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Analog Devices Inc./Maxim Integrated MAX708TCSA+
- Part No.:
- MAX708TCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708TCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:636
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Product details
Overview
MAX708TCSA+ from Maxim Integrated is a +3V microprocessor supervisory circuit providing active-low RESET and active-high RESET outputs, 3.08V reset threshold, 200ms reset pulse width, and 1.25V power-fail comparator input - used in battery-powered instruments to ensure reliable µP reset during brownout conditions.
For engineers reviewing the MAX708TCSA+ datasheet, MAX708TCSA+ pinout, MAX708TCSA+ application, or MAX708TCSA+ equivalent, this page delivers verified functional identity, package mapping, timing behavior, voltage-monitoring accuracy, and real-world substitution guidance for industrial and portable embedded designs.
Technical Context
The MAX708TCSA+ integrates dual-reset logic (RESET and RESET) with independent power-fail detection via a 1.25V internal reference and PFI input. Its reset generator asserts both outputs when VCC falls below 3.08V or MR is pulled low, holding them asserted for ≥200ms after recovery.
No watchdog timer is present - unlike MAX706 variants - making it suitable for systems requiring deterministic reset control without timeout supervision. The device operates across 1.2V to 5.5V supply range and guarantees RESET assertion down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (VCC falling); ensures reset activation before 3.3V µP supply violates minimum operating voltage |
| Reset Pulse Width | 200ms minimum; provides sufficient hold time for full µP initialization and peripheral stabilization |
| Supply Voltage Range | 1.2V to 5.5V; supports operation during deep brownout and compatibility with 3.3V/5V systems |
| Quiescent Current | 100µA typical; enables long battery life in portable instrumentation and handheld devices |
| Power-Fail Threshold | 1.25V on PFI pin; allows configurable early-warning detection of unregulated rail collapse via external resistor divider |
| Output Drive Strength | RESET sinks 1.2mA at 0.3V; RESET sources 500µA at 0.8×VCC - sufficient for direct CMOS/TTL µP reset inputs |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded applications including controllers and test equipment |
Pinout & Package
MAX708TCSA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount compatible with standard reflow profiles and IPC-compliant PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Debounced TTL/CMOS-compatible trigger; pulls internal 70µA current source - connect to GND via switch to force reset |
| 2 VCC | Positive supply input | Accepts 1.2V–5.5V; powers all internal comparators, timers, and output drivers |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO when input falls below 1.25V - used for pre-brownout warning |
| 5 PFO | Active-low power-fail output | Sinks current when PFI < 1.25V; can drive µP interrupt or feed back to MR for cascaded reset initiation |
| 6 RESET | Active-low reset output | Asserted low during power-up/brownout; remains low ≥200ms after VCC exceeds 3.08V |
| 7 RESET | Active-high reset output | Complementary to RESET; high during fault, low during normal operation - supports mixed-logic µP interfaces |
| 8 N.C. | No connection | Not internally bonded; leave floating - no routing or thermal consideration required |
Key Features
| Feature | Design Value |
|---|---|
| Dual active-reset outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate need for external inverters in mixed-logic systems |
| Precision 3.08V reset threshold | Tight ±1.5% tolerance over temperature ensures reliable reset timing for 3.3V µPs without undershoot risk |
| Guaranteed reset assertion to VCC = 1V | Enables fail-safe behavior even during severe brownout - critical for data retention and state recovery |
| 1.25V internal reference for PFI | Allows accurate, temperature-stable monitoring of auxiliary rails (e.g., 12V, -5V) using simple resistor networks |
| 200ms reset time delay | Fixed, factory-trimmed timing eliminates external RC components and layout sensitivity |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Continuous field measurement with periodic flash writes and sleep cycles. IC Role / Device Role / Timing Role: Supervisory circuit ensuring µP remains held in reset until 3.3V rail stabilizes post-wake, and triggers orderly shutdown when main battery drops below 3.08V. Use Value: Prevents corrupted EEPROM writes and invalid sensor reads during marginal supply conditions. |
Use Scenario: Modular I/O expansion chassis with hot-swap capability and distributed power domains. IC Role / Device Role / Timing Role: Dual-reset outputs coordinate simultaneous reset of host controller and isolated field-side ASICs during local 3.3V rail collapse. Use Value: Eliminates metastability and bus contention by guaranteeing synchronized release across multiple voltage domains. |
| Medical Handheld Diagnostics | Network Edge Routers (Control Plane) |
|
Use Scenario: Portable ultrasound or glucose meter with Li-ion battery and USB charging. IC Role / Device Role / Timing Role: Monitors battery voltage via PFI divider to warn of imminent shutdown and initiates safe state save before VCC falls below 3.08V. Use Value: Meets IEC 62304 Class B software safety requirements by enabling deterministic power-loss response. |
Use Scenario: Control-plane processor managing packet forwarding engines and management interfaces. IC Role / Device Role / Timing Role: Provides fail-safe reset coordination between CPU, FPGA configuration logic, and PHY management blocks during 3.3V domain brownout. Use Value: Avoids partial configuration states that could cause traffic black holes or management interface lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708SCSA+ | 2.93V reset threshold; otherwise identical pinout, timing, and dual-output architecture | Suitable where system requires earlier reset assertion (e.g., margin-sensitive 3.3V µPs with tighter VDDMIN) | Select MAX708SCSA+ only if design validation confirms 2.93V threshold improves robustness without false triggering |
| TPS3808G33DBVR | Single active-low reset output; 3.3V threshold; 200ms delay; lower quiescent current (1.8µA) | Lacks complementary RESET output and PFI/PFO functionality - requires external circuitry for power-fail warning | Choose TPS3808G33DBVR only when dual-reset is unnecessary and ultra-low power dominates design priority |
Compared with MAX708TCSA+, MAX708SCSA+ offers earlier reset activation but identical supervision architecture, while TPS3808G33DBVR reduces supply current by >98% but sacrifices dual-output flexibility and integrated power-fail detection - trade-offs require board-level validation.
Availability
MAX708TCSA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply across commercial temperature range and long-term production cycles.
Supply support for MAX708TCSA+ 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 power, sensing, and connectivity applications in industrial, medical, and communications markets.
The MAX708 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-monitoring and reset generation in resource-constrained embedded systems operating from 3V supplies.
FAQ
What is the reset threshold voltage of the MAX708TCSA+?
The MAX708TCSA+ has a factory-trimmed reset threshold of 3.08V (VCC falling), with ±1.5% tolerance over temperature. This value is specified in the Electrical Characteristics table and ensures reliable reset activation before a 3.3V microprocessor violates its minimum supply requirement. The MAX708TCSA+ guarantees this threshold across its full 0°C to +70°C operating range.
Does the MAX708TCSA+ include a watchdog timer function?
No, the MAX708TCSA+ does not include a watchdog timer. Unlike the MAX706 family, the MAX708 series replaces the WDI/WDO pins with dual reset outputs (RESET and RESET). The MAX708TCSA+ pinout omits WDI and WDO entirely - confirmed by Pin Description and Pin Configurations sections - making it appropriate for systems requiring only voltage supervision and deterministic reset control.
What are the key differences between MAX708TCSA+ and MAX706TCSA+?
The MAX708TCSA+ provides both active-low RESET and active-high RESET outputs, whereas MAX706TCSA+ offers only a single active-low RESET output and includes WDI/WDO pins for watchdog functionality. Additionally, MAX708TCSA+ lacks watchdog circuitry, has no WDI input, and dedicates pins 6 and 7 to dual reset signals instead of WDO and RESET. These differences make them non-interchangeable without PCB modification.
Can the MAX708TCSA+ monitor a negative supply voltage?
Yes, the MAX708TCSA+ can monitor a negative supply using its PFI input with an external resistor network as shown in Figure 8 of the datasheet. By connecting the negative rail through resistors R1 and R2 to PFI, the internal 1.25V reference creates a trip point where PFO transitions when the negative voltage crosses a calculated threshold. Accuracy depends on resistor tolerance, PFI input current (±25nA), and VCC stability.
Is the MAX708TCSA+ pin-compatible with other MAX708 variants like MAX708RCSA+ or MAX708SCSA+?
Yes, all MAX708x variants - including MAX708RCSA+, MAX708SCSA+, and MAX708TCSA+ - share identical 8-pin SO (S8-2) package, pinout, and electrical interface. The only difference is reset threshold voltage (2.63V, 2.93V, or 3.08V), allowing drop-in replacement when the target threshold matches system requirements. No PCB changes are needed when substituting within the MAX708 family.
MAX708TCSA+ 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:
- 3.08V
- 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
MAX708TCSA+ FAQ
1.How can I place an order for MAX708TCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708TCSA+ 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 MAX708TCSA+ reliable?
The price and inventory of MAX708TCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708TCSA+ is usually 5 days.
3.What payment methods are accepted for MAX708TCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708TCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708TCSA+?
MAX708TCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708TCSA+ 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 MAX708TCSA+?
For technical support, including MAX708TCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708TCSA+ requirements.
6.How does Aetrix verify that MAX708TCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX708TCSA+ 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 MAX708TCSA+ meets industry standards.
7.What is the process for return or replacement of MAX708TCSA+?
All MAX708TCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708TCSA+, 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 MAX708TCSA+ part is unused and in its original packaging.
Return procedure for MAX708TCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX708TCSA+ Tags
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