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3-Pin Microprocessor Reset Circuits
General Description
The MAX803/MAX809/MAX810 are microprocessor (µP)
supervisory circuits used to monitor the power supplies
in µP and digital systems. They provide excellent circuit
reliability and low cost by eliminating external compo-
nents and adjustments when used with +5V, +3.3V,
+3.0V, or +2.5V powered circuits.
These circuits perform a single function: they assert a
reset signal whenever the V
CC
supply voltage declines
below a preset threshold, keeping it asserted for at
least 140ms after V
CC
has risen above the reset thresh-
old. Reset thresholds suitable for operation with a vari-
ety of supply voltages are available.
The MAX803 has an open-drain output stage, while the
MAX809/MAX810 have push-pull outputs. The
MAX803’s open-drain
RESET
output requires a pull-up
resistor that can be connected to a voltage higher than
V
CC
. The MAX803/MAX809 have an active-low
RESET
output, while the MAX810 has an active-high RESET
output. The reset comparator is designed to ignore fast
transients on V
CC
, and the outputs are guaranteed to
be in the correct logic state for V
CC
down to 1V.
Low supply current makes the MAX803/MAX809/
MAX810 ideal for use in portable equipment. The
MAX803 is available in a 3-pin SC70 package, and the
MAX809/MAX810 are available in 3-pin SC70 or SOT23
packages.
____________________________Features
♦
Precision Monitoring of +2.5V, +3V, +3.3V, and
+5V Power-Supply Voltages
♦
Fully Specified Over Temperature
♦
Available in Three Output Configurations
Open-Drain
RESET
Output (MAX803)
Push-Pull
RESET
Output (MAX809)
Push-Pull RESET Output (MAX810)
♦
140ms min Power-On Reset Pulse Width
♦
12µA Supply Current
♦
Guaranteed Reset Valid to V
CC
= +1V
♦
Power Supply Transient Immunity
♦
No External Components
♦
3-Pin SC70 and SOT23 Packages
MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z
Ordering Information
PART
MAX803_EXR-T
MAX803_EXR-T10
MAX809_EXR-T
MAX809_EXR-T10
MAX809_EUR-T
MAX809_EUR-T10
MAX810_EXR-T
MAX810_EXR-T10
MAX810_EUR-T
MAX810_EUR-T10
TEMP. RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +105°C
-40°C to +105°C
-40°C to +125°C
-40°C to +125°C
-40°C to +105°C
-40°C to +105°C
PIN-PACKAGE
3 SC70-3
3 SC70-3
3 SC70-3
3 SC70-3
3 SOT23-3
3 SOT23-3
3 SC70-3
3 SC70-3
3 SOT23-3
3 SOT23-3
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Note:
These parts are offered in 2.5k or 10k reels, and must be
ordered in 2.5k or 10k increments. Order MAX803_EXR-T for
2.5k reels and MAX803_EXR-T10 for 10k reels. Insert the
desired suffix letter from the Selector Guide into the blank to
complete the part number. All versions of these products may
not be available at the time of announcement. Contact factory for
availability.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Typical Operating Circuit
V
CC
V
CC
R
PULL-UP
*
V
CC
Pin Configuration
TOP VIEW
GND
1
MAX803
MAX809
RESET
RESET
INPUT
µP
MAX803
MAX809
MAX810
3
V
CC
GND
GND
RESET (RESET)
2
*MAX803 ONLY
( ) ARE FOR MAX810.
MAX803 AVAILABLE IN SC70-3 ONLY.
SC70-3/SOT23-3
________________________________________________________________
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.
3-Pin Microprocessor Reset Circuits
MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
V
CC
....................................................................-0.3V to +6.0V
RESET,
RESET
(push-pull) .....................-0.3V to (V
CC
+ 0.3V)
RESET
(open drain)...........................................-0.3V to +6.0V
Input Current, V
CC
..............................................................20mA
Output Current, RESET,
RESET
..........................................20mA
Rate of Rise, V
CC
............................................................100V/µs
Continuous Power Dissipation (T
A
= +70°C)
3-Pin SC70 (derate 2.17mW/°C above +70°C) ............174mW
3-Pin SOT23 (derate 4mW/°C above +70°C)...............320mW
Operating Temperature Range
3-Pin SC70 .....................................................-40°C to +125°C
3-Pin SOT23...................................................-40°C to +105°C
Storage Temperature Range .............................-65°C to +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
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= full range, T
A
= -40°C to +105°C (SOT23) or T
A
= -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
A
=
+25°C, V
CC
= 5V for L/M/J versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, and V
CC
= 2.5V for Z version.) (Note 1)
PARAMETER
V
CC
Range
SYMBOL
CONDITIONS
T
A
= 0°C to +70°C
T
A
= -40°C to +105°C (MAX8_ _ _EUR)
T
A
= -40°C to +125°C (MAX8_ _ _EXR)
T
A
= -40°C
to +85°C
Supply Current (SOT23)
I
CC
T
A
= +85°C
to +105°C
T
A
= -40°C
to +85°C
Supply Current (SC70)
I
CC
T
A
= +85°C
to +125°C
MAX8_ _L
V
CC
< 5.5V, MAX8_ _L/M
V
CC
< 3.6V, MAX8_ _R/S/T/Z
V
CC
< 5.5V, MAX8_ _L/M
V
CC
< 3.6V, MAX8_ _R/S/T/Z
V
CC
< 5.5V, MAX8_ _L/M
V
CC
< 3.6V, MAX8_ _R/S/T/Z
V
CC
< 5.5V, MAX8_ _L/M
V
CC
< 3.6V, MAX8_ _R/S/T/Z
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
MAX8_ _M
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
MAX809J
(SOT only)
Reset Threshold
(SOT only)
V
TH
MAX8_ _T
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
MAX8_ _S
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
MAX8_ _R
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
4.56
4.50
4.40
4.31
4.25
4.16
3.93
3.89
3.80
3.04
3.00
2.92
2.89
2.85
2.78
2.59
2.55
2.50
2.63
2.93
3.08
4.00
4.38
4.63
24
17
MIN
1.0
1.2
1.2
24
17
TYP
MAX
5.5
5.5
5.5
60
50
100
100
35
30
60
60
4.70
4.75
4.86
4.45
4.50
4.56
4.06
4.10
4.20
3.11
3.15
3.23
2.96
3.00
3.08
2.66
2.70
2.76
V
µA
V
UNITS
2
_______________________________________________________________________________________
3-Pin Microprocessor Reset Circuits
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= full range, T
A
= -40°C to +105°C (SOT23) or T
A
= -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
A
=
+25°C, V
CC
= 5V for L/M/J versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, and V
CC
= 2.5V for Z version.) (Note 1)
PARAMETER
SYMBOL
MAX8_ _L
CONDITIONS
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
MAX8_ _M
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
MAX8_ _T
Reset Threshold
(SC70 only)
V
TH
MAX8_ _S
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
T
A
= +25°C
MAX8_ _R
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
MAX8_ _Z
(SC70 only)
Reset Threshold Tempco
V
CC
to Reset Delay (Note 2)
Reset Active Timeout Period
(SOT23)
Reset Active Timeout Period
(SC70)
V
CC
= V
TH
to (V
TH
- 100 mV)
T
A
= -40°C to +85°C
T
A
= +85°C to +105°C
T
A
= -40°C to +85°C
T
A
= +85°C to +125°C
V
CC
= V
TH
min, I
SINK
= 1.2mA,
MAX803R/S/T/Z, MAX809R/S/T/Z
V
OL
V
CC
= V
TH
min, I
SINK
= 3.2mA,
MAX803L/M, MAX809J/L/M
V
CC
> 1.0V, I
SINK
= 50µA
RESET
Output Voltage High
(push-pull active low MAX809)
V
CC
> V
TH
max, I
SOURCE
= 500µA,
MAX803R/S/T/Z, MAX809R/S/T/Z
V
OH
V
CC
> V
TH
max, I
SOURCE
= 800µA,
MAX803L/M, MAX809J/L/M
V
CC
= V
TH
max, I
SINK
= 1.2mA,
MAX810R/S/T/Z
V
OL
V
CC
= V
TH
max, I
SINK
= 3.2mA,
MAX810L/M
0.8V
CC
V
V
CC
- 1.5
0.3
V
0.4
140
100
140
100
240
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
MIN
4.56
4.50
4.44
4.31
4.25
4.20
3.04
3.00
2.95
2.89
2.85
2.81
2.59
2.55
2.52
2.28
2.25
2.22
30
20
240
560
840
460
840
0.3
0.4
0.3
V
2.32
2.63
2.93
3.08
4.38
TYP
4.63
MAX
4.70
4.75
4.82
4.45
4.50
4.56
3.11
3.15
3.21
2.96
3.00
3.05
2.66
2.70
2.74
2.35
2.38
2.42
ppm/°C
µs
ms
ms
V
UNITS
MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z
RESET
Output Voltage Low (push-
pull active low and open-drain
active low, MAX803 and MAX809)
RESET Output Voltage Low (push-
pull active high, MAX810)
_______________________________________________________________________________________
3
3-Pin Microprocessor Reset Circuits
MAX803L/M/R/S/T/Z, MAX809J/L/M/R/S/T/Z, MAX810L/M/R/S/T/Z
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= full range, T
A
= -40°C to +105°C (SOT23) or T
A
= -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
A
=
+25°C, V
CC
= 5V for L/M/J versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, and V
CC
= 2.5V for Z version.) (Note 1)
PARAMETER
RESET Output Voltage High
(push-pull active high, MAX810)
RESET Open-Drain Output
Leakage Current (MAX803)
(Note 3)
SYMBOL
V
OH
CONDITIONS
1.8V < V
CC
< V
TH
min, I
SOURCE
= 150µA
MIN
0.8V
CC
TYP
MAX
UNITS
V
V
CC
> V
TH
, RESET deasserted
1
µA
Note 1:
Production testing done at T
A
= +25°C; limits over temperature guaranteed by design only.
Note 2:
RESET
output for MAX803/MAX809; RESET output for MAX810.
Note 3:
Guaranteed by design, not production tested.
Typical Operating Characteristics
(V
CC
= full range, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at T
A
= +25°C, V
CC
= +5V for L/M/J versions,
V
CC
= +3.3V for T/S versions, V
CC
= +3V for R version, and V
CC
= +2.5V for Z version.)
SUPPLY CURRENT vs. TEMPERATURE
(SC70 PACKAGE, NO LOAD)
MAX803 toc01
POWER-DOWN RESET DELAY vs.
TEMPERATURE (MAX8_ _R/S/T/Z)
MAX803-TOC3
POWER-DOWN RESET DELAY vs.
TEMPERATURE (MAX8_ _J/L/M)
V
OD
= V
TH
- V
CC
V
OD
= 10mV
MAX803-TOC4
15
100
POWER-DOWN RESET DELAY (µs)
V
OD
= V
TH
- V
CC
V
OD
= 10mV
140
POWER-DOWN RESET DELAY (µs)
120
100
80
60
40
20
MAX8_ _L/M, V
CC
= 5V
SUPPLY CURRENT (µA)
10
MAX8_ _R/S/T, V
CC
= 3.3V
MAX8_ _Z, V
CC
= 2.5V
5
80
60
V
OD
= 20mV
40
V
OD
= 20mV
20
0
V
OD
= 100mV
V
OD
= 200mV
-40
-20
20
0
40
TEMPERATURE (°C)
60
85
V
OD
= 100mV
V
OD
= 200mV
-40
-20
20
0
40
TEMPERATURE (°C)
60
85
MAX8_ _L/M/R/S/T/Z, V
CC
= 1V
0
-40
-20
0
20
40
60
85
TEMPERATURE (°C)
0
40
250
POWER-UP RESET TIMEOUT (ms)
POWER-UP RESET TIMEOUT
vs. TEMPERATURE
MAX803-TOC5
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX803-TOC6
1.003
1.002
NORMALIZED THRESHOLD
1.001
1.000
0.999
0.998
0.997
245
MAX8_ _J/L/M
240
MAX8_ _R/S/T/Z
235
230
225
-40
-20
0
20
40
60
85
TEMPERATURE (°C)
-40
-20
0
20
40
60
85
TEMPERATURE (°C)
4
_______________________________________________________________________________________
