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SGM802
Low-Power, SC70/SOT µP Reset Circuit with
Capacitor-Adjustable Reset Timeout Delay
GENERAL DESCRIPTION
The SGM802 low-power micro-processor supervisor
circuit monitors system voltages from 1.6V to 5V. This
device performs a single function: it asserts a reset signal
whenever the VCC supply voltage falls below its reset
threshold. The reset output remains asserted for the
reset timeout period after VCC rises above the reset
threshold. The reset timeout is externally set by a
capacitor to provide more flexibility.
FEATURES
Monitor System Voltages from 1.6V to 5V
Capacitor-Adjustable Reset Timeout Period
Low Quiescent Current (3µA TYP)
Push-Pull RESET Output Option
Guaranteed RESET Valid to VCC = 1V
Immune to Short VCC Transients
Available in Green SC70-4 (R) and SOT-143
Packages
The SGM802 has an active-high, push-pull reset output.
It is available in Green SC70-4 (R) and SOT-143
packages. The SGM802 is specified over an ambient
temperature range of -40to +85.
TYPICAL APPLICATION
APPLICATIONS
Portable Equipment
Battery-Powered Computers/Controllers
Automotive
Medical Equipment
Intelligent Instruments
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Computers
VCC
CSRT
SRT
SGM802
RESET
GND
VCC
MICROPROCESSOR
SYSTEM
RESET
GND
SG Micro Corp
www.sg-micro.com
REV. A. 2

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SGM802
Low-Power, SC70/SOT µP Reset Circuit with
Capacitor-Adjustable Reset Timeout Delay
PACKAGE/ORDERING INFORMATION
MODEL
SGM802
PIN-PACKAGE
RESET
THRESHOLD (TYP)
1.63V
SOT-143
2.32V
2.63V
2.93V
1.63V
SC70-4 (R)
2.32V
2.63V
2.93V
ORDERING
NUMBER
SGM802-1.63YKA4G/TR
SGM802-2.32YKA4G/TR
SGM802-2.63YKA4G/TR
SGM802-2.93YKA4G/TR
SGM802-1.63YC4G/TR
SGM802-2.32YC4G/TR
SGM802-2.63YC4G/TR
SGM802-2.93YC4G/TR
PACKAGE
MARKING
S78XX
S79XX
S7AXX
S7BXX
S7DXX
S7EXX
S7FXX
S80XX
PACKING
OPTION
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
NOTE: XX = Date Code.
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean
Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact
your SGMICRO representative directly.
MARKING INFORMATION
SYY X X
Date code - Month ("A" = Jan. "B" = Feb. "L" = Dec.)
Date code - Year ("A" = 2010, "B" = 2011 )
Chip I.D.
For example: S78BA (2011, January)
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced to GND
VCC.............................................................................-0.3V to 6V
SRT, RESET (Push-Pull)............................-0.3V to (VCC + 0.3V)
Input Current (All Pins).......................................................20mA
Output Current (RESET) ...................................................20mA
Operating Temperature Range ...........................-40to +85
Storage Temperature Range ............................-65to +150
Junction Temperature........................................................150
Lead Temperature (Soldering, 10s) ..................................260
ESD Susceptibility
HBM................................................................................. 3000V
MM......................................................................................300V
NOTE:
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.
CAUTION
This integrated circuit can be damaged by ESD if you don’t pay
attention to ESD protection. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failure to observe proper handling and installation procedures
can cause damage. ESD damage can range from subtle
performance degradation to complete device failure. Precision
integrated circuits may be more susceptible to damage because
very small parametric changes could cause the device not to
meet its published specifications.
SGMICRO reserves the right to make any change in circuit
design, specification or other related things if necessary without
notice at any time. Please contact SGMICRO sales office to get
the latest datasheet.
SG Micro Corp
www.sg-micro.com
2

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SGM802
Low-Power, SC70/SOT µP Reset Circuit with
Capacitor-Adjustable Reset Timeout Delay
PIN CONFIGURATIONS (TOP VIEW)
SGM802
GND 1
4 RESET
VCC 1
SGM802
4 RESET
VCC 2
SOT-143
3 SRT
GND 2
SC70-4 (R)
3 SRT
PIN DESCRIPTION
PIN
SOT-143 SC70-4 (R)
NAME
FUNCTION
1 2 GND Ground.
2 1 VCC Supply Voltage and Reset Threshold Monitor Input.
Set Reset Timeout Input. Connect a capacitor between SRT and ground to
3
3
SRT
set the timeout period. Determine the period as follows:
tRP = 2.6 × 106 × CSRT + 340 × 10-6
with tRP in seconds and CSRT in farads.
RESET changes from low to high whenever VCC drops below the selected
4 4 RESET reset threshold voltage. RESET remains high for the reset timeout period
after VCC exceeds the reset threshold.
SG Micro Corp
www.sg-micro.com
3

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SGM802
Low-Power, SC70/SOT µP Reset Circuit with
Capacitor-Adjustable Reset Timeout Delay
ELECTRICAL CHARACTERISTICS
(VCC = 1V to 5.5V, TA = -40to +85, typical values are at VCC = 5V and TA = +25, unless otherwise specified.)
PARAMETER
Supply Voltage Range
Supply Current
VCC Reset Threshold Accuracy
Hysteresis
VCC to Reset Delay
Reset Timeout Period
VSRT Ramp Current
VSRT Ramp Threshold
RESET Output Voltage High
RESET Output Voltage Low
SYMBOL
VCC
ICC
VTH
VHYST
tRD
tRP
IRAMP
VTH-RAMP
VOH
VOL
CONDITIONS
VCC 5.0V
VCC 3.3V
VCC 2.0V
TA = +25
TA = -40to +85
VCC falling at 1mV/µs
CSRT = 1500pF
CSRT = 0
VSRT = 0 to 0.65V, VCC = 1.6V to 5V
VCC = 1.6V to 5V (VRAMP rising)
VCC 1.0V, ISOURCE = 1µA
VCC 1.8V, ISOURCE = 150µA
VCC 2.7V, ISOURCE = 500µA
VCC 4.5V, ISOURCE = 800µA
VCC 1.8V, ISINK = 500µA
VCC 2.7V, ISINK = 1.2mA
VCC 4.5V, ISINK = 3.2mA
MIN
1.0
VTH - 2.5%
VTH - 3.5%
3.00
0.8 × VCC
0.8 × VCC
0.8 × VCC
0.8 × VCC
TYP
3.9
3.4
3.0
4 × VTH
80
4.25
0.34
210
0.6
MAX
5.5
7.0
5.5
4.8
VTH + 2.5%
VTH + 3.5%
5.75
0.3
0.3
0.4
UNITS
V
μA
V
mV
µs
ms
nA
V
V
V
SG Micro Corp
www.sg-micro.com
4

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SGM802
Low-Power, SC70/SOT µP Reset Circuit with
Capacitor-Adjustable Reset Timeout Delay
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = 5V, CSRT = 1500pF, TA = +25, unless otherwise noted.
Supply Current vs. Supply Voltage
6
5
+85
4 +25
3
-40
2
1
VTH = 1.63V
0
0123456
Supply Voltage (V)
Reset Timeout Period vs. Temperature
500
CSRT = 0
460
420
380
340
300
-50
-25
0 25 50
Temperature ()
75 100
Normalized Reset Threshold vs. Temperature
1.006
1.004
1.002
1.000
0.998
0.996
0.994
-50
-25
0 25 50
Temperature ()
75 100
10000
1000
100
10
1
0.1
0.01
Reset Timeout Period vs. CSRT
0.1 1 10 100 1000
CSRT (nF)
Reset Timeout Period vs. Temperature
4.6
CSRT = 1500pF
4.5
4.4
4.3
4.2
4.1
-50
-25
0 25 50
Temperature ()
75 100
Maximum Transient Duration vs. Reset
Threshold Overdrive
70
VTH = 2.93V
60
50
40
30
20
10
0
200 400 600 800
Reset Threshold Overdrive (mV)
1000
SG Micro Corp
www.sg-micro.com
5