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Analog Devices Inc./Maxim Integrated MAX708SCSA+
- Part No.:
- MAX708SCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708SCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:868
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Product details
Overview
MAX708SCSA+ from Maxim Integrated is a +3V microprocessor supervisory circuit providing dual active-high and active-low reset outputs, 2.93V precision supply-voltage monitoring, 200ms reset pulse width, and power-fail warning via 1.25V PFI comparator - used in battery-powered portable instruments and embedded controllers requiring reliable power-up/down sequencing.
For engineers reviewing the MAX708SCSA+ datasheet, MAX708SCSA+ pinout, MAX708SCSA+ application, or MAX708SCSA+ equivalent, key selection considerations include its dual-reset output capability, absence of watchdog timer (distinguishing it from MAX706 series), SO-8 package compatibility, and guaranteed RESET assertion down to VCC = 1V for robust brownout recovery.
Technical Context
The MAX708SCSA+ implements a precision bandgap-based voltage monitor with 20mV hysteresis and a dedicated 1.25V reference for the PFI comparator. Its reset generator asserts both RESET (active-high) and RESET (active-low) simultaneously when VCC falls below 2.93V or MR is pulled low, maintaining assertion for ≥200ms after recovery.
No internal watchdog timer is present - unlike MAX706 variants - eliminating WDI/WDO pins and simplifying design for systems requiring only voltage supervision and manual reset. The device operates across VCC = 1.2V to 5.5V and guarantees functional reset behavior down to VCC = 1V, enabling use in deep brownout scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reliable reset assertion before µP supply dropout in +3V systems |
| Reset Pulse Width | 200ms minimum; provides sufficient time for µP initialization and peripheral stabilization |
| Supply Current | 100µA typical at VCC = 3.3V; enables long battery life in portable equipment |
| PFI Threshold | 1.25V ±50mV; supports accurate power-fail or low-battery detection with external resistor divider |
| Operating Voltage Range | 1.2V to 5.5V; allows operation during severe brownout and compatibility with +3V/+5V systems |
| Reset Output Drive | RESET sinks 1.2mA @ 0.3V; RESET sources 500µA @ 0.8×VCC; supports direct interface to TTL/CMOS inputs |
| Guaranteed Reset Assertion | Down to VCC = 1V; prevents undefined µP state during gradual power collapse |
Pinout & Package
MAX708SCSA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount compatible, with standard 1.27mm pitch and JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Debounced TTL/CMOS-compatible input; 70µA internal pullup; triggers both reset outputs when pulled <0.6V |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; powers all internal circuits and defines reset threshold reference |
| 3 (GND) | Ground reference | Return path for all internal current sources and comparator references |
| 4 (PFI) | Power-fail comparator input | High-impedance (±25nA) input referenced to internal 1.25V; used for external supply monitoring |
| 5 (PFO) | Active-low power-fail output | Open-drain output asserting low when PFI <1.25V; drives µP interrupt or MR for cascaded reset |
| 6 (N.C.) | No connection | Not internally bonded; must remain unconnected per datasheet |
| 7 (RESET) | Active-low reset output | Asserted low during power-up/brownout/manual reset; held low ≥200ms after recovery |
| 8 (RESET) | Active-high reset output | Complementary to RESET; asserted high during fault conditions; deasserts synchronously |
Key Features
| Feature | Design Value |
|---|---|
| Dual active-high and active-low reset outputs | Eliminates need for external inverters or level translators in mixed-logic systems |
| 2.93V precision reset threshold with 20mV hysteresis | Ensures clean, bounce-free reset assertion/deassertion in noisy +3V environments |
| 1.25V PFI comparator with ±25nA input bias | Enables accurate, low-power power-fail or battery-low detection using high-value resistive dividers |
| 200ms factory-trimmed reset timeout | Guarantees µP core and peripherals fully stabilize before release from reset |
| Operation down to VCC = 1.2V | Supports fail-safe reset assertion even during deep brownout or battery depletion |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by single Li-ion or alkaline cells. IC Role / Device Role / Timing Role: Supervises main +3.3V rail and monitors battery voltage via PFI to trigger graceful shutdown before cutoff. Use Value: Dual RESET/RESET outputs directly interface to µP and display controller without logic translation; 100µA quiescent current extends runtime. |
Use Scenario: PLC I/O modules operating in variable industrial power environments with ripple and transient risk. IC Role / Device Role / Timing Role: Provides deterministic reset during AC line sags and ensures µP restarts only after stable +3.3V is restored. Use Value: Guaranteed reset assertion to VCC = 1V prevents erratic behavior during slow power collapse; 20mV hysteresis rejects supply noise. |
| Computers & Embedded Systems | Critical µP Power Monitoring |
Use Scenario: Low-power edge computing nodes using +3.3V SoCs with backup coin-cell support. IC Role / Device Role / Timing Role: Monitors primary supply and asserts both reset polarities to coordinate SoC and PMIC sequencing. Use Value: Simultaneous active-high and active-low outputs eliminate external inverters, reducing BOM count and layout area in space-constrained designs. |
Use Scenario: Medical diagnostic devices where µP reset integrity is safety-critical per IEC 62304. IC Role / Device Role / Timing Role: Primary hardware reset supervisor with traceable timing (200ms ±15%) and failure-mode analysis support. Use Value: Factory-trimmed reset threshold (±1.5%) and guaranteed VCC = 1V operation provide documented margin for worst-case brownout validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708RCSA+ | 2.63V reset threshold (vs. 2.93V); identical pinout, package, and dual-reset functionality | Suitable for systems with lower VCC tolerance or tighter supply margins | Select when main supply nominal is 2.85V or lower; verify µP reset hold time compatibility |
| MAX708TCSA+ | 3.08V reset threshold (vs. 2.93V); same SO-8 package and dual-output architecture | Preferred for +3.3V systems with higher noise immunity requirements or wider supply tolerances | Choose for 3.3V rails with >±5% variation; ensures reset asserts before µP VCC min spec violation |
Compared with MAX708RCSA+ and MAX708TCSA+, the MAX708SCSA+ offers the optimal 2.93V threshold for standard +3.3V supplies, balancing early fault detection against false triggering from transient dips - critical for portable instrumentation where supply stability varies with load and battery state.
Availability
MAX708SCSA+ is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, and embedded computing applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free SO-8 packaging.
Supply support for MAX708SCSA+ 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, automotive, and communications markets.
The MAX708 family was designed specifically for cost-sensitive, space-constrained microprocessor systems needing reliable, low-quiescent-current power supervision - with emphasis on portable, battery-operated, and industrial control applications.
FAQ
What is the reset threshold voltage of the MAX708SCSA+?
The MAX708SCSA+ has a factory-trimmed reset threshold of 2.93V (VCC falling), with ±1.5% accuracy over temperature. This value is specified for the 'S' variant in the MAX708R/S/T series and ensures reliable reset assertion before most +3.3V microprocessors drop out of specification. The MAX708SCSA+ also includes 20mV hysteresis to prevent chatter near the trip point.
Does the MAX708SCSA+ include a watchdog timer function?
No, the MAX708SCSA+ does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family omits WDI and WDO pins entirely. The MAX708SCSA+ provides only voltage supervision, manual reset, and power-fail monitoring - making it simpler and more deterministic for applications where software-level watchdog oversight is handled externally or not required.
What are the functions of the PFI and PFO pins on the MAX708SCSA+?
On the MAX708SCSA+, PFI is the high-impedance input to a comparator referenced to an internal 1.25V bandgap. When PFI voltage falls below 1.25V, PFO (an open-drain output) pulls low. This enables flexible power-fail warning, low-battery detection, or secondary supply monitoring using an external resistor divider - without consuming additional supply current beyond ±25nA.
Can the MAX708SCSA+ operate with a supply voltage below 3V?
Yes, the MAX708SCSA+ operates from VCC = 1.2V to 5.5V and guarantees RESET assertion down to VCC = 1V. At 1.2V, it maintains full supervisory functionality including 2.93V threshold comparison (relative to VCC), 200ms reset timing, and PFI/PFO operation - enabling use in deeply browned-out states or ultra-low-power sleep modes where supply collapses gradually.
What is the purpose of the N.C. pin on the MAX708SCSA+?
Pin 6 of the MAX708SCSA+ is marked N.C. (No Connection) in the datasheet and is not internally bonded. It must remain unconnected on the PCB - neither tied to VCC, GND, nor left floating with parasitic coupling. Connecting this pin may cause unpredictable behavior or damage, as it has no internal circuitry and is excluded from ESD protection structures.
MAX708SCSA+ 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:
- 2.93V
- 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
MAX708SCSA+ FAQ
1.How can I place an order for MAX708SCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SCSA+ 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 MAX708SCSA+ reliable?
The price and inventory of MAX708SCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SCSA+ is usually 5 days.
3.What payment methods are accepted for MAX708SCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SCSA+?
MAX708SCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SCSA+ 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 MAX708SCSA+?
For technical support, including MAX708SCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SCSA+ requirements.
6.How does Aetrix verify that MAX708SCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX708SCSA+ 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 MAX708SCSA+ meets industry standards.
7.What is the process for return or replacement of MAX708SCSA+?
All MAX708SCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SCSA+, 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 MAX708SCSA+ part is unused and in its original packaging.
Return procedure for MAX708SCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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