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Part: MAX6304CSA
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX6301, MAX6302, MAX6303, MAX6304 +5V, Low-Power, µP Supervisory Circuits With Adjustable Reset/watchdog
Company: Maxim Integrated Products
Datasheet: Download MAX6304CSA datasheet File size : 560 kB
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Datasheet text preview:
R
19-1078; Rev 0; 6/96
+5V, Low-Power µP Supervisory Circuits with Adjustable Reset/Watchdog
_______________General Description
T h e MAX6301/MAX6302/MAX6303/MAX6304* lowpower 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 r e s e t and watchdog timeout periods are adjustable u s i n g external capacitors. A watchdog select pin extends the watchdog timeout 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 Selector Guide). The MAX6301MAX6304 are available in the space-saving 8-pin µMAX package, as well as 8-pin DIP/SO.
____________________________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
MAX6301MAX6304
ESET Output Options
o Push/Pull or Open-Drain Output Options o Guaranteed RESET Asserted At or Above VCC = 1V (MAX6301/MAX6303) o Power-Supply Transient Immunity o Watchdog Function Can Be Disabled o DIP/SO/µMAX Packages Available
________________________Applications
Medical Equipment Intelligent Instruments Portable Equipment Battery-Powered Computers/Controllers Embedded Controllers Critical µP Monitoring Set-Top Boxes Computers
______________Ordering Information
PART MAX6301CPA MAX6301CSA MAX6301CUA MAX6301EPA TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE 8 Plastic DIP 8 SO 8 µMAX 8 Plastic DIP
_____________________Selector Guide
FEATURE Active-Low Reset Active-High Reset Open-Drain Reset Output Push/Pull Reset Output Pins-Package MAX6301 MAX6302 MAX6303 MAX6304 -- -- -- -- -- -- -- --
MAX6301ESA -40°C to +85°C 8 SO Ordering Information continued at end of data sheet.
__________Typical Operating Circuit
VIN MOX6301 A NLY R1 1 R2 2 GND ( RESET 7 RESET) RL MOX6302 A NLY I/O RESET µP RESET IN VCC 8 RL 0.1µF
8-DIP/SO/ 8-DIP/SO/ 8-DIP/SO/ 8-DIP/SO/ µMAX µMAX µMAX µMAX
__________________Pin Configuration
TOP VIEW
RESET IN 1 GND 2 S S RT 3 WT 4 8 R VCC ESET (RESET) WDI DS
MAX6301 MAX6302 MAX6303 AX6304
DIP/SO/µMAX
7 6 5
MAX6301 MAX6302 3 WDI 6 SRT MAX6303 4 5 SWT AX6304 WDS
CSRT CSWT
WDS = 0 FOR NORMAL MODE WDI = 1 FOR EXTENDED MODE ( ) ARE FOR MAX6302/MAX6304.
( ) ARE FOR MAX6302/MAX6304.
* Patents pending
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
+5V, Low-Power µP Supervisory Circuits with Adjustable Reset/Watchdog MAX6301MAX6304
ABSOLUTE MAXIMUM RATINGS
VCC .....-0.3V to +7.0V RESET IN, SWT, SRT ..........-0.3V to (VCC + 0.3V) WDI, WDS.....-0.3V to +7.0V RESET, RESET MAX6301 ..-0.3V to +7.0V MAX6302/6303/6304 ......-0.3V to (VCC + 0.3V) Input Current VCC .......±20mA GND ......±20mA Output Current RESET, RESET.....±20mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (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 Ranges 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, 10sec) .....+300°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.
ELECTRICAL CHARACTERISTICS
(VCC = +2V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) PARAMETER Operating Voltage Range (Note 1) Supply Current (Note 2) RESET TIMER Reset Input Threshold Voltage Reset Input Hysteresis Reset Input Leakage Current Reset Output Voltage High (MAX6302/MAX6303/MAX6304) VTH VHYST IRESET IN VCC 4.5V, ISOURCE = 0.8mA VOH VCC = 2V, ISOURCE = 0.4mA MAX6302/MAX6304, VCC = 1.31V, RL = 10k VCC 4.5V, ISINK = 3.2mA VCC = 2V, ISINK = 1.6mA Reset Output Voltage Low (MAX6301/MAX6303/MAX6304) VOL MAX6301/ MAX6303 VCC = 1V, ISINK = 50µA, TA = 0°C to +70°C VCC = 1.2V, ISINK = 100µA, TA = -40°C to +85°C 63 26 2.8 4.0 5.2 ±1 ±1 VCC - 0.3 0.4 0.4 0.3 0.3 µs µs ms µA V VCC - 0.4 VCC - 0.4 V VRESET IN falling, VCC = 5.0V VRESET IN rising, VCC = 5.0V 1.195 1.220 1.240 20 ±0.01 ±1 1.245 1.265 V mV nA SYMBOL VCC ICC CONDITIONS MAX6301C/MAX6303C MAX6301E/MAX6303E MAX6302/MAX6304 No load MIN 1.00 1.20 1.31 4.0 TYP MAX 5.50 5.50 5.50 7.0 µA V UNITS
VCC to Reset Delay Reset Input Pulse Width Reset Timeout Period (Note 3) Reset Output Leakage Current
tRD tRI tRP
VCC falling at 1mV/µs Comparator overdrive = 50mV CSRT = 1500pF MAX6301, V RESET = VCC MAX6302, VRESET = GND
2
_______________________________________________________________________________________
+5V, Low-Power µP Supervisory Circuits with Adjustable Reset/Watchdog
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) PARAMETER WATCHDOG TIMER WDI, WDS Input Threshold WDI Pulse Width WDI, WDS Leakage Current WDI Sink/Source Current (Note 4) Watchdog Timeout Period (Note 3) tWD VIH VIL tWP VCC = 4.5V to 5.5V VCC = 2V to 4.5V Extended mode disabled Extended mode enabled WDS = GND, CSWT = 1500pF WDS = VCC, CSWT = 1500pF 2.8 1.4 ±70 4.0 2.0 5.2 2.6 30 60 ±1 0.7VCC 0.3VCC V ns µA µA ms sec SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6301MAX6304
Note 1: Reset is guaranteed valid from the selected reset threshold voltage down to the minimum VCC. Note 2: VDS = VCC, 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 VCC (Figure 8). At VCC = 2V, it is typically ±24µA.
__________________________________________Typical Operating Characteristics
(CSWT = CSRT = 1500pF, TA = +25°C, unless otherwise noted.)
W RESET TIMEOUT PERIOD vs. CSRT
6301-4 TOC-01
EXTENDED-MODE ATCHDOG TIMEOUT PERIOD vs. CSWT ( WDS = VCC)
6301-4 TOC-02
W
NORMAL-MODE ATCHDOG TIMEOUT PERIOD vs. CSWT ( WDS = GND)
6301-4 TOC-03
10,000 RESET TIMEOUT PERIOD (ms)
10,000 WATCHDOG TIMEOUT PERIOD (sec)
WATCHDOG TIMEOUT PERIOD (ms)
VCC = 5V
VCC = 5V
10,000
VCC = 5V
1000
1000
1000
100
100
100
10
10
10
1
1
1
0 0.001 0.01 0.1 1 CSRT (nF) 10 100 1000
0 0.001 0.01 0.1 1 CSWT (nF) 10 100 1000
0.1 0.001 0.01 0.1 1 CSWT (nF) 10 100 1000
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