MAX815 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX815

±1% Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits

Maxim Integrated 

±1% Accuracy, Low-Power, +3V and +5V

µP Supervisory Circuits

______________________________________________________________Pin Description

MAX814

1

PIN

MAX815

1

MAX816

1

NAME

FUNCTION

Manual-Reset Input. Triggers a reset when pulled below 1.10V. This active-

MR

low input has an internal 150µA pullup current to VCC, and can be driven

with CMOS logic or shorted to GND with a switch or transistor.

2

2

—

Positive Power-Supply Input. When VCC is below the reset threshold

voltage*, RESET is low, and remains low for a minimum of 140ms after

VCC

it rises above the threshold.

—

—

2

Positive Power-Supply Input. On the MAX816, RESET is controlled by

RESET IN, not VCC.

3

3

3

GND Ground

Power-Fail Input. The PFI threshold voltage is 1.70V on the MAX816 and on

4

4

4

PFI MAX814/MAX815 parts with the T suffix. It is 2.50V on MAX814/MAX815

parts with K, L, and N suffixes. Connect PFI to GND or VCC when not used.

5

5

5

PFO

Power-Fail Output. When PFI is below its threshold, PFO is low;

otherwise it is high.

Watchdog CMOS Input. If WDI remains high or low for more than 1.56s, the

—

6

—

WDI watchdog timer times out, and WDO goes low. The timer is reset to

zero on each WDI transition.

Low-Line Output. Normally high, LOW LINE goes low when VCC falls 60mV

6

—

—

LOW LINE above the reset threshold. It returns high as soon as VCC rises above the

low-line threshold.

—

—

Reset Comparator Input. Reference is 1.70V. When RESET IN is below

6

RESET IN 1.70V, RESET is low, and remains low for a minimum of 140ms after it rises

above the reference.

7

7

7

RESET

Reset Output. Normally high, active low. Controlled by MR and reset

comparator.

Watchdog Output. Normally high, WDO goes low whenever the VCC reset

—

8

—

WDO

threshold comparator input voltage is low or when the watchdog timer

times out. There is no appreciable delay going either direction when the

VCC threshold comparator toggles.

8

—

8

RESET Reset Output. Active high. The inverse of RESET.

*Reset Threshold Voltage is determined by part number suffix: K = 4.80V, L = 4.70V, N = 4.55V, T = 3.03V.

_______________Detailed Description

The MAX814/MAX815/MAX816 are high-accuracy, low-

power microprocessor (µP) supervisory circuits. They

have µP-reset, watchdog-timer, and power-fail func-

tions. Typical applications illustrating their similarities

and differences are shown in Figures 1, 2, and 3.

Figures 4, 5, and 6 show the block diagrams of these

parts.

_______________________________________________________________________________________ 7

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