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Analog Devices Inc./Maxim Integrated MAX707CSA+
- Part No.:
- MAX707CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX707CSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:561
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Product details
Overview
MAX707CSA+ from Maxim Integrated is a microprocessor supervisory circuit providing active-high reset output, 4.65V supply-voltage monitoring, 1.25V power-fail comparator input, and manual-reset input - all in an 8-pin SO package. It ensures reliable μP startup and brownout protection for embedded controllers and intelligent instruments operating from +5V supplies.
For engineers reviewing the MAX707CSA+ datasheet, MAX707CSA+ pinout, MAX707CSA+ application, or MAX707CSA+ equivalent, this device delivers guaranteed RESET validity down to VCC = 1.1V, 200ms reset pulse width, debounced TTL/CMOS-compatible MR input, and precise 4.65V reset threshold with 40mV hysteresis - critical for deterministic system initialization and fail-safe power monitoring.
Technical Context
The MAX707CSA+ integrates a precision voltage monitor with 4.65V threshold and 40mV hysteresis, a 1.25V reference-based power-fail comparator (PFI/PFO), and a debounced manual-reset input (MR) with 250μA internal pull-up. Its active-high RESET output is valid down to VCC = 1.1V, and it guarantees a 200ms minimum reset pulse width after power-up or MR assertion.
Unlike the MAX705/MAX706 series, the MAX707CSA+ omits the watchdog timer and WDO output, substituting an active-high RESET output (pin 7) alongside the active-low RESET (pin 1). This dual-reset architecture supports μPs requiring active-high reset signals, such as Intel 80C51 derivatives, without external inversion logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - triggers reset when +5V supply drops below nominal regulation limit, ensuring safe μP halt before logic corruption. |
| Reset Pulse Width | 200ms typ - provides sufficient time for μP internal state stabilization and peripheral initialization during power-up. |
| Supply Voltage Range | 1.1V to 5.5V - enables valid RESET assertion even during deep brownout, supporting low-VCC fail-safe sequencing. |
| Power-Fail Threshold | 1.25V ±50mV - allows configurable early-warning detection of +5V rail collapse via external resistor divider on PFI. |
| Manual-Reset Input | TTL/CMOS-compatible with 250μA internal pull-up - eliminates external biasing and supports pushbutton or logic-driven reset initiation. |
| Quiescent Current | 50μA typ at VCC = 5V - minimizes standby power in battery-backed or energy-sensitive applications. |
Pinout & Package
MAX707CSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with standard 1.27mm pitch and gull-wing leads. The package is surface-mount compatible and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Open-drain output asserted low during power-up, brownout, or MR activation; requires external pull-up for logic-level compatibility. |
| 2 | VCC | +5V supply input; powers internal comparators, reset generator, and pull-up current source for MR. |
| 3 | GND | Ground reference for all analog and digital functions; must be low-impedance connection to minimize noise coupling. |
| 4 | PFI | Power-fail input referenced to 1.25V internal bandgap; used to monitor auxiliary voltages (e.g., +12V via divider) for early warning. |
| 5 | PFO | Open-drain power-fail output; sinks current when PFI < 1.25V - connects to μP interrupt or external logic for orderly shutdown. |
| 6 | N.C. | No internal connection; left unconnected per design - no routing or termination required. |
| 7 | RESET (active-high) | Push-pull output complementary to pin 1; drives high when reset condition is inactive - directly interfaces with active-high μP reset pins. |
| 8 | MR | Active-low manual-reset input with 250μA internal pull-up; debounced by 200ms reset timing - accepts switch closure or logic-low signal. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reset outputs | Simultaneous active-low (pin 1) and active-high (pin 7) RESET signals eliminate need for external inverters in mixed-logic systems. |
| Guaranteed reset at low VCC | RESET remains valid down to VCC = 1.1V - ensures deterministic behavior during deep brownout or backup-battery transition. |
| Integrated power-fail comparator | 1.25V precision reference with PFI/PFO pair enables flexible early-warning monitoring of non-5V rails without external components. |
| Debounced manual reset | 250μA internal MR pull-up and 200ms reset pulse width inherently suppress switch bounce - no RC network required. |
| Low quiescent current | 50μA typical supply current extends battery life in portable or always-on supervisory applications. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating in factory environments with fluctuating 5V supply rails. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET during power-up and brownout to prevent firmware execution errors and ensure deterministic boot sequence. Use Value: 4.65V reset threshold aligns with industrial-grade 5V regulator dropout limits, while 200ms pulse width satisfies IEC 61131-2 cold-start timing requirements. |
Use Scenario: Portable ultrasound imaging device with battery backup and dual-rail power management. IC Role / Device Role / Timing Role: Monitoring main +5V rail and generating early power-fail interrupt via PFO to trigger data save and graceful shutdown before battery depletion. Use Value: 1.25V PFI threshold enables accurate +12V rail monitoring using simple resistor divider, meeting FDA Class II device power-integrity mandates. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: CAN-connected body control unit exposed to automotive load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Providing robust reset assertion during VCC sag below 4.65V, with MR input tied to ignition-switch signal for key-on reset. Use Value: Guaranteed RESET validity down to VCC = 1.1V prevents latch-up during cranking (typically 6–9V drop to ~3.5V), ensuring post-crank recovery without external supervision. |
Use Scenario: Revenue-grade electricity meter with real-time clock and flash memory requiring fail-safe power-loss handling. IC Role / Device Role / Timing Role: Generating active-high RESET to initialize metrology SoC and asserting PFO interrupt to initiate EEPROM write-protection and RTC backup switching. Use Value: Dual-reset outputs interface natively with both SoC reset pin and external supervisor logic, eliminating level-shifting and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CUA+ | Same electrical specs but in 8-pin µMAX package (3mm × 3mm); higher thermal resistance and different PCB footprint. | Suitable for space-constrained designs where SO's 4.9mm × 6.0mm area is prohibitive; requires re-layout and thermal validation. | Select MAX707CUA+ only when board area is critical and thermal derating under 70°C ambient is confirmed. |
| MAX813LCSA+ | Identical pinout and 4.65V reset threshold, but includes watchdog timer (WDI/WDO) instead of N.C. pin; higher ISUPPLY (150μA typ). | Required when system-level watchdog functionality is needed; not drop-in if WDI/WDO pins are unused or conflict with existing routing. | Choose MAX813LCSA+ only if watchdog timeout is mandated; otherwise MAX707CSA+ offers lower power and simpler layout. |
Compared with MAX707CUA+, MAX707CSA+ provides identical supervision functionality with better thermal performance and standard SO footprint compatibility; compared with MAX813LCSA+, it trades watchdog capability for lower quiescent current and elimination of unused WDI/WDO routing complexity.
Availability
MAX707CSA+ 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 production lifecycles.
Supply support for MAX707CSA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications systems.
The MAX705–MAX708 family was designed specifically for cost-sensitive, space-constrained microprocessor systems needing integrated power-supply monitoring, reset generation, and power-fail warning - targeting embedded controllers and intelligent instrumentation.
FAQ
What is the reset threshold voltage for MAX707CSA+?
The MAX707CSA+ has a nominal reset threshold of 4.65V with ±150mV tolerance over temperature and supply variation. This value is guaranteed across the full 0°C to +70°C operating range and ensures reliable reset assertion when the +5V supply falls below regulation limits. The device also provides 40mV hysteresis to prevent chatter near the threshold. This specification is explicitly defined in the Electrical Characteristics table of the MAX707CSA+ datasheet.
Does MAX707CSA+ include a watchdog timer function?
No, the MAX707CSA+ does not include a watchdog timer. Unlike the MAX705/MAX706 series, the MAX707CSA+ substitutes the watchdog input (WDI) and watchdog output (WDO) pins with a no-connect (N.C.) and an active-high RESET output (pin 7). This configuration is confirmed in the Pin Description table and block diagrams of the MAX707CSA+ datasheet. Watchdog functionality is present only in MAX705/MAX706/MAX813L variants.
Can MAX707CSA+ operate with supply voltages below 5V?
Yes, the MAX707CSA+ operates from VCC = 1.1V to 5.5V and guarantees valid RESET output down to 1.1V. Its internal comparators and reset generator remain functional across this range, enabling use in battery-backed or low-power brownout scenarios. The 4.65V reset threshold is referenced internally and remains accurate regardless of VCC level above 1.1V, as verified in the Absolute Maximum Ratings and Electrical Characteristics sections.
What is the purpose of the PFI and PFO pins on MAX707CSA+?
The PFI (Power-Fail Input) pin accepts an external voltage for comparison against an internal 1.25V reference; when PFI falls below 1.25V, the PFO (Power-Fail Output) pin goes low. This pair enables early-warning detection of supply degradation - for example, monitoring a +12V rail via resistor divider on PFI to trigger PFO interrupt before the +5V rail collapses. The MAX707CSA+ datasheet confirms PFI threshold accuracy of ±50mV and PFO open-drain sink capability up to 3.2mA.
Is MAX707CSA+ pin-compatible with other devices in the MAX705–MAX708 family?
MAX707CSA+ shares the same 8-pin SO package and pinout with MAX705CSA+, MAX706CSA+, and MAX708CSA+, but differs electrically: pins 6 and 8 are N.C. and RESET (active-high) respectively, whereas MAX705/MAX706 use those pins for WDI and WDO. Therefore, it is physically pin-compatible but not functionally interchangeable without circuit review. The MAX707CSA+ datasheet explicitly states this substitution in the General Description and Pin Configurations sections.
MAX707CSA+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX707CSA+ FAQ
1.How can I place an order for MAX707CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX707CSA+ 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 MAX707CSA+ reliable?
The price and inventory of MAX707CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX707CSA+ is usually 5 days.
3.What payment methods are accepted for MAX707CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX707CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX707CSA+?
MAX707CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX707CSA+ 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 MAX707CSA+?
For technical support, including MAX707CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX707CSA+ requirements.
6.How does Aetrix verify that MAX707CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX707CSA+ 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 MAX707CSA+ meets industry standards.
7.What is the process for return or replacement of MAX707CSA+?
All MAX707CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX707CSA+, 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 MAX707CSA+ part is unused and in its original packaging.
Return procedure for MAX707CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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