Datasheet

(T
A
= +25°C, unless otherwise noted.)
2.74
2.78
2.76
2.82
2.80
2.84
2.86
2.90
2.88
2.92
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
VOLTAGE OUTPUT HIGH
vs. SOURCE CURRENT
MAX6821 toc08
I
SOURCE
(mA)
V
OUT
(V)
V
CC
= +2.9V
0
0.10
0.05
0.20
0.15
0.30
0.25
0.35
0 2 31 4 5 6 7
VOLTAGE OUTPUT LOW
vs. SINK CURRENT
MAX6821 toc07
I
SINK
(mA)
V
OUT
(V)
V
CC
= +2.9V
0
60
40
20
80
100
120
0 806020 40 100 120 140 160 180 200
MAXIMUM V
CC
TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6821 toc06
RESET THRESHOLD OVERDRIVE (mV), V
TH
- V
CC
TRANSIENT DURATION (µs)
RESET OCCURS
ABOVE CURVE
0.94
0.96
1.00
0.98
1.04
1.02
1.06
-40 0 20-20 40 60 80 100 120
NORMALIZED RESET THRESHOLD
DELAY vs. TEMPERATURE
MAX6821 toc05
TEMPERATURE (°C)
RESET THRESHOLD (V)
1.0
1.2
1.1
1.4
1.3
1.6
1.5
1.7
1.9
1.8
2.0
-40 0 20 40-20 60 80 100 120
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
MAX6821 toc04
TEMPERATURE (°C)
WATCHDOG TIMEOUT PERIOD (s)
0
10
5
20
15
30
25
35
-40 0 20-20 40 60 80 100 120
V
CC
TO RESET OUTPUT DELAY
vs. TEMPERATURE
MAX6821 toc03
TEMPERATURE (°C)
PROPAGATION DELAY (µs)
V
CC
FALLING, V
CC
= V
TH
- 100mV
TEMPERATURE (°C)
150
170
160
190
180
210
200
220
240
230
250
-40 0 20 40-20 60 80 100 120
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6821 toc02
RESET TIMEOUT PERIOD (ms)
3
5
4
7
6
9
8
10
12
11
13
-40 0 20 40-20 60 80 100 120
SUPPLY CURRENT
vs. TEMPERATURE
MAX6821 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
V
CC
= +5V, L VERSION
V
CC
= +3.3V, S VERSION
V
CC
= +1.8V, V VERSION
Maxim Integrated │ 4
www.maximintegrated.com
MAX6821/MAX6825 Low-Voltage SOT23 µP Supervisors
with Manual Reset and Watchdog Timer
Typical Operating Characteristics