MAX705CSLASHD datasheet(5/12 Pages) MAXIM

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NAME

FUNCTION

MAX705/MAX706

MAX707/MAX708

MAX813L

DIP/SO

μMAX

DIP/SO

μMAX

DIP/SO

μMAX

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.

VCC

+5V Supply Input

GND

0V Ground Reference for all signals

PFI

Power-Fail Voltage-Monitor Input. When PFI is less

than 1.25V, PFO goes low. Connect PFI to GND or

VCC when not used.

PFO

Power-Fail Output goes low and sinks current when

PFI is less than 1.25V; otherwise PFO stays high.

—

WDI

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 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.

No Connect

—

RESET

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.

MAX705–MAX708/MAX813L

Low-Cost, μP Supervisory Circuits

www.maximintegrated.com

Maxim Integrated │ 5

Pin Description

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