Microprocessor Supervisory Circuit
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
CHIP-ENABLE ON-RESISTANCE
vs. TEMPERATURE
V
CC
= +4.75V
VBATT = 2.8V
CE IN = V
CC
/2
MAX791-03
MAX791
V
CC
SUPPLY CURRENT vs. TEMPERATURE
(NORMAL OPERATING MODE)
MAX791-01
BATTERY SUPPLY CURRENT vs. TEMPERATURE
(BATTERY-BACKUP MODE)
BATTERY SUPPLY CURRENT (µA)
V
CC
= 0V
VBATT = 2.8V
NO LOAD
MAX791-02
58
V
CC
SUPPLY CURRENT (µA)
V
CC
= +5V
VBATT = 2.8V
PFI, CE IN = 0V
2
120
CE ON-RESISTANCE (Ω)
54
1.5
100
50
1
80
46
42
0.5
60
38
-60
-30
0
30
60
90
120
150
TEMPERATURE (°C)
0
-60
-30
0
30
60
90
120
150
TEMPERATURE (°C)
40
-60
-30
0
30
60
90
120 150 180
TEMPERATURE (°C)
VBATT-to-V
OUT
ON-RESISTANCE
vs. TEMPERATURE
MAX791-04
V
CC
-to-V
OUT
ON-RESISTANCE
vs. TEMPERATURE
V
CC
-to-V
OUT
ON-RESISTANCE (Ω)
MAX791-05
PFI THRESHOLD
vs. TEMPERATURE
MAX791-05
20
VBATT-to-V
OUT
ON-RESISTANCE (Ω)
VBATT = 2.0V
15
VBATT = 2.8V
1.2
1.1
1.50
1.25
PFI THRESHOLD (V)
1.00
0.75
0.50
0.25
0
V
CC
= +5V,
VBATT = 0V,
NO LOAD ON PFO
-60
-30
0
30
60
90
120
1.0
0.9
0.8
0.7
0.6
10
VBATT = 4.5V
5
-60
-30
0
30
60
TEMPERATURE (°C)
V
CC
= 0V
90
120
150
-60
-30
0
30
60
V
CC
= +5V,
VBATT = 0V
90
120
150
150
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET THRESHOLD
vs. TEMPERATURE
MAX791-07
RESET OUTPUT RESISTANCE
vs. TEMPERATURE
MAX791-08
RESET DELAY
vs. TEMPERATURE
V
CC
= 0V TO 5V STEP
VBATT = 2.8V
MAX791-09
4.80
4.75
RESET THRESHOLD (V)
4.70
4.65
4.60
4.55
4.50
4.45
4.40
4.35
4.30
-60
-30
0
30
60
90
120
VBATT = 0V,
POWER DOWN
600
RESET OUTPUT RESISTANCE (Ω)
500
400
300
200
100
0
V
CC
= 0V, VBATT = 2.8V
SINKING CURRENT
V
CC
= +5V, VBATT = 2.8V
SOURCING CURRENT
230
220
RESET DELAY (ms)
210
200
190
180
170
150
-60
-30
0
30
60
90
120
150
-60
-30
0
30
60
90
120
150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
