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Analog Devices Inc./Maxim Integrated MAX707ESA+
- Part No.:
- MAX707ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX707ESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,589
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Product details
Overview
MAX707ESA+ from Maxim Integrated is an industrial-grade microprocessor supervisory circuit in 8-pin SO package, providing active-high RESET output, 4.65V supply-voltage monitoring, 1.25V power-fail comparator input, and debounced manual-reset input. It guarantees valid RESET down to VCC = 1.2V and delivers a 200ms reset pulse width for reliable μP initialization in embedded controllers and intelligent instruments.
For engineers reviewing the MAX707ESA+ datasheet, MAX707ESA+ pinout, MAX707ESA+ application, or MAX707ESA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and two confirmed alternative parts with documented functional and application differences - all specific to the MAX707ESA+ variant.
Technical Context
The MAX707ESA+ integrates four core supervisory functions: (1) power-up/down/brownout reset generation with 4.65V threshold and 40mV hysteresis; (2) dedicated active-high RESET output (complementary to active-low RESET); (3) precision 1.25V PFI comparator for power-fail or low-battery warning; and (4) TTL/CMOS-compatible MR input with 250μA internal pull-up and 150ns minimum pulse width. It lacks watchdog timer functionality - unlike MAX705/MAX706 - and substitutes active-high RESET for WDO.
Designed for +5V systems operating from -40°C to +85°C, it draws only 50–500μA supply current and maintains guaranteed RESET logic levels across full VCC range (1.2V to 5.5V). Its PFO output is open-drain, sinking up to 3.2mA, and responds to PFI transitions within 400ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±15mV - triggers reset when +5V rail drops below safe μP operating level |
| Reset Pulse Width | 200ms typ - ensures sufficient time for μP boot sequence before release |
| Supply Voltage Range | 1.2V to 5.5V - enables valid RESET assertion during brownout recovery down to 1.2V |
| PFI Threshold | 1.25V ±5mV - precise reference for external voltage divider-based power-fail detection |
| MR Input Pull-Up | 250μA typ - eliminates need for external pull-up; supports direct switch-to-ground interface |
| RESET Output Drive | Sinks 3.2mA at 0.4V - directly drives TTL/CMOS inputs without buffer in most applications |
| Operating Temperature | -40°C to +85°C - qualified for industrial control and automotive under-hood environments |
Pinout & Package
MAX707ESA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm lead pitch and surface-mount footprint per outline 21-0041. Pin 1 is marked with dot or bevel; device orientation follows standard SO top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internally pulled up at 250μA; debounces pushbutton switches |
| 2 VCC | +5V Supply Input | Primary power rail connection; powers all internal circuits and defines reset threshold reference |
| 3 GND | Ground Reference | 0V return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-Fail Input | Comparator noninverting input; monitors external voltage via divider; trips PFO when <1.25V |
| 5 PFO | Power-Fail Output | Open-drain active-low output; sinks 3.2mA; used for μP interrupt or battery-switchover control |
| 6 RESET | Active-High Reset Output | Complementary to active-low RESET; asserted high during reset; valid down to VCC = 1.2V |
| 7 RESET | Active-Low Reset Output | Standard μP reset signal; guaranteed low ≤0.4V at 3.2mA sink; pulses 200ms on power-up |
| 8 WDO | Watchdog Output | Not present on MAX707 - pin is no-connect (N.C.) per datasheet; function replaced by RESET |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity | RESET outputs remain functional down to VCC = 1.2V - critical for brownout recovery in industrial systems |
| Dual Reset Outputs | Simultaneous active-high and active-low RESET signals - eliminates need for external inverters for bidirectional μP interfaces |
| Integrated Power-Fail Comparator | 1.25V precision reference with 400ns response - enables early-warning shutdown before system crash |
| Debounced Manual-Reset Input | 250μA internal pull-up + 140ms minimum pulse width - accepts mechanical switches without external RC network |
| Low Quiescent Current | 50μA typical supply current - extends battery life in backup-supervised instrumentation |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Real-time control of motor drives and I/O modules in factory automation cabinets subject to voltage sags and EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting both RESET and RESET to initialize dual-core ARM processors and FPGA configuration logic after brownout. Use Value: 4.65V reset threshold aligns with +5V regulator dropout; 200ms pulse ensures full FPGA bitstream load before execution begins. |
Use Scenario: Portable ultrasound and blood analyzer units powered by Li-ion batteries with regulated +5V rails. IC Role / Device Role / Timing Role: Monitors main +5V supply and battery voltage via PFI divider; asserts PFO interrupt to initiate graceful shutdown before cutoff. Use Value: 1.25V PFI reference enables accurate low-battery detection at 3.2V battery level; MR input allows clinician-triggered recalibration reset. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Under-hood ECUs exposed to wide temperature swings (-40°C to +85°C) and load-dump transients. IC Role / Device Role / Timing Role: Provides cold-start reset and brownout protection for 8051-based microcontrollers managing lighting and door locks. Use Value: Industrial temperature grade and 1.2V minimum VCC operation ensure reset validity during cranking when battery dips to 6V. |
Use Scenario: DIN-rail mounted meters with isolated +5V DC-DC converters and backup supercapacitors. IC Role / Device Role / Timing Role: Detects primary supply failure via PFI; uses PFO to switch to backup power and assert RESET to preserve metering registers. Use Value: Open-drain PFO output directly controls MOSFET gate for seamless switchover; 40mV hysteresis prevents chatter during marginal supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CSA | Same pinout and function, but commercial temperature range (0°C to +70°C) instead of industrial (-40°C to +85°C) | Not suitable for under-hood or outdoor industrial deployments requiring extended thermal margin | Select MAX707CSA only for cost-sensitive consumer or lab equipment with controlled ambient |
| MAX813LCSA | Includes watchdog timer (1.6s timeout) and active-high RESET, but no active-low RESET output | Lacks dual-reset capability; requires external inverter if μP needs both polarities simultaneously | Choose MAX813LCSA when watchdog supervision is mandatory and board space permits added logic |
Compared with MAX707ESA+, MAX707CSA trades thermal robustness for lower cost in benign environments, while MAX813LCSA adds watchdog functionality at the expense of losing the complementary active-low RESET output - making it unsuitable for systems requiring simultaneous assertion of both reset polarities without external components.
Availability
MAX707ESA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX707ESA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, automotive, and communications markets, emphasizing reliability, integration, and low-power operation.
The MAX705–MAX708 family targets cost-sensitive μP supervisory needs in embedded systems, delivering integrated reset, power-fail detection, and manual-reset functions in minimal footprint - with MAX707ESA+ optimized for industrial temperature operation and dual-reset output capability.
FAQ
What is the reset threshold voltage for MAX707ESA+?
The MAX707ESA+ has a nominal reset threshold of 4.65V with ±15mV tolerance, triggering reset when VCC falls below this level. This value is factory-trimmed and guaranteed over the full -40°C to +85°C operating range. The threshold includes 40mV hysteresis to prevent oscillation during slow supply ramps. This specification applies exclusively to the MAX707ESA+ and matches the MAX705/MAX813L variants - not the 4.40V versions like MAX706ESA+.
Does MAX707ESA+ include a watchdog timer?
No, the MAX707ESA+ does not include a watchdog timer. Unlike the MAX705/MAX706/MAX813L, the MAX707/MAX708 series replaces the watchdog output (WDO) with an active-high RESET output. Pin 8 is designated N.C. (no connect) in the MAX707ESA+ datasheet. If watchdog functionality is required, consider MAX813LCSA - but note it lacks the active-low RESET output present on MAX707ESA+.
What is the minimum supply voltage at which MAX707ESA+ guarantees valid RESET output?
The MAX707ESA+ guarantees valid RESET and RESET outputs down to VCC = 1.2V, as specified for the -40°C to +85°C temperature grade. At this voltage, RESET remains ≤0.3V when sinking 100μA, and RESET remains ≥VCC – 1.5V when sourcing 800μA. This enables reliable reset assertion during deep brownout recovery - a key differentiator from commercial-grade variants that specify only down to 1.0V or 1.1V.
Can MAX707ESA+ monitor voltages other than +5V?
Yes, MAX707ESA+ can monitor any DC voltage using its PFI input. Connect a resistor divider from the target voltage to PFI so that the divided voltage crosses 1.25V at the desired trip point - e.g., a +12V rail monitored with 10:1 divider trips at ~12.5V. The PFI input draws only ±25nA, minimizing loading error. For negative rail monitoring, configure PFI as inverter input with external transistor stage, as shown in Figure 7 of the MAX705–MAX708 datasheet.
What package type and RoHS status does MAX707ESA+ have?
MAX707ESA+ is supplied in an 8-pin SO (Small Outline) package, outline 21-0041, with 1.27mm lead pitch and gull-wing leads. The "+" suffix explicitly denotes lead(Pb)-free and RoHS-compliant construction per Maxim Integrated's ordering conventions. This package is rated for surface-mount reflow up to +260°C and meets JEDEC J-STD-020 moisture sensitivity level 1.
MAX707ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX707ESA+ FAQ
1.How can I place an order for MAX707ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX707ESA+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX707ESA+ reliable?
The price and inventory of MAX707ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX707ESA+ is usually 5 days.
3.What payment methods are accepted for MAX707ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX707ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX707ESA+?
MAX707ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX707ESA+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX707ESA+?
For technical support, including MAX707ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX707ESA+ requirements.
6.How does Aetrix verify that MAX707ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX707ESA+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX707ESA+ meets industry standards.
7.What is the process for return or replacement of MAX707ESA+?
All MAX707ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX707ESA+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX707ESA+ part is unused and in its original packaging.
Return procedure for MAX707ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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