Datasheet

MAX823/MAX824/MAX825
5-Pin Microprocessor Supervisory Circuits With
Watchdog Timer and Manual Reset
_______________________________________________________________________________________ 3
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
MAX82_L/M 10
Reset Threshold Hysteresis
MAX82_T/S/R/Z/Y 5
mV
Reset Threshold Temperature
Coefficient
40
ppm/°C
Reset Timeout Period t
RP
140 200 280
ms
V
CC
to RESET Delay V
RST
- V
CC
= 100mV 20 µs
MAX82_L/M, V
CC
= V
RST
max,
I
SOURCE
= 120µA
V
CC -
1.5
V
OH
MAX82_T/S/R/Z/Y, V
CC
= V
RST
max,
I
SOURCE
= 30µA
0.8 ✕ V
CC
MAX82_L/M, V
CC
= V
RST
min,
I
SINK
= 3.2mA
0.4
MAX82_T/S/R/Z/Y V
CC
= V
RST
min,
I
SINK
= 1.2mA
0.3
T
A
= 0°C to +70°C, V
CC
= 1V,
V
CC
falling, I
SINK
= 50µA
0.3
RESET Output Voltage
V
OL
T
A
= T
MIN
to T
MAX
, V
CC
= 1.2V,
V
CC
falling, V
BATT
= 0V, I
SINK
= 100µA
V
MAX82_L/M, RESET = 0V, V
CC
= 5.5V
800
RESET Output Short-Circuit
Current (Note 2)
I
SOURCE
MAX82_T/S/R/Z/Y, RESET = 0V, V
CC
= 3.6V
400
µA
V
OH
V
CC
> 1.8V, I
SOURCE
= 150µA
0.8 ✕ V
CC
MAX824L/M, MAX825L/M,
V
CC
= V
RST
max, I
SINK
= 3.2mA
0.4
RESET Output Voltage
V
OL
MAX824T/S/R/Z/Y, MAX825T/S/R/Z/Y,
V
CC
= V
RST
max, I
SINK
= 1.2mA
0.3
V
WATCHDOG INPUT (MAX823/MAX824)
Watchdog Timeout Period t
WD
1.12 1.60 2.40
s
WDI Pulse Width t
WDI
V
IL
= 0.4V, V
IH
= 0.8
✕
V
CC
50 ns
V
IL
0.3
✕
V
CC
WDI Input Voltage (Note 3)
V
IH
0.7
✕
V
CC
V
WDI = V
CC
, time average
120 160
WDI Input Current (Note 4)
WDI = 0, time average -20
-15
µA
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.75V to +5.5V for MAX82_L, V
CC
= +4.5V to +5.5V for MAX82_M, V
CC
= +3.15V to +3.6V for MAX82_T, V
CC
= +3V
to +3.6V for MAX82_S, V
CC
= +2.7V to +3.6V for MAX82_R, V
CC
= +2.38V to +2.75V for MAX82_Z, V
CC
= +2.25V to +2.75V for
MAX82_Y, T
A
= T
MIN
to T
MAX
, T
A
= -40°C to +85°C (SC70), T
A
= -40°C to +125°C (SOT23), unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 1)