MAX792TEPE Maxim Integrated, MAX792TEPE Datasheet - Page 11
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MAX792TEPE
Manufacturer Part Number
MAX792TEPE
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX792, MAX792L, MAX792M, MAX792R, MAX792S, MAX792T, MAX820, MAX820L, MAX820M, MAX820R, MAX820S, MAX820Tr
Datasheet
1.MAX19586ETNTD.pdf
(16 pages)
Specifications of MAX792TEPE
Number Of Voltages Monitored
1
Monitored Voltage
2.75 V to 5.5 V
Undervoltage Threshold
3 V
Overvoltage Threshold
3.15 V
Output Type
Active High, Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
280 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Package / Case
PDIP N
Chip Enable Signals
Yes
Maximum Power Dissipation
842 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
Yes
Supply Current (typ)
150 uA
Supply Voltage - Min
2.75 V
The RESET output is active low and typically sinks 1.6mA
at 0.1V. When deasserted, RESET sources 1.6mA at typi-
cally V
RESET. RESET is guaranteed to be valid down to V
and an external 10kΩ pull-down resistor on RESET
ensures that it will be valid with V
(Figure 5). As V
RESET output switch reduces accordingly, increasing the
r
resistor ensures that the parallel combination of switch
plus resistor will be around 10kΩ and the saturation
voltage will be below 0.4V while sinking 40µA. When
using an external pull-down resistor of 10kΩ, the high
state for the RESET output with V
4.60V.
The overvoltage comparator is an uncommitted com-
parator that has no effect on the operation of other chip
functions. Use this input to provide overvoltage indica-
tion by connecting a voltage divider from the input sup-
ply, as in Figure 6.
Connect OVI to ground if the overvoltage function is not
used. OVO goes low when OVI goes above 1.30V. With
OVI below 1.30V, OVO is actively pulled to V
source1µA.
Figure 4c. Alternative Connection for External Programming Mode
DS(ON)
V
V
LOW LINE
RESET
R1
R2
CC
and the saturation voltage. The 10kΩ pull-down
REGULATOR
= 1.3 R3 + R4
- 1.5V. The RESET output is the inverse of
= 1.3
(
(
CC
R4
R1 + R2
R3
R4
R2
______________________________________________________________________________________
)
Reset Outputs (RESET and
goes below 1V, the gate drive to the
)
Overvoltage Comparator
LLIN/REFOUT
RESET IN/INT
MAX792
MAX820
GND
V
CC
CC
LOW LINE
= 4.75V is typically
CC
RESET
RESET
Microprocessor and Nonvolatile
down to GND
2
1
10
CC
Memory Supervisory Circuits
CC
and can
TO µP
TO µP
TO µP NMI
RESET )
= 1V,
The watchdog monitors µP activity via the watchdog
input (WDI). If the µP becomes inactive, WDO and WDPO
are asserted. To use the watchdog function, connect
WDI to a µP bus line or I/O line. If WDI remains high or
low for longer than the watchdog timeout period (1.6s
nominal), WDPO and WDO are asserted, indicating a soft-
ware fault condition (see Watchdog-Pulse Output and
Watchdog Output sections).
If the watchdog function is unused, connect WDI to V
or GND. A change of state (high-to-low, low-to-high, or
a minimum 100ns pulse) at WDI during the watchdog
period resets the watchdog timer. The watchdog timer
Figure 5. Adding an external pull-down resistor ensures RESET
is valid with V
Figure 6. Detecting an Overvoltage Condition
VOLTAGE REGULATOR
CC
MAX792
MAX820
down to GND.
7
OVI
RESET
MAX792
MAX820
1
1.30V
GND
V
CC
12
3
Watchdog Function
10k
OVO
6
Watchdog Input
TO µP RESET
OVERVOLTAGE
CC
11