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MAX6302CPA

P1-P3P4-P6P7-P9P10-P12
_______________General Description
The MAX6301–MAX6304* low-power microprocessor
(µP) supervisory circuits provide maximum adjustability
for reset and watchdog functions. The reset threshold
can be adjusted to any voltage above 1.22V, using
external resistors. In addition, the reset and watchdog
timeout periods are adjustable using external capaci-
tors. A watchdog select pin extends the watchdog time-
out period to 500x. The reset function features immunity
to power-supply transients.
These four devices differ only in the structure of their reset
outputs (see the
Selector Guide
). The MAX6301–MAX6304
are available in the space-saving 8-pin µMAX
®
package,
as well as 8-pin PDIP and SO packages.
Applications
Medical Equipment Embedded Controllers
Intelligent Instruments Critical µP Monitoring
Portable Equipment Set-Top Boxes
Battery-Powered Computers
Computers/Controllers
____________________________Features
o Adjustable Reset Threshold
o Adjustable Reset Timeout
o Adjustable Watchdog Timeout
o 500x Watchdog Timeout Multiplier
o 4µA Supply Current
o RESET or RESET Output Options
o Push-Pull or Open-Drain Output Options
o Guaranteed RESET Asserted At or Above
V
CC
= 1V (MAX6301/MAX6303)
o Power-Supply Transient Immunity
o Watchdog Function can be Disabled
o PDIP/SO/µMAX Packages Available
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
________________________________________________________________
Maxim Integrated Products
1
0.1µF
MAX6301
MAX6302
MAX6303
MAX6304
V
CC
RESET IN
V
IN
C
SWT
C
SRT
SRT
GND
SWT
WDI
WDS
RESET
µP
I/O
RESET
(RESET)
R2
R1
R
L
R
L
MAX6301
ONLY
MAX6302
ONLY
8
7
6
5
1
2
3
4
WDS = 0 FOR NORMAL MODE
WDS = 1 FOR EXTENDED MODE
( ) ARE FOR MAX6302/MAX6304.
Pin Configuration
1
2
8
7
V
CC
RESET (RESET)
WDI
WDS
RESET IN
GND
SRT
SWT
MAX6301
MAX6302
MAX6303
MAX6304
DIP/SO/µMAX
TOP VIEW
3
4
6
5
( ) ARE FOR MAX6302/MAX6304.
Typical Operating Circuit
19-1078; Rev 4; 9/10
Ordering Information
Ordering Information continued at end of data sheet.
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.
Selector Guide
FEATURE MAX6301 MAX6302 MAX6303 MAX6304
Acti ve-Low
Reset
√ — √ —
Acti ve-H i g h
Reset
— √ — √
Op en- D rai n
Reset Outp ut
√√——
P ush- P ul l
Reset Outp ut
—— √√
P i n- P ackag e
8- PD IP /S O/
µM AX
8- PD IP /S O/
µM AX
8- PD IP /S O/
µM AX
8- PD IP /S O/
µM AX
µMAX is a registered trademark of Maxim Integrated Products, Inc.
PART TEMP RANGE PIN-PACKAGE
MAX6301CPA 0°C to +70°C 8 PDIP
MAX6301CSA 0°C to +70°C 8 SO
MAX6301CUA 0°C to +70°C 8 µMAX
MAX6301EPA -40°C to +85°C 8 PDIP
MAX6301ESA -40°C to +85°C 8 SO
Devices are available in both leaded and lead(Pb)-free/RoHS-
compliant packaging. Specify lead-free by adding the “+
”
symbol at the end of the part number when ordering.
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +2V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
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.
V
CC ....................................................................................
-0.3V to +7.0V
RESET IN, SWT, SRT..................................-0.3V to (V
CC
+ 0.3V)
WDI, WDS..............................................................-0.3V to +7.0V
RESET, RESET
MAX6301… .......................................................-0.3V to +7.0V
MAX6302/MAX6303/MAX6304...............-0.3V to (V
CC
+ 0.3V)
Input Current
V
CC
...............................................................................±20mA
GND..............................................................................±20mA
Output Current
RESET, RESET..............................................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
PDIP (derate 9.09mW/°C above +70°C)......................727mW
SO (derate 5.88mW/°C above +70°C).........................471mW
µMAX (derate 4.10mW/°C above +70°C) ....................330mW
Operating Temperature Range
MAX630_C_A......................................................0°C to +70°C
MAX630_E_A ...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°C
Containing Lead (Pb)...................................................+240°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6301C/MAX6303C 1.00 5.50
MAX6301E/MAX6303E 1.20 5.50
Operating Voltage Range
(Note 1)
V
CC
MAX6302/MAX6304 1.31 5.50
V
Supply Current (Note 2) I
CC
No load 4.0 7.0 µA
RESET TIMER
V
RESET IN
falling, V
CC
= 5.0V 1.195 1.220 1.245
Reset Input Threshold Voltage V
TH
V
RESET IN
rising, V
CC
= 5.0V 1.240 1.265
V
Reset Input Hysteresis V
HYST
20 mV
Reset Input Leakage Current I
RESET IN
±0.01 ±1 nA
V
CC
≥ 4.5V, I
SOURCE
= 0.8mA V
CC
- 0.4
V
CC
= 2V, I
SOURCE
= 0.4mA V
CC
- 0.4
Reset Output-Voltage High
(MAX6302/MAX6303/MAX6304)
V
OH
MAX6302/MAX6304, V
CC
= 1.31V,
R
L
= 10kΩ
V
CC
-
0.3
V
V
CC
≥ 4.5V, I
SINK
= 3.2mA 0.4
V
CC
= 2V, I
SINK
= 1.6mA 0.4
V
CC
= 1V, I
SINK
= 50µA,
T
A
= 0°C to +70°C
0.3
Reset Output-Voltage Low
(MAX6301/MAX6303/MAX6304
V
OL
MAX6301/
MAX6303
V
CC
= 1.2V, I
SINK
= 100µA,
T
A
= -40°C to +85°C
0.3
V
V
CC
to Reset Delay t
RD
V
CC
= falling at 1mV/µs 63 µs
Reset Input Pulse Width t
RI
Comparator overdrive = 50mV 26 µs
Reset Timeout Period (Note 3) t
RP
C
SRT
= 1500pF 2.8 4.0 5.2 ms
MAX6301, V
RESET
= V
CC
±1
Reset Output Leakage Current
MAX6302, V
RESET
= V
GND
±1
µA
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
_______________________________________________________________________________________
3
10,000
0
0.001 0.01 0.1 1 10 100 1000
RESET TIMEOUT PERIOD
vs. C
SRT
1
MAX6301-4 toc01
C
SRT
(nF)
RESET TIMEOUT PERIOD (ms)
10
100
1000
V
CC
= 5V
10,000
0
0.001 0.01 0.1 1 10 100 1000
EXTENDED-MODE
WATCHDOG TIMEOUT PERIOD vs. C
SWT
(WDS = V
CC
)
1
MAX6301-4 toc02
C
SWT
(nF)
WATCHDOG TIMEOUT PERIOD (s)
10
100
1000
V
CC
= 5V
10,000
0.1
0.001 0.01 0.1 1 10 100 1000
NORMAL-MODE
WATCHDOG TIMEOUT PERIOD vs. C
SWT
(WDS = GND)
1
MAX6301-4 toc03
C
SWT
(nF)
WATCHDOG TIMEOUT PERIOD (ms)
10
100
1000
V
CC
= 5V
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
Note 1: Reset is guaranteed valid from the selected reset threshold voltage down to the minimum V
CC
.
Note 2: WDS = V
CC
, WDI unconnected.
Note 3: Precision timing currents of 500nA are present at both the SRT and SWT pins. Timing capacitors connected to these nodes
must have low leakage consistent with these currents to prevent timing errors.
Note 4: The sink/source is supplied through a resistor, and is proportional to V
CC
(Figure 8). At V
CC
= 2V, it is typically ±24µA.
__________________________________________Typical Operating Characteristics
(C
SWT
= C
SRT
= 1500pF, T
A
= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
WATCHDOG TIMER
V
IH
0.7 x V
CC
WDI, WDS Input Threshold
V
IL
0.3 x V
CC
V
V
CC
= 4.5V to 5.5V 30
WDI Pulse Width t
WP
V
CC
= 2V to 4.5V 60
ns
WDI, WDS Leakage Current Extended mode disabled ±1 µA
WDI Sink/Source Current (Note 4) Extended mode enabled ±70 µA
WDS = GND, C
SWT
= 1500pF 2.8 4.0 5.2 ms
Watchdog Timeout Period
(Note 3)
t
WD
WDS = V
CC
, C
SWT
= 1500pF 1.4 2.0 2.6 s
P1-P3P4-P6P7-P9P10-P12

MAX6302CPA

Mfr. #:
Buy MAX6302CPA
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits +5V, Low-Power, P Supervisory Circuits with Adjustable Reset/Watchdog
Lifecycle:
New from this manufacturer.
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