Datasheet

MAX791
Microprocessor Supervisory Circuit
58
38
-60 -30 30 150
V
CC
SUPPLY CURRENT vs. TEMPERATURE
(NORMAL OPERATING MODE)
42
54
MAX791-01
TEMPERATURE (°C)
V
CC
SUPPLY CURRENT (µA)
0 1209060
46
50
V
CC
= +5V
VBATT = 2.8V
PFI, CE IN = 0V
4.80
4.30
4.40
4.35
-60 -30 30 150
RESET THRESHOLD
vs. TEMPERATURE
MAX791-07
TEMPERATURE (°C)
RESET THRESHOLD (V)
0 1209060
4.45
4.50
4.55
4.60
4.65
4.70
4.75
VBATT = 0V,
POWER DOWN
600
0
100
-60 -30 30 150
RESET OUTPUT RESISTANCE
vs. TEMPERATURE
MAX791-08
TEMPERATURE (°C)
RESET OUTPUT RESISTANCE (Ω)
0 1209060
200
300
400
500
V
CC
= 0V, VBATT = 2.8V
SINKING CURRENT
V
CC
= +5V, VBATT = 2.8V
SOURCING CURRENT
230
170
180
-60 -30 30 150
RESET DELAY
vs. TEMPERATURE
MAX791-09
TEMPERATURE (°C)
RESET DELAY (ms)
01209060
190
200
210
220
V
CC
= 0V TO 5V STEP
VBATT = 2.8V
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
20
5
-60 -30 30 150
VBATT-to-V
OUT
ON-RESISTANCE
vs. TEMPERATURE
MAX791-04
TEMPERATURE (°C)
VBATT-to-V
OUT
ON-RESISTANCE (Ω)
0 1209060
10
15
VBATT = 2.0V
VBATT = 2.8V
VBATT = 4.5V
V
CC
= 0V
2.0
0
-60 -30 30 150
BATTERY-SUPPLY CURRENT vs. TEMPERATURE
(BATTERY-BACKUP MODE)
0.5
MAX791-02
TEMPERATURE (°C)
BATTERY SUPPLY CURRENT (µA)
0 1209060
1.0
1.5
V
CC
= 0V
VBATT = 2.8V
NO LOAD
120
40
-60 -30 30 150 180
CHIP-ENABLE ON-RESISTANCE
vs. TEMPERATURE
60
MAX791-03
TEMPERATURE (°C)
CE ON-RESISTANCE (Ω)
0 1209060
80
100
V
CC
= +4.75V
VBATT = 2.8V
CE IN = V
CC
/2
1.2
0.6
0.7
-60 -30 30 150
V
CC
-to-V
OUT
ON-RESISTANCE
vs. TEMPERATURE
MAX791-05
TEMPERATURE (°C)
V
CC
-to-V
OUT
ON-RESISTANCE (
Ω
)
0 1209060
0.8
0.9
1.0
1.1
V
CC
= +5V,
VBATT = 0V
1.50
0
0.25
-60 -30 30 150
PFI THRESHOLD
vs. TEMPERATURE
MAX791-05
TEMPERATURE (°C)
PFI THRESHOLD (V)
01209060
0.50
0.75
1.00
1.25
V
CC
= +5V,
VBATT = 0V,
NO LOAD ON PFO
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