MAX792TEPE Maxim Integrated, MAX792TEPE Datasheet - Page 10
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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
Microprocessor and Nonvolatile
Memory Supervisory Circuits
Figure 2. Manual-Reset Timing Diagram
Figure 3. Diode "OR" connections allow multiple reset sources
to connect to
In internal threshold mode, the low-line comparator
monitors V
above the reset threshold, and with 15mV of hysteresis.
For normal operation (V
LOWLINE is pulled to V
to the µP, as described in the previous section, when
V
The MAX792/MAX820 provide both RESET and RESET
outputs. The RESET and RESET outputs ensure that the
µP powers up in a known state, and prevent code-exe-
cution errors during power-up, power-down, or
brownout conditions.
The reset function will be asserted during the following
conditions:
10
CC
1) V
2) MR less than 1.30V typ.
3) Reset remains asserted for 200ms typ after V
begins to fall (Figure 4).
______________________________________________________________________________________
rises above the reset threshold or after MR has
exceeded 1.30V typ.
*
SOURCES
CC
DIODES NOT REQUIRED ON OPEN-DRAIN OUTPUTS
OTHER
RESET
CE IN OV
less than the programmed reset threshold.
CE OUT
CC
RESET
MR .
MR
with a threshold voltage typically 120mV
MANUAL RESET
CC
*
*
. Use LOWLINE to provide an NMI
CC
above the reset threshold),
.
.
.
9
MR
25µs MIN
12µs TYP
15µs TYP
Reset Function
Low-Line Output
MAX792
MAX820
CC
When reset is asserted, all the internal counters are
reset, the watchdog output (WDO) and watchdog-pulse
output (WDPO) are set high, and the set watchdog-time-
out input (SWT) is set to (V
connected to V
enable transmission gate is also disabled while reset is
asserted; the chip-enable input (CE IN) becomes high
impedance and the chip-enable output (CE OUT) is
pulled up to V
Figure 4a. Connection for Internal Threshold Mode
Figure 4b. Connection for External Threshold Programming Mode
R3 = 1.30V x V
R2 = 1.30V x V
R1 = V
V
V
LOW LINE
RESET
CC MAX
I
R3
R1
MAX
R2
x I
CC MAX
CC MAX
MAX
x I
– (R2 + R3)
4
5
MAX
CC
RESET IN/INT
LLIN/REFOUT
.
CC
–
RESET IN/INT
LLIN/REFOUT
R3
(for internal timeouts). The chip-
MAX792
MAX792
GND
V
I
V
MAX
CC
GND
V
IN
V
12
3
CC
IN
3
12
CC
= THE MAXIMUM DESIRED CURRENT
THROUGH THE VOLTAGE DIVIDED.
LOW LINE
LOW LINE
- 0.6V) if it is not already
RESET
RESET
RESET
RESET
2
1
10
1
2
10
TO µP
TO µP
TO µP NMI
TO µP
TO µP NMI
TO µP