Open-Drain SOT µP Reset Circuit
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
6
5
4
VCC = 5V
3
VCC = 3V
2
1
VCC = 1V
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
6
5
4
TA = +85°C
3
TA = +25°C
2
1
TA = -40°C
POWER-DOWN RESET DELAY
vs. TEMPERATURE
50
VCC FALLING AT 1mV/µs
40
30
VTH = 4.63V
20
VTH = 3.00V
10
0
-50 -30 -10 10 30 50 70 90
TEMPERATURE (°C)
0
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
0
-50 -30 -10 10 30 50 70 90
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE (VCC RISING)
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
-50 -30 -10 10 30 50 70 90
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE (VCC FALLING)
1.006
1.004
1.002
1.000
0.998
0.996
0.994
-50 -30 -10 10 30 50 70 90
TEMPERATURE (°C)
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
100
TA = +25°C
RESET OCCURS
80
ABOVE CURVE
VTH = 4.63V
60
40
20
VT = 3.00V
0
10
100
1000
RESET COMP. OVERDRIVE, VTH - VCC (mV)
______________________________________________________________Pin Description
PIN NAME
FUNCTION
1
GND Ground
2
RESET
Active-Low Open-Drain Output. Connect to an external pull-up resistor. Can be pulled up to a voltage
higher than VCC, but less than 6V.
3
MR
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and
for the reset timeout period (tRP) after the reset conditions are terminated. Connect to VCC if not used.
4
VCC
Supply Voltage and Reset Threshold Monitor Input
_______________________________________________________________________________________ 3