MAX813 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX813 Datasheet PDF : 12 Pages
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MAX705–MAX708/MAX813L
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Pin Description
MAX705/MAX706
DIP/SO μMAX
PIN
MAX707/MAX708
DIP/SO μMAX
MAX813L
DIP/SO μMAX
1
3
1
3
1
3
2
4
2
4
2
4
3
5
3
5
3
5
4
6
4
6
4
6
5
7
5
7
5
7
6
8
—
—
6
8
—
—
6
—
—
—
7
1
7
1
—
—
8
2
—
—
8
2
—
—
8
2
7
1
NAME
FUNCTION
MR
VCC
GND
PFI
PFO
Manual-Reset Input triggers a reset pulse when
pulled below 0.8V. This active-low input has an
internal 250μA pullup 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
VCC 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 connecting
WDI WDI to a high-impedance three-state buffer disables
the watchdog feature. The internal watchdog timer
clears whenever reset is asserted, WDI is three
stated, or WDI sees a rising or falling edge.
N.C.
RESET
No Connect
Active-Low Reset Output pulses low for 200ms when
triggered, and stays low whenever VCC is below the
reset threshold (4.65V in the MAX705 and 4.40V in
the MAX706). It remains low for 200ms after VCC
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.
WDO
Watchdog Output pulls low when the internal
watchdog 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
VCC is below the reset threshold, WDO stays low;
however, unlike RESET, WDO does not have a
minimum pulse width. As soon as VCC rises above
the reset threshold, WDO goes high with no delay.
RESET
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.
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