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Analog Devices Inc./Maxim Integrated MAX6735AKASHD3+T
- Part No.:
- MAX6735AKASHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKASHD3+T.pdf
- Description:
- IC SUPERVISOR MPU W/WD SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,051
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Product details
Overview
MAX6735AKASHD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with push-pull reset and watchdog outputs, factory-set VCC1 = +2.925V and VCC2 = +1.313V thresholds, 140–280ms reset timeout, and adjustable RSTIN input (626mV reference) for monitoring third supply voltages down to +0.63V. It operates across –40°C to +125°C and supports manual reset, independent watchdog timer startup delay (35s min), and normal timeout (1.12s min).
For engineers reviewing the MAX6735AKASHD3+T datasheet, MAX6735AKASHD3+T pinout, MAX6735AKASHD3+T application, or MAX6735AKASHD3+T equivalent, this device delivers verified triple-supply monitoring, guaranteed reset validity down to VCC = +0.8V, low 14µA typical supply current, immunity to short VCC transients, and SOT23-8 packaging for space-constrained multivoltage systems.
Technical Context
The MAX6735AKASHD3+T implements a dual-mode watchdog timer: a 35s minimum initial timeout after reset enables full system initialization, followed by a 1.12s minimum normal timeout for rapid fault detection. Its triple-monitor architecture independently supervises VCC1 (+2.925V threshold), VCC2 (+1.313V threshold), and an externally scaled voltage via RSTIN using a precise 626mV internal reference.
Reset assertion is active-low and push-pull, guaranteeing valid output down to VCC1 or VCC2 = +0.8V. The manual reset input (MR) features a 50kΩ internal pullup and 1µs minimum pulse width support, while RSTIN exhibits only ±100nA input current and 3mV hysteresis - enabling high-impedance, low-power external voltage-divider configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +2.925V nominal; factory-set falling threshold for primary supply monitoring |
| VCC2 Threshold | +1.313V nominal; factory-set falling threshold for secondary supply monitoring |
| RSTIN Reference | 626mV internal comparator reference; enables adjustable third-supply monitoring down to +0.63V |
| Reset Timeout | 140–280ms (D3 suffix); ensures sufficient processor reset hold time in power-up/brownout recovery |
| Watchdog Timeout | 35s min initial period, then 1.12s min normal period; prevents lockup during boot and runtime |
| Supply Current | 14µA typical at +3.6V; enables long battery life in portable equipment |
| Operating Temp | –40°C to +125°C; fully specified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6735AKASHD3+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 BA compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Drives low without external pullup when VCC1/VCC2/RSTIN drop below threshold or MR is asserted; asserts for full reset timeout period |
| 2 - GND | Ground reference | Common return path for all internal circuitry and external bias networks |
| 3 - VCC2 | Secondary supply input | Power source and monitored voltage for second fixed-threshold channel (VTH2 = +1.313V) |
| 4 - MR | Active-low manual reset input | Forced reset initiation; internally pulled up to VCC1 (50kΩ); requires CMOS-compatible drive |
| 5 - WDI | Watchdog input | Edge-sensitive input; clears watchdog timer on rising/falling transition; floating does not disable watchdog |
| 6 - VCC1 | Primary supply input | Power source and monitored voltage for first fixed-threshold channel (VTH1 = +2.925V) |
| 7 - RSTIN | Adjustable reset comparator input | High-impedance (±100nA) input referenced to 626mV; accepts resistive divider for third-supply monitoring |
| 8 - WDO | Active-low push-pull watchdog output | Asserts low if no WDI edge occurs within timeout; deasserts immediately upon valid edge or threshold recovery |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneously supervises VCC1 (+2.925V), VCC2 (+1.313V), and scalable RSTIN input - eliminating need for three discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay enables full firmware initialization; 1.12s runtime timeout provides fast lockup detection without false triggers |
| Guaranteed reset down to +0.8V | Ensures reliable reset assertion even during deep brownout conditions where VCC drops near operational floor |
| Immunity to short VCC transients | Rejects glitches ≤10µs (at 75mV overdrive), preventing spurious resets in noisy power environments |
| Low 14µA supply current | Minimizes quiescent drain in always-on battery-backed systems such as set-top boxes and IoT edge nodes |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +3.3V core logic, +1.2V FPGA I/O, and +2.5V analog supply in telecom line cards during hot-swap insertion. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across domains using push-pull RST and WDO outputs. Use Value: Prevents partial initialization and metastability by ensuring all rails exceed thresholds before releasing reset - validated over –40°C to +125°C. | Use Scenario: Supervising +24V field power, +5V controller rail, and +3.3V communication interface in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Detects undervoltage on any of three critical rails and triggers system-wide reset via push-pull RST output. Use Value: Guarantees reset validity down to VCC = +0.8V, enabling safe shutdown during gradual 24V rail collapse in harsh industrial environments. |
| Portable Medical Monitor | Laser Printer Engine Control |
Use Scenario: Managing battery-backed +3.0V MCU, +1.8V sensor ADC, and +5.0V display driver in handheld diagnostic devices. IC Role / Device Role / Timing Role: Adjustable RSTIN input monitors scaled +5.0V rail via resistor divider; MR enables user-initiated recalibration reset. Use Value: 14µA typical supply current extends battery life; manual reset avoids firmware reflash for field calibration. | Use Scenario: Coordinating +24V motor drivers, +12V logic, and +3.3V imaging ASIC in laser printer mainboards during wake-from-standby. IC Role / Device Role / Timing Role: Uses D3 reset timeout (140–280ms) to synchronize mechanical actuator startup with digital subsystem readiness. Use Value: Independent watchdog output (WDO) feeds safety-critical motion controller, providing redundant lockup detection beyond main µP reset path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKASHD3+T | Same pinout and thresholds, but open-drain RST/WDO outputs requiring external pullups | Suitable where level-shifting or wired-OR reset bus is required; incompatible with direct push-pull interfacing | Select when system design mandates open-drain reset signaling or shared reset busing |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no RSTIN input, no manual reset, 200ms fixed timeout | Lacks triple-monitoring and adjustable input; limited to single-rail applications with no manual intervention needs | Choose only for cost-sensitive, single-voltage designs without watchdog or manual reset requirements |
Compared with MAX6734AKASHD3+T and TPS3808G33DBVR, MAX6735AKASHD3+T uniquely combines triple-supply monitoring, push-pull outputs, manual reset, and adjustable RSTIN - making it the only option for compact, high-reliability multivoltage systems requiring guaranteed reset assertion and independent watchdog signaling without external components.
Availability
MAX6735AKASHD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, portable medical monitors, and laser printer engine control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6735AKASHD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6730A–MAX6735A family targets high-reliability embedded systems requiring coordinated multi-rail supervision, robust watchdog protection, and operation across –40°C to +125°C - especially where board space and external component count must be minimized.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6735AKASHD3+T?
The MAX6735AKASHD3+T has a factory-set VCC1 reset threshold of +2.925V (nominal, falling), with tolerance of +2.850V to +3.000V over temperature. This value is encoded in the "SH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is fully specified across –40°C to +125°C.
Does MAX6735AKASHD3+T support manual reset functionality?
Yes, MAX6735AKASHD3+T includes an active-low manual reset input (MR) with an internal 50kΩ pullup resistor to VCC1. Driving MR low forces immediate reset assertion, and RST remains low for the full D3 timeout period (140–280ms) after MR returns high - enabling field service, calibration, or test-mode initiation.
What is the function of the RSTIN pin on MAX6735AKASHD3+T?
The RSTIN pin on MAX6735AKASHD3+T is a high-impedance comparator input with a fixed 626mV internal reference. It allows monitoring of a third supply voltage - e.g., +5V or +12V - via an external resistive divider. The MAX6735AKASHD3+T asserts reset if the divided voltage at RSTIN falls below 626mV.
How does the watchdog timer operate on MAX6735AKASHD3+T?
The MAX6735AKASHD3+T watchdog timer operates in two modes: a 35s minimum initial timeout after reset (for system boot), then a 1.12s minimum normal timeout. It clears on any WDI edge and asserts WDO low if no edge occurs within the active timeout window - providing both safe initialization and rapid runtime lockup detection.
What package type and pin count does MAX6735AKASHD3+T use?
MAX6735AKASHD3+T uses an 8-pin SOT23-8 package (K8S-3), with gull-wing leads, 0.65mm pitch, and JEDEC MO-178 BA compliance. Its footprint measures 2.9mm × 1.6mm, making it suitable for dense PCB layouts in space-constrained applications like portable medical and networking equipment.
MAX6735AKASHD3+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:
- 1.313V, 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
MAX6735AKASHD3+T FAQ
1.How can I place an order for MAX6735AKASHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKASHD3+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 MAX6735AKASHD3+T reliable?
The price and inventory of MAX6735AKASHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKASHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735AKASHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKASHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKASHD3+T?
MAX6735AKASHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKASHD3+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 MAX6735AKASHD3+T?
For technical support, including MAX6735AKASHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKASHD3+T requirements.
6.How does Aetrix verify that MAX6735AKASHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735AKASHD3+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 MAX6735AKASHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735AKASHD3+T?
All MAX6735AKASHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKASHD3+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 MAX6735AKASHD3+T part is unused and in its original packaging.
Return procedure for MAX6735AKASHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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