MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
______________________________________________________________Pin Description
PIN
MAX705/MAX706
DIP/SO
µMAX
MAX707/MAX708
DIP/SO
µMAX
MAX813L
DIP/SO
µMAX
Manual-Reset Input triggers a reset pulse when
pulled below 0.8V. This active-low input has an inter-
nal 250µA pull-up current. It can be driven from a TTL
or CMOS logic line as well as shorted to ground with
a switch.
+5V Supply Input
0V Ground Reference for all signals
Power-Fail Voltage Monitor Input. When PFI is less
than 1.25V,
PFO
goes low. Connect PFI to GND or
V
CC
when not used.
Power-Fail Output goes low and sinks current when
PFI is less than 1.25V; otherwise
PFO
stays high.
Watchdog Input. If WDI remains high or low for
1.6sec, the internal watchdog timer runs out and
WDO goes low (Figure 1). Floating WDI or connect-
ing WDI to a high-impedance three-state buffer dis-
ables the watchdog feature. The internal watchdog
timer clears whenever reset is asserted, WDI is three-
stated, or WDI sees a rising or falling edge.
No Connect
Active-Low Reset Output pulses low for 200ms when
triggered, and stays low whenever V
CC
is below the
reset threshold (4.65V in the MAX705 and 4.40V in the
MAX706). It remains low for 200ms after V
CC
rises
above the reset threshold or
MR
goes from low to high
(Figure 3). A watchdog timeout will not trigger
RESET
unless
WDO
is connected to
MR.
Watchdog Output pulls low when the internal watch-
dog timer finishes its 1.6sec count and does not go
high again until the watchdog is cleared.
WDO
also
goes low during low-line conditions. Whenever V
CC
is
below the reset threshold,
WDO
stays low; however,
unlike
RESET, WDO
does not have a minimum pulse
width. As soon as V
CC
rises above the reset thresh-
old,
WDO
goes high with no delay.
Active-High Reset Output is the inverse of
RESET.
Whenever RESET is high,
RESET
is low, and vice
versa (Figure 2). The MAX813L has a RESET output
only.
NAME
FUNCTION
1
3
1
3
1
3
MR
2
3
4
5
2
3
4
5
2
3
4
5
V
CC
GND
4
6
4
6
4
6
PFI
5
7
5
7
5
7
PFO
6
8
—
—
6
8
WDI
—
—
6
—
—
—
N.C.
7
1
7
1
—
—
RESET
8
2
—
—
8
2
WDO
—
—
8
2
7
1
RESET
Maxim Integrated
5
ROCHESTER [ Rochester Electronics ]
