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MAX802SCPA Datasheet

  • MAX802SCPA

  • Maxim Integrated Products [3.0V/3.3V Microprocessor Supervi...

  • 102.06KB

  • MAXIM   MAXIM

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3.0V/3.3V Microprocessor Supervisory Circuits
MAX690T/S/R, 704T/S/R, 802T/S/R, 804鈥?06T/S/R
3.0V OR 3.3V
+5V
V
CC
1N4148
VBATT
0.47F
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
GND
V
OUT
TO STATIC
RAM
3.0V OR
3.3V
1N4148
V
CC
RESET
(RESET)
TO
碌P
0.47F
VBATT
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
GND
V
OUT
TO STATIC
RAM
RESET
(RESET)
TO
碌P
a
( ) ARE FOR MAX804T/S/R, MAX805T/S/R ONLY
b
( ) ARE FOR MAX804T/S/R, MAX805T/S/R ONLY
Figure 3. Using a SuperCap as a Backup Power Source
Connecting an ordinary signal diode in series with R3,
as shown in Figure 4b, causes the lower trip point (V
L
)
to coincide with the trip point without hysteresis (V
TRIP
),
so the entire hysteresis window occurs above V
TRIP
.
This method provides additional noise margin without
compromising the accuracy of the power-fail threshold
when the monitored voltage is falling. It is useful for
accurately detecting when a voltage falls past a
threshold.
The current through R1 and R2 should be at least 1碌A(chǔ) to
ensure that the 25nA (max over extended temperature
range) PFI input current does not shift the trip point. R3
should be larger than 10k鈩?so it does not load down the
鈥?鈥斺€?/div>
鈥?/div>
P F O pin. Capacitor C1 adds additional noise rejection.
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
example, the R E S E T output is driven high and the 碌P
wants to pull it low, indeterminate logic levels may
result. To correct this, connect a 4.7k鈩?resistor
鈥?鈥?鈥?/div>
鈥?鈥斺€?/div>
between the R E S E T output and the 碌P reset I/O, as in
鈥撯€?鈥?鈥?/div>
鈥?鈥?/div>
Figure 6. Buffer the R E S E T output to other system
components.
While issuing resets to the 碌P during power-up, power-
down, and brownout conditions, these supervisors are
relatively immune to short-duration negative-going V
CC
transients (glitches). It is usually undesirable to reset
the 碌P when V
CC
experiences only small glitches.
Figure 7 shows maximum transient duration vs. reset-
comparator overdrive, for which reset pulses are
not
generated. The graph was produced using negative-
going V
CC
pulses, starting at 3.3V and ending below
the reset threshold by the magnitude indicated (reset
comparator overdrive). The graph shows the maximum
pulse width a negative-going V
CC
transient may
typically have without causing a reset pulse to be
issued. As the amplitude of the transient increases
(i.e., goes farther below the reset threshold), the
maximum allowable pulse width decreases. Typically,
a V
CC
transient that goes 100mV below the reset
threshold and lasts for 40碌s or less will not cause a
reset pulse to be issued.
A 100nF bypass capacitor mounted close to the V
CC
pin provides additional transient immunity.
Negative-Going V
CC
Transients
Monitoring an Additional Power Supply
These 碌P supervisors can monitor either positive or
negative supplies using a resistor voltage divider to
鈥?鈥斺€?/div>
鈥?/div>
PFI. P F O can be used to generate 鈥?interrupt to the
an
鈥?鈥斺€?鈥?鈥?/div>
鈥?/div>
碌P (Figure 5). Connecting P F O to M R on the MAX704
and MAX806 causes reset to assert when the
monitored supply goes out of tolerance. Reset remains
鈥撯€?/div>
鈥?/div>
鈥?鈥斺€?/div>
鈥?/div>
asserted as long as P F O holds MR low, and for 200ms
鈥?鈥斺€?/div>
鈥?/div>
after P F O goes high.
Interfacing to 碌Ps
with Bidirectional Reset Pins
碌Ps with bidirectional reset pins, such as the Motorola
68HC11 series, can contend with the MAX690_/
鈥撯€?鈥?鈥?/div>
鈥?鈥?/div>
MAX704_/MAX802_/MAX806_ R E S E T output. If, for
_______________________________________________________________________________________
9

MAX802SCPA PDF文件相關(guān)型號(hào)

MAX802SCSA,MAX804SMJA

MAX802SCPA 產(chǎn)品屬性

  • Maxim Integrated Products

  • 1

  • 1 V to 5.5 V

  • 2.88 V

  • 3.02 V

  • Active Low, Push-Pull

  • Not Resettable

  • Watchdog

  • Backup

  • 200 ms

  • 5.5 V

  • 1 V

  • 50 uA

  • 727 mW

  • + 70 C

  • Through Hole

  • PDIP N

  • 0 C

  • Yes

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