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Analog Devices Inc./Maxim Integrated MAX6735AKAWGD3+T
- Part No.:
- MAX6735AKAWGD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKAWGD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6735AKAWGD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +3.075V (VCC1), +1.665V (VCC2), and an adjustable input down to +0.63V via RSTIN. It features push-pull RESET and WDO outputs, 210ms reset timeout (D3), and operates across –40°C to +125°C. Used in multivoltage embedded systems requiring reliable power-up sequencing and lockup recovery.
For engineers reviewing the MAX6735AKAWGD3+T datasheet, MAX6735AKAWGD3+T pinout, MAX6735AKAWGD3+T application, or MAX6735AKAWGD3+T equivalent, this page delivers verified specifications, validated pin functions, confirmed triple-supply monitoring behavior, and real-world design context for telecom, industrial, and portable equipment.
Technical Context
The MAX6735AKAWGD3+T integrates three independent voltage monitors: a factory-set +3.075V threshold on VCC1, +1.665V on VCC2, and a precision 626mV reference for RSTIN enabling external resistor-divider-based monitoring of third supplies. Its dual-mode watchdog provides 35s startup delay followed by 1.12s normal timeout, with WDI edge-triggered clearing.
It uses push-pull outputs for both RST and WDO-ensuring defined logic states without external pullups-and includes a manual reset input (MR) with internal 50kΩ pullup. Reset assertion remains valid down to VCC1/VCC2 = +0.8V, and supply current is 14µA typical at +3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (factory-set falling threshold; ensures reliable reset when primary supply drops below nominal core voltage) |
| VCC2 Reset Threshold | +1.665V (factory-set secondary threshold; matches common I/O or memory rail voltages) |
| RSTIN Reference Voltage | +626mV (internal precision reference; enables accurate monitoring of third supply via external divider) |
| Reset Timeout Period | 140ms to 280ms (D3 suffix; guarantees minimum system stabilization time after power-up or fault recovery) |
| Watchdog Timeout (Normal) | 1.12s minimum (short-period mode post-initialization; detects software hangs within tight timing window) |
| Supply Current | 14µA typical at +3.6V (ultra-low quiescent current enables use in battery-backed or always-on systems) |
| Operating Temperature | –40°C to +125°C (fully specified for automotive under-hood, industrial control, and telecom base station environments) |
Pinout & Package
MAX6735AKAWGD3+T is housed in an 8-pin SOT23-8 package (K8S-3), optimized for space-constrained PCB layouts while maintaining thermal performance up to +125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low during VCC1/VCC2/RSTIN undervoltage or MR activation; no external pullup required |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog logic, and output drivers |
| 3 - VCC2 | Secondary supply input | Monitors +1.665V rail; powers internal circuitry when VCC2 > VCC1; supports dual-rail supervision |
| 4 - MR | Active-low manual reset input | Internal 50kΩ pullup to VCC1; drives reset when pulled low; debounced via 1µs pulse width spec |
| 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 +3.075V rail; powers device when VCC1 > VCC2; defines primary reset trigger condition |
| 7 - RSTIN | Adjustable reset comparator input | High-impedance (±100nA) input referenced to 626mV; accepts divided-down voltages for third-rail monitoring |
| 8 - WDO | Active-low watchdog output | Push-pull driver; asserts low if WDI stalls beyond timeout; deasserts immediately upon valid WDI edge or reset release |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises VCC1 (+3.075V), VCC2 (+1.665V), and RSTIN (adjustable down to +0.63V) - eliminates need for multiple discrete supervisors |
| Dual-mode watchdog timer | 35s initial startup delay allows full system boot before watchdog enforcement; 1.12s normal timeout ensures rapid hang detection during runtime |
| Push-pull RST and WDO outputs | Guaranteed high/low states eliminate external pull resistors and reduce BOM count vs. open-drain alternatives |
| Manual reset with integrated pullup | 50kΩ internal MR pullup simplifies board layout; supports momentary switch interface without added components |
| Immunity to short VCC transients | Rejects sub-100ns glitches per typical operating characteristics; prevents spurious resets in noisy power environments |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Supervises +3.3V CPU core, +1.8V FPGA I/O, and +1.2V DDR termination rail in a fanless, convection-cooled PLC module. IC Role / Device Role / Timing Role: Triple-rail monitor with push-pull RST/WDO ensures deterministic reset coordination and watchdog-driven recovery from firmware stalls. Use Value: Eliminates need for three separate supervisors; 210ms D3 timeout aligns with FPGA configuration time; –40°C to +125°C rating supports uncooled cabinet deployment. |
Use Scenario: Monitors +5V backplane, +3.3V PHY, and +1.2V SerDes supply in a hot-swappable line card with strict power sequencing requirements. IC Role / Device Role / Timing Role: RSTIN configured for +1.2V SerDes rail using 100kΩ/200kΩ divider; MR tied to card-present detect signal for automatic reset on insertion. Use Value: Adjustable RSTIN enables precise SerDes rail supervision; push-pull outputs drive multiple downstream ASIC reset pins directly; 14µA ICC supports low-power standby modes. |
| Medical Imaging Sensor Node | Automotive ADAS Camera Module |
Use Scenario: Ensures reliable boot and runtime supervision of +2.5V image sensor analog supply, +1.8V digital core, and +1.0V ADC reference in a battery-powered portable ultrasound probe. IC Role / Device Role / Timing Role: VCC1/VCC2 set to match sensor and processor rails; RSTIN monitors critical ADC reference; MR linked to emergency shutdown button. Use Value: Ultra-low 14µA supply current extends battery life; guaranteed reset validity down to +0.8V prevents brownout-induced corruption; D3 timeout accommodates slow analog settling. |
Use Scenario: Supervises +5V camera power, +3.3V ISP, and +1.1V MIPI CSI-2 PHY in an AEC-Q200 qualified rear-view camera module exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Operates across full –40°C to +125°C range; push-pull RST drives camera SoC reset pin directly; WDO connected to safety MCU for fail-safe escalation. Use Value: Extended temperature rating avoids derating or heatsinking; 35s watchdog startup delay covers cold-start camera initialization; lead-free +T packaging meets automotive RoHS/ELV compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKAWGD3+T | Same pinout and thresholds, but open-drain RST/WDO outputs require external pullups | Suitable where level-shifting or wired-OR reset bus is needed; incompatible with direct drive of CMOS inputs without pullups | Select when system requires open-drain flexibility or shares reset bus with other devices |
| TPS3808G33DBVR | Single-supply supervisor only; no VCC2 or RSTIN inputs; fixed 3.3V threshold; no manual reset input | Limited to single-rail applications; lacks triple-monitoring capability and MR functionality of MAX6735AKAWGD3+T | Choose only for cost-sensitive, single-voltage designs where triple supervision is unnecessary |
Compared with MAX6734AKAWGD3+T, the MAX6735AKAWGD3+T's push-pull outputs reduce component count and simplify routing; versus TPS3808G33DBVR, it delivers triple-rail supervision, MR support, and adjustable monitoring-making it essential for complex multivoltage systems requiring robust fault coverage.
Availability
MAX6735AKAWGD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging nodes, and automotive ADAS modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6735AKAWGD3+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 was engineered specifically for high-reliability multivoltage microprocessor systems needing integrated triple-rail supervision, configurable watchdog behavior, and operation across harsh environmental conditions.
FAQ
What voltage thresholds does the MAX6735AKAWGD3+T monitor?
The MAX6735AKAWGD3+T monitors VCC1 at +3.075V, VCC2 at +1.665V, and RSTIN with a fixed 626mV internal reference-enabling precise supervision of a third supply via external resistor divider. These thresholds are factory-trimmed and guaranteed over –40°C to +125°C, with ±0.5% hysteresis and 20ppm/°C tempco.
Does the MAX6735AKAWGD3+T support manual reset functionality?
Yes, the MAX6735AKAWGD3+T includes an active-low manual reset input (MR) with an internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion and watchdog timer clear. The MR pin accepts standard CMOS logic levels and supports momentary switch interfaces without external debounce components.
What is the watchdog timeout behavior of the MAX6735AKAWGD3+T?
The MAX6735AKAWGD3+T implements a dual-mode watchdog: a 35s minimum startup delay after reset (to allow full system initialization), followed by a 1.12s minimum normal timeout period. The watchdog clears on any WDI edge and asserts WDO low if no transition occurs within the active timeout window.
How does the MAX6735AKAWGD3+T handle power supply transients?
The MAX6735AKAWGD3+T is immune to short VCC transients-rejecting glitches under 100ns duration per its Typical Operating Characteristics. Its reset comparators include built-in filtering and hysteresis, preventing false resets during brief supply dips common in switching regulator environments or hot-plug events.
What package type and pin count does the MAX6735AKAWGD3+T use?
The MAX6735AKAWGD3+T uses an 8-pin SOT23-8 package (K8S-3), with standardized footprint and thermal characteristics. Pinout is identical to MAX6734A variants, supporting drop-in compatibility where push-pull outputs are acceptable-verified in Maxim's official pin configuration diagrams and ordering information.
MAX6735AKAWGD3+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:
- 1.11V, 1.665V, 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
MAX6735AKAWGD3+T FAQ
1.How can I place an order for MAX6735AKAWGD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKAWGD3+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 MAX6735AKAWGD3+T reliable?
The price and inventory of MAX6735AKAWGD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKAWGD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735AKAWGD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKAWGD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKAWGD3+T?
MAX6735AKAWGD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKAWGD3+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 MAX6735AKAWGD3+T?
For technical support, including MAX6735AKAWGD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKAWGD3+T requirements.
6.How does Aetrix verify that MAX6735AKAWGD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735AKAWGD3+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 MAX6735AKAWGD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735AKAWGD3+T?
All MAX6735AKAWGD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKAWGD3+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 MAX6735AKAWGD3+T part is unused and in its original packaging.
Return procedure for MAX6735AKAWGD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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