ON NCP803 Very low supply current 3-pin microprocessor reset monitor Datasheet

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 VCC falling
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 VCC = 1.0 V and is available
in a SOT-23 package.
The NCP803 is optimized to reject fast transient glitches on the VCC
line. Low supply current of 1.0 µA (VCC = 3.2 V) make this device
suitable for battery powered applications.
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MARKING
DIAGRAM
3
3
SOT-23
(TO-236)
CASE 318
1
xxxM
1
2
2
xxx = Specific Device Code
M = Monthly Date Code
Features
• Precision VCC Monitor for 2.5 V, 3.0 V, 3.3 V, and 5.0 V Supplies
• 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 VCC = 1.0 V
Low 1.0 µA Supply Current
VCC Transient Immunity
Small SOT-23 Package
No External Components
Wide Operating Temperature: -40°C to 105°C
GND
1
3
RESET
2
SOT-23*
NOTE: *SOT-23 is equivalent to JEDEC (TO-236)
Computers
Embedded Systems
Battery Powered Equipment
Critical µP Power Supply Monitoring
ORDERING INFORMATION
Device
NCP803SNxxxT1
VCC
Package
Shipping
SOT-23
3000/Tape & Reel
NOTE: The “xxx” denotes a suffix for Vcc voltage threshold
options - see page 6 for more details.
VCC
VCC
VCC
(Top View)
Typical Applications
•
•
•
•
PIN CONFIGURATION
Rpull- up
µP
NCP803
C = 100 nF
RESET
DEVICE MARKING INFORMATION
RESET
GND
See general marking information in the device marking
section on page 6 of this data sheet.
GND
0
0
Figure 1. Typical Application Diagram
 Semiconductor Components Industries, LLC, 2003
May, 2003 - Rev. 4
1
Publication Order Number:
NCP803/D
NCP803
PIN DESCRIPTION
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ÁÁÁÁÁÁÁ
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ÁÁÁÁÁÁÁ
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Pin No.
Symbol
1
GND
2
RESET
3
VCC
Description
Ground
RESET output remains low while VCC is below the reset voltage threshold, and for 240 msec (typ.)
after VCC rises above reset threshold.
Supply Voltage: C = 100 nF is recommended as a bypass capacitor between VCC and GND.
ABSOLUTE MAXIMUM RATINGS* (Note 1)
Rating
Symbol
Value
Unit
VCC
6.0
V
-0.3 to (VCC + 0.3)
V
Input Current, VCC
20
mA
Output Current, RESET
20
mA
Supply Voltage (VCC to GND)
RESET
dV/dt (VCC)
100
V/µsec
RJA
491
°C/W
Operating Temperature Range
TA
-40 to +105
°C
Storage Temperature Range
Tstg
-65 to +150
°C
Lead Temperature (Soldering, 10 Seconds)
Tsol
+260
°C
Thermal Resistance, Junction to Air
Latch-up performance:
ILatch- up
Negative
mA
150
*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.
TJ(max) TA
with TJ(max) = 150°C
PD RJA
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2
NCP803
ELECTRICAL CHARACTERISTICS TA = -40°C to +105°C unless otherwise noted. Typical values are at TA = +25°C. (Note 3)
Symbol
Characteristic
VCC Range
TA = 0°C to +70°C
TA = -40°C to +105°C
Min
Typ
Max
1.0
1.2
-
5.5
5.5
Unit
V
Supply Current
VCC = 3.3 V
TA = -40°C to +85°C
TA = 85°C to +105°C
VCC = 5.5 V
TA = -40°C to +85°C
TA = 85°C to +105°C
ICC
Reset Threshold (Note 4)
VTH
µA
-
0.5
-
1.2
2.0
-
0.8
-
1.8
2.5
V
NCP803SN463
TA = +25°C
TA = -40°C to +85°C
TA = +85°C to +105°C
4.56
4.51
4.39
4.63
-
4.70
4.75
4.87
NCP803SN438
TA = +25°C
TA = -40°C to +85°C
TA = +85°C to +105°C
4.31
4.27
4.16
4.38
-
4.45
4.49
4.60
NCP803SN308
TA = +25°C
TA = -40°C to +85°C
TA = +85°C to +105°C
3.04
3.00
2.92
3.08
-
3.11
3.15
3.23
NCP803SN293
TA = +25°C
TA = -40°C to +85°C
TA = +85°C to +105°C
2.89
2.85
2.78
2.93
-
2.96
3.00
3.08
NCP803SN263
TA = +25°C
TA = -40°C to +85°C
TA = +85°C to +105°C
2.59
2.55
2.50
2.63
-
2.66
2.70
2.76
NCP803SN232
TA = +25°C
TA = -40°C to +85°C
TA = +85°C to +105°C
2.29
2.26
2.20
2.32
-
2.35
2.38
2.44
NCP803SN160
TA = +25°C
TA = -40°C to +85°C
TA = +85°C to +105°C
1.58
1.56
1.52
1.60
-
1.62
1.64
1.68
Reset Temperature Coefficient
-
30
-
VCC to Reset Delay VCC = VTH to (VTH - 100 mV)
-
10
-
µsec
140
240
460
msec
VOL
-
-
0.3
V
ILEAK
-
-
1
µA
Reset Active Timeout Period
RESET Output Voltage Low
VCC = VTH - 0.2 V
1.6 V VTH 2.0 V, ISINK = 0.5 mA
2.1 V VTH 4.0 V, ISINK = 1.2 mA
4.1 V VTH 4.9 V, ISINK = 3.2 mA
RESET Leakage Current
VCC VTH, RESET De-asserted
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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3
ppm/°C
NCP803
APPLICATIONS INFORMATION
VCC Transient Rejection
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 pin.
The NCP803 provides accurate VCC monitoring and reset
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 VCC
pin.
VCC
Rpull- up
VCC
VCC
µP
NCP803
C = 100 nF
RESET
VCC
RESET
GND
VTH
GND
0
0
Overdrive
Figure 3. Interfacing to Bidirectional Reset I/O
NCP803 RESET Output Allows Use With Two Power
Supplies
MAXIMUM TRANSIENT DURATION (µs) I
Duration
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 VCC level that depends on the Rpull- up
value and the voltage to which it is connected.
300
250
200
VTH = 4.9 V
150
100
VTH = 3.08 V
VTH = 1.6 V
50
0
10
+3.3 V
20
30
40
50
60
70
80
+5.0 V
90 100
RESET COMPARATOR OVERDRIVE (mV)
Rpull- up
VCC
Figure 2. Maximum Transient Duration vs. Overdrive
for Glitch Rejection at 25°C
NCP803
VCC
µP
C = 100 nF
RESET
GND
RESET
GND
0
0
Figure 4. RESET Output with Two Power Supplies
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NCP803
TYPICAL CHARACTERISTICS
1.8
1.4
VTH = 1.60 V
1.2
105°C
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
1.6
1.4
1.2
85°C
1.0
25°C
0.8
0.6
0°C
0.4
-40 °C
85°C
1.0
0.8
25°C
0.6
0°C
-40 °C
0.4
0.2
0.2
0
0.5
1.5
2.5
3.5
4.5
0
0.5
5.5
1.5
2.5
SUPPLY VOLTAGE (V)
105°C
VTH = 4.90 V
1.2
0.999
85°C
1.0
VTH = 1.60 V
1.000
NORMALIZED VTH VOLTAGE
SUPPLY CURRENT (A)
5.5
1.001
VTH = 3.08 V
0.998
VTH = 4.90 V
0.997
0.8
0°C
0.6
25°C
0.996
0.995
0.4
-40 °C
0.2
0
0.5
1.5
2.5
3.5
4.5
0.994
0.993
-40
5.5
-20
0
20
40
60
80
100
120
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Figure 7. Supply Current vs. Supply Voltage
Figure 8. Normalized Reset Threshold Voltage
vs. Temperature
POWER-DOWN RESET TIMEOUT (S)
280
POWER-UP RESET TIMEOUT (mS)
4.5
Figure 6. Supply Current vs. Supply Voltage
1.6
270
260
250
VTH = 4.90 V
240
230
VTH = 3.08 V
220
VTH = 1.60 V
210
200
-40
3.5
SUPPLY VOLTAGE (V)
Figure 5. Supply Current vs. Supply Voltage
1.4
105°C
VTH = 3.08 V
-20
0
20
40
60
80
100
120
350
300
VTH = 4.90 V
250
200
150
100
VTH = 3.08 V
50
0
-40
VTH = 1.60 V
-20
0
20
40
60
80
TEMPERATURE (°C)
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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5
100
NCP803
TAPING FORM
Component Taping Orientation for 3L SOT-23 (JEDEC-236) Devices
USER DIRECTION OF FEED
DEVICE
MARKING
PIN 1
Standard Reel Component Orientation
(Mark Right Side Up)
Tape & Reel Specifications Table
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOT-23
8 mm
4 mm
3000
7 inches
MARKING AND THRESHOLD INFORMATION
Semicond ctor Part #
ON Semiconductor
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
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.
A
L
3
1
V
B S
2
G
C
D
H
J
K
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7
DIM
A
B
C
D
G
H
J
K
L
S
V
INCHES
MIN
MAX
0.1102 0.1197
0.0472 0.0551
0.0350 0.0440
0.0150 0.0200
0.0701 0.0807
0.0005 0.0040
0.0034 0.0070
0.0140 0.0285
0.0350 0.0401
0.0830 0.1039
0.0177 0.0236
MILLIMETERS
MIN
MAX
2.80
3.04
1.20
1.40
0.89
1.11
0.37
0.50
1.78
2.04
0.013
0.100
0.085
0.177
0.35
0.69
0.89
1.02
2.10
2.64
0.45
0.60
NCP803
SENSEFET is a trademark of Semiconductor Components Industries, LLC.
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changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
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8
NCP803/D
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