Datasheet

MAX792/MAX820
_______________________________________________________________________________________ 3
Microprocessor and Nonvolatile
Memory Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.75V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER CONDITIONS
ms
MIN TYP MAX UNITS
µA
LOWLINE Short-Circuit Current
Output source current, V
CC
= 5.5V 10 50
SWT connected to V
CC,
V
CC = 5V
1.00 1.60 2.25
SWT connected to V
CC,
V
CC = 3V
1.00 1.60 2.25
4.7nF capacitor connected from SWT to GND
,
V
CC = 3V
70
Watchdog Timeout Period
4.7nF capacitor connected from SWT to GND
,
V
CC = 5V
MAX792/MAX820L/M
100
sec
50 120 210
Low-Line Threshold Voltage
(Internal Threshold Mode)—V
TH
MAX792/MAX820R/S/T
V
CC = 5V
40 100 210
mV
100
MAX792, V
CC
= 5V OR V
CC
= 3V
Watchdog Input Pulse Width V
IL
= 0V, V
IH
= V
CC
1.25 1.30 1.35
Low-Line Threshold Voltage
(External Programming Mode)
V
CC = 3V
MAX820, V
CC
= 5V OR V
CC
= 3V
300
ns
1.274 1.30 1.326
V
Low-Line Hysteresis
(Internal Threshold Mode)
I
SINK
= 50µA, V
CC
= 1V, V
CC
falling
20 mV
0.01 0.30
I
SINK
= 1.6mA 0.1 0.4
I
SOURCE
= 1mA V
CC
- 1
WDO Output Voltage
I
SOURCE
= 100µA V
CC
- 0.5
V
I
SOURCE
= 100µA
WDPO to WDO Delay
70 ns
WDPO Duration
0.5 1.7 6.0 ms
I
SINK
= 50µA, V
CC
= 1V, V
CC
falling 0.01 0.3
I
SINK
= 1.6mA 0.1 0.4
V
IH
I
SOURCE
= 1mA V
CC
- 1
WDPO Output Voltage
V
IL
V
CC
- 0.5
V
V
IH
0.75 x V
CC
V
IL
V
CC
= 4.25V
0.8
0.9 x V
CC
WDI Threshold Voltage
V
CC
= 2.55V
0.2
V
WDI Input Current ±1 µA
LLIN/REFOUT Leakage Current
External Programming Mode
±0.01 ±25 nA
Low-Line Comparator Delay V
CC
falling 450 µs
I
SINK
= 3.2mA 0.4
LOWLINE Voltage
I
SOURCE
= 1µA V
CC
- 1
V
LOW-LINE COMPARATOR
WATCHDOG FUNCTION