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Analog Devices Inc./Maxim Integrated MAX708RCSA+
- Part No.:
- MAX708RCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708RCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:193
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Product details
Overview
MAX708RCSA+ from Maxim Integrated is a +3V microprocessor supervisory circuit providing active-low and active-high reset outputs, 2.63V precision supply-voltage monitoring, 200ms reset timeout, and power-fail warning via 1.25V comparator input - used in battery-powered portable instruments to ensure reliable µP startup and brownout recovery.
For engineers reviewing the MAX708RCSA+ datasheet, MAX708RCSA+ pinout, MAX708RCSA+ application, or MAX708RCSA+ equivalent, key selection criteria include dual-reset polarity support, guaranteed RESET assertion down to VCC = 1V, absence of watchdog timer (distinguishing it from MAX706 variants), SO-8 package compatibility, and operation across 0°C to +70°C industrial temperature range.
Technical Context
The MAX708RCSA+ integrates dual independent reset generators: one asserting active-low RESET and another active-high RESET, both synchronized to the same internal timing and threshold detection. It uses a precision bandgap reference for 2.63V ±1.5% reset threshold with 20mV hysteresis and guarantees valid output states down to VCC = 1V.
Its power-fail comparator features a fixed 1.25V internal reference with <±25nA input bias current, enabling accurate low-battery or unregulated supply monitoring via external resistive dividers. Unlike MAX706/706A series, MAX708RCSA+ omits watchdog functionality entirely, simplifying design where system-level supervision suffices without timeout-based fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% - precisely monitors +3V systems during power-up/down and brownout; triggers reset before µP enters undefined state. |
| Reset Pulse Width | 200ms typical - ensures sufficient hold time for full µP initialization and peripheral stabilization after VCC rise. |
| Supply Current | 100µA max at VCC = 3.6V - enables long battery life in portable equipment without compromising supervision reliability. |
| Operating Voltage Range | 1.2V to 5.5V - supports valid reset assertion even during deep brownout (down to 1V) and interoperability with +3.3V/+5V logic domains. |
| Power-Fail Input Threshold | 1.25V ±50mV - provides stable reference for external voltage divider to generate early-warning PFO signal prior to main supply dropout. |
| Output Drive Strength | 1.2mA sink / 500µA source at VCC < 3.6V - directly interfaces with standard CMOS/TTL µP reset inputs without external buffering. |
| Temperature Range | 0°C to +70°C - qualified for commercial and industrial embedded applications where extended thermal margin is not required. |
Pinout & Package
MAX708RCSA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount compatible with standard reflow profiles and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Debounced TTL/CMOS-compatible trigger; internally pulled up with 70µA current; initiates 200ms dual-reset pulse when pulled below 0.6V. |
| 2 VCC | Positive supply input | Accepts 1.2V–5.5V; powers all internal circuits and defines reset threshold reference; requires 0.1µF bypass capacitor to GND. |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance connection to minimize noise coupling into reset timing. |
| 4 PFI | Power-fail comparator input | High-impedance node referenced to 1.25V internal threshold; connects to external resistor divider for custom undervoltage detection. |
| 5 PFO | Active-low power-fail output | Open-drain output sinks current when PFI falls below 1.25V; used to interrupt µP or assert secondary reset via MR. |
| 6 N.C. | No connection | Not internally bonded; must remain unconnected on PCB to avoid parasitic coupling or ESD risk. |
| 7 RESET | Active-low reset output | Guaranteed logic-low when VCC < 2.63V or MR asserted; remains low for 200ms after recovery; drives standard µP reset pins. |
| 8 RESET | Active-high reset output | Complementary to RESET; guaranteed logic-high when VCC < 2.63V or MR asserted; eliminates need for external inverter in mixed-logic systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low RESET and active-high RESET eliminate external level-shifting or inversion logic in multi-vendor µP designs. |
| Precision 2.63V reset threshold | ±1.5% tolerance over temperature ensures consistent trip point across 0°C–+70°C, critical for reliable +3V system power sequencing. |
| Guaranteed reset assertion to VCC = 1V | Ensures µP remains held in reset during deep brownout conditions where other supervisors may release prematurely. |
| 1.25V power-fail comparator | Enables configurable early-warning detection of auxiliary supplies (e.g., battery, unregulated rails) with <25nA input leakage. |
| 200ms reset timeout | Internally generated delay meets JEDEC JESD84-B51 requirements for NAND flash boot stability and avoids race conditions in complex peripherals. |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by single Li-ion or alkaline cells experience voltage sag during high-current measurement bursts. IC Role / Device Role / Timing Role: MAX708RCSA+ continuously monitors VCC and asserts both RESET and RESET to halt µP execution until supply recovers above 2.63V. Use Value: Prevents corrupted memory writes and erratic I/O behavior during transient brownouts, extending field reliability without firmware intervention. |
Use Scenario: PLC modules operating from 24VDC supplies with local +3.3V regulation require fail-safe restart after power interruption. IC Role / Device Role / Timing Role: MAX708RCSA+ generates synchronized active-low and active-high reset pulses to initialize FPGA configuration logic and ARM Cortex-M core simultaneously. Use Value: Eliminates timing skew between subsystem resets, ensuring deterministic boot sequence and avoiding metastability in inter-subsystem handshakes. |
| Computers & Embedded Systems | Intelligent Sensors |
Use Scenario: Low-power edge computing nodes use +3.3V supplies derived from buck converters that may exhibit slow start-up or ripple-induced dips. IC Role / Device Role / Timing Role: MAX708RCSA+ monitors the regulated +3.3V rail and asserts RESET/RESET only after stable voltage is confirmed for ≥200ms. Use Value: Guarantees clean boot state for Linux-based SoCs and prevents kernel panic due to premature clock or memory initialization. |
Use Scenario: Wireless sensor nodes with integrated ADCs and RF transceivers require coordinated reset of analog front-end and digital baseband upon supply instability. IC Role / Device Role / Timing Role: MAX708RCSA+ uses PFI to monitor battery voltage via resistor divider and triggers PFO → MR to initiate controlled shutdown before cutoff. Use Value: Enables safe EEPROM logging of last valid sensor readings and preserves calibration data prior to complete power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA+ | Single active-low RESET output; includes 1.6s watchdog timer; identical 2.63V threshold and SO-8 package. | Required where software deadlock detection is needed; unsuitable if watchdog logic conflicts with system architecture. | Select MAX706RCSA+ only when watchdog supervision adds value; MAX708RCSA+ reduces BOM count where dual-reset polarity suffices. |
| TPS3808G12DBVR | 2.93V reset threshold; 200ms fixed delay; no dual-reset outputs; supports enable input and higher accuracy (±0.5%). | Better suited for +3.3V systems needing tighter threshold tolerance; lacks complementary reset signals for legacy µP interfaces. | Choose TPS3808G12DBVR for improved accuracy and enable control; retain MAX708RCSA+ when dual-polarity reset or Maxim ecosystem compatibility is mandatory. |
Compared with MAX706RCSA+, MAX708RCSA+ removes watchdog complexity while adding active-high reset - simplifying firmware and enabling direct interface with µPs requiring high-true reset. Against TPS3808G12DBVR, it trades threshold accuracy for dual-output flexibility and broader VCC operating range (1.2V–5.5V vs. 2.7V–6.8V).
Availability
MAX708RCSA+ is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, computers, and intelligent sensors requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX708RCSA+ 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 power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX708 family delivers cost-effective, highly integrated µP supervisory functions targeting +3V systems - emphasizing dual-reset capability, low quiescent current, and robust brownout immunity for portable and embedded platforms.
FAQ
What is the reset threshold voltage of the MAX708RCSA+?
The MAX708RCSA+ has a precision reset threshold of 2.63V ±1.5%, specified over the full 0°C to +70°C temperature range. This value is factory-trimmed and applies to both RESET and RESET outputs. The threshold remains stable across VCC from 1.2V to 5.5V, ensuring reliable operation during brownout conditions where supply voltage drops near the trip point.
Does the MAX708RCSA+ include a watchdog timer function?
No, the MAX708RCSA+ does not include a watchdog timer. It is explicitly differentiated from the MAX706/706A series by omission of the WDI and WDO pins and associated timing circuitry. The MAX708RCSA+ focuses solely on voltage monitoring and dual-reset generation, making it suitable for systems where software-level supervision is handled externally or unnecessary.
How do the RESET and RESET outputs behave during power-up?
On power-up, MAX708RCSA+ guarantees RESET is logic-low and RESET is logic-high when VCC reaches 1V. Both outputs remain asserted until VCC exceeds 2.63V, then deassert after a fixed 200ms delay. This ensures µP reset is held long enough for internal clocks and memories to stabilize, regardless of supply ramp rate or noise.
Can the MAX708RCSA+ monitor a power supply other than VCC?
Yes, the MAX708RCSA+ includes a dedicated PFI (Power-Fail Input) pin referenced to an internal 1.25V comparator. By connecting PFI to a resistive divider from an auxiliary supply (e.g., battery, unregulated DC), the device generates a PFO (Power-Fail Output) signal when that supply falls below the calculated threshold - enabling early-warning shutdown or data save operations.
What package type and lead finish does the MAX708RCSA+ use?
The MAX708RCSA+ is supplied in an 8-pin SO (Small Outline) package (S8-2 footprint) with lead-free (RoHS-compliant) terminations. It is compatible with standard surface-mount assembly processes and IPC-7351B land pattern recommendations. The package supports reflow soldering per JEDEC J-STD-020 and operates reliably across the full 0°C to +70°C ambient temperature range.
MAX708RCSA+ 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:
- 2.63V
- 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
MAX708RCSA+ FAQ
1.How can I place an order for MAX708RCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708RCSA+ 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 MAX708RCSA+ reliable?
The price and inventory of MAX708RCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708RCSA+ is usually 5 days.
3.What payment methods are accepted for MAX708RCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708RCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708RCSA+?
MAX708RCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708RCSA+ 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 MAX708RCSA+?
For technical support, including MAX708RCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708RCSA+ requirements.
6.How does Aetrix verify that MAX708RCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX708RCSA+ 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 MAX708RCSA+ meets industry standards.
7.What is the process for return or replacement of MAX708RCSA+?
All MAX708RCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708RCSA+, 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 MAX708RCSA+ part is unused and in its original packaging.
Return procedure for MAX708RCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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