Microprocessor Supervisory Circuits
MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
__________________________________________Typical Operating Characteristics
OUTPUT VOLTAGE
vs. LOAD CURRENT
5.00
4.95
V
CC
= +5V
V
BATT
= +2.8V
T
A
= +25°C
V
OUT
(V)
2.80
2.78
OUTPUT VOLTAGE
vs. LOAD CURRENT
V
CC
= 0V
V
BATT
= +2.8V
T
A
= +25°C
MAX690A
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
+5V
V
BATT
= OV
T
A
= +25°C
V
CC
1V/div
V
OUT
(V)
4.90
2.76
0V
2.74
SLOPE = 80Ω
2.72
0V
0
0.2
0.4
0.6
0.8
1.0
500ms/div
I
OUT
(mA)
RESET
V
CC
V
CC
RESET
GND
2k
1V/div
RESET
330pF
+5V
4.85
SLOPE = 5Ω
4.80
4.75
0
10
20
30
40
50
I
OUT
(mA)
2.70
MAX690A
RESET RESPONSE TIME
+5V
V
CC
T
A
= +25°C
+5V
V
CC
RESET
V
CC
RESET
GND
1V/div
+5V
+4V
PFO
PFI
POWER-FAIL COMPARATOR
RESPONSE TIME
PFI
+5V
PFO
30pF
+1.25V
+1.30V
PFI
0V
V
CC
= +5V
T
A
= +25°C
+1.2V
400ns/div
+0V
0V
1k
PFO
POWER-FAIL COMPARATOR
RESPONSE TIME
+5V
PFO
30pF
+1.25V
1k
V
CC
= +5V
T
A
= +25°C
+3V
10k
RESET
30pF
+1.3V
PFI
+1.20V
400ns/div
2µs/div
MAX805L
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
+5V
V
CC
1V/div
+5V
V
CC
MAX805L
RESET RESPONSE TIME
+4V
V
CC
RESET
GND
0V
RESET
V
CC
V
BATT
RESET
GND
+5V
10k
330
pF
0V
10k
330pF
+4V
1V/div
0V
500ms/div
2µs/div
0V
4
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
