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Analog Devices Inc./Maxim Integrated MAX6735AKALTD3+T
- Part No.:
- MAX6735AKALTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKALTD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:17,500
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Product details
Overview
MAX6735AKALTD3+T 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 (RSTIN), featuring 210ms reset timeout, push-pull RST/WDO outputs, and manual reset input - deployed in telecom power sequencing and multivoltage embedded controllers.
For engineers reviewing the MAX6735AKALTD3+T datasheet, MAX6735AKALTD3+T pinout, MAX6735AKALTD3+T application, or MAX6735AKALTD3+T equivalent, this page delivers verified electrical specs, temperature-stable threshold behavior (-40°C to +125°C), watchdog startup delay (35s min), supply current (14µA typ at +3.6V), and SOT23-8 package compatibility for industrial-grade system supervision.
Technical Context
The MAX6735AKALTD3+T implements dual-mode watchdog logic: a 35s minimum initial timeout after reset enables full system boot, followed by 1.12s minimum normal-mode timeout for rapid fault detection. Its triple-monitor architecture uses factory-set VCC1/VCC2 thresholds (LT suffix = 4.625V/3.075V) plus a precision 626mV internal reference for RSTIN, supporting external resistor-divider scaling.
Reset assertion is guaranteed valid down to VCC1 or VCC2 = +0.8V; the push-pull RST and WDO outputs drive loads directly without pullups, while MR features a 50kΩ internal pullup and 1µs minimum pulse width tolerance. Immunity to short VCC transients is confirmed via 75mV overdrive testing per typical characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V nominal (LT suffix), ±125mV tolerance - sets primary supply brownout detection point for +5V rail supervision |
| VCC2 Reset Threshold | +3.075V nominal (LT suffix), ±75mV tolerance - monitors secondary +3.3V domain with 0.5% hysteresis |
| RSTIN Threshold | +626.5mV typical, ±15.5mV - enables third-supply monitoring down to +0.63V via external divider |
| Reset Timeout Period | 210ms nominal (D3 suffix), 140–280ms range - ensures sufficient hold time for processor initialization |
| Watchdog Timeout | 35s min initial period, 1.12s min normal period - accommodates boot sequences then enforces runtime code flow |
| Supply Current | 14µA typical at +3.6V - enables battery-backed operation in portable equipment with minimal quiescent load |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive, industrial PLC, and telecom base station environments |
Pinout & Package
MAX6735AKALTD3+T is housed in an 8-pin SOT23-8 package (K8S-3), measuring 2.95mm × 1.60mm × 1.10mm, with gull-wing leads and JEDEC MO-178 compliant outline. Pin 1 marked by dot; lead finish is lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation; no external pullup required |
| 2 - GND | Ground reference | Common return for all internal comparators, watchdog timer, and I/O; must be low-impedance connection |
| 3 - VCC2 | Secondary supply input | Monitors +3.075V rail; powers internal circuitry when VCC2 > VCC1; supports operation down to +0.8V |
| 4 - MR | Active-low manual reset input | Drives reset when pulled low; 50kΩ internal pullup to VCC1; 100ns glitch rejection; 1µs minimum pulse width |
| 5 - WDI | Watchdog input | Edge-sensitive; clears watchdog timer on rising/falling transition; floating state does not disable watchdog |
| 6 - VCC1 | Primary supply input | Monitors +4.625V rail; powers device when VCC1 > VCC2; defines main reset timing reference |
| 7 - RSTIN | Adjustable reset comparator input | High-impedance (±100nA) node referenced to 626.5mV; used with resistor divider to monitor third voltage |
| 8 - WDO | Active-low watchdog output | Push-pull driver; asserts low on WDI timeout or VCC1/VCC2/RSTIN undervoltage; deasserts immediately on recovery |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneous supervision of VCC1 (+4.625V), VCC2 (+3.075V), and RSTIN (scalable to ≥+0.63V) eliminates need for three discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay prevents false timeout during boot; 1.12s runtime timeout ensures rapid lockup detection post-initialization |
| Push-pull RST and WDO outputs | Direct-drive capability removes external pullup resistors, reducing BOM count and PCB area in space-constrained designs |
| Guaranteed reset validity to +0.8V | Ensures clean reset assertion even during deep brownout conditions where VCC drops below 1.0V |
| Immunity to short VCC transients | Rejects glitches ≤75mV overdrive for durations up to 10µs (per typical curve), preventing spurious resets in noisy power domains |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Supervising +48V DC-DC converter outputs, +3.3V FPGA core, and +1.2V CPU I/O rails in a 4G/LTE base station card. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across power domains using LT-suffix thresholds and D3 timeout. Use Value: Eliminates discrete RC timers and voltage detectors, reducing component count by 60% while guaranteeing synchronized power-up sequence across three rails. |
Use Scenario: Monitoring +24V field bus supply, +5V logic rail, and +3.3V microcontroller core in an IP67-rated programmable logic controller. IC Role / Device Role / Timing Role: Fault-tolerant supervisor with -40°C to +125°C operation, MR input for emergency stop, and watchdog guarding firmware execution. Use Value: Enables certified functional safety compliance (IEC 61508 SIL2) via deterministic reset timing and validated watchdog response within 1.12s. |
| Portable Medical Monitor | Battery-Powered IoT Gateway |
|
Use Scenario: Managing Li-ion battery protection, +3.3V sensor interface, and +1.8V display controller in a handheld ECG device. IC Role / Device Role / Timing Role: Low-quiescent-current (14µA) supervisor with adjustable RSTIN monitoring battery voltage via divider, enabling accurate end-of-life detection. Use Value: Extends battery life by >12 months versus discrete solutions, while maintaining reliable brownout reset at 3.0V cutoff. |
Use Scenario: Supervising +5V USB-powered SoC, +3.3V RF module, and +1.2V memory rail in a LoRaWAN edge gateway operating on solar-charged batteries. IC Role / Device Role / Timing Role: Triple-supply monitor with MR input for OTA firmware recovery and watchdog guarding sleep/wake transitions. Use Value: Prevents silent firmware hangs during wireless stack reconnection by enforcing 1.12s watchdog timeout - critical for unattended remote deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKALTD3+T | Same pinout and thresholds, but open-drain RST/WDO outputs requiring external pullups | Suitable where level-shifting or wired-OR reset buses are needed; incompatible with direct-drive µP reset pins | Select when interfacing with legacy processors requiring open-drain reset signaling or shared reset busses |
| TPS3808G33DBVR | Dual-voltage monitor only (no RSTIN), fixed 3.3V/1.2V thresholds, no manual reset input, 200ms timeout | Lacks third-supply monitoring and MR functionality; lower supply current (4µA) but no adjustable input | Choose for cost-sensitive dual-rail systems without adjustable monitoring or manual reset requirements |
Compared with MAX6734AKALTD3+T, the MAX6735AKALTD3+T offers direct-drive reset capability and simplified layout; versus TPS3808G33DBVR, it adds critical RSTIN flexibility and MR support for field-recoverable embedded systems.
Availability
MAX6735AKALTD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, portable medical devices, and battery-powered IoT gateways requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6735AKALTD3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6730A–MAX6735A family was designed specifically for multivoltage microprocessor supervision in harsh environments, integrating triple monitoring, dual-mode watchdog, and manual reset into compact SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735AKALTD3+T?
The MAX6735AKALTD3+T uses the LT suffix, specifying a nominal VCC1 reset threshold of +4.625V (min +4.500V, max +4.750V) and a nominal VCC2 reset threshold of +3.075V (min +3.000V, max +3.150V), both with 0.5% hysteresis and 20ppm/°C tempco - confirmed in Table 1 and Electrical Characteristics sections of the datasheet.
Does the MAX6735AKALTD3+T support monitoring a third voltage below +0.63V?
No - the MAX6735AKALTD3+T's RSTIN input has a fixed 626.5mV internal reference; its minimum monitorable voltage is +0.63V (611mV min). Voltages below this cannot be reliably detected, as the comparator lacks sub-600mV reference capability. For lower thresholds, external amplification or alternative supervisors like MAX6369 must be considered.
How does the watchdog timer behave during power-up of the MAX6735AKALTD3+T?
Upon power-up or reset assertion, the MAX6735AKALTD3+T enters a 35s minimum initial watchdog mode (tWD-L), allowing full system boot before watchdog enforcement begins. After the first valid WDI edge or expiration of tWD-L, it switches to 1.12s minimum normal timeout (tWD-S), ensuring rapid fault detection during steady-state operation.
Can the manual reset input (MR) of the MAX6735AKALTD3+T be left floating?
No - the MR pin of the MAX6735AKALTD3+T has an internal 50kΩ pullup to VCC1, but leaving it floating risks noise-induced false resets. Maxim recommends connecting MR to VCC1 if unused, or using a normally-open momentary switch to GND for intentional reset. A 0.1µF capacitor to GND is advised for long-trace or noisy environments.
What is the maximum supply voltage the MAX6735AKALTD3+T can tolerate on VCC1 and VCC2?
The MAX6735AKALTD3+T supports VCC1 and VCC2 inputs from +0.8V to +5.5V per Absolute Maximum Ratings. Operation above +5.5V risks permanent damage; sustained operation at +5.5V is allowed only if all I/O connections are open and outputs are not asserted - design margins should target ≤+5.0V for reliability.
MAX6735AKALTD3+T 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+T FAQ
1.How can I place an order for MAX6735AKALTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKALTD3+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 MAX6735AKALTD3+T reliable?
The price and inventory of MAX6735AKALTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKALTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735AKALTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKALTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKALTD3+T?
MAX6735AKALTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKALTD3+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 MAX6735AKALTD3+T?
For technical support, including MAX6735AKALTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKALTD3+T requirements.
6.How does Aetrix verify that MAX6735AKALTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735AKALTD3+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 MAX6735AKALTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735AKALTD3+T?
All MAX6735AKALTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKALTD3+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 MAX6735AKALTD3+T part is unused and in its original packaging.
Return procedure for MAX6735AKALTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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