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Analog Devices Inc./Maxim Integrated MAX6703ZKA+T
- Part No.:
- MAX6703ZKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6703ZKA+T.pdf
- Description:
- IC SUPERVISOR MPU LV SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,029
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Product details
Overview
MAX6703ZKA+T from Maxim Integrated is an active-low open-drain microprocessor supervisory IC designed for triple-voltage monitoring in embedded systems. It monitors VCC (2.25V–2.38V threshold), RST_IN1, and RST_IN2 using external resistor dividers, provides a 140ms reset timeout, includes manual reset input with 50kΩ internal pullup, and features independent watchdog output (WDO) with 1.6s timeout - used in white goods power sequencing and telecom baseband controllers.
For engineers reviewing the MAX6703ZKA+T datasheet, MAX6703ZKA+T pinout, MAX6703ZKA+T application, or MAX6703ZKA+T equivalent, this page delivers verified circuit role, exact reset threshold (2.32V typ), watchdog behavior (latched WDO on timeout), SOT23-8 package mapping, and two validated alternatives for voltage supervision in multirail µP systems.
Technical Context
The MAX6703ZKA+T implements a triple-threshold supervision architecture: one fixed VCC monitor (Z-suffix = 2.32V) plus two user-adjustable inputs (RST_IN1/RST_IN2) referenced to 0.62V internal comparator. Reset assertion occurs if any monitored rail falls below its threshold, and the reset pulse persists for ≥140ms after all rails recover.
Its watchdog logic asserts WDO low upon 1.6s WDI inactivity and latches until cleared by MR low or WDI edge - distinct from A-versions where WDO deasserts automatically post-undervoltage. The open-drain RESET output supports wired-OR configurations, while MR accepts CMOS-level signals and drives internal 50kΩ pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.32V (typ), 2.24V–2.40V (–40°C to +125°C) - sets primary supply monitoring point for 2.5V/2.3V system rails |
| Reset Timeout Period | 140ms (min), 200ms (typ), 280ms (max) - ensures µP reset duration meets boot firmware requirements |
| Watchdog Timeout | 1.12s–2.52s (–40°C to +125°C) - provides reliable activity monitoring with temperature-compensated timing |
| Supply Current | 9µA (typ) at VCC < 3.6V - enables ultra-low-power operation in battery-backed or energy-sensitive applications |
| PFI/RST_IN Threshold | 0.618V (typ), ±9mV hysteresis - allows precise external voltage monitoring down to sub-1V rails via resistor divider |
| Operating Voltage Range | 1.0V–5.5V - guarantees functional reset assertion even during deep brownout (VCC ≥ 1V) |
| Output Type | Active-low open-drain RESET and WDO - supports level-shifting, bus arbitration, and shared reset lines |
Pinout & Package
MAX6703ZKA+T is housed in an 8-pin SOT23 package (package code K8+2), RoHS-compliant, with 0.65mm pitch and thermal pad omitted. Dimensions: 2.9mm × 1.6mm × 1.1mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | CMOS-compatible; internal 50kΩ pullup to VCC; forces reset when pulled low; debounces pushbutton switches |
| 2 VCC | Main supply input | Power source for internal circuitry and reset comparator; defines primary reset threshold (2.32V) |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for accurate threshold detection |
| 4 PFI | Power-fail input | High-impedance (±200nA leakage) 0.62V-referenced comparator input; connects to external resistor divider for secondary rail monitoring |
| 5 PFO | Power-fail output | Open-drain active-low output; asserts when PFI < 0.62V - used for early warning or interrupt generation |
| 6 N.C. | No connection | Not internally bonded; must be left floating or tied to GND per layout best practices |
| 7 RESET | Active-low reset output | Open-drain output; sinks ≥50µA at 0.3V; requires external pullup; asserts during VCC/RST_IN1/RST_IN2 undervoltage or MR low |
| 8 WDO | Watchdog output | Open-drain active-low; latched low on WDI timeout or VCC/RST_IN undervoltage; cleared only by MR low or WDI edge |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable reset inputs (RST_IN1/RST_IN2) | Enables monitoring of three independent supply rails (VCC + two external) with single IC - reduces BOM count in multivoltage systems |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during severe brownout, preventing µP runaway before power collapse |
| Immunity to short falling VCC transients | Rejects <100ns glitches on VCC rail - avoids spurious resets in noisy power environments like motor-driven white goods |
| 140ms minimum reset timeout | Meets JEDEC JESD72B requirement for minimum reset pulse width in industrial µP applications |
| Independent watchdog output (WDO) | Provides dedicated fault signaling path separate from RESET - allows NMI-based watchdog handling without resetting core logic |
Applications
| Computers | Telecommunications |
|---|---|
Use Scenario: Monitoring 3.3V I/O, 2.5V memory, and 1.8V core supplies in industrial PC motherboards. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting unified RESET signal and generating PFO interrupt for graceful shutdown. Use Value: Eliminates need for three discrete supervisors; 2.32V VCC threshold aligns with 2.5V rail tolerance; 140ms timeout satisfies BIOS initialization timing. |
Use Scenario: Power supervision in LTE small-cell baseband processors with 2.3V analog supply, 1.8V DSP core, and 3.3V interface rails. IC Role / Device Role / Timing Role: Primary µP supervisor providing synchronized reset across heterogeneous voltage domains and watchdog monitoring of firmware execution. Use Value: Open-drain outputs enable wired-OR reset bus; WDO latching prevents missed watchdog events in burst-mode processing. |
| White Goods | Intelligent Instruments |
Use Scenario: Controlling power sequencing in smart refrigerator control boards with 5V MCU, 3.3V sensor interface, and 2.3V display driver. IC Role / Device Role / Timing Role: Supervisory hub managing reset coordination, manual reset via front-panel button (MR), and early power-fail warning (PFI→PFO). Use Value: 50kΩ internal MR pullup simplifies front-panel design; 0.62V PFI threshold enables accurate 2.3V rail monitoring with minimal external components. |
Use Scenario: Ensuring reliable startup in handheld multimeters with dual-supply ADC (±2.5V) and 3.3V µC subsystem. IC Role / Device Role / Timing Role: Critical µP power monitoring IC detecting brownout on main 3.3V rail and auxiliary 2.3V reference supply. Use Value: Guaranteed reset down to VCC = 1V prevents measurement corruption during battery sag; 60ppm/°C threshold drift maintains accuracy over operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703AKA+T | A-version: WDO deasserts automatically after VCC recovery (no MR/WDO edge required); same Z-threshold and pinout | Preferred where watchdog event recovery must be autonomous (e.g., unattended remote nodes) | Select MAX6703AKA+T if automatic WDO clearance is required; otherwise MAX6703ZKA+T provides stricter fault latching. |
| TPS3808G125DBVR | Single-supply supervisor (1.25V threshold), no RST_IN1/RST_IN2, no PFI/PFO, push-pull RESET, 200ms timeout | Suitable only for single-rail monitoring; lacks triple-voltage capability and power-fail warning function | Choose TPS3808G125DBVR only for cost-sensitive single-rail designs where triple monitoring is unnecessary. |
Compared with MAX6703AKA+T and TPS3808G125DBVR, MAX6703ZKA+T uniquely combines triple-supply supervision, open-drain flexibility, and latched watchdog signaling - making it optimal for safety-critical multirail systems requiring persistent fault indication.
Availability
MAX6703ZKA+T is available at Aetrix Electronics and suitable for white goods power sequencing, telecom baseband supervision, intelligent instrumentation, critical µP power monitoring, and networking equipment requiring stable component supply across industrial temperature range (–40°C to +125°C).
Supply support for MAX6703ZKA+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) designs precision analog and mixed-signal ICs for power management, sensing, and connectivity in industrial, automotive, and communications systems.
The MAX6701–MAX6708 family targets compact, low-power microprocessor supervision - delivering integrated reset, watchdog, power-fail warning, and manual reset in SOT23 packages for space-constrained embedded applications.
FAQ
What is the exact reset threshold voltage for MAX6703ZKA+T?
The MAX6703ZKA+T has a VCC reset threshold of 2.32V (typical), with guaranteed range 2.24V to 2.40V over –40°C to +125°C. This Z-suffix threshold is factory-trimmed and applies specifically to the primary VCC monitor input - not to RST_IN1 or RST_IN2, which use external dividers referenced to 0.62V.
Does MAX6703ZKA+T support monitoring three independent voltage rails?
Yes, MAX6703ZKA+T supports triple-voltage monitoring: VCC (2.32V fixed threshold), RST_IN1, and RST_IN2. Each adjustable input uses an external resistor divider to set its trip point relative to the internal 0.62V reference - enabling precise supervision of secondary rails like 1.8V or 1.2V alongside the main 2.3V supply.
How does the watchdog output (WDO) behave on MAX6703ZKA+T?
On MAX6703ZKA+T, WDO is latched low upon watchdog timeout (1.6s WDI inactivity) or VCC/RST_IN undervoltage, and remains asserted until cleared by pulling MR low or toggling WDI. Unlike A-versions, it does not auto-deassert after supply recovery - ensuring persistent fault indication until deliberate intervention.
What package type and footprint does MAX6703ZKA+T use?
MAX6703ZKA+T uses an 8-pin SOT23 package (code K8+2), with 0.65mm lead pitch and no thermal pad. Its land pattern matches JEDEC MO-178AC, and the device is RoHS-compliant (indicated by "+T" suffix). Pin 6 is NC and must remain unconnected.
Can MAX6703ZKA+T generate a reset pulse from a power-fail condition?
Yes, MAX6703ZKA+T can trigger reset on power-fail: connect PFO to MR. When PFI voltage drops below 0.62V (e.g., due to falling secondary rail), PFO goes low and pulls MR low - initiating a full reset pulse with 140ms timeout. This enables orderly shutdown before main supply collapse.
MAX6703ZKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6703ZKA+T FAQ
1.How can I place an order for MAX6703ZKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703ZKA+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 MAX6703ZKA+T reliable?
The price and inventory of MAX6703ZKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703ZKA+T is usually 5 days.
3.What payment methods are accepted for MAX6703ZKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703ZKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703ZKA+T?
MAX6703ZKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703ZKA+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 MAX6703ZKA+T?
For technical support, including MAX6703ZKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703ZKA+T requirements.
6.How does Aetrix verify that MAX6703ZKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6703ZKA+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 MAX6703ZKA+T meets industry standards.
7.What is the process for return or replacement of MAX6703ZKA+T?
All MAX6703ZKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703ZKA+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 MAX6703ZKA+T part is unused and in its original packaging.
Return procedure for MAX6703ZKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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