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MAX6324AUT31+T

P1-P3P4-P6P7-P9P10-P12P13-P13
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 V
CC
= +1.2V.
The RESET output is either push-pull (MAX6323) or
open-drain (MAX6324). RESET is asserted low when
V
CC
falls below the reset threshold, or when the manual
reset input (MR) is asserted low. RESET remains assert-
ed for at least 100ms after V
CC
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 V
CC
= +1.2V
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
________________________________________________________________
Maxim Integrated Products
1
GND
V
CC
WDI
16
5
MAX6323
MAX6324
SOT23
TOP VIEW
2
34
RESET
MR
WDPO
19-1838; Rev 6; 1/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
*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 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.
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.
Watchdog Timeout
PART
TEMP
RANGE
PIN-
PACKAGE
RESET
OUTPUT
MAX6323_UT_ _-T -40°C to +125°C 6 SOT23 Push-Pull
Ordering Information continued at end of data sheet.
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= full range, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= 3V, T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND)
V
CC
..................................................................-0.3V to +6.0V
MR, RESET (MAX6323), WDI................-0.3V to (V
CC
+ 0.3V)
WDPO, RESET (MAX6324) ..............................-0.3V to +6.0V
Input Current, V
CC
, WDI, MR ..............................................20mA
Output Current, RESET, WDPO ..........................................20mA
Rate of Rise, V
CC
............................................................100V/µs
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)..........696mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-Free ............................................................+260°C
Containing Lead.........................................................+240°C
PARAMETER SYMBOL MIN TYP MAX UNITS
4.25 4.38 4.50
4.50 4.63 4.75
Supply Current I
CC
27 57
µA
Operating Voltage Range 1.2 5.5V
CC
V
V
CC
= 5.5V
V
CC
= 2.5V or 3.3V 23 45
µA1
V
RESET
= V
WDPO
= +5.5V, RESET, WDPO
deasserted
I
LKG
WDPO, RESET Output Leakage
V
V
CC
- 1.5
I
SOURCE
= 800µA, V
CC
= 4.75V, RESET
deasserted, (MAX632_ _UT44, MAX632_ _UT46)
V
OH
RESET Output Voltage
(MAX6323)
0.8 x V
CC
I
SOURCE
= 500µA, V
CC
= 3.15V, RESET
deasserted (MAX632_ _UT23, MAX632_ _UT26,
MAX632_ _UT29, MAX632_ _UT31)
V
0.4
I
SINK
= 100µA, V
CC
> 1.2V, RESET asserted
V
OL
WDPO, RESET Output Voltage
0.4
I
SINK
= 3.2mA, V
CC
= 4.25V (MAX632_ _UT44,
MAX632_ _UT46)
0.4
I
SINK
= 1.2mA, V
CC
= 2.25V (MAX632_ _UT23,
MAX632_ _UT26, MAX632_ _UT29,
MAX632_ _UT31)
µs2010mV/ms, V
TH
+100mV to V
TH
- 100mV
V
CC
to RESET Delay
ms100 180 280
RESET deasserted
t
RP
Reset Timeout Delay
V
2.25 2.32 2.38
CONDITIONS
MAX632_ _UT23
V
TH
Reset Threshold Voltage
MAX632_ _UT44
MAX632_ _UT46
No load, RESET
deasserted
2.55 2.63 2.70MAX632_ _UT26
2.85 2.93 3.00MAX632_ _UT29
3.00 3.08 3.15MAX632_ _UT31
MR Input Voltage
MR Minimum Pulse Width
MR Glitch Immunity
MR to Reset Delay
MR Pullup Resistance
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
_______________________________________________________________________________________ 3
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= full range, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= 3V, T
A
= +25°C.) (Note 1)
Note 1: Devices are tested at T
A
= +25°C and guaranteed by design for T
A
= T
MIN
to T
MAX
, as specified.
Note 2: WDPO will pulse low if a falling edge is detected on WDI before this timeout period expires.
Note 3: To avoid a potential fake fault, the first WDI pulse after the rising edge of RESET or WDPO will not create a fast watchdog
timeout fault.
Note 4: WDPO will pulse low if no falling edge is detected on WDI after this timeout period expires.
MAX632_AUT_ _ 1 1.5
MAX632_BUT_ _ 10 15
MAX632_CUT_ _ 10 15
MAX632_DUT_ _ 10 15
MAX632_EUT_ _ 10 15
MAX632_FUT_ _ 17 23
MAX632_GUT_ _ 29 39
Watchdog Timeout (Fast)
(Notes 2, 3)
MAX632_HUT_ _ 543 719
mst
WD1
MAX632_AUT_ _ 10 15
MAX632_BUT_ _ 100 150
MAX632_CUT_ _ 300 450
ms
MAX632_DUT_ _ 10 15
MAX632_EUT_ _ 60 90
s
MAX632_FUT_ _ 47 63
MAX632_GUT_ _ 82 108
ms
t
WD2
MAX632_HUT_ _ 1.3 1.8 s
Watchdog Timeout (Slow)
(Note 4)
300 ns
WDI Glitch Immunity V
CC
= 5.5V 100 ns
V
IH
0.75 x V
CC
WDI Input Voltage
V
IL
0.8
V
V
WDI
= 0V -1.5 -1
WDI Input Current
V
WDI
= V
CC
1 1.5
µA
V
IL
= 0.8V, V
IH
= 0.75V x V
CC
0.5 1 3 ms
V
IH
0.7 x V
CC
V
IL
0.3 x V
CC
V
1 µs
V
CC
= 2.5V 100 ns
V
CC
= 2.5V 120 ns
50 85 kΩ
Minimum Watchdog Input
Pulse Width
WATCHDOG INPUT AND OUTPUT
MANUAL RESET INPUT
WDPO Pulse Width
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX6324AUT31+T

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Buy MAX6324AUT31+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits uPower Supervisor
Lifecycle:
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