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Analog Devices Inc./Maxim Integrated MAX708ESA+T
- Part No.:
- MAX708ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708ESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,152
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Product details
Overview
MAX708ESA+T from Maxim Integrated is an industrial-grade microprocessor supervisory circuit providing active-high reset output, 4.40V supply-voltage monitoring, watchdog timer disable (replaced by active-high RESET), power-fail warning via PFI/PFO comparator, and debounced manual-reset input - all in an 8-pin SO package. It ensures reliable μP startup and brownout recovery in embedded controllers and intelligent instrumentation.
For engineers reviewing the MAX708ESA+T datasheet, MAX708ESA+T pinout, MAX708ESA+T application, or MAX708ESA+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - supporting rapid selection for critical power-monitoring designs requiring -40°C to +85°C operation and lead-free compliance.
Technical Context
The MAX708ESA+T implements a precision voltage monitor with 4.40V ±150mV threshold and 40mV hysteresis, guaranteeing reset assertion during brownout while preventing chatter. Its internal 250μA MR pull-up enables direct pushbutton interfacing without external components.
Unlike the MAX705/MAX706, the MAX708 replaces the watchdog output (WDO) with a second reset output (RESET), delivering complementary active-low and active-high reset signals synchronized to VCC transitions and MR events - eliminating need for external inverters in dual-reset architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset when +5V rail drops below safe logic level; hysteresis prevents oscillation near threshold |
| Reset Pulse Width | 200ms nominal - ensures μP completes full initialization before release; minimum 140ms guaranteed |
| Supply Voltage Range | 1.2V to 5.5V - supports valid RESET assertion down to 1.2V VCC, enabling low-voltage brownout detection |
| MR Input Threshold | 0.8V (low), 2.0V (high) - TTL/CMOS-compatible; internal 250μA pull-up allows switch-to-ground operation |
| PFI Comparator Threshold | 1.25V ±50mV - monitors auxiliary supplies (e.g., +12V via divider) or battery voltage for early power-fail warning |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments; no derating required across full range |
| Package | 8-pin SO (Small Outline) - RoHS-compliant, surface-mountable, footprint compatible with industry-standard 150mil SOIC |
Pinout & Package
MAX708ESA+T is housed in an 8-pin SO (Small Outline) package, 150mil width, RoHS-compliant with lead-free terminations (+ suffix). Pin 1 is marked with a beveled corner or dot; device orientation follows JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible input; internal 250μA pull-up enables direct pushbutton grounding; 150ns minimum pulse width accepted |
| 2 VCC | +5V Supply Input | Main power rail connection; operates from 1.2V–5.5V; RESET remains valid down to 1.2V VCC |
| 3 GND | Ground Reference | 0V reference for all analog and digital functions; must be low-impedance connection to system ground plane |
| 4 PFI | Power-Fail Input | Comparator inverting input referenced to 1.25V; connects to voltage divider for monitoring non-5V rails or batteries |
| 5 PFO | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V; used to trigger NMI or initiate controlled shutdown |
| 6 RESET | Active-High Reset Output | Complementary to RESET; drives high when VCC > 4.40V and no reset condition active; valid to VCC = 1.2V |
| 7 RESET | Active-Low Reset Output | Guaranteed logic low (≤0.4V) during reset; pulses low for 200ms on power-up/brownout; stays low until VCC > 4.40V + hysteresis |
| 8 WDO | No Connect (N.C.) | Not bonded internally in MAX708; pin left unconnected per datasheet - no external tie required |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at Low VCC | RESET and RESET outputs remain functional down to VCC = 1.2V - enables brownout detection before complete power collapse |
| Dual Complementary Reset Outputs | Simultaneous active-low RESET and active-high RESET eliminate need for external inverters in systems requiring both signal polarities |
| Integrated Power-Fail Comparator | 1.25V precision reference with nanoscale input bias current (<25nA) enables accurate monitoring of auxiliary supplies without loading |
| Debounced Manual-Reset Interface | Internal 250μA pull-up and 140ms minimum reset pulse width provide hardware-level switch debouncing - no RC network needed |
| Industrial Temperature Range | Qualified from -40°C to +85°C with full electrical performance guaranteed - suitable for factory automation and outdoor equipment |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Programmable logic controllers operating in factory-floor environments with fluctuating 24VDC supplies converted to +5V. IC Role / Device Role / Timing Role: Supervises +5V rail integrity, asserts dual-polarity reset on brownout, and monitors backup battery voltage via PFI divider. Use Value: Prevents spurious PLC state changes during line sags; 200ms reset pulse ensures firmware reload completion before I/O initialization. |
Use Scenario: Portable ultrasound units powered by Li-ion batteries with regulated +5V and +12V rails. IC Role / Device Role / Timing Role: Detects battery depletion via PFI-connected divider; generates coordinated RESET/RESET to halt data acquisition before voltage collapse. Use Value: Enables graceful shutdown and image save prior to power loss; 1.25V PFI threshold allows precise end-of-charge detection. |
| Smart Energy Meters | Ruggedized Network Routers |
Use Scenario: DIN-rail mounted electricity meters exposed to wide ambient temperature swings and conducted EMI. IC Role / Device Role / Timing Role: Monitors isolated +5V DC-DC output; uses MR for tamper-triggered reset; leverages PFO to flag AC mains failure. Use Value: Ensures meter firmware restarts cleanly after grid interruption; -40°C to +85°C rating guarantees operation in unheated enclosures. |
Use Scenario: Carrier-grade routers with redundant power inputs and hot-swap modules. IC Role / Device Role / Timing Role: Provides primary reset supervision for main CPU; PFI monitors standby +3.3V rail; RESET coordinates FPGA configuration sequencing. Use Value: Dual reset outputs simplify timing-critical boot order between CPU and programmable logic; SO package supports automated reflow assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707ESA+T | Same 4.40V reset threshold, identical SO-8 package, but includes WDO instead of N.C. pin; RESET output not present | Requires external inverter if active-high reset needed; better suited for watchdog-dependent systems | Select MAX707ESA+T only if watchdog timeout functionality is required and active-high reset is generated externally |
| MAX813LESA+T | 4.65V reset threshold (not 4.40V); includes watchdog timer and WDO; no RESET output; same SO-8 package and -40°C to +85°C rating | Designed for +5V systems where higher reset threshold prevents nuisance resets; lacks dual-reset capability | Choose MAX813LESA+T for standard +5V applications needing watchdog oversight but not complementary reset signals |
Compared with MAX707ESA+T and MAX813LESA+T, the MAX708ESA+T uniquely provides synchronized active-low and active-high reset outputs without external components - optimizing board space and timing predictability in dual-reset μP architectures.
Availability
MAX708ESA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, and ruggedized network routers requiring stable component supply across extended temperature ranges and RoHS-compliant manufacturing.
Supply support for MAX708ESA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX705–MAX708/MAX813L family was designed specifically to replace discrete reset circuits in microprocessor systems - integrating voltage monitoring, manual reset, power-fail detection, and dual reset outputs into single SO-8 packages.
FAQ
What is the reset threshold voltage of the MAX708ESA+T?
The MAX708ESA+T has a nominal reset threshold of 4.40V with ±150mV tolerance and 40mV hysteresis. This means RESET and RESET assert when VCC falls below approximately 4.25V and release only after VCC rises above ~4.45V - preventing oscillation during slow power-down transitions. The threshold is factory-trimmed and guaranteed over -40°C to +85°C.
Does the MAX708ESA+T include a watchdog timer function?
No, the MAX708ESA+T does not include a watchdog timer. Unlike the MAX705/MAX706/MAX813L, the MAX708 substitutes the watchdog output (WDO) with a no-connect (N.C.) pin and adds an active-high RESET output. The MAX708ESA+T provides dual reset outputs and power-fail monitoring but relies on external circuitry or host software for watchdog supervision.
Can the MAX708ESA+T monitor voltages other than +5V?
Yes, the MAX708ESA+T can monitor auxiliary voltages using its PFI input. By connecting a resistor divider from the target rail (e.g., +12V or battery) to PFI, the 1.25V internal reference enables early-warning detection of supply degradation. For example, a 10:1 divider on +12V triggers PFO when the rail drops below ~11.0V - allowing μP-initiated shutdown before critical failure.
What is the purpose of the N.C. pin on the MAX708ESA+T?
Pin 8 on the MAX708ESA+T is designated N.C. (No Connect) and is not bonded internally. This reflects the MAX708's architecture: it omits the watchdog output (WDO) found on the MAX705/MAX706 and instead dedicates die area to the active-high RESET output. The N.C. pin requires no external connection - leaving it floating complies fully with datasheet specifications.
Is the MAX708ESA+T compatible with lead-free PCB assembly processes?
Yes, the MAX708ESA+T carries the "+" suffix indicating RoHS-compliant, lead-free terminations. It is qualified for reflow soldering at peak temperatures up to +260°C (per JEDEC J-STD-020), matching standard lead-free process requirements. The SO-8 package uses matte tin plating and meets IPC/JEDEC standards for wetting and intermetallic formation.
MAX708ESA+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:
- 4.4V
- 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
MAX708ESA+T FAQ
1.How can I place an order for MAX708ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708ESA+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 MAX708ESA+T reliable?
The price and inventory of MAX708ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708ESA+T is usually 5 days.
3.What payment methods are accepted for MAX708ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708ESA+T?
MAX708ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708ESA+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 MAX708ESA+T?
For technical support, including MAX708ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708ESA+T requirements.
6.How does Aetrix verify that MAX708ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX708ESA+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 MAX708ESA+T meets industry standards.
7.What is the process for return or replacement of MAX708ESA+T?
All MAX708ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708ESA+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 MAX708ESA+T part is unused and in its original packaging.
Return procedure for MAX708ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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