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MAX795S Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # MAX795S
Description  3.0V/3.3V Adjustable Microprocessor Supervisory Circuits
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX795S Datasheet(HTML) 10 Page - Maxim Integrated Products

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Reset Threshold
The MAX793T/MAX795T are intended for 3.3V systems
with a ±5% power-supply tolerance and a 10% systems
tolerance. Except when MR is asserted, reset will not
assert as long as the power supply remains above
3.15V (3.3V - 5%). Reset is guaranteed to assert
before the power supply falls below 3.0V (3.3V - 10%).
The MAX793S/MAX795S are designed for 3.3V ±10%
power supplies. Except when MR is asserted, they are
guaranteed not to assert reset as long as the supply
remains above 3.0V (3.0V is just above 3.3V - 10%).
Reset is guaranteed to assert before the power supply
falls below 2.85V (3.3V - 14%).
The MAX793R/MAX795R are optimized to monitor 3.0V
±10% power supplies. Reset will not occur until VCC
falls below 2.7V (3.0V - 10%), but is guaranteed to
occur before the supply falls below 2.55V (3.0V - 15%).
Program the MAX794’s reset threshold with an external
voltage divider to RESET IN. The reset-threshold toler-
ance will be a combination of the RESET IN tolerance
and the tolerance of the resistors used to make the
external voltage divider. Calculate the reset threshold
as follows:
VRST = VRST IN (R1 / R2 + 1)
Using the standard application circuit (Figure 3), the
reset threshold may be programmed anywhere in the
range of VSW (the battery switch threshold) to 5.5V.
Reset is asserted when VCC falls below VSW.
Battery Freshness Seal
The MAX793/MAX794’s battery freshness seal discon-
nects the backup battery from internal circuitry until it is
needed. This allows an OEM to ensure that the backup
battery connected to BATT will be fresh when the final
product is put to use. To enable the freshness seal,
connect a battery to BATT, ground PFO, bring VCC
above the reset threshold and hold it there until reset is
deasserted following the reset timeout period, then
bring VCC back down again (Figure 4). Once the bat-
tery freshness seal is enabled (disconnecting the back-
up battery from the internal circuitry and anything
connected to OUT), it remains enabled until VCC is
brought above VRST. Note that connecting PFO to MR
will not interfere with battery freshness seal operation.
BATT OK Output (MAX793)
BATT OK indicates the status of the backup battery.
When reset is not asserted, the MAX793 checks the
battery voltage continuously. If VBATT is below VBOK
(2.0V min), BATT OK goes low; otherwise, it remains
pulled up to VCC. BATT OK also goes low when VCC
goes below VSW.
Watchdog Input (MAX793/MAX794)
In the MAX793/MAX794, the watchdog circuit monitors
the µP’s activity. If the µP does not toggle the watch-
dog input (WDI) within 1.6sec, WDO goes low. The
internal 1.6sec timer is cleared and WDO returns high
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
10
______________________________________________________________________________________
MAX794
RESET
LOWLINE
WDI
CE IN
CE OUT
3.3V
+5V
BATT
RESET IN
A0-A15
MR
+5V SUPPLY
FAILURE
BATT ON
PFI
4.7k
WDO
OUT
CMOS
RAM
ADDRESS
DECODER
0.1
µF
PMOS
0.1
µF
VCC
PFO
VRST = VRST IN
(R1 + 1)
GND
I/O
NMI
RESET
VCC
VCC
0.1
µF
3.6V
R1
D
S
R2
(OPTIONAL)
Si9433DY
SILICONIX
R2
Figure 3. MAX794 Standard Application Circuit
VCC
VRST
VRST
RESET
PFO
(EXTERNALLY HELD AT 0V)
RESET PULLED UP TO VCC
PFO STATE LATCHED,
FRESHNESS SEAL ENABLED.
tRP
Figure 4. Battery Freshness Seal Enable Timing


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