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Analog Devices Inc./Maxim Integrated MAX706PCSA+
- Part No.:
- MAX706PCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX706PCSA+.pdf
- Description:
- IC MPU SUPERVISORY CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,680
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Product details
Overview
MAX706PCSA+ from Maxim Integrated is an active-high reset, +3V microprocessor supervisory circuit in 8-pin SO package, providing power-up/down/brownout reset (200ms delay), 1.6s watchdog timer, 1.25V power-fail comparator input (PFI), and debounced manual-reset input (MR). It operates from 2.7V to 5.5V and guarantees RESET assertion down to VCC = 1V - used in battery-powered portable instruments and embedded controllers requiring reliable power monitoring.
For engineers reviewing the MAX706PCSA+ datasheet, MAX706PCSA+ pinout, MAX706PCSA+ application, or MAX706PCSA+ equivalent, key selection criteria include its 2.63V reset threshold, active-high RESET output, watchdog disable capability via high-impedance WDI, 100µA quiescent current, and guaranteed operation across 0°C to +70°C.
Technical Context
The MAX706PCSA+ integrates a precision voltage monitor with 2.63V ±1.5% reset threshold and 20mV hysteresis, a 1.6s watchdog timer with transition detection on WDI (pulse width ≥100ns at 3V), and a 1.25V reference-based power-fail comparator (PFI/PFO) supporting external resistive dividers for auxiliary supply monitoring. Its internal 70µA MR pullup enables direct pushbutton interfacing without external components.
Unlike MAX706R/S/T variants, the MAX706PCSA+ asserts an active-high RESET signal and belongs to the MAX706P/AP family - meaning it lacks watchdog disable by default but retains full watchdog functionality. It draws only 100µA typical supply current and maintains valid RESET output down to VCC = 1V, ensuring robust low-voltage supervision during brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% - precisely monitors +3V systems; triggers reset before µP instability occurs. |
| Reset Pulse Width | 200ms minimum - ensures sufficient time for µP initialization and peripheral stabilization. |
| Watchdog Timeout | 1.6s ±40% - provides deterministic software liveliness check without excessive timeout latency. |
| Quiescent Current | 100µA max at +25°C - enables multi-year battery life in portable equipment. |
| Supply Range | 2.7V to 5.5V - supports dual-supply operation (e.g., +3.3V µP with +5V peripherals). |
| PFI Threshold | 1.25V ±20mV - enables accurate power-fail or low-battery warning using external resistor divider. |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade embedded instrumentation and computing applications. |
Pinout & Package
MAX706PCSA+ 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 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA; 500ns min pulse width at 3V; debounces pushbutton resets. |
| 2 (VCC) | Positive supply input | Accepts 2.7V–5.5V; bypassing with 0.1µF capacitor to GND recommended for noise immunity. |
| 3 (GND) | Ground reference | Common return path for all internal circuits and outputs; must be low-impedance connection. |
| 4 (PFI) | Power-fail comparator input | Monitors external voltage via resistive divider; asserts PFO when input 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 cascaded reset. |
| 6 (WDI) | Watchdog input | Edge-sensitive; requires toggle within 1.6s; high-impedance state disables watchdog in AP-series (not applicable to P-series). |
| 7 (RESET) | Active-high reset output | Push-pull output; remains high during VCC < 2.63V or MR low; deasserts 200ms after recovery. |
| 8 (WDO) | Active-low watchdog output | Open-drain; goes low on watchdog timeout or VCC drop; can drive NMI or MR for system-level recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Active-high RESET output | Eliminates need for external inverter in µP designs requiring high-true reset assertion. |
| Guaranteed RESET at VCC = 1V | Ensures fail-safe behavior during deep brownout; prevents µP from exiting reset prematurely. |
| 200ms reset time delay | Meets JEDEC JESD8-12E timing requirements for most 8-/16-bit microcontrollers. |
| 1.25V precision PFI reference | Enables accurate monitoring of secondary supplies (e.g., +12V, -5V) with <1% trip-point error using 1% resistors. |
| 100µA quiescent current | Reduces standby power in always-on battery systems - e.g., 10-year life on 200mAh coin cell. |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers |
|---|---|
|
Use Scenario: Handheld multimeter powered by two AA alkaline cells with AC adapter backup. IC Role / Device Role / Timing Role: Supervises main +3.3V rail and detects battery depletion via PFI-connected divider; asserts RESET before µP executes corrupted code. Use Value: Prevents data loss during battery swap and extends usable runtime by enabling graceful shutdown upon PFO-triggered interrupt. |
Use Scenario: PLC I/O module operating in factory environment with fluctuating 24V DC input. IC Role / Device Role / Timing Role: Monitors regulated +3.3V logic supply and watches µP firmware execution via WDI; generates hardware reset on brownout or lockup. Use Value: Eliminates need for external RC reset networks and reduces BOM count while improving MTBF by >30% versus discrete solutions. |
| Embedded Computing Systems | Intelligent Sensors |
|
Use Scenario: Edge gateway board with ARM Cortex-M4, dual-supply (3.3V core, 5V I/O), and real-time clock backup. IC Role / Device Role / Timing Role: Provides synchronized power-on reset, monitors VBAT for RTC health, and services watchdog via periodic HAL tick. Use Value: Ensures deterministic boot sequence and prevents runaway firmware - critical for OTA update reliability. |
Use Scenario: Wireless temperature sensor node with ultra-low-power MCU and Li-SOCl₂ primary battery. IC Role / Device Role / Timing Role: Supervises +3.0V supply, triggers PFO-based wake-up interrupt on low-battery condition, and holds µP in reset until stable voltage returns. Use Value: Enables predictive maintenance alerts and avoids undervoltage-induced flash corruption during sleep/wake transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCSA+ | 2.93V reset threshold; same pinout, active-high RESET, identical SO-8 package. | Suitable for +3.3V systems where tighter margin above 3.0V is required; not drop-in for 2.63V-critical designs. | Select when main supply nominal is 3.3V ±5% and brownout tolerance must exceed 3.0V. |
| TPS3808G01DBVR | Adjustable reset threshold (via external resistor); 35µA IQ; no integrated watchdog or PFI comparator. | Lacks power-fail warning and watchdog functions; requires external components for equivalent feature set. | Choose only if design prioritizes ultra-low quiescent current over integrated supervision features. |
Compared with MAX706SCSA+, the MAX706PCSA+ offers lower reset threshold for earlier intervention in marginal +3V rails; compared with TPS3808G01DBVR, it delivers full supervision (reset + watchdog + PFI) in one die with no external components - reducing layout area by 40% and qualification effort.
Availability
MAX706PCSA+ 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 continuity.
Supply support for MAX706PCSA+ 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, mixed-signal, and power management ICs for demanding industrial, computing, and communications applications.
The MAX706 family targets cost-sensitive, space-constrained µP systems needing integrated power supervision - delivering reset, watchdog, and power-fail detection in a single 8-pin SO package with minimal external components.
FAQ
What is the reset threshold voltage for MAX706PCSA+?
The MAX706PCSA+ has a fixed reset threshold of 2.63V ±1.5%, specified over temperature and supply voltage. This value is laser-trimmed during production and guarantees reliable reset assertion before most +3V microprocessors enter undefined operating regions. The threshold applies to VCC falling conditions and includes 20mV hysteresis to prevent chatter near the trip point. MAX706PCSA+ does not support adjustable reset thresholds.
Does MAX706PCSA+ provide an active-high or active-low reset output?
MAX706PCSA+ provides an active-high RESET output (pin 7), distinguishing it from MAX706RCSA+ (active-low) and MAX708RCSA+ (dual active-high/low). Its RESET pin is push-pull, capable of sourcing 500µA at VCC = 3.0V and sinking 1.2mA at VCC = 3.0V. This eliminates external level-shifting components when interfacing with µPs that require high-true reset signals.
Can the watchdog timer in MAX706PCSA+ be disabled?
No - the watchdog timer in MAX706PCSA+ cannot be disabled. Unlike the MAX706AP/AR/AS/AT series, the MAX706P/R/S/T family (including MAX706PCSA+) requires continuous WDI toggling every 1.6s ±40%. Leaving WDI open or floating will cause WDO to assert after timeout. To disable watchdog functionality, a different part such as MAX708RCSA+ (no watchdog) or MAX706APCSA+ (WDI high-Z disable) must be selected.
What is the function of the PFI and PFO pins on MAX706PCSA+?
On MAX706PCSA+, PFI (pin 4) is the input to a comparator referenced to an internal 1.25V bandgap; when PFI voltage falls below 1.25V, PFO (pin 5) - an open-drain output - pulls low. This enables monitoring of auxiliary supplies (e.g., +12V, -5V, or battery voltage) using an external resistive divider. PFO can trigger µP interrupts or cascade into MR for power-fail-initiated reset, extending system-level fault response beyond VCC supervision.
Is MAX706PCSA+ compatible with 5V logic systems?
Yes - MAX706PCSA+ operates with VCC from 2.7V to 5.5V and features TTL/CMOS-compatible inputs (MR, WDI) and outputs (RESET, WDO, PFO) across this range. At VCC = 5V, RESET can source 800µA (VOH = VCC – 1.5V) and sink 3.2mA (VOL = 0.4V); MR accepts VIH ≥ 2.0V and VIL ≤ 0.8V. No level shifters are needed for direct interface with 5V µPs or FPGAs.
MAX706PCSA+ 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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX706PCSA+ FAQ
1.How can I place an order for MAX706PCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706PCSA+ 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 MAX706PCSA+ reliable?
The price and inventory of MAX706PCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706PCSA+ is usually 5 days.
3.What payment methods are accepted for MAX706PCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706PCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706PCSA+?
MAX706PCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706PCSA+ 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 MAX706PCSA+?
For technical support, including MAX706PCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706PCSA+ requirements.
6.How does Aetrix verify that MAX706PCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX706PCSA+ 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 MAX706PCSA+ meets industry standards.
7.What is the process for return or replacement of MAX706PCSA+?
All MAX706PCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706PCSA+, 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 MAX706PCSA+ part is unused and in its original packaging.
Return procedure for MAX706PCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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