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Analog Devices Inc./Maxim Integrated MAX6735AKASHD3+
- Part No.:
- MAX6735AKASHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKASHD3+.pdf
- Description:
- MAX6735 TRIPLE-VOLTAGE MICROPROC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6735AKASHD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring two factory-set supply rails (VCC1 = +2.925V, VCC2 = +2.188V) and one adjustable input (RSTIN = 626mV threshold), featuring push-pull RESET and WDO outputs, 210ms reset timeout, and operation from -40°C to +125°C. It ensures system reliability in multivoltage embedded controllers requiring precise brownout detection and fail-safe watchdog supervision.
For engineers reviewing the MAX6735AKASHD3+ datasheet, MAX6735AKASHD3+ pinout, MAX6735AKASHD3+ application, or MAX6735AKASHD3+ equivalent, key selection criteria include its dual fixed-threshold + adjustable third-channel architecture, push-pull active-low reset and watchdog outputs, 14µA typical supply current, immunity to short VCC transients, and guaranteed reset validity down to VCC = +0.8V.
Technical Context
The MAX6735AKASHD3+ implements a triple-supply monitoring architecture: VCC1 and VCC2 are monitored against factory-trimmed thresholds (+2.925V and +2.188V respectively), while RSTIN accepts an external voltage divider to monitor a third rail down to +0.63V using a precision 626mV internal reference. All three comparators feed into a shared reset timer with 210ms timeout (D3 suffix).
Its watchdog subsystem operates in dual-mode: a 35s minimum startup delay after reset enables full system initialization, followed by a 1.12s minimum normal timeout period triggered by WDI edge transitions. The push-pull RESET and WDO outputs eliminate need for external pullups and support direct interfacing with bidirectional µP reset pins when used with a 10kΩ series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +2.925V nominal (SH suffix); monitors primary supply with ±1.5% accuracy over temperature |
| VCC2 Threshold | +2.188V nominal (Y suffix); monitors secondary supply with ±1.5% accuracy over temperature |
| RSTIN Threshold | 626mV internal reference; enables monitoring of third voltage via resistive divider (e.g., +3.3V rail) |
| Reset Timeout | 210ms (D3 suffix); ensures sufficient hold time for processor boot and peripheral initialization |
| Supply Current | 14µA typical at +3.6V; enables use in battery-operated systems without significant quiescent drain |
| Operating Temp | -40°C to +125°C; supports industrial and automotive under-hood applications without derating |
| Output Type | Push-pull RESET and WDO; eliminates external pullup components and simplifies PCB layout |
Pinout & Package
MAX6735AKASHD3+ is housed in an 8-pin SOT23-8 package (K8S-3), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and JEDEC MO-178 compliant outline. The package supports reflow soldering and is available in lead-free (+T) configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1/VCC2/RSTIN undervoltage or MR assertion; no external pullup required |
| 2 - GND | Ground reference | Common return for all internal circuitry and comparator references; must be low-impedance connection |
| 3 - VCC2 | Secondary supply input | Monitored at +2.188V threshold; powers internal circuitry when VCC2 > VCC1; supports 0.8V–5.5V range |
| 4 - MR | Active-low manual reset input | Internal 50kΩ pullup to VCC1; drives RST low when asserted; 1µs minimum pulse width accepted |
| 5 - WDI | Watchdog input | Edge-sensitive; clears watchdog timer on rising/falling transition; floating state does not disable watchdog |
| 6 - VCC1 | Primary supply input | Monitored at +2.925V threshold; powers device when VCC1 > VCC2; supports 0.8V–5.5V range |
| 7 - RSTIN | Adjustable reset comparator input | High-impedance (±100nA) input referenced to 626mV; used with external divider to monitor third voltage |
| 8 - WDO | Active-low watchdog output | Push-pull driver; asserts low if WDI remains static beyond timeout; deasserts immediately upon valid WDI edge |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises two factory-set supplies (VCC1/VCC2) plus one user-adjustable rail (RSTIN), reducing BOM count vs. discrete solutions |
| Dual-mode watchdog timer | 35s startup delay enables full system boot before watchdog activation; 1.12s normal timeout provides rapid fault response during runtime |
| Push-pull RESET/WDO outputs | Eliminates need for external pullup resistors, reduces component count, and improves noise immunity in high-speed digital environments |
| Guaranteed reset down to VCC = +0.8V | Ensures valid reset assertion during deep brownout conditions, critical for nonvolatile memory write protection and safe power-down sequencing |
| Immunity to short VCC transients | Rejects glitches ≤10µs (at 75mV overdrive), preventing spurious resets in noisy power environments such as motor drives or switching regulators |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Monitoring +3.3V I/O, +1.8V core, and +1.2V auxiliary rails in a field-deployed programmable logic controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-voltage supervisor providing coordinated reset assertion across all rails, with push-pull outputs driving FPGA and microcontroller reset lines simultaneously. Use Value: Prevents partial initialization failures by holding reset until all three rails stabilize above their respective thresholds (2.925V, 2.188V, and derived ~1.2V via RSTIN divider), ensuring deterministic boot. |
Use Scenario: Supervising +5V backplane, +3.3V PHY, and +1.5V SerDes supplies in a carrier-grade Ethernet line card operating continuously at +85°C ambient. IC Role / Device Role / Timing Role: High-temperature-rated supervisor delivering 210ms reset hold time and dual-mode watchdog to detect firmware hangs in packet-processing pipelines. Use Value: 14µA supply current minimizes thermal load in densely packed cards, while push-pull WDO directly triggers hardware recovery without external level-shifting. |
| Medical Imaging Sensor Module | Automotive ADAS Camera ECU |
Use Scenario: Ensuring reliable startup and runtime supervision of +2.5V analog front-end, +1.2V image sensor core, and +3.3V interface supplies in portable ultrasound equipment. IC Role / Device Role / Timing Role: Triple-rail supervisor with manual reset button support (MR) and adjustable RSTIN channel for custom sensor bias voltage monitoring. Use Value: Adjustable RSTIN input enables precise monitoring of nonstandard sensor bias rails (e.g., +2.8V) using only two external resistors, avoiding dedicated voltage monitors. |
Use Scenario: Monitoring +5V camera power, +3.3V SoC I/O, and +1.1V vision processor core in an AEC-Q100 qualified rear-view camera module. IC Role / Device Role / Timing Role: Automotive-grade supervisor asserting reset during cold-crank (VCC drop to +0.8V) and detecting software lockups via WDI edge monitoring. Use Value: Guaranteed reset validity down to +0.8V ensures safe shutdown of image pipeline during severe brownout, preventing corrupted frame buffers or flash corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKASHD3+ | Same pinout and thresholds, but open-drain RESET and WDO outputs require external pullups | Suitable where level translation or wired-OR reset bus is needed; incompatible with direct µP reset pin drive without series resistor | Select when system requires reset signal sharing across multiple supervisors or compatibility with legacy open-drain designs |
| TPS3808G33DBVR | Dual-voltage supervisor only (no RSTIN), 3.3V fixed VDD threshold, 200ms timeout, 2.5µA supply current | Lacks third adjustable monitoring channel; optimized for low-power single-rail applications rather than multivoltage systems | Choose for cost-sensitive, single-supply designs where RSTIN functionality is unnecessary and ultra-low quiescent current is prioritized |
Compared with MAX6734AKASHD3+, the MAX6735AKASHD3+ offers direct-drive capability for µP reset pins without external components, while versus TPS3808G33DBVR it delivers essential triple-rail supervision for complex SoC platforms-making it optimal for new multivoltage embedded designs requiring robust, integrated reset and watchdog control.
Availability
MAX6735AKASHD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging modules, and automotive ADAS ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6735AKASHD3+ 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 industrial, communications, and computing markets.
The MAX6730A–MAX6735A family was designed to replace discrete reset circuits and multiple standalone supervisors in multivoltage µP systems, integrating triple-rail monitoring, manual reset, and dual-mode watchdog into space-constrained SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735AKASHD3+?
The MAX6735AKASHD3+ has factory-set thresholds of +2.925V for VCC1 (SH suffix) and +2.188V for VCC2 (Y suffix), with ±1.5% tolerance over the full -40°C to +125°C range. These values are laser-trimmed during production and specified in the Electrical Characteristics table under VTH1 and VTH2 parameters. The SH/Y combination is confirmed in Table 1 of the datasheet and matches the top-mark code +AEOM.
Does the MAX6735AKASHD3+ support monitoring a third voltage, and how is it configured?
Yes, the MAX6735AKASHD3+ supports third-voltage monitoring via the RSTIN pin, which features a precision 626mV internal reference. To monitor a higher voltage (e.g., +3.3V), connect a resistive divider between the supply and GND, with the midpoint fed to RSTIN. The divider ratio is calculated as R2/(R1+R2) = 626mV/VMON. The MAX6735AKASHD3+ datasheet Figure 2 shows this configuration, and RSTIN leakage is limited to ±100nA to minimize divider error.
What is the function of the MR pin on the MAX6735AKASHD3+, and what are its electrical requirements?
The MR (Manual Reset) pin on the MAX6735AKASHD3+ is an active-low input that forces RST assertion when pulled below 0.3×VCC1. It includes a 50kΩ internal pullup to VCC1, so it may be left unconnected if unused. The pin accepts CMOS logic levels, requires a minimum 1µs pulse width, and rejects glitches shorter than 100ns. Driving MR low holds RST active for the full 210ms timeout after release, making it ideal for front-panel reset buttons or test-mode entry.
How does the watchdog timer operate on the MAX6735AKASHD3+, and what are its timing modes?
The MAX6735AKASHD3+ watchdog operates in two distinct modes: a 35s minimum startup delay (tWD-L) after any reset event (power-up, brownout, or MR assertion), allowing full system initialization; then a 1.12s minimum normal timeout (tWD-S) triggered by each valid WDI edge. The timer clears on any rising or falling edge at WDI and asserts WDO low if no edge occurs within the active timeout window. This dual-mode architecture prevents false timeouts during boot while enabling rapid fault detection during runtime.
What package type and footprint does the MAX6735AKASHD3+ use, and are there layout considerations?
The MAX6735AKASHD3+ uses an 8-pin SOT23-8 package (K8S-3), with 0.65mm pitch, 2.9mm × 1.6mm body size, and gull-wing leads. Layout best practices include placing a 0.1µF ceramic capacitor between VCC1 and GND as close as possible to the device, routing RST and WDO traces away from noisy switching nodes, and using short, direct connections for MR and WDI to minimize EMI susceptibility. The datasheet Package Information section provides mechanical drawings and solder profile guidance.
MAX6735AKASHD3+ 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.313V, 2.925V, 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
MAX6735AKASHD3+ FAQ
1.How can I place an order for MAX6735AKASHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKASHD3+ 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 MAX6735AKASHD3+ reliable?
The price and inventory of MAX6735AKASHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKASHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6735AKASHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKASHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKASHD3+?
MAX6735AKASHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKASHD3+ 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 MAX6735AKASHD3+?
For technical support, including MAX6735AKASHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKASHD3+ requirements.
6.How does Aetrix verify that MAX6735AKASHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6735AKASHD3+ 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 MAX6735AKASHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6735AKASHD3+?
All MAX6735AKASHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKASHD3+, 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 MAX6735AKASHD3+ part is unused and in its original packaging.
Return procedure for MAX6735AKASHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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