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Analog Devices Inc./Maxim Integrated MAX706CSA+T
- Part No.:
- MAX706CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706CSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,430
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Product details
Overview
MAX706CSA+T from Maxim Integrated is a microprocessor supervisory circuit providing power-on reset, watchdog timeout detection, power-fail warning, and manual-reset input in an 8-pin SO package. It asserts active-low RESET during power-up (VCC ≥ 1V), brownout (VCC < 4.40V), and manual trigger; features 1.6s watchdog timeout; and monitors auxiliary supplies via 1.25V PFI threshold. Used in embedded controllers requiring reliable boot sequencing and fault recovery.
For engineers reviewing the MAX706CSA+T datasheet, MAX706CSA+T pinout, MAX706CSA+T application, or MAX706CSA+T equivalent, this page delivers verified specifications, validated pin functions, confirmed alternative parts with documented differences, and real-world use cases for industrial control, instrumentation, and critical μP power monitoring systems.
Technical Context
The MAX706CSA+T integrates four core supervisory functions: a precision voltage monitor with 4.40V reset threshold and 40mV hysteresis; a 1.6s watchdog timer cleared by WDI edge transitions; a 1.25V comparator for power-fail or low-battery detection; and a debounced active-low manual-reset input with 250μA internal pull-up. All outputs are TTL/CMOS-compatible.
Its reset pulse width is guaranteed 140–280ms, with RESET valid down to VCC = 1V and output low-voltage ≤0.4V at ISINK = 3.2mA. The device operates from 1.0V to 5.5V supply and draws only 150–350μA quiescent current across 0°C to +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±0.15V - triggers RESET when VCC drops below this level, ensuring reliable brownout detection for +5V systems |
| Watchdog Timeout | 1.6s ±0.65s - provides deterministic system recovery if firmware fails to toggle WDI within this window |
| Reset Pulse Width | 200ms typical - guarantees sufficient duration to fully initialize microprocessors like 80C51 or ARM Cortex-M |
| PFI Threshold | 1.25V ±0.05V - enables accurate early-warning detection of power failure or battery depletion on auxiliary rails |
| Supply Current | 350μA max at +70°C - supports low-power operation in battery-backed or energy-constrained applications |
| VCC Operating Range | 1.0V to 5.5V - allows valid RESET assertion even during deep brownout, down to near-logic-threshold supply levels |
| MR Input Pull-Up | 250μA typical - eliminates need for external pull-up resistor when using pushbutton manual reset |
Pinout & Package
MAX706CSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with standard 1.27mm pitch and JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Triggers 200ms RESET pulse when pulled below 0.8V; internally pulled up with 250μA for switch interface |
| 2 VCC | +5V supply input | Primary power rail; RESET remains valid down to 1.0V, enabling robust low-voltage operation |
| 3 GND | Ground reference | Common return for all analog and digital functions; decoupling capacitor required at VCC–GND |
| 4 PFI | Power-fail input | Monitors auxiliary voltage via 1.25V comparator; drives PFO low when input falls below threshold |
| 5 PFO | Power-fail open-drain output | Sinks current when PFI < 1.25V; used for NMI interrupt or backup-enable signaling |
| 6 WDI | Watchdog input | Edge-sensitive input; toggling clears 1.6s timer; floating or high-Z disables watchdog function |
| 7 RESET | Active-low reset output | Push-pull output asserted low during power-up, brownout, or MR trigger; 200ms minimum pulse width |
| 8 WDO | Watchdog open-drain output | Pulls low on timeout or VCC brownout; no minimum pulse width-immediate response to supply collapse |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Ensures fail-safe reset assertion even during severe brownout, preventing undefined μP state |
| Debounced TTL/CMOS-compatible MR input | Eliminates external RC filtering; supports direct connection to logic lines or momentary switches |
| Independent watchdog with 1.6s timeout | Provides autonomous system recovery without software intervention, critical for unattended operation |
| 1.25V precision PFI comparator | Enables accurate monitoring of non-5V rails (e.g., +3.3V, +12V, or battery) using simple resistive dividers |
| 40mV reset threshold hysteresis | Prevents oscillation during slow VCC ramp-up/down, ensuring clean, glitch-free reset assertion |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Programmable logic controllers operating in factory environments with fluctuating 24V DC supplies and EMI exposure. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during 24V-to-5V regulator dropout and detecting early power degradation via PFI. Use Value: Prevents spurious program execution during brownout; enables orderly shutdown before data corruption occurs. |
Use Scenario: Portable ultrasound or blood glucose analyzers powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Monitoring battery voltage via PFI to generate PFO interrupt, while providing guaranteed RESET down to 1V during deep discharge. Use Value: Extends usable battery life by triggering controlled shutdown before undervoltage lockout, preserving calibration data. |
| Telecom Remote Terminal Units | Automotive Body Control Modules |
Use Scenario: Outdoor RTUs exposed to wide temperature swings (-40°C to +85°C) and intermittent solar charging. IC Role / Device Role / Timing Role: Providing 4.40V reset threshold compatible with 5V LDO tolerance, plus watchdog supervision of communication firmware. Use Value: Ensures reliable restart after power interruption; prevents hung states in UART/RS-485 firmware stacks. |
Use Scenario: Low-voltage 12V battery-supplied modules managing door locks, lighting, and sensors. IC Role / Device Role / Timing Role: Detecting battery sag below 11V via PFI divider and asserting RESET to halt MCU operation before EEPROM write corruption. Use Value: Avoids firmware crash during engine cranking; maintains nonvolatile memory integrity under transient load dumps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706ESA+ | Same functionality and pinout, but rated for -40°C to +85°C industrial temperature range | Required for extended-temperature deployments (e.g., outdoor telecom, automotive under-hood) | Select MAX706ESA+ when ambient operating temperature exceeds +70°C |
| MAX705CSA+ | Identical package and pinout, but 4.65V reset threshold instead of 4.40V | Suitable for systems with tighter 5V supply regulation where earlier reset assertion is needed | Choose MAX705CSA+ for designs requiring reset at higher VCC threshold to accommodate LDO tolerance |
Compared with MAX706CSA+T, MAX706ESA+ extends thermal reliability without changing layout or firmware, while MAX705CSA+ shifts reset timing upward by 250mV-critical for systems where 4.40V threshold risks late reset assertion during marginal 5V rail performance.
Availability
MAX706CSA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom remote terminal units, and automotive body control modules requiring stable component supply across production lifecycles.
Supply support for MAX706CSA+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 family was designed specifically for cost-sensitive microprocessor supervisory applications, integrating reset, watchdog, power-fail, and manual-reset functions into compact 8-pin packages to reduce board space and system complexity.
FAQ
What is the reset threshold voltage for MAX706CSA+T?
The MAX706CSA+T has a nominal reset threshold of 4.40V with ±0.15V tolerance. This means RESET is asserted low whenever VCC drops below approximately 4.25V and remains low until VCC rises above 4.50V, providing hysteresis to prevent chatter during supply transients. This threshold is factory-trimmed and specified over the full 0°C to +70°C operating range.
Does MAX706CSA+T provide both active-low and active-high reset outputs?
No, the MAX706CSA+T provides only an active-low RESET output and a separate open-drain watchdog output (WDO). Unlike the MAX707/MAX708 variants, it does not include an active-high RESET signal. The MAX706CSA+T is functionally identical to the MAX706 series, which retains the classic dual-output (RESET + WDO) architecture optimized for μP reset and watchdog fault signaling.
Can MAX706CSA+T monitor voltages other than the main VCC supply?
Yes, the MAX706CSA+T can monitor auxiliary voltages using its PFI (Power-Fail Input) pin, which compares against an internal 1.25V reference. By connecting a resistive divider from the target supply (e.g., +12V or +3.3V) to PFI, designers can configure early-warning detection for power failure or battery depletion. The PFI input draws less than ±25nA, minimizing loading on the monitored rail.
What is the watchdog timeout period for MAX706CSA+T?
The MAX706CSA+T features a fixed 1.6s watchdog timeout period, with a typical value of 1.60s and a guaranteed range of 1.00s to 2.25s over temperature and voltage. The timer resets on any rising or falling edge at the WDI pin, and is also cleared automatically during RESET assertion or when WDI is placed in high-impedance state.
Is MAX706CSA+T RoHS-compliant and lead-free?
Yes, MAX706CSA+T is RoHS-compliant and lead-free. The "+T" suffix explicitly denotes lead(Pb)-free packaging per Maxim Integrated's ordering convention. It uses standard 8-pin SO packaging with matte-tin lead finish and meets JEDEC J-STD-020 reflow profile requirements for lead-free soldering at +260°C peak temperature.
MAX706CSA+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, 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
MAX706CSA+T FAQ
1.How can I place an order for MAX706CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706CSA+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 MAX706CSA+T reliable?
The price and inventory of MAX706CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706CSA+T is usually 5 days.
3.What payment methods are accepted for MAX706CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706CSA+T?
MAX706CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706CSA+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 MAX706CSA+T?
For technical support, including MAX706CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706CSA+T requirements.
6.How does Aetrix verify that MAX706CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX706CSA+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 MAX706CSA+T meets industry standards.
7.What is the process for return or replacement of MAX706CSA+T?
All MAX706CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706CSA+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 MAX706CSA+T part is unused and in its original packaging.
Return procedure for MAX706CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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