Document
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 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 msec of VCC falling through the reset voltage threshold. Reset is maintained active for a timeout period which is trimmed by the factory after VCC 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 VCC line. Low supply current of 0.5 mA (VCC = 3.2 V) make these devices suitable for battery powered applications.
Features
• Precision VCC 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 VCC = 1.0 V • Low Supply Current • VCC Transient Immunity • No External Components • Wide Operating Temperature: −40°C to 105°C • These Devices are Pb−Free and are RoHS Compliant
Typical Applications
• Computers • Embedded Systems • Battery Powered Equipment • Critical Microprocessor Power Supply Monitoring
VCC
C = 100 nF
VCC MAX803 NCP803
RESET
Rpull−up
VCC mP
RESET
GND
GND
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MARKING DIAGRAM
1
3 SOT−23 (TO−236) CASE 318
3
xxx MG G
2 12
SC−70 (SOT−323) CASE 419
xx MG G
1
xxx = Specific Device Code M = Date Code G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONFIGURATION
GND 1
3 VCC
RESET 2
SOT−23/SC−70 (Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking section on page 8 of this data sheet.
0 Figure 1. Typical Application Diagram
0
© Semiconductor Components Industries, LLC, 2006
October, 2015 − Rev. 10
1
Publication Order Number: MAX803/D
MAX803 Series, NCP803 Series
3
VCC
Timeout Counter
Oscillator
2 RESET
Vref
1 GND
Figure 2. NCP803, MAX803 Series Open−Drain Active−Low Output
PIN DESCRIPTION
Pin No.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3
Symbol GND
RESET
VCC
Description
Ground
RESET output remains low while VCC is below the reset voltage threshold, and for a reset timeout period after VCC rises above reset threshold. Supply Voltage: C = 100 nF is recommended as a bypass capacitor between VCC and GND.
ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage (VCC to GND) RESET Output Voltage (CMOS) Input Current, VCC Output Current, RESET
VCC −0.3 to 6.0
V
−0.3 to (VCC + 0.3)
V
20 mA
20 mA
dV/dt (VCC) Thermal Resistance, Junction−to−Air (Note 1)
SOT−23 SC−70
RqJA
100 V/msec
301 °C/W 314
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 Seconds)
ESD Protection Human Body Model (HBM): Following Specification JESD22−A114 Machine Model (MM): Following Specification JESD22−A115
TJ Tstg Tsol
−40 to +125 −65 to +150
+260
2000 200
°C °C °C V
Latchup Current Maximum Rating: Following Specification JESD78 Class II Positive Negative
ILatchup
200 200
mA
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected. 1. This based on a 35x35x1.6mm FR4 PCB with 10mm2 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.
PD
+
TJ(max) * RqJA
TA
with TJ(max) = 150°C
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MAX803 Series, NCP803 Series
ELECTRICAL CHARACTERISTICS TA = −40°C to +105°C unless otherwise noted. Typical values are at TA = +25°C. (Note 3)
Characteristic
Symbol
Min
Typ
Max Unit
VCC Range TA = 0°C to +70°C TA = −40°C to +105°C (Note 4)
V 1.0 − 5.5 1.2 − 5.5
Supply Current
VCC = 3.3 V TA = −40°C to +85°C TA = 85°C to +105°C (Note 5)
VCC = 5.5 V TA = −40°C to +85°C TA = 85°C to +105°C (Note 5)
Reset Threshold (Vin Decreasing) (Note 6) MAX803SQ463/NCP803SN463
TA = +25°C TA = −40°C to +85°C TA = +85°C to +105°C (Note 5)
ICC
− −
− − VTH
4.56 4.51 4.40
0.5 −
0.8 −
4.63 − −
mA
1.2 2.0
1.8 2.5
V
4.70 4.75 4.88
MAX803SQ438/N.