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Analog Devices Inc./Maxim Integrated MAX6735AKASVD3+T
- Part No.:
- MAX6735AKASVD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKASVD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6735AKASVD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with push-pull reset and watchdog outputs, monitoring +2.925V (VCC1), +1.665V (VCC2), and adjustable input down to +0.626V via RSTIN. It features 210ms reset timeout, 35s initial watchdog startup delay, and operates across –40°C to +125°C for industrial-grade system reliability in multivoltage embedded control.
For engineers reviewing the MAX6735AKASVD3+T datasheet, MAX6735AKASVD3+T pinout, MAX6735AKASVD3+T application, or MAX6735AKASVD3+T equivalent, this page delivers verified electrical parameters, exact SOT23-8 pin mapping, confirmed triple-supply monitoring behavior, and validated alternative options for brownout detection and watchdog supervision in telecom, server, and portable equipment.
Technical Context
The MAX6735AKASVD3+T integrates three independent voltage monitors: a factory-set +2.925V threshold on VCC1, +1.665V on VCC2, and a precision 626mV reference for RSTIN-enabling third-supply monitoring via external resistor divider. Its dual-mode watchdog uses a 35s minimum startup delay followed by 1.12s normal timeout, with WDI edge-triggered clearing.
Reset assertion occurs when any monitored supply falls below its threshold, RSTIN drops below 626mV, or MR is pulled low; RST remains active for the full 210ms timeout after all conditions clear. The push-pull RST and WDO outputs drive loads directly without pull-up resistors, supporting immediate system recovery in fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +2.925V nominal (S suffix), ±1.5% over temperature - sets primary supply brownout detection point for +3.3V rails |
| VCC2 Reset Threshold | +1.665V nominal (V suffix), ±1.5% over temperature - targets secondary +1.8V core or I/O supply monitoring |
| RSTIN Reference Voltage | +626mV internal comparator threshold - enables precise third-supply monitoring down to +0.63V using external divider |
| Reset Timeout Period | 140ms to 280ms (D3 suffix) - guarantees minimum processor hold time during power stabilization |
| Watchdog Timeout | 35s min startup delay, 1.12s min normal mode - accommodates boot sequences then enforces rapid lockup detection |
| Supply Current | 14µA typical at +3.6V - enables always-on supervision in battery-backed systems without significant drain |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom base station environments |
Pinout & Package
MAX6735AKASVD3+T 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. 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 during brownout, manual reset, or RSTIN undervoltage; no external pull-up required |
| 2 - GND | Ground reference | Common return for all internal comparators, watchdog logic, and output drivers |
| 3 - VCC2 | Secondary supply input | Monitored at +1.665V threshold; powers internal circuitry when VCC2 > VCC1 |
| 4 - WDO | Active-low watchdog output | Push-pull driver; asserts low if WDI lacks edge for >1.12s (normal) or >35s (startup) |
| 5 - VCC1 | Primary supply input | Monitored at +2.925V threshold; powers device when VCC1 > VCC2; defines reset timing reference |
| 6 - RSTIN | Adjustable reset comparator input | High-impedance node referenced to 626mV; accepts divided-down voltages ≥626mV for third-rail monitoring |
| 7 - MR | Active-low manual reset input | Internally pulled up to VCC1 (50kΩ); drives RST low when asserted; supports momentary switch interface |
| 8 - WDI | Watchdog input | Edge-sensitive input; rising or falling transition clears watchdog timer; floating state does not disable function |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneously supervises VCC1 (+2.925V), VCC2 (+1.665V), and RSTIN (626mV reference) - eliminates need for discrete supervisors in multirail systems |
| Dual-mode watchdog timer | 35s startup delay allows full system boot before watchdog enforcement; 1.12s normal timeout ensures rapid response to software hangs |
| Push-pull RST and WDO outputs | Direct-drive capability removes external pull-up resistors, reduces BOM count, and improves noise immunity in high-speed digital environments |
| Guaranteed operation down to VCC = +0.8V | Valid reset assertion maintained even as supplies sag near brownout - critical for fail-safe shutdown in power-fail scenarios |
| Immunity to short VCC transients | Rejects glitches ≤10µs at 75mV overdrive - prevents spurious resets during switching noise or load transients |
Applications
| Telecom Power Management | Industrial PLC Controller |
|---|---|
|
Use Scenario: Monitoring +3.3V backplane, +1.8V FPGA core, and +1.2V ADC supply in a 48V-powered telecom shelf. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting synchronized reset across all domains upon any rail failure; 210ms timeout ensures stable reinitialization. Use Value: Prevents partial initialization and metastability in mixed-voltage ASIC/FPGA systems during AC brownouts or hot-swap events. |
Use Scenario: Supervising +24V I/O, +5V logic, and +3.3V microcontroller supply in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Detects undervoltage on any rail and triggers hardware reset; MR input enables front-panel emergency stop functionality. Use Value: Eliminates firmware-level watchdog reliance, enabling deterministic recovery from power sags without software intervention. |
| Server Baseboard Management | Portable Medical Monitor |
|
Use Scenario: Validating +12V VRM input, +5V standby, and +3.3V BMC supply in a redundant server management controller. IC Role / Device Role / Timing Role: Independent watchdog monitors BMC firmware execution via WDI; RSTIN tracks auxiliary +1.5V sensor rail. Use Value: Enables autonomous recovery from BMC lockups while maintaining supply integrity checks - critical for lights-out management. |
Use Scenario: Ensuring reliable boot and runtime supervision of +3.3V MCU, +2.5V display driver, and +1.8V analog front-end in a battery-operated ECG monitor. IC Role / Device Role / Timing Role: Low 14µA quiescent current extends battery life; push-pull outputs drive reset lines directly without leakage concerns. Use Value: Guarantees clinical-grade system availability by preventing silent failures during low-power sleep modes or battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKASVD3+T | Same pinout and thresholds, but open-drain RST/WDO outputs requiring external pull-ups | Suitable where level-shifting or wired-OR reset bus is needed; less suitable for direct MCU reset pins without pull-up | Select when interfacing with legacy µPs requiring open-drain reset or shared reset busses |
| TPS3808G33DBVR | Dual-supply monitor only (+3.3V fixed + adjustable), no RSTIN input; 200ms timeout; 2.5µA IQ | Lacks third-supply monitoring and manual reset; optimized for ultra-low-power single-rail applications | Choose for cost-sensitive, single-supply designs where RSTIN and MR are unnecessary |
Compared with MAX6735AKASVD3+T, MAX6734AKASVD3+T offers identical monitoring but requires external pull-ups, while TPS3808G33DBVR reduces feature set and quiescent current but omits triple-supply capability and manual reset - making MAX6735AKASVD3+T optimal for complex multivoltage systems needing guaranteed push-pull drive and full supervision coverage.
Availability
MAX6735AKASVD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and medical device applications requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for MAX6735AKASVD3+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 demanding industrial, automotive, and communications applications, with emphasis on reliability, integration, and thermal robustness.
The MAX6730A–MAX6735A family was engineered to replace discrete reset circuits and multiple voltage monitors in space-constrained embedded systems, delivering triple-supply supervision, watchdog safety, and manual reset in sub-3mm² packages.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6735AKASVD3+T?
The MAX6735AKASVD3+T has a factory-set VCC1 reset threshold of +2.925V (S suffix), with ±1.5% tolerance over –40°C to +125°C. This value is confirmed in Table 1 of the datasheet and applies specifically to the "S" threshold code in the part number. The threshold is referenced to an internal bandgap and includes 0.5% hysteresis to prevent chatter during slow supply ramps.
Does MAX6735AKASVD3+T support monitoring a third voltage higher than 0.626V?
Yes, MAX6735AKASVD3+T supports third-voltage monitoring above 0.626V using the RSTIN pin with an external resistor divider. The internal 626mV reference allows calculation of external thresholds: VEXT_TH = 626mV × (R1 + R2)/R2. For example, a 100kΩ/100kΩ divider monitors +1.252V. RSTIN draws only ±100nA, enabling high-resistance dividers to minimize power loss.
What is the watchdog timeout behavior after power-on for MAX6735AKASVD3+T?
Upon power-on or reset assertion, MAX6735AKASVD3+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). This dual-mode architecture prevents false timeouts during lengthy initialization sequences.
Can MAX6735AKASVD3+T operate with VCC1 and VCC2 supplied from different sources?
Yes, MAX6735AKASVD3+T supports independent VCC1 and VCC2 supplies - the device powers itself from whichever supply is higher (VCC1 if ≥ VCC2, else VCC2). Both rails are monitored simultaneously, and reset asserts if either falls below its threshold. The internal power selector ensures supervision remains active even if one rail fails completely.
Is the MR input on MAX6735AKASVD3+T internally pulled up, and what is its default state?
Yes, the MR input on MAX6735AKASVD3+T includes a 50kΩ internal pull-up resistor to VCC1. When left unconnected or tied to VCC1, MR remains deasserted (high), allowing normal operation. Driving MR low forces immediate RST assertion for duration of the 210ms timeout - ideal for front-panel reset buttons or test-mode entry without external components.
MAX6735AKASVD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.575V, 2.925V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735AKASVD3+T FAQ
1.How can I place an order for MAX6735AKASVD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKASVD3+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 MAX6735AKASVD3+T reliable?
The price and inventory of MAX6735AKASVD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKASVD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735AKASVD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKASVD3+T transactions.
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4.How is shipping managed for MAX6735AKASVD3+T?
MAX6735AKASVD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKASVD3+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 MAX6735AKASVD3+T?
For technical support, including MAX6735AKASVD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKASVD3+T requirements.
6.How does Aetrix verify that MAX6735AKASVD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735AKASVD3+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 MAX6735AKASVD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735AKASVD3+T?
All MAX6735AKASVD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKASVD3+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 MAX6735AKASVD3+T part is unused and in its original packaging.
Return procedure for MAX6735AKASVD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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