My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX708RESA+
- Part No.:
- MAX708RESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708RESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:227
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX708RESA+ from Maxim Integrated is a precision +3V microprocessor supervisory circuit with dual active-high and active-low reset outputs, 2.93V reset threshold, 200ms reset pulse width, and integrated power-fail comparator (1.25V reference). It monitors VCC in battery-powered embedded systems to ensure reliable µP startup, brownout recovery, and orderly shutdown.
For engineers reviewing the MAX708RESA+ datasheet, MAX708RESA+ pinout, MAX708RESA+ application, or MAX708RESA+ equivalent, this page delivers verified functional identity, package mapping, real-world timing behavior, reset assertion guarantees down to VCC = 1V, and validated alternative options for industrial and portable instrumentation designs.
Technical Context
The MAX708RESA+ implements a dual-reset architecture with independent RESET (active-high) and RESET (active-low) outputs, both asserted during power-up, brownout, or manual reset events. Its internal timer guarantees 200ms minimum reset pulse width after VCC exceeds the 2.93V threshold or MR deassertion.
A dedicated 1.25V precision comparator monitors external supply rails via PFI and drives the open-drain PFO output for power-fail warning or low-battery detection. Unlike MAX706 variants, MAX708RESA+ excludes watchdog functionality, eliminating WDI/WDO pins and simplifying timing-critical applications requiring deterministic reset behavior without supervision overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reset assertion before 3.3V µP logic fails |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and peripheral stabilization |
| Supply Voltage Range | 1.2V to 5.5V; supports operation down to VCC = 1V with guaranteed RESET assertion |
| Quiescent Current | 100µA max at TA = +85°C; enables multi-year battery life in portable instruments |
| Power-Fail Threshold | 1.25V ±5% internal reference; allows accurate monitoring of auxiliary supplies via resistive divider |
| Manual Reset Input | TTL/CMOS-compatible; 500ns min pulse width at VCC = 3V; debounced by internal timing |
| Output Drive Strength | RESET: 500µA source / 1.2mA sink at VCC < 3.6V; compatible with standard µP reset inputs |
Pinout & Package
MAX708RESA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compliant, with 1.27mm pitch and JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-Low Manual Reset Input | Pull below 0.6V to trigger 200ms reset pulse; internally pulled up with 70µA current |
| 2 VCC | Positive Supply Input | Accepts 1.2V–5.5V; RESET/RESET asserted when VCC < 2.93V or during brownout |
| 3 GND | Ground Reference | Return path for all internal circuits and output sinks |
| 4 PFI | Power-Fail Comparator Input | Connect to resistive divider; comparator trips when PFI < 1.25V |
| 5 PFO | Active-Low Power-Fail Output | Open-drain output; sinks current when PFI < 1.25V for µP interrupt or shutdown signaling |
| 6 RESET | Active-High Reset Output | Push-pull output; remains high during reset condition and for 200ms after recovery |
| 7 RESET | Active-Low Reset Output | Push-pull output; remains low during reset condition and for 200ms after recovery |
| 8 NC | No Connection | Not internally bonded; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Guaranteed Reset Assertion to VCC = 1V | Ensures µP remains held in reset even during deep brownout or battery depletion scenarios |
| 1.25V Precision Power-Fail Comparator | Enables early-warning detection of unregulated rail collapse or battery voltage sag without external reference |
| 200ms Internally Timed Reset Delay | Eliminates need for external RC timing components, reducing BOM count and layout area |
| Debounced Manual Reset Input | Accepts mechanical switch inputs directly; 140ms minimum pulse width prevents contact bounce false triggers |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Dual-Logic µPs |
|---|---|
Use Scenario: Handheld multimeter powered by 3.7V Li-ion battery with AC adapter backup. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers reset if battery drops below 3.0V or adapter disconnects. Use Value: Prevents corrupted EEPROM writes during brownout using guaranteed RESET assertion down to VCC = 1V. |
Use Scenario: PLC I/O module containing both 3.3V ARM MCU and 5V FPGA logic. IC Role / Device Role / Timing Role: Generates synchronized active-high reset for MCU and active-low reset for FPGA from single VCC monitor. Use Value: Eliminates separate reset ICs or level-shifting circuitry, reducing component count and timing skew. |
| Medical Diagnostic Handhelds | Smart Energy Meters with Backup Supercap |
Use Scenario: Ultrasound probe with real-time DSP and flash memory storage. IC Role / Device Role / Timing Role: Monitors 3.3V supply and asserts reset on power-up/brownout; uses PFO to signal low-battery condition to host. Use Value: Enables safe data flush and shutdown sequence before power loss, preserving diagnostic integrity. |
Use Scenario: Electricity meter with supercapacitor backup maintaining RTC and RAM during mains outage. IC Role / Device Role / Timing Role: Detects main 3.3V rail collapse via PFI and asserts RESET to initiate backup switchover within 200ms. Use Value: Guarantees uninterrupted timekeeping and volatile memory retention through seamless power transition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708SCSA+ | Same 8-pin SO package, identical pinout, but rated for 0°C to +70°C industrial range (vs. -40°C to +85°C) | Limited to commercial-temperature environments; unsuitable for extended outdoor or automotive under-hood use | Select MAX708SCSA+ only for cost-sensitive, non-extended-temperature applications where full industrial grade is unnecessary |
| TPS3808G33DBVR | Single active-low reset output, 3.3V threshold, 200ms delay, 2.5µA quiescent current; no dual-reset or PFO capability | Lacks power-fail warning and dual-output flexibility; requires external circuitry for active-high reset generation | Choose TPS3808G33DBVR only when ultra-low power dominates design priorities and PFO/dual-reset functions are omitted |
Compared with MAX708RESA+, MAX708SCSA+ offers identical functionality at lower temperature grade, while TPS3808G33DBVR trades dual-reset and PFO capability for significantly lower quiescent current-making it suitable only when those features are excluded from the system architecture.
Availability
MAX708RESA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX708RESA+ 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 demanding industrial, medical, and communications applications.
The MAX708 family delivers low-cost, highly integrated µP supervisory circuits optimized for +3V/+3.3V systems where reliability, small footprint, and deterministic reset timing are critical.
FAQ
What is the reset threshold voltage for MAX708RESA+?
The MAX708RESA+ has a fixed reset threshold of 2.93V (VCC falling), with 20mV hysteresis. This value is factory-trimmed and guaranteed over the full -40°C to +85°C operating range. The threshold ensures reliable reset assertion before 3.3V µP I/O or core logic becomes unstable, and is confirmed in the Electrical Characteristics table of the MAX708R/S/T datasheet. MAX708RESA+ belongs to the 'S' variant group, matching MAX708SCSA+ and MAX708SESA+ in threshold specification.
Does MAX708RESA+ include a watchdog timer function?
No, MAX708RESA+ does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family replaces the WDI and WDO pins with dual reset outputs (RESET and RESET). The datasheet explicitly states that MAX708R/S/T devices "provide the same functions as the MAX706R/S/T [...] except they do not have a watchdog timer." This makes MAX708RESA+ ideal for applications requiring deterministic reset behavior without supervision timing dependencies.
What is the purpose of the PFO pin on MAX708RESA+?
The PFO (Power-Fail Output) pin on MAX708RESA+ is an active-low, open-drain output driven by an internal 1.25V comparator monitoring the PFI input. When PFI falls below 1.25V-typically set via a resistive divider on an unregulated rail-PFO pulls low to signal impending power loss. This allows the µP to execute an orderly shutdown, save state, or trigger backup power switchover. PFO is electrically isolated from the reset generator, enabling independent use for battery monitoring or auxiliary supply supervision.
Can MAX708RESA+ operate with a 1.8V supply?
No, MAX708RESA+ cannot operate reliably with a 1.8V supply. Its absolute minimum supply voltage is 1.2V, but the reset threshold (2.93V) and internal comparator references require VCC ≥ 2.93V to assert reset correctly. The Electrical Characteristics table specifies valid operating conditions only for VCC ≥ 2.93V (for 'S' variants), and functional operation below that violates the device's design intent. For 1.8V systems, consider dedicated low-voltage supervisors such as MAX6369 or TPS3801.
Is MAX708RESA+ pin-compatible with MAX706RESA+?
No, MAX708RESA+ is not pin-compatible with MAX706RESA+. While both are 8-pin SO packages, MAX706RESA+ uses pins 6 and 8 for RESET (active-low) and WDO (watchdog output), whereas MAX708RESA+ uses pins 6 and 7 for RESET (active-high) and RESET (active-low), with pin 8 designated NC. The Pin Configurations section of the datasheet confirms distinct pin mappings. Substituting one for the other without board revision will result in incorrect or nonfunctional reset signaling.
MAX708RESA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX708RESA+ FAQ
1.How can I place an order for MAX708RESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708RESA+ 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+ reliable?
The price and inventory of MAX708RESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708RESA+ is usually 5 days.
3.What payment methods are accepted for MAX708RESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708RESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708RESA+?
MAX708RESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708RESA+ 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+?
For technical support, including MAX708RESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708RESA+ requirements.
6.How does Aetrix verify that MAX708RESA+ is sourced from the original manufacturer or authorized distributors?
All MAX708RESA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX708RESA+?
All MAX708RESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708RESA+, 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+ part is unused and in its original packaging.
Return procedure for MAX708RESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX708RESA+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
