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Analog Devices Inc./Maxim Integrated MAX6735KARVD3+
- Part No.:
- MAX6735KARVD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KARVD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,147
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Product details
Overview
MAX6735KARVD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+3.075V nominal), VCC2 (+2.313V nominal), and an adjustable RSTIN input (626mV threshold). It features push-pull RESET and WDO outputs, 140–280ms reset timeout, manual reset input, and operates across –40°C to +85°C. It is used in multivoltage embedded systems requiring reliable power-on reset and system lockup protection.
For engineers reviewing the MAX6735KARVD3+ datasheet, MAX6735KARVD3+ pinout, MAX6735KARVD3+ application, or MAX6735KARVD3+ equivalent, key selection considerations include its dual fixed-threshold supervision (VCC1/VCC2), third adjustable voltage monitor, push-pull active-low reset and watchdog outputs, 14µA typical supply current, and SOT23-8 package compatibility with space-constrained industrial and telecom designs.
Technical Context
The MAX6735KARVD3+ implements a triple-supply monitoring architecture: two factory-set thresholds (VTH1 = 3.075V, VTH2 = 2.313V) for primary and secondary rails, plus a high-impedance RSTIN comparator referenced to an internal 626mV bandgap. Its watchdog timer operates in dual-mode-35s minimum startup delay after reset, then 1.12s minimum normal timeout-ensuring safe boot initialization and rapid fault detection during runtime.
Reset assertion is synchronized across all monitored inputs: VCC1, VCC2, RSTIN, or MR. The push-pull RST and WDO outputs drive low without external pullups, guaranteeing valid reset signaling down to VCC1/VCC2 = +0.8V. Immunity to sub-100ns VCC transients and 0.5% reset threshold hysteresis enhance noise robustness in noisy power environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 3.075V (nominal); monitors +3.3V rail with ±1.5% tolerance over temperature |
| VCC2 Reset Threshold | 2.313V (nominal); monitors +2.5V or +1.8V rail with ±1.5% tolerance |
| RSTIN Threshold | 626mV (typical); enables monitoring of third voltage via resistive divider (e.g., +5V, +3.3V) |
| Reset Timeout Period | 140–280ms (D3 option); ensures sufficient hold time for processor initialization |
| Watchdog Timeout (Startup) | 35s min; allows full system boot before watchdog enforcement begins |
| Watchdog Timeout (Normal) | 1.12s min; detects software hangs within sub-second window |
| Supply Current | 14µA (typ at +3.6V); enables battery-backed operation in portable equipment |
Pinout & Package
SOT23-8 package: 2.9mm × 1.6mm footprint, 1.1mm height, lead-free RoHS-compliant, thermal resistance θJA = 180°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Drives low without external pullup; asserts on any undervoltage or MR event |
| 2 - GND | Ground reference | Common return for all internal comparators, timers, and I/O |
| 3 - VCC2 | Secondary supply input | Powers secondary monitor circuitry; threshold = 2.313V (R suffix) |
| 4 - MR | Active-low manual reset input | 50kΩ internal pullup to VCC1; 1µs minimum pulse width required |
| 5 - WDI | Watchdog input | Edge-sensitive; clears watchdog timer on rising/falling transition |
| 6 - RSTIN | Adjustable reset comparator input | High-impedance (±25nA), referenced to 626mV; supports external voltage divider |
| 7 - WDO | Active-low push-pull watchdog output | Asserts low if WDI stalls >1.12s (normal mode) or >35s (startup mode) |
| 8 - VCC1 | Primary supply input | Powers core logic and primary monitor; threshold = 3.075V (T suffix) |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1, VCC2, and RSTIN-eliminates need for three discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay prevents false timeout during boot; 1.12s runtime timeout ensures fast hang detection |
| Push-pull RST and WDO outputs | No external pullups required; compatible with bidirectional µP reset pins when used with 10kΩ series resistor |
| Low 14µA supply current | Enables use in always-on subsystems and battery-powered applications without significant drain |
| Immunity to short VCC transients | Rejects <100ns glitches; avoids spurious resets in electrically noisy industrial environments |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring +3.3V, +2.5V, and +5V rails in a multi-rail telecom line card during hot-swap insertion. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across FPGA, DSP, and interface ICs upon any rail dropout. Use Value: Prevents partial initialization and state corruption by holding reset until all rails stabilize above 3.075V, 2.313V, and 626mV-derived thresholds. |
Use Scenario: Ensuring deterministic startup and recovery in a DIN-rail mounted programmable logic controller with isolated +24V, +5V, and +3.3V domains. IC Role / Device Role / Timing Role: Supervising primary logic supply (+3.3V), I/O buffer supply (+5V), and auxiliary analog supply (+2.5V) with manual reset override for field service. Use Value: Guarantees µP reset validity down to VCC = +0.8V and provides 140ms minimum reset hold time for firmware self-test execution. |
| Medical Diagnostic Imaging Module | Automotive Infotainment Head Unit |
Use Scenario: Managing power integrity across high-precision ADC, FPGA, and display controller supplies in portable ultrasound equipment. IC Role / Device Role / Timing Role: Monitoring +1.8V (FPGA core), +3.3V (I/O), and +5V (analog front-end) with adjustable RSTIN for custom bias rail. Use Value: Enables single-chip supervision of three nonstandard rails using resistor-divider scaling on RSTIN-reducing BOM count and PCB area. |
Use Scenario: Providing fail-safe reset and watchdog coverage for ARM-based infotainment SoC with multiple voltage domains under automotive temperature stress. IC Role / Device Role / Timing Role: Supervising +1.2V SoC core, +3.3V peripheral, and +5V USB/Display supplies while interfacing with vehicle CAN bus reset coordination logic. Use Value: Push-pull outputs ensure clean reset signaling into noisy automotive ground planes; 14µA quiescent current minimizes battery drain during ignition-off sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KARVD3+ | Same triple-supply architecture and pinout, but open-drain RST/WDO outputs require external pullups | Better suited for wired-OR reset buses or level-shifting interfaces where open-drain behavior is required | Select MAX6734KARVD3+ only if system design mandates open-drain reset signaling or shared reset bus topology |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no RSTIN input, no manual reset, 200ms fixed timeout, SOT23-6 | Limited to single-rail monitoring; lacks adjustable third input and manual reset capability | Choose TPS3808G33DBVR only for cost-sensitive, single-voltage applications where triple monitoring is unnecessary |
Compared with MAX6734KARVD3+, the MAX6735KARVD3+ offers push-pull outputs eliminating pullup components and simplifying layout; versus TPS3808G33DBVR, it delivers triple-rail supervision, manual reset, and configurable watchdog timing-making it suitable for complex, safety-critical embedded systems requiring comprehensive power monitoring.
Availability
MAX6735KARVD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX6735KARVD3+ 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 MAX6730–MAX6735 family was engineered for high-reliability microprocessor supervision in multivoltage systems-emphasizing accurate threshold matching, glitch immunity, and flexible watchdog timing to prevent system lockup.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735KARVD3+?
The MAX6735KARVD3+ has factory-set thresholds: VCC1 = 3.075V (T suffix) and VCC2 = 2.313V (R suffix), with ±1.5% tolerance over –40°C to +85°C. These values are confirmed in the Reset Voltage Threshold Suffix Guide (Table 1) and Electrical Characteristics section of the datasheet. The MAX6735KARVD3+ uses these precise thresholds to supervise common +3.3V and +2.5V rails without external calibration.
Does the MAX6735KARVD3+ support monitoring a third voltage higher than 626mV?
Yes-the MAX6735KARVD3+ includes the RSTIN pin with a fixed 626mV internal reference. To monitor voltages above 626mV (e.g., +5V or +12V), connect a resistive divider between the target rail and RSTIN so that the divided voltage equals 626mV at the trip point. The MAX6735KARVD3+ datasheet provides the formula VEXT_TH = 626mV × (R1 + R2)/R2 for calculating resistor values.
What is the function of the MR pin on the MAX6735KARVD3+ and how should it be used?
The MR (Manual Reset) pin on the MAX6735KARVD3+ is an active-low input with a 50kΩ internal pullup to VCC1. Driving MR low forces an immediate reset assertion for the full timeout period (140–280ms). It accepts TTL/CMOS logic levels and requires only a 1µs minimum pulse width. For field service, connect a momentary switch from MR to GND; no external debounce is needed due to built-in 100ns glitch rejection.
How does the watchdog timer operate in the MAX6735KARVD3+ during power-up?
The MAX6735KARVD3+ watchdog timer starts in a 35s minimum startup mode after any reset event (power-on, brownout, or MR assertion). This extended period allows full system initialization before watchdog enforcement begins. After the first valid edge on WDI-or after 35s expires-it switches to normal mode with a 1.12s minimum timeout. This dual-mode behavior prevents false timeouts during boot while ensuring rapid hang detection during runtime.
Is the MAX6735KARVD3+ compatible with bidirectional µP reset pins?
Yes-the MAX6735KARVD3+'s push-pull RST output can interface with bidirectional µP reset pins when a 10kΩ series resistor is placed between RST and the µP pin. This prevents logic contention during µP-driven reset assertion. The MAX6735KARVD3+ datasheet explicitly recommends this configuration in Figure 5, confirming safe interoperability without risk of bus conflict or excessive current draw.
MAX6735KARVD3+ 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:
- 1.575V, 2.625V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735KARVD3+ FAQ
1.How can I place an order for MAX6735KARVD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KARVD3+ 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 MAX6735KARVD3+ reliable?
The price and inventory of MAX6735KARVD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KARVD3+ is usually 5 days.
3.What payment methods are accepted for MAX6735KARVD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KARVD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KARVD3+?
MAX6735KARVD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KARVD3+ 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 MAX6735KARVD3+?
For technical support, including MAX6735KARVD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KARVD3+ requirements.
6.How does Aetrix verify that MAX6735KARVD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6735KARVD3+ 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 MAX6735KARVD3+ meets industry standards.
7.What is the process for return or replacement of MAX6735KARVD3+?
All MAX6735KARVD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KARVD3+, 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 MAX6735KARVD3+ part is unused and in its original packaging.
Return procedure for MAX6735KARVD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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