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Part: MAX6426UK29-T
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX6340, MAX6421, MAX6422, MAX6423, MAX6424, MAX6425, MAX6426 Low-Power, SC70/SOT µP Reset Circuits With Capacitor-adjustable Reset Timeout Delay
Company: Maxim Integrated Products
Datasheet: Download MAX6426UK29-T datasheet File size : 13806 kB
Request For quote: Find where to buy MAX6426UK29-T
Datasheet text preview:
19-2440; Rev 2; 10/02
Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay
General Description
The MAX6340/MAX6421MAX6426 low-power microprocessor supervisor circuits monitor system voltages from 1.6V to 5V. These devices perform a single function: they assert a reset signal whenever the VCC supply voltage falls below its reset threshold. The reset output remains asserted for the reset timeout period after VCC rises above the reset threshold. The reset timeout is externally set by a capacitor to provide more flexibility. T h e MAX6421/MAX6424 have an active-low, pushpull reset output. The MAX6422 has an active-high, p u s h - p u l l reset output and the MAX6340/MAX6423/ M A X 6 4 2 5 / M A X 6 4 2 6 have an active-low, open-drain r e s e t output. The MAX6421/MAX6422/MAX6423 are o f f e r e d in 4-pin SC70 or SOT143 packages. The MAX6340/MAX6424/MAX6425/MAX6426 are available in 5-pin SOT23-5 packages.
Features
o Monitor System Voltages from 1.6V to 5V o Capacitor-Adjustable Reset Timeout Period o Low Quiescent Current (1.6µA typ) o Three RESET Output Options Push-Pull RESET Push-Pull RESET Open-Drain RESET o Guaranteed Reset Valid to VCC = 1V o Immune to Short VCC Transients o Small 4-Pin SC70, 4-Pin SOT143, and 5-Pin SOT23 Packages o MAX6340 Pin Compatible with LP3470 o MAX6424/MAX6425 Pin Compatible with NCP300NCP303, MC33464/MC33465, S807/S808/S809, and RN5VD o MAX6426 Pin Compatible with PST92XX
MAX6340/MAX6421MAX6426
Applications
Portable Equipment Battery-Powered Computers/Controllers Automotive Medical Equipment Intelligent Instruments Embedded Controllers Critical µP Monitoring Set-Top Boxes Computers
Ordering Information
PART MAX6340UK_ _-T MAX6421XS_ _-T MAX6421US_ _-T MAX6422XS_ _-T MAX6422US_ _-T MAX6423XS_ _-T MAX6423US_ _-T MAX6424UK_ _-T MAX6425UK_ _-T TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PIN-PACKAGE 5 SOT23-5 4 SC70-4 4 SOT143-4 4 SC70-4 4 SOT143-4 4 SC70-4 4 SOT143-4 5 SOT23-5 5 SOT23-5 5 SOT23-5
Pin Configurations
TOP VIEW
VCC 1 4 RESET (RESET)
MAX6426UK_ _-T
MAX6421X MAX6422X MAX6423X
GND 2 3
SRT
Note: The MAX6340/MAX6421MAX6426 are available with factory-trimmed reset thresholds from 1.575V to 5.0V in approxim a t e l y 0.1V increments. Insert the desired nominal reset threshold suffix (from Table 1) into the blanks. There are 50 standard versions with a required order increment of 2500 pieces. Sample stock is generally held on standard versions only (see Standard Versions Table). Required order increment is 10,000 pieces for nonstandard versions. Contact factory for availability. All devices are available in tape-and-reel only. Typical Operating Circuit appears at end of data sheet. Selector Guide appears at end of data sheet. 1
SC70
( ) ARE FOR THE MAX6422
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay
MAX6340/MAX6421MAX6426
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced to GND VCC ......-0.3V to +6.0V SRT, RESET, RESET (push-pull)........-0.3V to (VCC + 0.3V) RESET (open drain).....-0.3V to +6.0V Input Current (all pins)......±20mA Output Current (RESET, RESET) .....±20mA Continuous Power Dissipation (TA = +70°C) 4-Pin SC70 (derate 3.1mW/°C above +70°C) .....245mW 4-Pin SOT143 (derate 4mW/°C above +70°C)....320mW 5-Pin SOT23 (derate 7.1mW/°C above +70°C)...571mW Operating Temperature Range .......-40°C to +125°C Storage Temperature Range .....-65°C to +150°C Junction Temperature ......+150°C Lead Temperature (soldering, 10s) .........+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 = 1V to 5.5V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VCC = 5V and TA = +25°C.) (Note 1)
PARAMETER Supply Voltage Range Supply Current SYMBOL VCC VCC 5.0V ICC VCC 3.3V VCC 2.0V VCC Reset Threshold Accuracy Hysteresis VCC to Reset Delay Reset Timeout Period VSRT Ramp Current VSRT Ramp Threshold RAMP Threshold Hysteresis RESET Output Voltage Low VOL VTH V HYST tRD tRP IR A M P V TH-RAMP VCC falling at 1mV/µs CSRT = 1500pF C SRT = 0 VSRT = 0 to 0.65V; VCC = 1.6V to 5V VCC = 1.6V to 5V (VRAMP rising) VRAMP falling threshold VCC 1.0V, ISINK = 50µA VCC 2.7V, ISINK = 1.2mA VCC 4.5V, ISINK = 3.2mA RESET Output Voltage High, Push-Pull RESET Output Leakage Current, Open-Drain VCC 1.8V, ISOURCE = 200µA VOH VCC 2.25V, ISOURCE = 500µA VCC 4.5V, ISOURCE = 800µA ILKG VCC > VTH, reset not asserted VCC 1.0V, ISOURCE = 1µA RESET Output Voltage High VOH VCC 1.8V, ISOURCE = 150µA VCC 2.7V, ISOURCE = 500µA VCC 4.5V, ISOURCE = 800µA VCC 1.8V, ISINK = 500µA RESET Output Voltage Low VOL VCC 2.7V, ISINK = 1.2mA VCC 4.5V, ISINK = 3.2mA 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.3 0.3 0.4 V V 0.8 x VCC 0.8 x VCC 0.8 x VCC 1.0 µA V 3.00 TA = +25°C TA = -40°C to +125°C VTH - 1.5% VTH - 2.5% 80 4.375 0.275 240 0.65 33 0.3 0.3 0.4 V 5.75 CONDITIONS MIN 1.0 2.5 1.9 1.6 TYP MAX 5.5 4.2 3.4 2.5 VTH + 1.5% VTH + 2.5% V mV µs ms nA V mV µA UNITS V
4 x VTH
Note 1: Devices production tested at +25°C. Overtemperature limits are guaranteed by design.
2
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Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay
Typical Operating Characteristics
(VCC = 5V, CSRT = 1500pF, TA = +25°C, unless otherwise noted.)
MAX6340/MAX6421MAX6426
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6421/26 toc01
RESET TIMEOUT PERIOD vs. CSRT
MAX6421/26 toc02
RESET TIMEOUT PERIOD vs. TEMPERATURE
CSRT = 1500pF RESET TIMEOUT PERIOD (ms) 4.25
MAX6421/26 toc03 MAX6421/26 toc06
4.0 3.5 SUPPLY CURRENT (µA) 3.0 2.5 2.0 1.5 1.0 0.5 0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) TA = -40°C TA = +25°C TA = +125°C
10,000
4.30
RESET TIMEOUT PERIOD (ms)
1000
100
4.20
10
4.15
1
0.1 0.001
4.10 0.01 0.1 1 CSRT (nF) 10 100 1000 -50 -25 0 25 50 75 100 125 TEMPERATURE (°C)
RESET TIMEOUT PERIOD vs. TEMPERATURE
MAX6421/26 toc04
MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
MAX6421/26 toc05
VCC TO RESET DELAY vs. TEMPERATURE (VCC FALLING)
160 VCC FALLING AT 1mVµs 150 VCC TO RESET DELAY (µs) 140 130 120 110 100 90 80 1000 -50 -25 0 25 75 50 TEMPERATURE (°C) 100 125
600 550 RESET TIMEOUT PERIOD (µs) 500 450 400 350 300 250 200 -50 -25 0 25 50 75 100 CSRT = 0
175 150 TRANSIENT DURATION (µs) 125 100 75 50 25 VTH = 2.95V 0 RESET OCCURS ABOVE THE CURVE
125
0
200
400
600
800
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE (mV)
POWER-UP/POWER-DOWN CHARACTERISTIC
MAX6421/26 toc07
NORMALIZED RESET THRESHOLD vs. TEMPERATURE
MAX6421/26 toc08
NORMALIZED RESET THRESHOLD
VCC
VTH = 1.6V
1.006 1.004 1.002 1.000 0.998 0.996 0.994
1V/div
RESET 1V/div 400µs/div
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
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