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Analog Devices Inc./Maxim Integrated MAX6703LKA
- Part No.:
- MAX6703LKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6703LKA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
MAX6703LKA from Maxim Integrated is a low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, providing active-low open-drain reset output, manual reset input, watchdog timer with independent WDO output, and power-fail monitoring via PFI/PFO. It monitors a single supply voltage (4.63V nominal threshold), asserts reset during power-up/down/brownout, and supports systems requiring reliable µP reset control with early power-fail warning. Used in industrial controllers and embedded instrumentation.
For engineers reviewing the MAX6703LKA datasheet, MAX6703LKA pinout, MAX6703LKA application, or MAX6703LKA equivalent, this page delivers verified functional identity, confirmed SOT23-8 pin mapping, exact reset timeout (140ms), watchdog period (1.6s), and precise VTH (4.63V) - all validated against Maxim's official datasheet Rev 3 (12/05).
Technical Context
The MAX6703LKA implements a dual-comparator architecture: one fixed-threshold monitor for VCC (4.63V) and a separate 0.62V reference-based comparator for PFI, enabling independent power-fail detection. Its watchdog timer resets on WDI edge transitions and times out after 1.6s if no toggle occurs, asserting WDO independently of RESET.
Reset assertion is guaranteed down to VCC = 1V; the open-drain RESET output sinks ≥50µA at VOL ≤0.4V (VCC ≥4.25V), while WDO provides identical open-drain drive capability. MR features internal 50kΩ pullup and 100ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (fixed, L-suffix), ±3% over -40°C to +125°C - sets precise brownout detection point for +5V systems |
| Reset Timeout Period | 140ms (typ), 120–300ms range - ensures µP remains held in reset long enough for stable power rail recovery |
| Watchdog Timeout | 1.6s (typ), 1.12–2.4s range - provides robust software activity monitoring without false triggers |
| Power-Fail Threshold | 0.62V (typ), 6mV hysteresis - enables accurate early-warning detection of secondary supply collapse |
| Supply Voltage Range | 1.2V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| RESET Output Type | Active-low open drain - allows wired-OR configuration and level-shifting across voltage domains |
| Quiescent Current | 9–20µA (VCC < 3.6V) - minimizes impact on battery-backed or low-power systems |
Pinout & Package
Package: 8-pin SOT23-8 (JEDEC MO-178 BA), 3.00mm × 1.75mm body, 0.65mm pitch, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | CMOS-compatible active-low input with 50kΩ internal pullup; forces reset when pulled low, rejects <100ns glitches |
| 2 VCC | Supply Voltage Input | Primary power rail input (1.2–5.5V); powers internal comparators and drives push-pull outputs (not used here) |
| 3 GND | Ground Reference | System ground return for all internal circuits and output sink paths |
| 4 PFI | Power-Fail Input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; accepts external resistive divider for custom trip points |
| 5 PFO | Power-Fail Output | Active-low open-drain output asserted when PFI < 0.62V; sinks ≥50µA at VOL ≤0.4V |
| 6 WDI | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents WDO assertion; detects pulses ≥50ns wide |
| 7 RESET | Reset Output | Active-low open-drain output; asserted during VCC brownout, MR low, or watchdog timeout; holds low for 140ms after fault clears |
| 8 WDO | Watchdog Output | Independent active-low open-drain output; asserted only on watchdog timeout (not on VCC brownout), deasserted by WDI edge or MR low |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.63V reset threshold | Enables direct supervision of +5V rails without external resistor networks, reducing BOM count and layout area |
| Independent watchdog output (WDO) | Allows NMI-triggered error handling separate from system reset, supporting fail-safe diagnostics without disrupting µP state |
| 0.62V precision power-fail comparator | Supports early warning of secondary supply collapse (e.g., I/O or analog rails) with minimal external components |
| Open-drain RESET and WDO outputs | Permits flexible interface to diverse logic families and voltage domains via external pullup resistors |
| Guaranteed operation down to VCC = 1V | Ensures valid reset assertion through deep undervoltage events, critical for automotive and industrial brownout resilience |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring main 5V supply and auxiliary 3.3V I/O rail in programmable logic controller cabinets exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: MAX6703LKA provides primary reset generation for ARM Cortex-M7 MCU and independent PFO interrupt to initiate graceful shutdown of fieldbus interfaces before power loss. Use Value: 4.63V threshold matches nominal 5V rail tolerance; 140ms reset timeout exceeds µP minimum requirement; 0.62V PFI reference enables accurate 3.3V rail monitoring with <1% error using standard 1% resistors. | Use Scenario: Supervising 5V domain powering CAN transceivers and sensor signal conditioning in vehicle door modules. IC Role / Device Role / Timing Role: MAX6703LKA asserts RESET during ignition-on power ramp and monitors battery-derived 5V rail for brownout; WDO feeds NMI to detect firmware hangs during sleep/wake transitions. Use Value: Guaranteed reset validity to VCC = 1V ensures reliable operation during cold-crank events; open-drain outputs interface directly to 3.3V CAN PHY logic without level shifters. |
| Medical Infusion Pump | Network Edge Router |
Use Scenario: Ensuring deterministic startup and fault response in battery-powered infusion pumps where power integrity directly impacts patient safety. IC Role / Device Role / Timing Role: MAX6703LKA generates reset for safety-critical ARM-based controller and uses PFI to monitor backup coin-cell voltage, triggering PFO interrupt to log low-battery event before shutdown. Use Value: 9–20µA quiescent current extends battery life; 100ns MR glitch rejection prevents spurious resets from motor commutation noise; 0.62V PFI threshold enables precise 3V coin-cell monitoring. | Use Scenario: Supervising 5V supply to FPGA-based packet processing engine and 3.3V supply to Ethernet PHY in compact enterprise switches. IC Role / Device Role / Timing Role: MAX6703LKA provides primary reset for FPGA configuration and uses WDI/WDO to detect firmware lockups in management CPU, initiating controlled reboot without affecting data plane. Use Value: Independent WDO output enables watchdog-driven NMI without resetting FPGA fabric; 1.6s timeout balances responsiveness and immunity to transient software stalls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6703TKA | 3.08V reset threshold (T-suffix), same pinout and features | Designed for +3.3V systems instead of +5V; requires revalidation of power-rail margin | Select when supervising 3.3V supplies; verify brownout headroom against actual rail tolerance and load step response. |
| MAX6326UR29D3+ | 2.93V threshold, SOT23-5 package, no PFI/PFO or watchdog | Basic reset-only function; lacks power-fail warning and watchdog independence | Choose only for cost-sensitive, space-constrained designs where PFI and WDO are unnecessary and 3.3V rail supervision suffices. |
Compared with MAX6703TKA and MAX6326UR29D3+, the MAX6703LKA uniquely combines 4.63V precision reset, full watchdog independence, and dedicated power-fail monitoring in a standard SOT23-8 footprint - making it optimal for +5V µP systems requiring comprehensive fault coverage.
Availability
MAX6703LKA is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, and medical infusion devices requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6703LKA 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 demanding industrial, automotive, and medical applications.
The MAX6701–MAX6708 family targets µP-based systems needing integrated reset, watchdog, and power-fail monitoring in minimal board space - specifically optimized for reliability-critical embedded control.
FAQ
What is the exact reset threshold voltage for MAX6703LKA?
The MAX6703LKA has a fixed reset threshold of 4.63V (L-suffix), specified with ±3% tolerance over -40°C to +125°C. This value is factory-trimmed and guaranteed per Maxim's datasheet Rev 3. The MAX6703LKA uses this threshold to monitor VCC and assert RESET when the supply falls below this level during power-down or brownout events.
Does MAX6703LKA provide independent watchdog output functionality?
Yes, the MAX6703LKA provides an independent active-low open-drain watchdog output (WDO) that asserts only upon watchdog timeout (1.6s), not during VCC brownout. WDO deasserts on a valid WDI edge or when MR is pulled low. This separation allows the MAX6703LKA to support NMI-based error handling without interfering with the primary reset sequence.
What is the function of the PFI and PFO pins on MAX6703LKA?
The PFI pin on MAX6703LKA is a high-impedance input referenced to an internal 0.62V comparator, used to monitor secondary voltages (e.g., 3.3V or 2.5V rails) via an external resistor divider. The PFO pin is its corresponding active-low open-drain output, asserted when PFI falls below 0.62V. This enables early power-fail warning and orderly shutdown initiation in the MAX6703LKA.
What package type and pin count does MAX6703LKA use?
The MAX6703LKA uses an 8-pin SOT23-8 package (JEDEC MO-178 BA), measuring 3.00mm × 1.75mm with 0.65mm lead pitch. Pinout is fully documented in Maxim's datasheet: MR (1), VCC (2), GND (3), PFI (4), PFO (5), WDI (6), RESET (7), WDO (8). Lead-free versions are ordered with "+T" suffix.
How does the manual reset (MR) input behave on MAX6703LKA?
The MR input on MAX6703LKA is an active-low CMOS-compatible pin with internal 50kΩ pullup to VCC. Pulling MR low forces RESET assertion for the full 140ms timeout period, even if VCC remains stable. It rejects glitches <100ns and can be driven by pushbuttons or logic signals. MR also deasserts WDO in the MAX6703LKA, enabling synchronized watchdog reset control.
MAX6703LKA 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:
- 4.63V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6703LKA FAQ
1.How can I place an order for MAX6703LKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6703LKA 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 MAX6703LKA reliable?
The price and inventory of MAX6703LKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6703LKA is usually 5 days.
3.What payment methods are accepted for MAX6703LKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6703LKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6703LKA?
MAX6703LKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6703LKA 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 MAX6703LKA?
For technical support, including MAX6703LKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6703LKA requirements.
6.How does Aetrix verify that MAX6703LKA is sourced from the original manufacturer or authorized distributors?
All MAX6703LKA 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 MAX6703LKA meets industry standards.
7.What is the process for return or replacement of MAX6703LKA?
All MAX6703LKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6703LKA, 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 MAX6703LKA part is unused and in its original packaging.
Return procedure for MAX6703LKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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