Datasheet

(MAX691A, MAX800L: V
CC
= +4.75V to +5.5V; MAX693A, MAX800M: V
CC
= +4.5V to +5.5V; V
VBATT
= 2.8V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Battery Switchover
Hysteresis
60 mV
BATT ON Output Low
Voltage
I
SINK
= 3.2mA 0.1 0.4
V
I
SINK
= 25mA 0.7 1.5
BATT ON Output
Short-Circuit Current
Sink current 60 100 mA
Source current 1 15 100 µA
RESET AND WATCHDOG TIMER
Reset Threshold Voltage
MAX691A, MAX800L 4.50 4.65 4.75
V
MAX693A, MAX800M 4.25 4.40 4.50
MAX800L, T
A
= +25°C, V
CC
falling 4.55 4.70
MAX800M, T
A
= +25°C, V
CC
falling 4.30 4.45
Reset Threshold Hysteresis 15 mV
V
CC
to RESET Delay Power-down 80 µs
LOW LINE-to-RESET Delay 800 ns
Reset Active Timeout Period,
Internal Oscillator
Power-up 140 200 280 ms
Reset Active Timeout Period,
External Clock (Note 4)
Power-up 2048
Clock
Cycles
Watchdog Timeout Period,
Internal Oscillator
Long period 1.0 1.6 2.25 sec
Short period 70 100 140 ms
Watchdog Timeout Period,
External Clock (Note 4)
Long period 4096
Clock
Cycles
Short period 1024
Minimum Watchdog Input
Pulse Width
V
IL
= 0.8V, V
IH
= 0.75 x V
CC
100 ns
RESET Output Voltage
I
SINK
= 50μA, V
CC
= 1V, VBATT = 0V, V
CC
falling 0.004 0.3
VI
SINK
= 3.2mA, V
CC
= 4.25V 0.1 0.4
I
SOURCE
= 1.6mA, V
CC
= 5V 3.5
RESET Output
Short-Circuit Current
Output source current 7 20 mA
RESET Output Voltage Low
(Note 5)
I
SINK
= 3.2mA 0.1 0.4 V
LOW LINE Output Voltage
I
SINK
= 3.2mA, V
CC
= 4.25V 0.4
V
I
SOURCE
= 1μA, V
CC
= 5V 3.5
LOW LINE Output
Short-Circuit Current
Output source current 1 15 100 µA
WDO Output Voltage
I
SINK
= 3.2mA 0.4
I
SOURCE
= 500μA, V
CC
= 5V 3.5
WDO Output
Short-Circuit Current
Output source current 3 10 mA
WDI Threshold Voltage
(Note 6)
V
IH
0.75 x V
CC
V
V
IL
0.8
WDI Input Current
WDI = 0V -50 -10
µA
WDI = V
OUT
20 50
MAX691A/MAX693A/
MAX800L/MAX800M
Microprocessor Supervisory Circuits
www.maximintegrated.com
Maxim Integrated │ 3
Electrical Characteristics (continued)