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Analog Devices Inc./Maxim Integrated MAX708RESA+T
- Part No.:
- MAX708RESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708RESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,102
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Product details
Overview
MAX708RESA+T 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 threshold comparator - used in battery-powered portable instruments to ensure reliable µP startup and brownout recovery.
For engineers reviewing the MAX708RESA+T datasheet, MAX708RESA+T pinout, MAX708RESA+T application, or MAX708RESA+T equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), guaranteed RESET assertion down to VCC = 1V, dual-reset output polarity support, and SO-8 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The MAX708RESA+T implements a precision bandgap-based voltage monitor with 20mV hysteresis and a dedicated 1.25V reference for PFI comparison. Its reset generator uses an internal RC timing circuit to guarantee 200ms minimum reset pulse width after VCC exceeds the 2.93V threshold.
Unlike MAX706 variants, the MAX708RESA+T omits the watchdog timer but integrates both RESET (active-low) and RESET (active-high) outputs on separate pins, enabling direct interface with µPs requiring either polarity without external inverters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - precisely monitors +3.3V systems during power-up/down and brownout |
| Reset Pulse Width | 200ms minimum - ensures µP initialization completes before release from reset |
| Supply Voltage Range | 1.2V to 5.5V - guarantees valid reset assertion even as VCC drops to 1V |
| Quiescent Current | 100µA max at VCC = 3.3V - enables long battery life in portable equipment |
| PFI Threshold | 1.25V ±10mV - supports accurate power-fail or low-battery warning via external resistor divider |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded and automotive-adjacent applications |
| Package | 8-pin SO (S8-2) - surface-mount compatible with standard reflow profiles |
Pinout & Package
MAX708RESA+T is housed in an 8-pin SOIC (S8-2) package, 3.9mm × 4.9mm body, 1.27mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA current; debounced by ≥200ms reset timeout |
| 2 VCC | Positive supply input | Accepts 1.2V–5.5V; powers all internal comparators, timers, and outputs |
| 3 GND | Ground reference | Return path for all internal circuits and output sinks |
| 4 PFI | Power-fail comparator input | Compares external voltage against internal 1.25V reference; open-drain PFO asserts when PFI < 1.25V |
| 5 PFO | Active-low power-fail output | Open-drain output; sinks current when PFI falls below 1.25V; used for early-warning interrupt |
| 6 RESET | Active-low reset output | Guaranteed logic-low when VCC < 2.93V or MR asserted; remains low for ≥200ms after recovery |
| 7 RESET | Active-high reset output | Complementary to RESET; guaranteed logic-high when VCC < 2.93V or MR asserted |
| 8 NC | No connection | Not internally bonded; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate need for external inverters in mixed-logic systems |
| Guaranteed reset at low VCC | RESET and RESET remain valid down to VCC = 1V - critical for graceful shutdown in collapsing supply rails |
| Low-power operation | 100µA max quiescent current at 3.3V enables >10-year battery life in coin-cell–powered devices |
| High-accuracy voltage monitoring | 2.93V reset threshold with ±1.5% tolerance over –40°C to +85°C ensures consistent behavior across environments |
| Configurable power-fail detection | 1.25V PFI reference with 10mV hysteresis allows precise early-warning setup for unregulated supplies or battery voltage decay |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered ECG and SpO₂ monitors operating from single Li-ion or alkaline cells with variable discharge curves. IC Role / Device Role / Timing Role: Supervisory circuit ensuring µP reset integrity during battery voltage sag, charger insertion, or cold-start conditions. Use Value: Dual RESET/RESET outputs directly drive both microcontroller reset and FPGA configuration logic without level-shifting or inversion. |
Use Scenario: DIN-rail mounted programmable logic controller modules exposed to wide ambient temperature swings and noisy 24V DC field power. IC Role / Device Role / Timing Role: Primary voltage supervisor validating 3.3V logic rail stability and generating fail-safe reset during brownouts. Use Value: 200ms reset pulse width exceeds typical µP minimum requirements, preventing premature code execution after power recovery. |
| Smart Energy Meters | Ruggedized Handheld Test Equipment |
|
Use Scenario: ANSI C12.20-compliant electricity meters with backup supercapacitors and dual-supply domains (3.3V logic, 5V analog). IC Role / Device Role / Timing Role: Monitoring main 3.3V rail while using PFI to detect backup capacitor depletion via resistive divider. Use Value: 1.25V PFI reference enables accurate end-of-capacity warning with <1% error, triggering data save before power loss. |
Use Scenario: Field-deployable oscilloscopes and multimeters powered by hot-swappable LiPo packs with dynamic load transients. IC Role / Device Role / Timing Role: Ensuring deterministic µP reset during battery swap, USB power negotiation, or ESD-induced supply glitches. Use Value: Guaranteed RESET assertion to VCC = 1V prevents latch-up or undefined state in ARM Cortex-M cores during rapid rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708TESA+ | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, features, and SO-8 package | Suitable for +3.3V systems with tighter upper supply margin or higher noise immunity requirement | Select MAX708TESA+ when system VCC nominal is 3.3V ±3% and brownout must trigger above 3.0V |
| TPS3808G33DBVR | Single active-low reset output; 3.08V threshold; 350ms default delay (adjustable); 2.5µA quiescent current | Lacks dual-reset outputs and PFI/PFO functionality; optimized for ultra-low-power always-on monitoring | Choose TPS3808G33DBVR only if dual-reset polarity and power-fail warning are unnecessary and sub-µA supply current is mandatory |
Compared with MAX708TESA+, MAX708RESA+T provides earlier brownout detection in +3.3V systems; compared with TPS3808G33DBVR, it delivers full supervisory feature set-including dual-reset outputs and PFI-based early warning-at higher quiescent current but broader functional coverage.
Availability
MAX708RESA+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and ruggedized handheld test equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MAX708RESA+T 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 high-performance analog and mixed-signal ICs for industrial, communications, computing, and consumer applications.
The MAX708R/S/T product line delivers cost-optimized, precision µP supervisory circuits targeting battery-powered and industrial systems where reliability under voltage stress is critical.
FAQ
What is the reset threshold voltage of the MAX708RESA+T?
The MAX708RESA+T has a factory-trimmed reset threshold of 2.93V ±1.5% over the full –40°C to +85°C temperature range. This value is specified for VCC falling conditions and includes 20mV hysteresis to prevent chatter near the trip point. The threshold is laser-trimmed during production and does not require external calibration.
Does the MAX708RESA+T include a watchdog timer function?
No, the MAX708RESA+T does not include a watchdog timer. It is functionally distinct from the MAX706 series: the MAX708 family replaces the WDI/WDO pins with dual RESET/RESET outputs. Watchdog capability is present only in MAX706P/R/S/T and MAX706AP/AR/AS/AT variants.
Can the MAX708RESA+T operate with a 1.8V supply?
No, the MAX708RESA+T requires a minimum VCC of 1.2V to assert reset, but its reset threshold (2.93V) and internal reference circuitry are designed for +3V/+3.3V systems. Operation below 2.7V may result in undefined PFI comparator behavior and reduced output drive strength; it is not characterized or guaranteed for 1.8V operation.
How is the power-fail warning implemented in the MAX708RESA+T?
The MAX708RESA+T implements power-fail warning using the PFI input and PFO output. PFI compares an external voltage (e.g., from a resistive divider on an unregulated rail) against an internal 1.25V reference. When PFI falls below 1.25V, PFO goes low, signaling impending supply failure. PFO is open-drain and requires an external pullup.
What is the meaning of the 'R', 'S', and 'T' suffixes in the MAX708 family?
In the MAX708 family, the suffix denotes the reset threshold voltage: 'R' = 2.63V, 'S' = 2.93V (as in MAX708RESA+T), and 'T' = 3.08V. All share identical pinout, package, temperature range, and feature set - only the voltage monitor threshold differs. The 'E' indicates –40°C to +85°C industrial temperature grade.
MAX708RESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX708RESA+T FAQ
1.How can I place an order for MAX708RESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708RESA+T 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 MAX708RESA+T reliable?
The price and inventory of MAX708RESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708RESA+T is usually 5 days.
3.What payment methods are accepted for MAX708RESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708RESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708RESA+T?
MAX708RESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708RESA+T 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 MAX708RESA+T?
For technical support, including MAX708RESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708RESA+T requirements.
6.How does Aetrix verify that MAX708RESA+T is sourced from the original manufacturer or authorized distributors?
All MAX708RESA+T 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 MAX708RESA+T meets industry standards.
7.What is the process for return or replacement of MAX708RESA+T?
All MAX708RESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708RESA+T, 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 MAX708RESA+T part is unused and in its original packaging.
Return procedure for MAX708RESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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