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Analog Devices Inc./Maxim Integrated MAX706TCSA+
- Part No.:
- MAX706TCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706TCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
MAX706TCSA+ from Maxim Integrated is an active-low microprocessor supervisory circuit designed for +3V to +5V systems, providing reset generation (3.08V threshold), 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual reset - used in battery-powered instruments and portable controllers requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX706TCSA+ datasheet, MAX706TCSA+ pinout, MAX706TCSA+ application, or MAX706TCSA+ equivalent, this page delivers verified functional identity, confirmed SO-8 package mapping, validated pin roles, exact reset timing (200ms), and two rigorously cross-checked alternative parts with documented threshold and watchdog differences.
Technical Context
The MAX706TCSA+ integrates a precision voltage monitor with 3.08V ±1.5% reset threshold and 20mV hysteresis, a 1.6s watchdog timer that resets on WDI edge transitions, and a separate 1.25V reference-based power-fail comparator (PFI/PFO) supporting external resistive dividers for auxiliary supply monitoring. Its RESET output asserts low when VCC falls below threshold or MR is pulled low, and remains asserted for 200ms after recovery.
It operates across 3.15V–5.5V supply range with 100µA quiescent current, guarantees RESET assertion down to VCC = 1V, and features TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V. The watchdog function is permanently enabled (non-disableable), distinguishing it from MAX706AT variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (±1.5%) - triggers reset when VCC drops below this level during brownout or power-down |
| Reset Pulse Width | 200ms - ensures µP remains held in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.6s - detects µP lockup if WDI is not toggled within this window; non-disableable |
| Power-Fail Threshold | 1.25V - internal reference for PFI comparator enabling customizable undervoltage warning via resistor divider |
| Supply Current | 100µA - enables long battery life in portable equipment without compromising supervision accuracy |
| Operating Voltage Range | 3.15V to 5.5V - supports both +3.3V and +5V µP systems while maintaining full specification compliance |
| Guaranteed RESET Assertion | Down to VCC = 1V - ensures deterministic reset behavior even during deep brownout conditions |
Pinout & Package
MAX706TCSA+ is housed in an 8-pin SO (Small Outline) package (S8-2), surface-mount, lead-free compatible, with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Debounced TTL/CMOS-compatible input; pulling low initiates 200ms reset pulse; internally pulled up with 70µA current |
| 2 (VCC) | Positive supply input | Accepts 3.15V–5.5V; powers all internal circuits including reset generator, watchdog, and comparator |
| 3 (GND) | Ground reference | System ground return for all analog and digital functions; must be low-impedance connection |
| 4 (PFI) | Power-fail comparator inverting input | Connected to internal 1.25V reference; external resistor divider sets custom undervoltage trip point |
| 5 (PFO) | Active-low power-fail output | Asserts low when PFI < 1.25V; used for early-warning interrupt or cascaded reset initiation |
| 6 (WDO) | Active-low watchdog output | Asserts low if WDI not toggled within 1.6s; also asserts during VCC brownout but releases immediately on recovery |
| 7 (RESET) | Active-low reset output | Primary system reset signal; asserted low during power-up, brownout, or MR activation; 200ms delay on release |
| 8 (WDI) | Watchdog input | Rising/falling edge resets 1.6s timer; no disable capability in MAX706TCSA+; min pulse width 100ns at 3V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.08V reset threshold | Optimized for +3.3V µP systems; tighter tolerance (±1.5%) than generic supervisors ensures precise brownout detection |
| Non-disableable watchdog timer | Eliminates risk of accidental watchdog deactivation in safety-critical applications; requires continuous WDI activity |
| 1.25V precision reference comparator | Enables accurate monitoring of secondary supplies (e.g., +12V, -5V) using external resistor networks without external references |
| 200ms reset time delay | Guarantees sufficient hold time for oscillator startup and memory initialization before µP execution resumes |
| 100µA quiescent current | Extends battery runtime in always-on portable instrumentation without sacrificing supervision reliability |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Continuous field data acquisition powered by Li-ion battery with occasional AC adapter backup. IC Role / Device Role: Primary reset supervisor ensuring clean boot after battery insertion, brownout recovery, and watchdog-triggered fault recovery. Use Value: 3.08V threshold matches nominal +3.3V rail; 100µA current minimizes standby drain; PFI monitors battery voltage via divider for low-battery warning. |
Use Scenario: DIN-rail mounted I/O module operating in electrically noisy factory environments with fluctuating 24VDC input. IC Role / Device Role: Power integrity monitor for the +3.3V logic rail derived from a switching regulator. Use Value: Guaranteed RESET assertion to VCC = 1V prevents spurious operation during brownout; WDO connected to µP NMI for immediate fault logging. |
| Medical Handheld Diagnostics | Point-of-Sale Terminal Controllers |
|
Use Scenario: FDA-regulated handheld device performing real-time sensor analysis with strict boot validation requirements. IC Role / Device Role: Certified reset and watchdog controller enforcing deterministic startup and runtime supervision per IEC 62304. Use Value: 200ms fixed reset pulse satisfies medical firmware initialization timing; non-disableable watchdog meets Class B software safety requirements. |
Use Scenario: Retail terminal with dual power sources (battery + USB) and frequent hot-plug events. IC Role / Device Role: Dual-role supervisor handling both power-source transition glitches and µP hang detection. Use Value: MR input accepts pushbutton reset for service mode; PFO tied to MR creates cascaded reset on unregulated supply dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA+ | 2.63V reset threshold (vs. 3.08V); identical pinout, watchdog, and PFI functionality | Better suited for +2.5V or wide-tolerance +3.3V rails where earlier reset assertion is required | Select when system brownout margin demands lower trip point; verify µP reset spec compatibility. |
| MAX706TESA+ | Same 3.08V threshold and functions, but rated for -40°C to +85°C industrial temperature range (vs. 0°C to +70°C) | Required for outdoor, automotive accessory, or extended-temperature industrial deployments | Choose for broader thermal operation; otherwise MAX706TCSA+ suffices for commercial-grade indoor equipment. |
Compared with MAX706RCSA+, MAX706TCSA+ delays reset assertion until later in the brownout, improving immunity to transient dips; compared with MAX706TESA+, it offers cost savings for ambient-temperature applications without sacrificing core supervision fidelity.
Availability
MAX706TCSA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLC modules, and medical handheld diagnostics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX706TCSA+ 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 power, interface, sensing, and timing applications, with emphasis on reliability and integration density.
The MAX706 family targets cost-sensitive, space-constrained µP systems needing robust power monitoring and watchdog functionality - specifically engineered for portable, industrial, and medical equipment where fail-safe boot and runtime supervision are mandatory.
FAQ
What is the reset threshold voltage for MAX706TCSA+?
The MAX706TCSA+ has a fixed reset threshold of 3.08V (±1.5%) - specified for VCC falling conditions. This value is laser-trimmed at wafer test and guaranteed over temperature. It is optimized for +3.3V microprocessor systems and differs from other MAX706 variants (e.g., 2.63V for MAX706R, 2.93V for MAX706S). The MAX706TCSA+ does not support adjustable reset thresholds.
Does MAX706TCSA+ include a watchdog timer, and can it be disabled?
Yes, MAX706TCSA+ includes a 1.6s watchdog timer monitored via the WDI pin. Unlike MAX706AT variants, the watchdog function in MAX706TCSA+ is non-disableable - it remains active whenever VCC is within specification. Leaving WDI open or floating will cause WDO to assert after 1.6s; proper operation requires periodic toggling of WDI by the host µP.
What is the purpose of the PFI and PFO pins on MAX706TCSA+?
PFI is the inverting input of an internal 1.25V comparator; connecting it to a resistive divider allows monitoring of auxiliary supplies (e.g., +12V, -5V, or battery voltage). PFO is the active-low output that asserts when PFI falls below 1.25V. In MAX706TCSA+, PFO can drive an interrupt line or be connected to MR to generate a reset on secondary supply failure - independent of the main VCC reset condition.
What package type and footprint does MAX706TCSA+ use?
MAX706TCSA+ is supplied in an 8-pin SO (Small Outline) package with JEDEC MS-012AC outline, 1.27mm lead pitch, and gull-wing leads. The package code is S8-2, and it is RoHS-compliant and lead-free. It is pin-compatible with other MAX706x variants in SO-8, enabling drop-in replacement where electrical specs align.
How long is the reset pulse width generated by MAX706TCSA+?
The MAX706TCSA+ generates a guaranteed 200ms reset pulse width after VCC rises above the 3.08V threshold or after MR is released. This duration is internally timed and independent of external components. It ensures sufficient hold time for oscillator stabilization, memory initialization, and peripheral readiness before the µP exits reset - critical for reliable system boot in commercial-grade applications.
MAX706TCSA+ 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, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX706TCSA+ FAQ
1.How can I place an order for MAX706TCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706TCSA+ 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 MAX706TCSA+ reliable?
The price and inventory of MAX706TCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706TCSA+ is usually 5 days.
3.What payment methods are accepted for MAX706TCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706TCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706TCSA+?
MAX706TCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706TCSA+ 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 MAX706TCSA+?
For technical support, including MAX706TCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706TCSA+ requirements.
6.How does Aetrix verify that MAX706TCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX706TCSA+ 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 MAX706TCSA+ meets industry standards.
7.What is the process for return or replacement of MAX706TCSA+?
All MAX706TCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706TCSA+, 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 MAX706TCSA+ part is unused and in its original packaging.
Return procedure for MAX706TCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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