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MAX803 Series,
NCP803 Series
Very Low Supply Current
3-Pin Microprocessor
Reset Monitor
The MAX803/NCP803 is a cost−effective system supervisor circuit
designed to monitor V
CC
in digital systems and provide a reset signal to
the host processor when necessary. No external components are
required.
The reset output is driven active within 10
msec
of V
CC
falling
through the reset voltage threshold. Reset is maintained active for a
timeout period which is trimmed by the factory after V
CC
rises above
the reset threshold. The MAX803/NCP803 has an open drain
active−low RESET output. Both devices are available in SOT−23 and
SC−70 packages.
The MAX803/NCP803 is optimized to reject fast transient glitches
on the V
CC
line. Low supply current of 0.5
mA
(V
CC
= 3.2 V) make
these devices suitable for battery powered applications.
Features
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MARKING
DIAGRAM
3
1
2
SC−70
(SOT−323)
CASE 419
1
xxx
M
G
= Specific Device Code
= Date Code
= Pb−Free Package
SOT−23
(TO−236)
CASE 318
3
xxx MG
G
1
2
xx MG
G
•
Precision V
CC
Monitor for 1.5 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V
•
•
•
•
•
•
•
•
•
•
•
•
Supplies
Precision Monitoring Voltages from 1.2 V to 4.9 V Available
in 100 mV Steps
Four Guaranteed Minimum Power−On Reset Pulse Width Available
(1 ms, 20 ms, 100 ms, and 140 ms)
RESET Output Guaranteed to V
CC
= 1.0 V
Low Supply Current
V
CC
Transient Immunity
No External Components
Wide Operating Temperature:
−40°C
to 105°C
Pb−Free Packages are Available
Computers
Embedded Systems
Battery Powered Equipment
Critical Microprocessor Power Supply Monitoring
V
CC
V
CC
C = 100 nF
MAX803
NCP803
RESET
GND
0
V
CC
mP
RESET
GND
0
(Note: Microdot may be in either location)
PIN CONFIGURATION
GND
1
3
RESET
2
SOT−23/SC−70
(Top View)
V
CC
Typical Applications
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 7 of this data sheet.
R
pull−up
Figure 1. Typical Application Diagram
©
Semiconductor Components Industries, LLC, 2009
February, 2009
−
Rev. 6
1
Publication Order Number:
MAX803/D
MAX803 Series, NCP803 Series
3
V
CC
Timeout
Counter
Oscillator
2
RESET
Vref
1 GND
Figure 2. NCP803, MAX803 Series Open−Drain Active−Low Output
PIN DESCRIPTION
Pin No.
1
2
3
Symbol
GND
Ground
Description
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á
RESET
V
CC
RESET output remains low while V
CC
is below the reset voltage threshold, and for a reset timeout
period after V
CC
rises above reset threshold.
Supply Voltage: C = 100 nF is recommended as a bypass capacitor between V
CC
and GND.
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage (V
CC
to GND)
RESET Output Voltage (CMOS)
Input Current, V
CC
Output Current, RESET
dV/dt (V
CC
)
Rating
Symbol
V
CC
Value
Unit
V
V
mA
mA
−0.3
to 6.0
−0.3
to (V
CC
+ 0.3)
20
20
100
V/msec
°C/W
°C
°C
°C
V
Thermal Resistance, Junction−to−Air (Note 1)
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 Seconds)
SOT−23
SC−70
R
qJA
T
J
T
stg
T
sol
301
314
−40
to +105
−65
to +150
+260
2000
200
ESD Protection
Human Body Model (HBM): Following Specification JESD22−A114
Machine Model (MM): Following Specification JESD22−A115
Latchup Current Maximum Rating: Following Specification JESD78 Class II
Positive
Negative
I
Latchup
200
200
mA
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This based on a 35x35x1.6mm FR4 PCB with 10mm
2
of 1 oz copper traces under natural convention conditions and a single component
characterization.
2. The maximum package power dissipation limit must not be exceeded.
TJ(max)
*
TA
with T
J(max)
= 150°C
PD
+
R
qJA
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2
MAX803 Series, NCP803 Series
ELECTRICAL CHARACTERISTICS
T
A
=
−40°C
to +105°C unless otherwise noted. Typical values are at T
A
= +25°C. (Note 3)
Characteristic
V
CC
Range
T
A
= 0°C to +70°C
T
A
=
−40°C
to +105°C
Supply Current
V
CC
= 3.3 V
T
A
=
−40°C
to +85°C
T
A
= 85°C to +105°C
V
CC
= 5.5 V
T
A
=
−40°C
to +85°C
T
A
= 85°C to +105°C
Reset Threshold (V
in
Decreasing) (Note 4)
MAX803SQ463/NCP803SN463
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
MAX803SQ438/NCP803SN438
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
NCP803SN400
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
MAX803SQ308/NCP803SN308
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
MAX803SQ293/NCP803SN293
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
NCP803SN263
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
NCP803SN232
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
NCP803SN160
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
MAX803SN120, MAX803SQ120
T
A
= +25°C
T
A
=
−40°C
to +85°C
T
A
= +85°C to +105°C
Detector Voltage Threshold Temperature Coefficient
V
CC
to Reset Delay V
CC
= V
TH
to (V
TH
−
100 mV)
Reset Active TimeOut Period (Note 5)
MAX803SN(Q)293D1
MAX803SN(Q)293D2/MAX803SN(Q)308D2
MAX803SN(Q)293D3
MAX803SN(Q)293
RESET Output Voltage Low
V
CC
= V
TH
−
0.2 V
1.6 V
v
V
TH
v
2.0 V, I
SINK
= 0.5 mA
2.1 V
v
V
TH
v
4.0 V, I
SINK
= 1.2 mA
4.1 V
v
V
TH
v
4.9 V, I
SINK
= 3.2 mA
RESET Leakage Current V
CC
u
V
TH
, RESET De−asserted
I
CC
−
−
−
−
V
TH
4.56
4.51
4.40
4.31
4.27
4.16
3.94
3.90
3.80
3.04
3.00
2.92
2.89
2.85
2.78
2.59
2.55
2.50
2.29
2.26
2.20
1.58
1.56
1.52
1.18
1.17
1.14
−
−
t
RP
1.0
20
100
140
−
4.63
−
−
4.38
4.70
4.75
4.88
4.45
4.49
4.60
4.06
4.10
4.20
3.11
3.15
3.23
2.96
3.00
3.08
2.66
2.70
2.76
2.35
2.38
2.45
1.62
1.64
1.68
1.22
1.23
1.26
−
−
3.3
66
330
460
0.3
0.5
−
0.8
−
1.2
2.0
1.8
2.5
V
Symbol
Min
1.0
1.2
Typ
−
−
Max
5.5
5.5
mA
Unit
V
4.00
3.08
−
−
2.93
−
−
2.63
−
−
2.32
−
−
1.60
−
−
1.20
−
−
30
10
−
−
−
−
−
ppm/°C
msec
msec
V
OL
V
I
LEAK
−
−
1
mA
3. Production testing done at T
A
= 25°C, over temperature limits guaranteed by design.
4. Contact your ON Semiconductor sales representative for other threshold voltage options.
5. Contact your ON Semiconductor sales representative for timeout options availability for other threshold voltage options.
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3
MAX803 Series, NCP803 Series
TYPICAL OPERATING CHARACTERISTICS
0.7
0.6
SUPPLY CURRENT (mA)
0.5
25°C
0.4
0.3
−40°C
0.2
0.1
0
0.5
1.5
2.5
3.5
4.5
5.5
6.5
SUPPLY VOLTAGE (V)
V
TH
= 1.2 V
SUPPLY CURRENT (mA)
85°C
0.4
85°C
25°C
0.2
0.1
0
0.5
1.5
2.5
3.5
4.5
5.5
6.5
SUPPLY VOLTAGE (V)
−40°C
0.5
V
TH
= 4.63 V
0.3
Figure 3. Supply Current vs. Supply Voltage
0.4
V
TH
= 2.93 V
SUPPLY CURRENT (mA)
0.3
25°C
0.2
−40°C
85°C
Figure 4. Supply Current vs. Supply Voltage
NORMALIZED THRESHOLD VOLTAGE
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
0.994
−50
−25
0
25
50
75
100
125
V
TH
= 1.2 V
V
TH
= 4.63 V
0.1
0
0.5
1.5
2.5
3.5
4.5
5.5
6.5
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Figure 5. Supply Current vs. Supply Voltage
Figure 6. Normalized Reset Threshold Voltage
vs. Temperature
100
OUTPUT VOLTAGE V
CC
(mV)
80
60
85°C
40
20
−40°C
0
0.5 1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
25°C
V
TH
= 4.63 V
I
SINK
= 500
mA
RESET ASSERTED
0.5
SUPPLY CURRENT (mA)
0.4
V
CC
= 5.0 V
0.3
0.2
0.1
0
−50
V
CC
= 3.3 V
V
CC
= 1.0 V
−25
0
25
50
75
100
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
Figure 7. Supply Current vs. Temperature
Figure 8. Output Voltage Low vs. Supply
Voltage
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4
Embedded System
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