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MAX7705CSA+T

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MAX7705CSA+T

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Part Number MAX7705CSA+T
Manufacturer Maxim Integrated
Description IC MPU SUPPLY MON 8-SOIC
Datasheet MAX7705CSA+T Datasheet
Package 8-SOIC (0.154", 3.90mm Width)
In Stock 22,418 piece(s)
Unit Price $ 1.5675 *
Lead Time Can Ship Immediately
Estimated Delivery Time Jun 3 - Jun 8 (Choose Expedited Shipping)
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Part Number # MAX7705CSA+T (PMIC - Supervisors) is manufactured by Maxim Integrated and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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MAX7705CSA+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Supervisors
Datasheet MAX7705CSA+TDatasheet
Package8-SOIC (0.154", 3.90mm Width)
Series-
TypeSimple Reset/Power-On Reset
Number of Voltages Monitored1
OutputPush-Pull, Totem Pole
ResetActive Low
Reset Timeout140 ms Minimum
Voltage - Threshold4.65V
Operating Temperature0°C ~ 70°C (TA)
Mounting TypeSurface Mount
Package / Case8-SOIC (0.154", 3.90mm Width)
Supplier Device Package8-SOIC

MAX7705CSA+T Datasheet

Page 1

Page 2

_______________General Description In applications with microprocessors (µPs) that have a RESET input, the MAX7705 is functionally and socket compatible with the TL7705, but requires no external components. It provides power-supply glitch immunity and a guaranteed power-up reset delay, while typically consuming 1/27th the power from a +5V supply. The MAX7705 monitors the power supply in µP and digital systems. The RESET output is valid for VCC down to 1V. The device offers excellent circuit reliability and low cost by eliminating external components and adjustments. A system reset is provided during power-up, power- down, and brownout conditions. When VCC is below the reset threshold, RESET is low and holds the µP in reset. RESET will go high 280ms after VCC rises above the reset threshold. The MAX7705 is available in 8-pin DIP and SO packages. ________________________Applications Minimum Component Count, Low-Cost Processor Systems ____________________________Features ♦ No External Components ♦ Low Cost ♦ Precise Reset Threshold ♦ 280ms Power-On Reset Delay ♦ 8-Pin DIP and SO Packages ______________Ordering Information * Contact factory for dice specifications. M A X 7 7 0 5 µP Power-Supply Monitor with Reset ________________________________________________________________ Maxim Integrated Products 1 1 2 3 4 8 7 6 5 VCC N.C. N.C. RESETGND N.C. N.C. N.C. MAX7705 VCC RESET GND µP * * * * THE MAX7705 ELIMINATES THREE EXTERNAL COMPONENTS REQUIRED BY THE TL7705. __________________Pin Configuration 1 2 3 4 8 7 6 5 VCC N.C. N.C. RESETGND N.C. N.C. N.C. MAX7705 DIP/SO TOP VIEW __________Typical Operating Circuit Call toll free 1-800-998-8800 for free samples or literature. 19-0151; Rev 0; 6/93 PART TEMP. RANGE PIN-PACKAGE MAX7705CPA 0°C to +70°C 8 Plastic DIP MAX7705CSA 0°C to +70°C 8 SO MAX7705C/D 0°C to +70°C Dice* FEATURE MAX7705 TL7705 No. of External Components Required 0 3 Operating Supply Current 65µA 1.8mA Power-Supply Glitch Immunity Yes No Guaranteed Minimum Reset Delay Yes No +5V +3V 35µA 1.8mA MAX7705EPA -40°C to +85°C 8 Plastic DIP MAX7705ESA -40°C to +85°C 8 SO

Page 3

M A X 7 7 0 5 µP Power-Supply Monitor with Reset 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) VCC ......................................................................-0.3V to 6.0V RESET....................................................-0.3V to (VCC + 0.3V) Input Current, VCC ..............................................................20mA Output Current, RESET ......................................................20mA Rate-of-Rise, VCC ............................................................100V/µs Continuous Power Disipation (TA = +70°C) Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW SO (derate 5.88mW/°C above +70°C).........................471mW Operating Temperature Ranges: MAX7705C_ _ .....................................................0°C to +70°C MAX7705E_ _ ..................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C ELECTRICAL CHARACTERISTICS (VCC = full range, TA = TMIN to TMAX, unless otherwise noted.) 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. PARAMETER CONDITIONS MIN TYP MAX UNITS MAX7705C 1.0 5.5 VCC Range MAX7705E 1.2 5.5 V MAX7705C, VCC < 5.5V 65 150 Supply Current MAX7705E, VCC < 5.5V 65 200 µA RESET Threshold 4.50 4.65 4.75 V VCC to RESET Delay VCC = reset threshold max to reset threshold min 20 µs Reset Active Timeout Period VCC = reset threshold max, VCC rising 140 280 560 ms ISINK = 3.2mA, VCC = reset threshold min 0.4 V ISINK = 50µA, VCC ≥ 1.0V, MAX7705C 0.3 RESET Output Voltage ISOURCE = 800µA, VCC ≥ reset threshold max VCC - 1.5 ISINK = 100µA, VCC ≥ 1.2V, MAX7705E 0.4

Page 4

M A X 7 7 0 5 µP Power-Supply Monitor with Reset _______________________________________________________________________________________ 3 24 0 -60 100 POWER-DOWN RESET DELAY vs. TEMPERATURE 4 20 TEMPERATURE (°C) P O W E R -D O W N R E S E T D E L A Y ( µs ) 60 12 8 -20 20 16 VCC STEPPED FROM RESET THRESHOLD MAX TO RESET THRESHOLD MIN 300 0 -60 100 POWER-UP RESET DELAY vs. TEMPERATURE 50 250 TEMPERATURE (°C) P O W E R -U P R E S E T D E L A Y ( m s) 60 150 100 -20 20 200 VCC = RESET THRESHOLD MAX VCC RISING 100 20 -60 -20 60 100 SUPPLY CURRENT vs. TEMPERATURE 40 80 TEMPERATURE (°C) S U P P L Y C U R R E N T ( µA ) 20 60 0 NOTE: STEADY-STATE SUPPLY CURRENT IS INDEPENDENT OF RESET OUTPUT STATUS NO LOAD VCC = +5V VCC = +4V VCC = +3V VCC = +2V VCC = +1V 4.640 -60 -20 60 100 RESET THRESHOLD vs. TEMPERATURE 4.650 TEMPERATURE (°C) R E S E T T H R E S H O L D ( V ) 20 4.660 4.630 4.655 4.645 4.665 4.635 __________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) ______________________________________________________________Pin Description PIN NAME FUNCTION 1,2,3,6,7 N.C. No Connection. There is no internal connection to these pins. 4 GND Ground 5 RESET Reset Output remains low while VCC is below the reset threshold, and for 280ms after VCC rises above the reset threshold. 8 VCC +5V Supply Voltage

Page 5

M A X 7 7 0 5 µP Power-Supply Monitor with Reset 4 _______________________________________________________________________________________ __________Applications Information Replacing the TL7705 with a MAX7705 in an Existing Design The MAX7705 has only three active pins: VCC, GND, and RESET. When using a TL7705 with a µP that has a RESET input, simply plug the MAX7705 into the same socket and omit the RESET pull-up resistor, reset timing capacitor, and reference bypass capacitor (see the Typical Operating Circuit). The MAX7705 monitors the VCC voltage and asserts reset whenever VCC falls below the reset threshold. The reset power-up delay is created by an internal fixed oscillator. This delay is 100% tested and guaran- teed over the full temperature range. The RESET out- put both sources and sinks current (see RESET Output Voltage in the Electrical Characteristics). Negative-Going VCC Transients The MAX7705 asserts RESET during power-up, power-down, and brownout conditions. However, it is relatively immune to short-duration negative-going VCC transients (glitches). Figure 1 shows typical transient duration vs. reset com- parator overdrive for which the MAX7705 does not gen- erate a reset pulse. The graph was generated using a fast-edge, negative-going pulse applied to VCC, starting 1.5V above the actual reset threshold and ending below the reset threshold by the magnitude indicated (reset comparator overdrive). It indicates the typical maxi- mum pulse width a negative-going VCC transient may have without causing a reset pulse to be issued. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 40µs or less will not cause a reset pulse to be issued. A 0.1µF bypass capacitor mounted as close as possible to pin 2 (VCC) provides additional transient immunity. Ensuring a Valid RESET Output Down to VCC = 0V When VCC falls below 1V, the MAX7705 RESET output no longer sinks current; it becomes high impedance. Therefore, high-impedance CMOS logic inputs con- nected to the RESET output can drift to indeterminate voltages. In most applications this presents no prob- lem, as µP and other circuitry is generally inoperative with VCC below 1V. In applications where the RESET output must be valid down to 0V, adding a pull-down resistor to the RESET pin (as shown in Figure 2) will cause any stray leakage currents to flow to ground, holding RESET low. The resistance value of R1 is not critical. It should be about 100kΩ , which is large enough not to load RESET and small enough to pull RESET to ground. 150 0 10 100 10k 50 100 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV) M A X IM U M T R A N S IE N T D U R A T IO N ( µs ) 1k TA = +25°C 10ns R1 VCC GND MAX7705 RESET Figure 1. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive Figure 2. RESET Valid to VCC = Ground Circuit

Page 6

___________________Chip Topography TRANSISTOR COUNT = 380; SUBSTRATE CONNECTED TO VCC. M A X 7 7 0 5 µP Power-Supply Monitor with Reset _______________________________________________________________________________________ 5 4.7k VCC GND RESET MAX7705 RESET VCC GND µP BUFFER BUFFERED RESET TO OTHER SYSTEM COMPONENTS Figure 3. Interfacing to µPs with Bidirectional Reset I/O Interfacing to µPs with Bidirectional Reset Inputs µPs with bidirectional reset pins, such as Motorola’s 68HC11 series, can contend with the MAX7705 reset output. If, for example, the MAX7705 RESET output is asserted high and the µP wants to pull it low, an inde- terminate logic level may result. To correct this, con- nect a 4.7kΩ resistor between the MAX7705 RESET output and the µP reset I/O, as in Figure 3. Buffer the RESET signal to other system components. RESET VCC GND 0.045" (1.143mm) 0.056" (1.422mm)

Page 7

M A X 7 7 0 5 µP Power-Supply Monitor with Reset 6 _______________________________________________________________________________________ C A A2 E1D E eA eB A3 B1 B DIM A A1 A2 A3 B B1 C D D1 E E1 e eA eB L α MIN – 0.015 0.125 0.055 0.016 0.050 0.008 0.348 0.005 0.300 0.240 – 0.115 0˚ MAX 0.200 – 0.175 0.080 0.022 0.065 0.012 0.390 0.035 0.325 0.280 0.400 0.150 15˚ MIN – 0.38 3.18 1.40 0.41 1.27 0.20 8.84 0.13 7.62 6.10 – 2.92 0˚ MAX 5.08 – 4.45 2.03 0.56 1.65 0.30 9.91 0.89 8.26 7.11 10.16 3.81 15˚ INCHES MILLIMETERS 2.54 BSC 7.62 BSC 0.100 BSC 0.300 BSC A1L D1 e 21-324A α 8-PIN PLASTIC DUAL-IN-LINE PACKAGE _______________________________________________________Package Information

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M A X 7 7 0 5 µP Power-Supply Monitor with Reset _______________________________________________________________________________________ 7 L DIM A A1 B C D E e H h L α MIN 0.053 0.004 0.014 0.007 0.189 0.150 0.228 0.010 0.016 0˚ MAX 0.069 0.010 0.019 0.010 0.197 0.157 0.244 0.020 0.050 8˚ MIN 1.35 0.10 0.35 0.19 4.80 3.80 5.80 0.25 0.40 0˚ MAX 1.75 0.25 0.49 0.25 5.00 4.00 6.20 0.50 1.27 8˚ INCHES MILLIMETERS α 8-PIN PLASTIC SMALL-OUTLINE PACKAGE HE D e A A1 C h x 45˚ 0.127mm 0.004in. B 1.27 BSC0.050 BSC 21-325A __________________________________________ Package Information (continued)

MAX7705CSA+T Reviews

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Enz*****amb

May 23, 2020

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May 23, 2020

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May 20, 2020

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May 6, 2020

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May 4, 2020

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May 3, 2020

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April 18, 2020

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Nei*****all

April 16, 2020

Works just like the original one and even has the correct connectors installed.

Jayso*****vastava

April 16, 2020

This product is very easy to replace and solved my problem.

Dar***** Wolf

April 11, 2020

What I like was it was shipped fast and no damage.

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