Datasheet

MAX691A/MAX693A/MAX800L/MAX800M
Microprocessor Supervisory Circuits
_______________________________________________________________________________________ 3
MAX691A, MAX800L
mA720
–
RESET Output Short-Circuit
Current
V
3.5
RESET Output Voltage
0.1 0.4
0.004 0.3
ns100
Minimum Watchdog Input
Pulse Width
Clock
Cycles
1024
Watchdog Timeout Period,
External Clock (Note 4)
4096
ms70 100 140
Watchdog Timeout Period,
Internal Oscillator
1.0 1.6 2.25
Clock
Cycles
2048
Reset Active Timeout Period,
External Clock (Note 4)
ms140 200 280
Reset Active Timeout Period,
Internal Oscillator
ns800
LOW LINE-to-RESET Delay
µs80V
CC
to RESET Delay
MAX693A, MAX800M
CONDITIONS
mV15Reset Threshold Hysteresis
V
4.30 4.45
Reset Threshold Voltage
4.55 4.70
4.25 4.40 4.50
4.50 4.65 4.75
UNITSMIN TYP MAXPARAMETER
Output source current
I
SOURCE
= 1.6mA, V
CC
= 5V
I
SINK
= 3.2mA, V
CC
= 4.25V
I
SINK
= 50µA, V
CC
= 1V, VBATT = 0V, V
CC
falling
V
IL
= 0.8V, V
IH
= 0.75 x V
CC
Short period
Long period
Short period
Long period
MAX800M, T
A
= +25°C, V
CC
falling
Power-up
Power-up
MAX800L, T
A
= +25°C, V
CC
falling
Power-down
ELECTRICAL CHARACTERISTICS (continued)
(MAX691A, MAX800L: V
CC
= +4.75V to +5.5V; MAX693A, MAX800M: V
CC
= +4.5V to +5.5V; VBATT = 2.8V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
RESET Output Voltage Low
(Note 5)
I
SINK
= 3.2mA 0.1 0.4 V
I
SINK
= 3.2mA, V
CC
= 4.25V 0.4
LOW LINE Output Voltage
I
SOURCE
= 1µA, V
CC
= 5V 3.5
V
LOW LINE Output
Short-Circuit Current
Output source current 115100 µA
I
SINK
= 3.2mA 0.4
WDO Output Voltage
I
SOURCE
= 500µA, V
CC
= 5V 3.5
V
WDO Output
Short-Circuit Current
Output source current 310mA
V
IH
0.75 x V
CC
WDI Threshold Voltage
(Note 6)
V
IL
0.8
V
WDI = 0V -50 -10
WDI Input Current
WDI = V
OUT
20 50
µA
sec
mV60
Battery Switchover
Hysteresis
I
SINK
= 25mA
V
0.7 1.5
BATT ON Output
Low Voltage
I
SINK
= 3.2mA 0.1 0.4
Source current µA115100
BATT ON Output
Short-Circuit Current
Sink current mA60
RESET AND WATCHDOG TIMER