MAX706R MAXIM [Maxim Integrated Products], MAX706R Datasheet - Page 6

• Manufacturer Part Number: MAX706R
• Description: +3V Voltage Monitoring, Low-Cost uP Supervisory Circuits
• Manufacturer: MAXIM [Maxim Integrated Products]

+3V Voltage Monitoring, Low-Cost µP
Supervisory Circuits
6
SO/DIP
_______________________________________________________________________________________
MAX706AP
—
—
MAX706P
1
2
3
4
5
6
7
8
µMAX
—
—
3
4
5
6
7
8
1
2
MAX706AR/AS/AT
SO/DIP
MAX706R/S/T,
—
—
1
2
3
4
5
6
8
7
PIN
µMAX
—
—
3
4
5
6
7
8
2
1
SO/DIP µMAX
MAX708R/S/T
—
—
1
2
3
4
5
8
7
6
—
—
3
4
5
6
7
2
1
8
RESET
RESET
NAME
WDO
GND
N.C.
V
PFO
WDI
MR
PFI
C C
Acti ve-Low , M anual -Reset Inp ut. P ull M R b el ow 0.6V to tr i gg er a
r eset pul se. M R i s TTL/C M OS com p ati b l e w hen V
b e shorted to GN D wi th a swi tch. M R i s i nter nal l y connected to a
70µA sour ce curr ent. C onnect to V
S upp l y V ol tag e Inp ut
Ground
Adjustable Power-Fail Comparator Input. Connect PFI to a
resistive divider to set the desired PFI threshold. When PFI is
less than 1.25V, PFO goes low and sinks current; otherwise,
PFO remains high. Connect PFI to GND if not used.
Active-Low, Power-Fail Comparator Output. PFO asserts when
PFI is below the internal 1.25V threshold. PFO deasserts when
PFI is above the internal 1.25V threshold. Leave PFO
unconnected if not used.
Watchdog Input. A falling or rising transition must occur at
WDI within 1.6s to prevent WDO from asserting (see Figure 4).
The internal watchdog timer is reset to zero when reset is
asserted or when transition occurs at WDI. The watchdog
function for the MAX706P/R/S/T can not be disabled. The
watchdog timer for the MAX706AP/AR/AS/AT disables when
WDI input is left open or connected to a tri-state output in its
high-impedance state with a leakage current of less than
600nA.
Active-High Reset Output. Reset remains high when V
below the reset threshold or MR is held low. It remains low for
200ms after the reset conditions end (Figure 3).
Active-Low Watchdog Output. WDO goes low when a
transition does not occur at WDI within 1.6s and remains low
until a transition occurs at WDI (indicating the watchdog
interrupt has been serviced). WDO also goes low when V
falls below the reset threshold; however, unlike the reset
output signal, WDO goes high as soon as V
the reset threshold.
Active-Low Reset Output. RESET remains low when V
below the reset threshold or MR is held low. It remains low for
200ms after the reset conditions end (Figure 3).
No Connection. Not internally connected.
FUNCTION
C C
or l eave unconnected .
Pin Description
CC
C C
rises above
= 5V and can
CC
CC
CC
is
is