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Analog Devices Inc./Maxim Integrated MAX6735AKALTD3+
- Part No.:
- MAX6735AKALTD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKALTD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6735AKALTD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +4.625V (VCC1), +3.075V (VCC2), and an adjustable input down to +0.63V via RSTIN. It features push-pull RESET and WDO outputs, 210ms reset timeout (D3), and operates across –40°C to +125°C. Used in multivoltage telecom and industrial systems to ensure reliable power-on reset and processor lockup recovery.
For engineers reviewing the MAX6735AKALTD3+ datasheet, MAX6735AKALTD3+ pinout, MAX6735AKALTD3+ application, or MAX6735AKALTD3+ equivalent, this page delivers verified electrical parameters, factory-set thresholds, watchdog timing behavior, SOT23-8 package layout, and real-world substitution guidance - all confirmed against Maxim's official documentation and ordering data.
Technical Context
The MAX6735AKALTD3+ implements a dual-mode watchdog timer: a 35s minimum startup delay after reset enables full system initialization, followed by a 1.12s minimum normal-mode timeout for rapid fault detection. Its triple-monitor architecture uses dedicated comparators for VCC1, VCC2, and RSTIN - the latter referenced to a stable 626mV internal threshold with ±3mV hysteresis and <100nA input current.
Reset assertion is guaranteed down to VCC1 or VCC2 = +0.8V, and the push-pull RST/WDO outputs drive high to 0.8×VCC1 at 500µA, low to ≤0.4V at 3.2mA. Immunity to short VCC transients is ensured by ≥100ns glitch rejection and validated transient duration vs. overdrive curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V nominal (LT suffix), ±125mV tolerance - sets primary supply brownout detection level for +5V rail monitoring |
| VCC2 Reset Threshold | +3.075V nominal (LT suffix), ±75mV tolerance - configures secondary supply monitoring for +3.3V logic rails |
| RSTIN Threshold | +626.5mV typical, ±15.5mV - enables precise third-rail monitoring (e.g., +1.2V core) via external resistor divider |
| Reset Timeout Period | 210ms nominal (D3 suffix), 140–280ms range - determines minimum reset pulse width for safe µP initialization |
| Watchdog Timeout | 1.12s min normal mode, 35s min startup mode - prevents false resets during boot while enabling fast lockup detection in runtime |
| Supply Current | 14µA typical at +3.6V - enables always-on supervision in battery-critical portable equipment without significant drain |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom base station environments |
Pinout & Package
MAX6735AKALTD3+ is housed in an 8-pin SOT23-8 package (K8S-3), measuring 3.00mm × 1.75mm × 1.30mm with gull-wing leads and JEDEC MO178 BA compliance. Pin 1 identified by dot; lead finish is lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver asserts low when VCC1/VCC2/RSTIN drop below threshold or MR is pulled low; drives high to 0.8×VCC1 |
| 2 - GND | Ground reference | Common return for all internal comparators, watchdog logic, and I/O; must be low-impedance for noise immunity |
| 3 - VCC2 | Secondary supply input | Power source and monitored voltage for second rail; supplies comparator bias when VCC2 > VCC1 |
| 4 - WDO | Active-low watchdog output | Push-pull output asserts low on WDI timeout or undervoltage; deasserts immediately when valid edge detected |
| 5 - VCC1 | Primary supply input | Main power and monitored voltage for first rail; powers internal circuitry when VCC1 > VCC2 |
| 6 - RSTIN | Adjustable reset comparator input | High-impedance (±100nA) node referenced to 626mV; accepts divided-down voltages up to VCC1 |
| 7 - WDI | Watchdog input | Edge-sensitive input; rising/falling transitions clear watchdog timer; floating state does not disable function |
| 8 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces reset when driven low; supports momentary switch interface |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous tracking of VCC1 (+4.625V), VCC2 (+3.075V), and RSTIN (adjustable down to +0.63V) eliminates need for discrete supervisors |
| Dual-mode watchdog | 35s startup delay allows full firmware boot before watchdog enforcement begins; 1.12s runtime timeout ensures prompt lockup response |
| Push-pull RST/WDO outputs | No external pullup required; drives high to 0.8×VCC1 at 500µA and low to ≤0.4V at 3.2mA - simplifies interface with bidirectional µP reset pins |
| Manual reset with glitch rejection | 1µs minimum MR pulse width and 100ns glitch filter prevent spurious resets from noisy switch inputs or EMI |
| Low-power operation | 14µA typical ICC at +3.6V enables integration into always-on subsystems without compromising battery life |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitoring +48V DC/DC converter output, +3.3V control logic, and +1.2V FPGA core in a remote radio unit. IC Role / Device Role / Timing Role: MAX6735AKALTD3+ asserts RST until all three rails stabilize, then maintains reset for 210ms to guarantee FPGA configuration completion before releasing µP. Use Value: Prevents partial initialization crashes by enforcing strict sequencing and timeout-based release - no external RC timing components needed. |
Use Scenario: Supervising +24V field power, +5V analog front-end, and +3.3V ARM Cortex-M7 core in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: MAX6735AKALTD3+ monitors each rail independently; its 125°C rating ensures reliability in enclosed cabinets; MR pin enables field-service reset via front-panel button. Use Value: Guarantees valid reset down to VCC = +0.8V, eliminating risk of brownout-induced undefined states during line sags. |
| Server Management Controller | Battery-Powered Edge Gateway |
|
Use Scenario: Ensuring clean boot of BMC (Baseboard Management Controller) across +12V, +3.3V, and +1.8V rails in a 1U server blade. IC Role / Device Role / Timing Role: MAX6735AKALTD3+ uses RSTIN to monitor +1.8V memory rail via resistor divider; WDO connects to BMC's watchdog input to trigger hardware reset on firmware hang. Use Value: Independent WDO output enables fail-safe recovery without software intervention - critical for unattended datacenter operation. |
Use Scenario: Supervising +3.6V Li-ion battery, +2.8V RF transceiver, and +1.2V sensor hub in a wireless IoT gateway operating 10+ years on primary cell. IC Role / Device Role / Timing Role: MAX6735AKALTD3+ draws only 14µA typical; its adjustable RSTIN input monitors battery voltage decay; MR supports user-initiated firmware update reset. Use Value: Extends battery life by minimizing quiescent current while maintaining full triple-rail supervision and watchdog coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKALTD3+ | Same pinout and thresholds, but open-drain RST/WDO outputs requiring external pullups | Suitable where level-shifting or wired-OR reset buses are used; incompatible with direct push-pull µP reset pins without series resistor | Select when interfacing with legacy µPs requiring open-drain reset arbitration or multi-source reset lines |
| TPS3808G33DBVR | Dual-voltage monitor only (no RSTIN), fixed 3.3V VDD threshold, 200ms timeout, 2.5µA IQ | Lacks third-rail monitoring and manual reset; optimized for ultra-low-power single-rail apps | Choose only if monitoring only two rails and lowest possible supply current is mandatory - sacrifices flexibility and feature set |
Compared with MAX6734AKALTD3+, the MAX6735AKALTD3+ provides push-pull outputs for direct µP interface and eliminates external pullup components; versus TPS3808G33DBVR, it adds critical third-rail supervision and MR functionality essential for complex embedded systems.
Availability
MAX6735AKALTD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and server management applications requiring stable component supply, extended temperature support, and long-term lifecycle assurance.
Supply support for MAX6735AKALTD3+ 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, automotive, and communications applications.
The MAX6730A–MAX6735A family was engineered specifically for multivoltage µP systems needing simultaneous rail monitoring, configurable reset timing, and robust watchdog protection - targeting high-reliability embedded control and infrastructure equipment.
FAQ
What reset timeout period is implemented in MAX6735AKALTD3+?
The MAX6735AKALTD3+ uses the D3 reset timeout suffix, providing a nominal 210ms reset pulse width (range: 140ms to 280ms). This duration ensures sufficient time for microprocessor and peripheral initialization after power-up or brownout recovery, and is factory-trimmed - no external components required to set or adjust it.
Does MAX6735AKALTD3+ support monitoring a third voltage rail?
Yes, MAX6735AKALTD3+ includes an RSTIN pin with a precise 626.5mV internal reference threshold, enabling monitoring of a third voltage rail (e.g., +1.2V core) via an external resistor divider. This capability distinguishes it from dual-rail variants like MAX6732A/MAX6733A and eliminates the need for a second supervisor IC.
What is the function of the MR pin on MAX6735AKALTD3+?
The MR (Manual Reset) pin on MAX6735AKALTD3+ is an active-low input with a 50kΩ internal pullup resistor. Driving MR low forces an immediate reset assertion on RST for the full timeout period, regardless of supply voltages. It supports momentary switch interfaces and is essential for field service, test modes, and firmware update sequences.
How does the watchdog timer operate in MAX6735AKALTD3+?
MAX6735AKALTD3+ features a dual-mode watchdog: a 35s minimum startup delay after reset allows full system boot, then transitions to a 1.12s minimum normal timeout. WDI edge detection clears the timer; absence of edges within timeout asserts WDO low. The independent WDO output enables hardware-level recovery without software involvement.
Is MAX6735AKALTD3+ compatible with bidirectional µP reset pins?
Yes - MAX6735AKALTD3+ uses push-pull RST and WDO outputs, which safely interface with bidirectional µP reset I/O ports. Unlike open-drain variants, it avoids logic contention; a 10kΩ series resistor is recommended only if the µP actively drives the line during reset release to prevent bus conflicts.
MAX6735AKALTD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.075V, 4.625V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735AKALTD3+ FAQ
1.How can I place an order for MAX6735AKALTD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKALTD3+ 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 MAX6735AKALTD3+ reliable?
The price and inventory of MAX6735AKALTD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKALTD3+ is usually 5 days.
3.What payment methods are accepted for MAX6735AKALTD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKALTD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKALTD3+?
MAX6735AKALTD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKALTD3+ 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 MAX6735AKALTD3+?
For technical support, including MAX6735AKALTD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKALTD3+ requirements.
6.How does Aetrix verify that MAX6735AKALTD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6735AKALTD3+ 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 MAX6735AKALTD3+ meets industry standards.
7.What is the process for return or replacement of MAX6735AKALTD3+?
All MAX6735AKALTD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKALTD3+, 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 MAX6735AKALTD3+ part is unused and in its original packaging.
Return procedure for MAX6735AKALTD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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