Datasheet

MAX821/MAX822
4-Pin µP Voltage Monitors with Pin-Selectable
Power-On Reset Timeout Delay
_______________________________________________________________________________________ 3
Note 1: RESET output for MAX821; RESET output for MAX822.
Note 2: During reset active timeout period only.
Note 3: Guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= full range, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
0.3
0.4
pF20
SRT Input Capacitance
(Note 3) (see Setting
the Reset Timeout Delay
section)
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX821R/S/T/U only, I
SINK
= 1.2mA,
V
CC
= V
TH(MIN)
MAX821L/M/P only, I
SINK
= 3.2mA,
V
CC
= V
TH(MIN)
Internal
CONDITIONS
0.3
V
OL
0.3
I
SINK
= 50µA
0.3
0.4
MAX822R/S/T only, I
SINK
= 1.2mA,
V
CC
= V
TH(MAX)
MAX822L/M only, I
SINK
= 3.2mA,
V
CC
= VTH(MAX)
V
0.8V
CC
V
OH
RESET Output Voltage
(MAX821)
V
CC
-1.5
MAX821R/S/T/U only, I
SOURCE
= 500µA,
V
CC
≥ V
TH(MAX)
MAX821L/M/P only, I
SOURCE
= 800µA,
V
CC
≥ V
TH(MAX)
0.6
-40
RESET TIMEOUT PERIOD
vs. TEMPERATURE
0.7
MAX 821/822 TOC-04
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)
40 60 80
0.9
0.8
-20 20 100
1.0
0
SRT = GND
30
-40
RESET TIMEOUT PERIOD
vs. TEMPERATURE
32
31
MAX 821/822 TOC-05
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)
40 60 80
35
34
33
-20 20 100
36
0
SRT = V
CC
150
-40
RESET TIMEOUT PERIOD
vs. TEMPERATURE
160
155
MAX 821/822 TOC-06
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)
40 60 80
175
170
165
-20 20 100
180
0
SRT = UNCONNECTED
V
OL
V
V
OH
RESET Output Voltage
(MAX822)
0.8V
CC
I
SOURCE
= 150µA, 1.4V ≤ V
CC
≤ V
TH(MIN)
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
T
A
= 0°C to +70°C,
V
CC
≥ 1V
T
A
= -40°C to +85°C,
V
CC
≥ 1.2V