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MAX6323CUT46

μP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset

Maxim Integrated 

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MAX6323/MAX6324

μP Supervisory Circuits with Windowed

(Min/Max) Watchdog and Manual Reset

General Description

The MAX6323/MAX6324 microprocessor (µP) supervi-

sory circuits monitor power supplies and µP activity in

digital systems. A watchdog timer looks for activity out-

side an expected window of operation. Six laser-trimmed

reset thresholds are available with ±2.5% accuracy from

+2.32V to +4.63V. Valid RESET output is guaranteed

down to VCC = +1.2V.

The RESET output is either push-pull (MAX6323) or

open-drain (MAX6324). RESET is asserted low when

VCC falls below the reset threshold, or when the manual

reset input (MR) is asserted low. RESET remains assert-

ed for at least 100ms after VCC rises above the reset

threshold and MR is deasserted.

The watchdog pulse output (WDPO) utilizes an open-

drain configuration. It can be triggered either by a fast

timeout fault (watchdog input pulses are too close to each

other) or a slow timeout fault (no watchdog input pulse is

observed within the timeout period). The watchdog time-

out is measured from the last falling edge of watchdog

input (WDI) with a minimum pulse width of 300ns. WDPO

is asserted for 1ms when a fault is observed. Eight laser-

trimmed timeout periods are available.

The MAX6323/MAX6324 are offered in a 6-pin SOT23

package and operate over the extended temperature

range (-40°C to +125°C).

Applications

●● Automotive

●● Industrial

●● Medical

●● Embedded Control Systems

Pin Configuration

TOP VIEW

MR 1

6 RESET

MAX6323

GND 2 MAX6324 5 WDPO

WDI 3

4 VCC

SOT23

Typical Operating Circuit appears at end of data sheet.

Features

●● Min/Max (Windowed) Watchdog,

8 Factory-Trimmed Timing Options

●● Pulsed Open-Drain, Active-Low Watchdog Output

●● Power-On Reset

●● Precision Monitoring of +2.5V, +3.0V, +3.3V,

and +5.0V Power Supplies

●● Open-Drain or Push-Pull RESET Outputs

●● Low-Power Operation (23µA typ)

●● Debounced Manual Reset Input

●● Guaranteed Reset Valid to VCC = +1.2V

●● AEC-Q100 Qualified MAX6324HUT44/V+T

Ordering Information

PART

TEMP

RANGE

PIN-

RESET

PACKAGE OUTPUT

MAX6323_UT_ _-T -40°C to +125°C 6 SOT23 Push-Pull

Ordering Information continued at end of data sheet.

*These devices are factory trimmed to one of eight watchdog-

timeout windows and one of six reset voltage thresholds. Insert

the letter corresponding to the desired watchdog-timeout window

(A, B, C, D, E, F, G, or H) into the blank following the number

6323 or 6324 (see Watchdog Timeout table). Insert the two-

digit code (46, 44, 31, 29, 26, or 23) after the letters UT for the

desired nominal reset threshold (see Reset Threshold Range

table at end of data sheet).

/V denotes an automotive qualified part.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

Note: There are eight standard versions of each device available

(see Standard Versions table). Sample stock is generally held on

standard versions only. Standard versions have an order

increment requirement of 2500 pieces. Nonstandard versions

have an order increment requirement of 10,000 pieces. Contact

factory for availability of nonstandard versions.

Watchdog Timeout

SUFFIX

A

B

WATCHDOG TIMEOUT*

FAST

SLOW

MAX

UNITS

MIN

UNITS

1.5

ms

10

15

ms

100

ms

C

15

ms

300

D

15

ms

10

s

E

15

ms

60

F

23

ms

47

ms

G

39

ms

82

H

719

ms

1.3

s

*See Figure 1 for operation.

19-1838; Rev 8; 12/18

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