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NCP803
Very Low Supply Current
3−Pin Microprocessor
Reset Monitor
The NCP803 is a cost-effective system supervisor circuit designed
to monitor VCC 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 µsec of V
through the reset voltage threshold. Reset is maintained active for a
minimum of 140 msec after VCC rises above the reset threshold. The
NCP803 has an open drain active-low RESET output. The output of
the NCP803 is guaranteed valid down to V
= 1.0 V and is available
CC
in a SOT-23 package.
The NCP803 is optimized to reject fast transient glitches on the V
line. Low supply current of 1.0 µA (V
= 3.2 V) make this device
CC
suitable for battery powered applications.
Features
• Precision V
Monitor for 2.5 V, 3.0 V, 3.3 V, and 5.0 V Supplies
CC
• Precision Monitoring Voltages from 1.6 V to 4.9 V Available
in 100 mV Steps
• 140 msec Guaranteed Minimum RESET Output Duration
• RESET Output Guaranteed to V
= 1.0 V
CC
• Low 1.0 µA Supply Current
• V
Transient Immunity
CC
• Small SOT-23 Package
• No External Components
• Wide Operating Temperature: -40°C to 105°C
T ypical Applications
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
falling
CC
CC
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MARKING
DIAGRAM
3
SOT-23
(TO-236)
1
2
GND
RESET
NOTE: *SOT-23 is equivalent to JEDEC (TO-236)
ORDERING INFORMATION
Device Package Shipping
CASE 318
xxx = Specific Device Code
M = Monthly Date Code
PIN CONFIGURATION
1
2
SOT-23*
(Top View)
3
xxxM
1
3
2
V
CC
V
CC
V
CC
C = 100 nF
Figure 1. Typical Application Diagram
Semiconductor Components Industries, LLC, 2003
May, 2003 - Rev. 4
NCP803
RESET RESET
GND GND
R
pull- up
NCP803SNxxxT1 SOT-23 3000/Tape & Reel
NOTE: The “xxx” denotes a suffix for Vcc voltage threshold
V
CC
µP
00
1 Publication Order Number:
options - see page 6 for more details.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 6 of this data sheet.
NCP803/D
NCP803
Á
Á
Á
PIN DESCRIPTION
Pin No. Symbol Description
1
2
ÁÁ
БББББ
3
ABSOLUTE MAXIMUM RATINGS* (Note 1)
Supply Voltage (VCC to GND) V
RESET -0.3 to (VCC + 0.3) V
Input Current, V
Output Current, RESET 20 mA
dV/dt (VCC) 100 V/µsec
Thermal Resistance, Junction to Air R
Operating Temperature Range T
Storage Temperature Range T
Lead Temperature (Soldering, 10 Seconds) T
Latch-up performance:
*Maximum Ratings are those values beyond which damage to the device may occur.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model 4000 V per MIL-STD-883, Method 3015.
Machine Model Method 400 V.
2. The maximum package power dissipation limit must not be exceeded.
P
D
CC
T
J(max)
GND
RESET
V
CC
T
R
Ground
RESET output remains low while VCC is below the reset voltage threshold, and for 240 msec (typ.)
after V
ББББББББББББББББББББББ
rises above reset threshold.
CC
Supply Voltage: C = 100 nF is recommended as a bypass capacitor between VCC and GND.
Rating
Symbol Value Unit
CC
6.0 V
20 mA
JA
A
stg
sol
I
Latch- up
Negative
A
with T
J(max)
= 150°C
491 °C/W
-40 to +105 °C
-65 to +150 °C
+260 °C
150
mA
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NCP803
ELECTRICAL CHARACTERISTICS T
Characteristic
VCC Range
T
= 0°C to +70°C
A
= -40°C to +105°C
T
A
Supply Current
= 3.3 V
V
CC
= -40°C to +85°C
T
A
T
= 85°C to +105°C
A
= 5.5 V
V
CC
T
= -40°C to +85°C
A
= 85°C to +105°C
T
A
Reset Threshold (Note 4)
NCP803SN463
= +25°C
T
A
T
= -40°C to +85°C
A
= +85°C to +105°C
T
A
NCP803SN438
= +25°C
T
A
T
= -40°C to +85°C
A
= +85°C to +105°C
T
A
NCP803SN308
= +25°C
T
A
T
= -40°C to +85°C
A
= +85°C to +105°C
T
A
= -40°C to +105°C unless otherwise noted. Typical values are at TA = +25°C. (Note 3)
A
Symbol Min Typ Max Unit
1.0
1.2
I
CC
-
-
-
-
V
TH
4.56
4.51
4.39
4.31
4.27
4.16
3.04
3.00
2.92
-
-
0.5
-
0.8
-
4.63
-
-
4.38
-
-
3.08
-
-
5.5
5.5
1.2
2.0
1.8
2.5
4.70
4.75
4.87
4.45
4.49
4.60
3.11
3.15
3.23
V
µA
V
NCP803SN293
= +25°C
T
A
T
= -40°C to +85°C
A
= +85°C to +105°C
T
A
2.89
2.85
2.78
2.93
-
-
2.96
3.00
3.08
NCP803SN263
= +25°C
T
A
T
= -40°C to +85°C
A
= +85°C to +105°C
T
A
2.59
2.55
2.50
2.63
-
-
2.66
2.70
2.76
NCP803SN232
= +25°C
T
A
T
= -40°C to +85°C
A
= +85°C to +105°C
T
A
2.29
2.26
2.20
2.32
-
-
2.35
2.38
2.44
NCP803SN160
= +25°C
T
A
T
= -40°C to +85°C
A
= +85°C to +105°C
T
A
1.58
1.56
1.52
1.60
-
-
1.62
1.64
1.68
Reset Temperature Coefficient - 30 - ppm/°C
VCC to Reset Delay VCC = VTH to (VTH - 100 mV) - 10 - µsec
Reset Active Timeout Period 140 240 460 msec
RESET Output Voltage Low
V
= VTH - 0.2 V
CC
1.6 V V
2.1 V V
4.1 V V
2.0 V, I
TH
4.0 V, I
TH
4.9 V, I
TH
RESET Leakage Current
VTH, RESET De-asserted
V
CC
SINK
SINK
SINK
= 0.5 mA
= 1.2 mA
= 3.2 mA
V
I
LEAK
OL
- - 0.3 V
- - 1 µA
3. Production testing done at TA = 25°C, over temperature limits guaranteed by design.
4. Contact your ON Semiconductor sales representative for other threshold voltage options.
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NCP803
0
APPLICATIONS INFORMATION
VCC Transient Rejection
The NCP803 provides accurate V
monitoring and reset
CC
timing during power-up, power-down, and brownout/sag
conditions, and rejects negative-going transients (glitches)
on the power supply line. Figure 2 shows the maximum
transient duration vs. maximum negative excursion
(overdrive) for glitch rejection. Any combination of
duration and overdrive which lies under the curve will not
generate a reset signal. Combinations above the curve are
detected as a brownout or power-down. Typically, transient
that goes 100 mV below the reset threshold and lasts 5 µs or
less will not cause a reset pulse. Transient immunity can be
improved by adding a capacitor in close proximity to the V
CC
pin.
V
CC
V
TH
Overdrive
Duration
300
250
200
150
100
50
VTH = 4.9 V
VTH = 3.08 V
VTH = 1.6 V
Processors With Bidirectional I/O Pins
Some µP’s (such as Motorola 68HC11) have
bi-directional reset pins which interface easily with the
Open Drain RESET output of the NCP803. As shown in
Figure 3, one can connect directly to the RESET output of
the NCP803 to the RESET pin of the µP. The pull-up resistor
avoids an undetermined voltage of the RESET
V
CC
V
CC
NCP803
C = 100 nF
RESET RESET
GND GND
Figure 3. Interfacing to Bidirectional Reset I/O
NCP803 RESET Output Allows Use With Two Power
Supplies
R
pull- up
pin.
V
µP
CC
00
In numerous applications the pull-up resistor placed on
the RESET
output is connected to the supply voltage
monitored by the IC. Nevertheless, a different supply
voltage can also power this output and so level-shift from
the monitored supply to reset the µP. However, if the
NCP803’s supply goes below 1 V, the RESET output ability
to sink current will decrease and the result is a high state on
the pin even though the supply’s IC is under the threshold
level. This occurs at a V
level that depends on the R
CC
pull-up
value and the voltage to which it is connected.
+3.3 V +5.0 V
0
MAXIMUM TRANSIENT DURATION (µs) I
10
20 50 70 80 90 10
RESET COMPARATOR OVERDRIVE (mV)
4030
60
Figure 2. Maximum Transient Duration vs. Overdrive
for Glitch Rejection at 25°C
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R
pull- up
C = 100 nF
V
CC
NCP803
RESET RESET
GND GND
Figure 4. RESET Output with Two Power Supplies
4
V
CC
µP
00
NCP803
TYPICAL CHARACTERISTICS
1.8
VTH = 1.60 V
1.6
1.4
1.2
1.0
0.8
0.6
0.4
SUPPLY CURRENT (A)
0.2
0
0.5 1.5 2.5 3.5 4.5 5.5
SUPPLY VOLTAGE (V)
105°C
85°C
25°C
0°C
-40 °C
Figure 5. Supply Current vs. Supply Voltage
1.6
1.4
VTH = 4.90 V
1.2
1.0
0.8
0.6
0.4
SUPPLY CURRENT (A)
0.2
0
0.5 1.5 2.5 3.5 4.5 5.5
SUPPLY VOLTAGE (V)
0°C
105°C
85°C
25°C
-40 °C
Figure 7. Supply Current vs. Supply Voltage Figure 8. Normalized Reset Threshold Voltage
1.4
VTH = 3.08 V
1.2
1.0
0.8
0.6
0.4
SUPPLY CURRENT (A)
0.2
0
0.5 1.5 2.5 3.5 4.5 5.5
SUPPLY VOLTAGE (V)
105°C
85°C
25°C
-40 °C
Figure 6. Supply Current vs. Supply Voltage
1.001
1.000
VTH = 3.08 V
0.999
0.998
VOLTAGE
TH
0.997
0.996
0.995
0.994
NORMALIZED V
0.993
-40 -20 0 20 40 60 80
VTH = 4.90 V
TEMPERATURE (°C)
VTH = 1.60 V
vs. Temperature
0°C
100 120
280
270
260
250
240
230
220
210
POWER-UP RESET TIMEOUT (mS)
200
-40 -20 0 20 40 60 80
VTH = 4.90 V
VTH = 3.08 V
VTH = 1.60 V
TEMPERATURE (°C)
100 120
350
300
250
200
150
100
50
POWER-DOWN RESET TIMEOUT (S)
-40 -20 0 20 40 60 80
0
VTH = 4.90 V
VTH = 3.08 V
VTH = 1.60 V
TEMPERATURE (°C)
Figure 9. Power-up Reset Timeout vs. Temperature Figure 10. Power-down Reset Timeout vs.
Temperature (Overdrive = 20 mV)
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100
TAPING FORM
NCP803
Component Taping Orientation for 3L SOT-23 (JEDEC-236) Devices
USER DIRECTION OF FEED
DEVICE
MARKING
PIN 1
Tape & Reel Specifications Table
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
SOT-23
Standard Reel Component Orientation
(Mark Right Side Up)
8 mm 4 mm 3000 7 inches
MARKING AND THRESHOLD INFORMATION
ON Semiconductor Part # VTH* Marking (Note 5)
NCP803SN160T1 1.60 SCQM
NCP803SN232T1 2.32 SQRM
NCP803SN263T1 2.63 SQCM
NCP803SN293T1 2.93 SQDM
NCP803SN308T1 3.08 SQEM
NCP803SN438T1 4.38 SQFM
NCP803SN463T1 4.63 SQGM
*Contact your ON Semiconductor sales representative for other threshold voltage options.
5. M = Monthly Date Code
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NCP803
PACKAGE DIMENSIONS
SOT-23
PLASTIC PACKAGE (TO-236)
CASE 318-08
ISSUE AH
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
A
L
3
1
2
S
B
GV
C
D
H
K
J
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. MAXIMUM LEAD THICKNESS INCLUDES LEAD
FINISH THICKNESS. MINIMUM LEAD THICKNESS
IS THE MINIMUM THICKNESS OF BASE
MATERIAL.
4. 318−03 AND −07 OBSOLETE, NEW STANDARD
318−08.
INCHES
DIMAMIN MAX MIN MAX
0.1102 0.1197 2.80 3.04
B 0.0472 0.0551 1.20 1.40
C 0.0350 0.0440 0.89 1.11
D 0.0150 0.0200 0.37 0.50
G 0.0701 0.0807 1.78 2.04
H 0.0005 0.0040 0.013 0.100
J 0.0034 0.0070 0.085 0.177
K 0.0140 0.0285 0.35 0.69
L 0.0350 0.0401 0.89 1.02
S 0.0830 0.1039 2.10 2.64
V 0.0177 0.0236 0.45 0.60
MILLIMETERS
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NCP803
SENSEFET is a trademark of Semiconductor Components Industries, LLC.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make
changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all
liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death
may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada
Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada
Email: ONlit@hibbertco.com
N. American Technical Support: 800-282-9855 Toll Free USA/Canada
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JAPAN: ON Semiconductor, Japan Customer Focus Center
2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051
Phone: 81-3-5773-3850
ON Semiconductor Website: http://onsemi.com
For additional information, please contact your local
Sales Representative.
NCP803/D
8
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