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MAX6323 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX6323
Description  μP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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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 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).
Applications
Automotive
Industrial
Medical
Embedded Control Systems
Features
o Min/Max (Windowed) Watchdog,
8 Factory-Trimmed Timing Options
o Pulsed Open-Drain, Active-Low Watchdog Output
o Power-On Reset
o Precision Monitoring of +2.5V, +3.0V, +3.3V,
and +5.0V Power Supplies
o Open-Drain or Push-Pull RESET Outputs
o Low-Power Operation (23µA typ)
o Debounced Manual Reset Input
o Guaranteed Reset Valid to VCC = +1.2V
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
________________________________________________________________ Maxim Integrated Products
1
GND
VCC
WDI
16
5
MAX6323
MAX6324
SOT23
TOP VIEW
2
34
RESET
MR
WDPO
19-1838; Rev 2; 2/03
*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.
Pin Configuration
Ordering Information
Typical Operating Circuit appears at end of data sheet.
RESET
OUTPUT
PIN-
PACKAGE
TEMP
RANGE
PART*
MAX6323_UT__-T
-40°C to +125°C 6 SOT23-6
Push-Pull
Open Drain
6 SOT23-6
-40°C to +125°C
MAX6324_UT_ _-T
WATCHDOG TIMEOUT*
SUFFIX
A
B
C
D
E
F
G
H
719
39
23
15
15
15
15
1.5
MAX
FAST
UNITS
ms
ms
ms
ms
ms
ms
ms
ms
SLOW
MIN
UNITS
ms
10
100
300
10
60
s
ms
47
82
1.3
s
*See Figure 1 for operation.
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.
Watchdog Timeout




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