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Analog Devices Inc./Maxim Integrated MAX708TESA+T
- Part No.:
- MAX708TESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708TESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:786
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Product details
Overview
MAX708TESA+T from Maxim Integrated is a +3V microprocessor supervisory circuit with dual active-high and active-low reset outputs, 3.08V reset threshold, 200ms reset pulse width, 100µA quiescent current, and power-fail comparator (1.25V reference). It monitors VCC in battery-powered embedded systems to ensure reliable µP startup and brownout recovery.
For engineers reviewing the MAX708TESA+T datasheet, MAX708TESA+T pinout, MAX708TESA+T application, or MAX708TESA+T equivalent, this page delivers verified electrical parameters, SO-8 package mapping, functional role in power sequencing, and validated alternative options for industrial and portable equipment design.
Technical Context
The MAX708TESA+T integrates a precision voltage monitor with hysteresis (20mV), a guaranteed RESET assertion down to VCC = 1V, and independent PFI/PFO circuitry for external supply monitoring. Its dual-reset architecture (RESET and RESET) enables direct interface with µP reset inputs requiring either polarity without external inversion.
Unlike MAX706 variants, the MAX708 series omits the watchdog timer but adds simultaneous active-high and active-low reset signals. The 3.08V reset threshold is factory-trimmed and specified over –40°C to +85°C, supporting stable operation in automotive-grade temperature environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (VCC falling); ensures reset assertion before 3.3V µP supply dropout |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and peripheral stabilization |
| Quiescent Current | 100µA max at VCC < 3.6V; enables long battery life in portable instruments |
| Supply Range | 1.2V to 5.5V; guarantees RESET assertion even during deep brownout (down to 1.2V) |
| Power-Fail Threshold | 1.25V internal reference; supports adjustable PFI monitoring of auxiliary supplies via resistor divider |
| Output Drive | RESET: VOL ≤ 0.3V @ 1.2mA sink; RESET: VOH ≥ 0.8×VCC @ 500µA source - compatible with TTL/CMOS logic |
| Operating Temp | –40°C to +85°C; qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MAX708TESA+T is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compliant, with standard 1.27mm pitch and JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA; debounced by 200ms reset timing |
| 2 VCC | Positive supply input | Accepts 1.2V–5.5V; RESET/RESET asserted until VCC exceeds 3.08V and stabilizes |
| 3 GND | Ground reference | Common return for all internal comparators and output drivers |
| 4 PFI | Power-fail comparator input | Monitors external supply via resistive divider; triggers PFO when voltage falls below 1.25V |
| 5 PFO | Active-low power-fail output | Open-drain output; sinks current when PFI < 1.25V; used for early-warning interrupt or MR triggering |
| 6 RESET | Active-low reset output | Asserted low during power-up/brownout; held for 200ms after VCC rises above 3.08V |
| 7 RESET | Active-high reset output | Complementary to RESET; high during fault conditions; eliminates need for external inverter |
| 8 NC | No connection | Not internally bonded; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate external level-shifting components |
| Guaranteed reset at low VCC | RESET asserted down to VCC = 1.2V - critical for graceful shutdown in collapsing supply scenarios |
| Adjustable power-fail detection | PFI input referenced to precise 1.25V bandgap; supports monitoring of +5V, +12V, or negative rails via external dividers |
| Low-power operation | 100µA max supply current enables use in always-on battery backup circuits without significant drain |
| Industrial temperature range | –40°C to +85°C operation confirmed across full electrical specs - suitable for harsh-environment controllers |
Applications
| Portable Medical Devices | Industrial PLC Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meters and handheld diagnostic tools requiring fail-safe boot and low-voltage shutdown. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and triggers controlled firmware save before battery depletion. Use Value: 200ms reset pulse ensures EEPROM write completion; 1.25V PFI reference enables accurate low-battery warning at 3.0V cutoff. |
Use Scenario: DIN-rail mounted programmable logic controllers operating in factory-floor environments with fluctuating 24V DC supplies. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail and asserts both RESET polarities to accommodate mixed µP families on same PCB. Use Value: Dual-reset outputs reduce BOM count; –40°C to +85°C rating ensures reliability during thermal cycling in unconditioned enclosures. |
| Smart Energy Meters | Network Edge Routers |
|
Use Scenario: ANSI C12.20-compliant electricity meters with supercapacitor backup and tamper-detection circuitry. IC Role / Device Role / Timing Role: Provides brownout immunity during AC line sags and coordinates secure shutdown via PFO-triggered MR pulse. Use Value: 3.08V threshold matches 3.3V regulator dropout; 100µA quiescent current extends supercap runtime by >15% vs. legacy supervisors. |
Use Scenario: Carrier-grade Ethernet routers with multi-rail power domains (12V, 5V, 3.3V) and hot-swap capability. IC Role / Device Role / Timing Role: Resets control µP and FPGA configuration logic simultaneously using complementary RESET signals. Use Value: Guaranteed RESET assertion to VCC = 1.2V prevents metastability during 12V-to-3.3V converter turn-on transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708TEPA | Same functionality and specs, but in 8-pin PDIP (P8-1) package instead of SO-8 | Through-hole assembly; suited for prototyping, legacy designs, or high-reliability military/aerospace boards | Select MAX708TEPA only if through-hole mounting is required; identical electrical behavior and pinout (except NC pin position differs) |
| TPS3808G30DBVR | Single active-low reset; 3.0V threshold; 200ms delay; 1.6µA quiescent current; no dual-reset or PFI | Limited to basic reset supervision; lacks power-fail comparator and complementary reset outputs | Choose TPS3808G30DBVR only when ultra-low power dominates requirements and dual-reset/PFI are unnecessary |
Compared with MAX708TEPA, MAX708TESA+T offers superior board-space efficiency and reflow compatibility; compared with TPS3808G30DBVR, it delivers essential dual-reset signaling and system-level power-fail monitoring - features critical for robust industrial and medical designs.
Availability
MAX708TESA+T is available at Aetrix Electronics and suitable for industrial PLC modules, portable medical devices, smart energy meters, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX708TESA+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 MAX708 family was designed specifically for cost-sensitive, space-constrained embedded systems needing reliable power-supply monitoring and dual-polarity reset signaling without external components.
FAQ
What is the reset threshold voltage of the MAX708TESA+T?
The MAX708TESA+T has a factory-trimmed reset threshold of 3.08V (VCC falling), with ±75mV tolerance and 20mV hysteresis. This value is guaranteed over the full –40°C to +85°C operating range and ensures reliable reset assertion before 3.3V µP supply instability occurs. The threshold is fixed and not user-adjustable.
Does the MAX708TESA+T include a watchdog timer function?
No, the MAX708TESA+T does not include a watchdog timer. It belongs to the MAX708 series, which replaces the watchdog circuit found in MAX706 variants with dual active-high and active-low reset outputs (RESET and RESET). If watchdog functionality is required, consider the MAX706TESA+T instead.
Can the MAX708TESA+T monitor voltages other than VCC?
Yes, the MAX708TESA+T can monitor auxiliary supplies using its PFI (Power-Fail Input) pin, which references an internal 1.25V comparator. By connecting PFI to a resistive divider from any DC supply (e.g., +5V, +12V, or negative rails), users can configure early-warning power-fail detection independent of VCC.
What is the purpose of the NC pin on the MAX708TESA+T?
Pin 8 of the MAX708TESA+T is marked NC (No Connection) and is not internally bonded. It must remain unconnected in the PCB layout. Connecting it to any signal or supply may cause unpredictable behavior or damage, as confirmed in the official Maxim datasheet Pin Description table.
How does the MAX708TESA+T behave when VCC drops below 1.2V?
The MAX708TESA+T guarantees RESET assertion down to VCC = 1.2V. Below this voltage, the RESET output becomes high-impedance (open-drain), while RESET remains high. To maintain a defined logic state, a pull-down resistor (e.g., 100kΩ) on the RESET pin is recommended per Figure 6 in the datasheet.
MAX708TESA+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:
- 3.08V
- 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
MAX708TESA+T FAQ
1.How can I place an order for MAX708TESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708TESA+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 MAX708TESA+T reliable?
The price and inventory of MAX708TESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708TESA+T is usually 5 days.
3.What payment methods are accepted for MAX708TESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708TESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708TESA+T?
MAX708TESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708TESA+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 MAX708TESA+T?
For technical support, including MAX708TESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708TESA+T requirements.
6.How does Aetrix verify that MAX708TESA+T is sourced from the original manufacturer or authorized distributors?
All MAX708TESA+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 MAX708TESA+T meets industry standards.
7.What is the process for return or replacement of MAX708TESA+T?
All MAX708TESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708TESA+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 MAX708TESA+T part is unused and in its original packaging.
Return procedure for MAX708TESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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