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Analog Devices Inc./Maxim Integrated MAX6725KAZWD3+
- Part No.:
- MAX6725KAZWD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725KAZWD3+.pdf
- Description:
- MAX6725 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:508
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Product details
Overview
MAX6725KAZWD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.62V threshold), VCC2 (2.313V threshold), and RSTIN (626.5mV reference) with 210ms reset timeout, watchdog timer, manual reset input, and power-fail monitor - used to ensure reliable boot and brownout recovery in multivoltage embedded systems.
For engineers reviewing the MAX6725KAZWD3+ datasheet, MAX6725KAZWD3+ pinout, MAX6725KAZWD3+ application, or MAX6725KAZWD3+ equivalent, key selection criteria include dual-supply monitoring with factory-trimmed thresholds, 210ms guaranteed reset hold time after supply recovery, integrated watchdog with 35s startup/1.12s normal mode, and compatibility with low-voltage core/I/O rails down to 0.8V operation.
Technical Context
The MAX6725KAZWD3+ implements independent voltage comparators for VCC1, VCC2, and RSTIN, each referenced to precision internal bandgap references (±1.5% typical threshold accuracy), with hysteresis of 0.5% of VTH and tempco of 20ppm/°C. Reset assertion is latched and held by an internal timeout counter that restarts on any threshold violation before expiry.
It integrates a dual-mode watchdog timer: a 35s minimum initial timeout after reset enables full system initialization, followed by a 1.12s minimum normal timeout triggered by the first WDI edge; the manual reset input (MR) features 50kΩ internal pullup and 1µs minimum pulse width support, while PFI/PFO provides independent power-fail detection with 2µs propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 1.620V (factory-trimmed, falling edge; ensures reset at precise 1.62V drop on primary supply) |
| VCC2 Threshold | 2.313V (factory-trimmed, falling edge; monitors secondary rail like 2.5V I/O or 3.3V interface) |
| RSTIN Reference | 626.5mV (internal precision reference; enables external resistor-divider for third-voltage monitoring down to 0.62V) |
| Reset Timeout | 210ms (minimum guaranteed duration; holds µP in reset long enough for stable power recovery) |
| Watchdog Period | 35s min startup / 1.12s min normal (dual-mode timing prevents false resets during boot, enables fast fault detection in runtime) |
| Supply Current | 14µA typical at 3.6V (ultra-low quiescent current extends battery life in portable equipment) |
| Operating Temp | -40°C to +85°C (industrial-grade temperature range supports deployment in telecom, industrial, and networking gear) |
Pinout & Package
MAX6725KAZWD3+ uses an 8-pin SOT23-8 package (3.0mm × 1.6mm × 1.1mm body, 0.65mm pitch), with exposed pad for thermal enhancement and lead-free RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST (active-low, open-drain) | Main reset output asserted when any monitored supply drops below threshold; requires external pullup for logic-high level |
| 2 | GND | Analog/digital ground reference for all comparators, timers, and I/O; must be low-impedance connection |
| 3 | MR (active-low manual reset) | Logic-low pulse forces reset regardless of supply status; internal 50kΩ pullup to VCC1 eliminates need for external resistor |
| 4 | PFO (active-low power-fail output) | Asserts low when PFI falls below 626.5mV; deasserts immediately without timeout - used for early warning interrupts |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal circuitry when > VCC1 and sets VCC2 comparator reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V); powers device when > VCC2 and sets VCC1 comparator reference |
| 7 | PFI | Power-fail input; high-impedance node connected to resistor divider to set custom power-fail trip point (e.g., battery low-warning) |
| 8 | RST2 (active-low, open-drain) | Dedicated second reset output driven by same logic as RST; enables independent reset control for auxiliary subsystems |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneous supervision of VCC1, VCC2, and RSTIN with independent thresholds - eliminates need for three discrete supervisors |
| Guaranteed reset validity down to 0.8V | Ensures correct reset state even during deep brownout conditions where VCC1 or VCC2 dips to 0.8V |
| Immunity to short VCC transients | Rejects glitches <20µs wide (at 100mV overdrive), preventing spurious resets in noisy power environments |
| Low supply current | 14µA typical ICC at 3.6V enables use in always-on battery-backed circuits without significant drain |
| Flexible reset output options | Two open-drain RST outputs (RST, RST2) allow independent pullup voltages - critical for mixed-voltage system reset coordination |
Applications
| Telecom Line Card Power Management | Industrial PLC CPU Module |
|---|---|
Use Scenario: Monitoring 3.3V backplane, 2.5V FPGA I/O, and 1.2V core supplies on a carrier-grade line card with hot-swap capability. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting coordinated reset across FPGA, DSP, and communication PHY upon any rail failure. Use Value: Prevents partial configuration or metastability by holding all logic in reset until all three rails stabilize post-hot-swap insertion. |
Use Scenario: Supervising 24V-to-5V DC/DC output, isolated 3.3V logic rail, and 1.8V microcontroller core in an IP67-rated programmable logic controller. IC Role / Device Role / Timing Role: Fault-detection hub triggering watchdog reset and logging power anomaly via PFO interrupt when 5V rail sags during motor surge. Use Value: Enables deterministic fail-safe shutdown and diagnostics without software intervention during transient overload events. |
| Portable Medical Monitor Battery Backup | Set-Top Box Multirail Sequencing |
Use Scenario: Managing Li-ion battery (3.0–4.2V), regulated 3.3V system rail, and 1.1V sensor ADC supply in a handheld ECG device with backup SRAM retention. IC Role / Device Role / Timing Role: Dual-threshold supervisor with RSTIN monitoring battery voltage via divider, initiating graceful save-and-shutdown before cutoff. Use Value: Extends usable battery life by 12% versus fixed-threshold solutions through accurate end-of-discharge detection. |
Use Scenario: Coordinating power-up sequence of 12V tuner, 5V demodulator, 3.3V SoC, and 1.2V DDR memory in a cable STB with strict voltage ramp requirements. IC Role / Device Role / Timing Role: Triple-monitor IC using VCC1/VCC2/RSTIN to verify proper sequencing order and assert reset if 3.3V rises before 5V. Use Value: Eliminates need for external sequencing ICs and reduces BOM count by consolidating three independent voltage checks into one device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KAZWD3+ | Push-pull RST output (vs. open-drain on MAX6725); identical thresholds, timeout, and feature set | Eliminates need for external pullup resistor on main reset line; better suited for µPs requiring active-high reset drive | Select MAX6726KAZWD3+ when driving push-pull-compatible processors or when board space prohibits adding pullup resistors |
| TPS3808G33DBVR | Dual-voltage only (VDD1/VDD2), no RSTIN or PFI; 3.3V fixed VDD1 threshold, 200ms timeout, no watchdog | Lacks third-voltage monitoring and power-fail alerting; suitable only for simpler two-rail systems without watchdog requirement | Choose TPS3808G33DBVR for cost-sensitive dual-supply applications where RSTIN/PFI functionality is unnecessary |
Compared with MAX6725KAZWD3+, MAX6726KAZWD3+ offers direct push-pull drive eliminating external components, while TPS3808G33DBVR reduces complexity and cost but sacrifices triple-monitoring, watchdog, and power-fail capabilities required for robust multivoltage systems.
Availability
MAX6725KAZWD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX6725KAZWD3+ 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, with leadership in supervisory, PMIC, and data-converter technologies.
The MAX6715–MAX6729 family was engineered specifically for multivoltage embedded systems needing compact, ultra-low-power supervision of primary, secondary, and auxiliary rails - targeting space-constrained, battery-aware, and industrial-grade platforms.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6725KAZWD3+?
The MAX6725KAZWD3+ has a factory-trimmed VCC1 reset threshold of 1.620V (typical), with guaranteed range 1.575V to 1.665V at +25°C and ±1.5% tolerance over -40°C to +85°C. This value is encoded in the 'Z' suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies strictly to the VCC1 pin.
Does MAX6725KAZWD3+ support monitoring a negative supply voltage?
Yes - MAX6725KAZWD3+ can monitor negative supplies using the PFI input with an external resistor network as shown in Figure 3b of the datasheet. When the negative rail drops, PFO asserts low; accuracy depends on PFI threshold tolerance (±1.5%), resistor matching, and VCC stability.
How does the watchdog timer behave after power-up on MAX6725KAZWD3+?
Upon power-up or reset, MAX6725KAZWD3+ enters a 35s minimum initial watchdog period. The 1.12s normal timeout begins only after the first valid WDI edge occurs before the 35s window expires - ensuring safe boot time for complex firmware initialization.
Can both RST and RST2 outputs on MAX6725KAZWD3+ be used simultaneously?
Yes - RST (pin 1) and RST2 (pin 8) are independently routed open-drain outputs driven by identical internal logic. They may be pulled up to different voltages (e.g., RST to 3.3V for MCU, RST2 to 5V for peripheral ASIC), enabling clean reset coordination across mixed-voltage domains.
What is the minimum pulse width required on MR to trigger reset on MAX6725KAZWD3+?
The MAX6725KAZWD3+ requires a minimum MR pulse width of 1µs to reliably assert reset. The input features 100ns glitch rejection and internal 50kΩ pullup to VCC1, allowing direct connection to momentary switches without external debounce components.
MAX6725KAZWD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.665V, 2.313V, Adj
- Output:
- Open Drain, Open Drain
- 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:
- SOT-23-8
MAX6725KAZWD3+ FAQ
1.How can I place an order for MAX6725KAZWD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KAZWD3+ 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 MAX6725KAZWD3+ reliable?
The price and inventory of MAX6725KAZWD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KAZWD3+ is usually 5 days.
3.What payment methods are accepted for MAX6725KAZWD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KAZWD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KAZWD3+?
MAX6725KAZWD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KAZWD3+ 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 MAX6725KAZWD3+?
For technical support, including MAX6725KAZWD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KAZWD3+ requirements.
6.How does Aetrix verify that MAX6725KAZWD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6725KAZWD3+ 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 MAX6725KAZWD3+ meets industry standards.
7.What is the process for return or replacement of MAX6725KAZWD3+?
All MAX6725KAZWD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KAZWD3+, 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 MAX6725KAZWD3+ part is unused and in its original packaging.
Return procedure for MAX6725KAZWD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6725KAZWD3+ Tags
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MIC826SYMT-TR
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APX803S-31SA-7
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APX803L20-29SA-7
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