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19-XXXX; Rev 0; 7/07
Low-Power Battery Backup
Circuits in Small µDFN Packages
General Description
The MAX16033–MAX16040 supervisory circuits reduce
the complexity and number of components required for
power-supply monitoring and battery control functions
in microprocessor (µP) systems. The devices signifi-
cantly improve system reliability and accuracy com-
pared to other ICs or discrete components. The
MAX16033–MAX16040 provide µP reset, backup-bat-
tery switchover, power-fail warning, watchdog, and
chip-enable gating features.
The MAX16033–MAX16040 operate from supply volt-
ages up to 5.5V. The factory-set reset threshold voltage
ranges from 2.32V to 4.63V. The devices feature a man-
ual-reset input (MAX16033/MAX16037), a watchdog
timer input (MAX16034/MAX16038), a battery-on output
(MAX16035/MAX16039), an auxiliary adjustable reset
input (MAX16036/MAX16040), and chip-enable gating
(MAX16033–MAX16036). Each device includes a
power-fail comparator and offers an active-low push-
pull reset or an active-low open-drain reset.
The MAX16033–MAX16040 are available in 2mm x
2mm, 8-pin or 10-pin µDFN packages and are fully
specified from -40°C to +85°C.
Features
o
Low 1.2V Operating Supply Voltage
o
Precision Monitoring of 5.0V, 3.3V, 3.0V, and 2.5V
Power-Supply Voltages
o
Independent Power-Fail Comparator
o
Debounced Manual-Reset Input
o
Watchdog Timer, 1.6s Timeout
o
Battery-On Output Indicator
o
Auxiliary User-Adjustable RESETIN
o
Low 13µA Quiescent Supply Current
o
Two Available Output Structures:
Active-Low Push-Pull Reset
Active-Low Open-Drain Reset
o
Active-Low Reset Valid Down to 1.2V
o
Power-Supply Transient Immunity
o
140ms (min) Reset Timeout Period
o
Small 2mm x 2mm, 8-pin and 10 pin
µDFN
Packages
MAX16033–MAX16040
IN
PART*
WATCHDOG
✓
✓
✓
✓
✓
✓
✓
✓
A
CEIN/CEOUT
R
TEMP RANGE
BATTON
✓
✓
Ordering Information
PIN-
PACKAGE
PKG
CODE
M
Applications
RESETIN
✓
✓
✓
✓
✓
✓
✓
✓
Portable/Battery-
Powered Equipment
POS Equipment
Critical µP/µC Power
Monitoring
Set-Top Boxes
Controllers
MAX16033LLB_
_+T
MAX16033PLB_ _+T
MAX16034LLB_
_+T
MAX16034PLB_ _+T
-40°C to +85°C 10 µDFN-10 L1022-1
-40°C to +85°C 10 µDFN-10 L1022-1
-40°C to +85°C 10 µDFN-10 L1022-1
-40°C to +85°C 10 µDFN-10 L1022-1
Computers
LI
Fax Machines
Industrial Control
Real-Time Clocks
Intelligent Instruments
MR
✓
PFI,
PFO
✓
Pin Configurations and Typical Operating Circuit are located
at end of data sheet.
R
E
Ordering Information continued on last page.
*These
parts offer a choice of reset threshold voltages. From the
Reset Threshold Ranges table, insert the desired threshold volt-
age code in the blank to complete the part number. See Selector
Guide for a listing of device features.
+Denotes
lead-free package.
PART
P
MAX16033_
MAX16034_
MAX16035_
MAX16036_
MAX16037_
MAX16038_
MAX16039_
MAX16040_
Note:
Replace “_” with L for push-pull or P for open-drain
RESET
and
PFO
outputs.
________________________________________________________________
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.
Y
8 µDFN-8
8 µDFN-8
8 µDFN-8
8 µDFN-8
Selector Guide
PIN-PACKAGE
10 µDFN-10
10 µDFN-10
10 µDFN-10
10 µDFN-10
Low-Power Battery Backup
Circuits in Small µDFN Packages
Ordering Information (continued)
PART*
MAX16035LLB_
_+T
MAX16035PLB_ _+T
MAX16036LLB_
_+T
MAX16036PLB_ _+T
MAX16037LLA_
_+T
MAX16037PLA_ _+T
MAX16038LLA_
_+T
MAX16038PLA_ _+T
MAX16039LLA_
_+T
MAX16039PLA_ _+T
MAX16040LLA_
_+T
MAX16040PLA_ _+T
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
SUFFIX
46
44
31
29
26
23
Reset Threshold Ranges
RESET THRESHOLD VOLTAGE (V)
MIN
4.50
4.25
3.00
2.85
2.55
2.25
TYP
4.63
4.38
3.08
2.93
2.63
2.32
MAX
4.75
4.50
3.15
3.00
2.70
2.38
MAX16033–MAX16040
-40°C to +85°C 10 µDFN-10 L1022-1
-40°C to +85°C 10 µDFN-10 L1022-1
-40°C to +85°C 10 µDFN-10 L1022-1
-40°C to +85°C 10 µDFN-10 L1022-1
-40°C to +85°C 8 µDFN-8
-40°C to +85°C 8 µDFN-8
-40°C to +85°C 8 µDFN-8
-40°C to +85°C 8 µDFN-8
-40°C to +85°C 8 µDFN-8
-40°C to +85°C 8 µDFN-8
-40°C to +85°C 8 µDFN-8
-40°C to +85°C 8 µDFN-8
L822-1
L822-1
L822-1
L822-1
L822-1
L822-1
L822-1
L822-1
A
PROCESS: BiCMOS
*These
parts offer a choice of reset threshold voltages. From the
Reset Threshold Ranges table, insert the desired threshold volt-
age code in the blank to complete the part number. See Selector
Guide for a listing of device features.
+Denotes
lead-free package.
P
R
E
______________________________________________________________________________________
LI
M
IN
19
R
Y
Chip Information
stm32/stm8
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