)
D1
D2
D3
D5
20 ppm/°C
0.5 %
20 µs
1.1 1.65 2.2
8.8 13.2 17.6
140 210 280
280 420 560
ms
D6 560
D4 1120
ADJUSTABLE RESET COMPARATOR INPUT (MAX6719A/MAX6720A/MAX6723A–MAX6727A)
RSTIN Input Threshold
VRSTIN
611
RSTIN Input Current
IRSTIN
-100
840
1680
626.5
1120
2240
642
+100
mV
nA
RSTIN Hysteresis
3 mV
RSTIN to Reset Output Delay
tRSTIND VRSTIN to (VRSTIN - 30mV)
POWER-FAIL INPUT (MAX6728A/MAX6729A)
PFI Input Threshold
VPFI
PFI Input Current
IPFI
PFI Hysteresis
VPFH
PFI to PFO Delay
tDPF
(VPFI + 30mV) to (VPFI - 30mV)
MANUAL RESET INPUT (MAX6715A–MAX6722A/MAX6725A–MAX6729A)
MR Input Voltage
MR Minimum Pulse Width
MR Glitch Rejection
MR to Reset Delay
MR Pullup Resistance
VIL
VIH
tMR
WATCHDOG INPUT (MAX6721A–MAX6729A)
Watchdog Timeout Period
First watchdog period after reset timeout
tWD period
Normal mode
WDI Pulse Width
WDI Input Voltage
WDI Input Current
tWDI
VIL
VIH
IWDI
(Note 2)
WDI = 0V or VCC1
22 µs
611
-100
626.5
3
2
642
+100
mV
nA
mV
µs
0.7 VCC1
0.3 VCC1
1
100
200
25 50 80
V
µs
ns
ns
k
35 54 72
1.12 1.68 2.24
50
0.3 VCC1
0.7 VCC1
-1 +1
s
ns
V
µA
_______________________________________________________________________________________ 3



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Dual/Triple, Ultra-Low-Voltage, SOT23 µP
Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
RESET/POWER-FAIL OUTPUTS
VCC1 or VCC2 0.8V, ISINK = 1µA,
output asserted
0.3
RST/RST1/RST2/PFO
www.DaO(PtuautsSphhu-etPeLutOl4l WUor.cOopmen-Drain)
VCC1 or VCC2 1.0V, ISINK = 50µA,
output asserted
VOL
VCC1 or VCC2 1.2V, ISINK = 100µA,
output asserted
VCC1 or VCC2 2.7 V, ISINK = 1.2mA,
output asserted
0.3
0.3 V
0.3
RST/RST1/PFO
Output HIGH
(Push-Pull Only)
VOH
VCC1 or VCC2 4.5V, ISINK = 3.2mA,
output asserted
VCC1 1.8V, ISOURCE = 200µA, output not
asserted
VCC1 2.7V, ISOURCE = 500µA, output not
asserted
VCC1 4.5V, ISOURCE = 800µA, output not
asserted
0.8 VCC1
0.8 VCC1
0.8 VCC1
0.4
V
RST2
Output HIGH
(Push-Pull Only)
RST
Output HIGH
(Push-Pull Only)
VOH
VOH
VCC1 1.8V, ISOURCE = 200µA, output not
asserted
VCC1 2.7V, ISOURCE = 500µA, output not
asserted
VCC1 4.5V, ISOURCE = 800µA, output not
asserted
VCC1 1.0V, ISOURCE = 1µA, reset asserted
VCC1 1.8V, ISOURCE = 150µA,
reset asserted
VCC1 2.7V, ISOURCE = 500µA,
reset asserted
0.8 VCC2
0.8 VCC2
0.8 VCC2
0.8 VCC1
0.8 VCC1
0.8 VCC1
V
V
VCC1 4.5V, ISOURCE = 800µA,
reset asserted
0.8 VCC1
RST
Output LOW
(Push-Pull or Open Drain)
RST/RST1/RST2/PFO Output
Open-Drain Leakage Current
VCC1 or VCC2 1.8V, ISINK = 500µA,
reset not asserted
VOL
VCC1 or VCC2 2.7V, ISINK = 1.2mA,
reset not asserted
VCC1 or VCC2 4.5V, ISINK = 3.2mA,
reset not asserted
Output not asserted
0.3
0.3 V
0.4
0.5 µA
RST Output Open-Drain
Leakage Current
Output asserted
0.5 µA
Note 1: Devices tested at +25°C. Overtemperature limits are guaranteed by design and not production tested.
Note 2: Parameter guaranteed by design.
4 _______________________________________________________________________________________



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