MAX6323 Maxim, MAX6323 Datasheet
MAX6323
Manufacturer Part Number
MAX6323
Description
P Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset
Manufacturer
Maxim
Datasheet
1.MAX6323.pdf
(12 pages)
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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 V
The RESET output is either push-pull (MAX6323) or
open-drain (MAX6324). RESET is asserted low when
V
reset input (MR) is asserted low. RESET remains assert-
ed for at least 100ms after V
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 timeout 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).
19-1838; Rev 2; 2/03
Typical Operating Circuit appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
CC
TOP VIEW
falls below the reset threshold, or when the manual
Automotive
Industrial
Medical
Embedded Control Systems
GND
WDI
MR
________________________________________________________________ Maxim Integrated Products
1
2
3
µP Supervisory Circuits with Windowed
CC
(Min/Max) Watchdog and Manual Reset
General Description
MAX6323
MAX6324
SOT23
= +1.2V.
Pin Configuration
CC
rises above the reset
6
5
4
Applications
RESET
WDPO
V
CC
o Min/Max (Windowed) Watchdog,
o Pulsed Open-Drain, Active-Low Watchdog Output
o Power-On Reset
o Precision Monitoring of +2.5V, +3.0V, +3.3V,
o Open-Drain or Push-Pull RESET Outputs
o Low-Power Operation (23µA typ)
o Debounced Manual Reset Input
o Guaranteed Reset Valid to V
*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).
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 incre-
ment requirement of 2500 pieces. Nonstandard versions have an
order increment requirement of 10,000 pieces. Contact factory for
availability of nonstandard versions.
*See Figure 1 for operation.
MAX6323_UT__-T
MAX6324_UT__-T
SUFFIX
8 Factory-Trimmed Timing Options
and +5.0V Power Supplies
A
B
C
D
G
H
E
F
PART*
MAX
719
1.5
15
15
15
15
23
39
WATCHDOG TIMEOUT*
-40°C to +125°C 6 SOT23-6
-40°C to +125°C
FAST
Ordering Information
RANGE
TEMP
UNITS
Watchdog Timeout
ms
ms
ms
ms
ms
ms
ms
ms
CC
PIN-
PACKAGE
6 SOT23-6
= +1.2V
MIN
100
300
1.3
10
10
60
47
82
Features
SLOW
Open Drain
Push-Pull
OUTPUT
RESET
UNITS
ms
ms
s
s
1
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