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Analog Devices Inc./Maxim Integrated MAX6735KATGD3+
- Part No.:
- MAX6735KATGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KATGD3+.pdf
- Description:
- MAX6735 TRIPLE-VOLTAGE MICROPROC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX6735KATGD3+ 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, 140ms–280ms reset timeout (D3), manual reset input, and operates across –40°C to +85°C. Used in multivoltage embedded systems requiring reliable power-on reset and processor lockup protection.
For engineers reviewing the MAX6735KATGD3+ datasheet, MAX6735KATGD3+ pinout, MAX6735KATGD3+ application, or MAX6735KATGD3+ equivalent, key selection criteria include its dual fixed-threshold supervision (+3.075V/+1.665V), third adjustable threshold (626mV reference), push-pull active-low outputs, 140–280ms reset timeout, and SOT23-8 package compatibility with space-constrained industrial and telecom designs.
Technical Context
The MAX6735KATGD3+ implements three independent voltage monitoring paths: VCC1 monitored at +3.075V nominal (±1.5% over temperature), VCC2 at +1.665V nominal (±1.5%), and RSTIN referenced to a precision 626mV internal bandgap comparator. Its dual-mode watchdog timer provides a 35s minimum startup delay after reset and a 1.12s minimum normal-mode timeout, triggered by WDI edge transitions.
Reset assertion is guaranteed down to VCC1 or VCC2 = +0.8V, with <45µs VCC-to-RST propagation delay and <22µs RSTIN-to-RST delay. The device draws only 14µA typical supply current at +3.6V and maintains immunity to sub-100ns VCC transients when overdrive exceeds 100mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +3.075V (nominal), ±1.5% tolerance - sets precise brownout detection for primary 3.3V rail |
| VCC2 Threshold | +1.665V (nominal), ±1.5% tolerance - monitors secondary 1.8V or core logic supply |
| RSTIN Reference | 626mV internal comparator - enables external resistor-divider to monitor voltages up to 5.5V |
| Reset Timeout | 140ms–280ms (D3 option) - ensures sufficient hold time for full system initialization |
| Watchdog Timeout | 35s min startup / 1.12s min normal mode - accommodates boot sequences then enforces tight runtime supervision |
| Supply Current | 14µA typical at +3.6V - minimizes quiescent load on battery-backed or low-power rails |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded equipment deployment |
Pinout & Package
The MAX6735KATGD3+ is housed in an 8-pin SOT23-8 package (package code K85N-1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output - drives µP reset pin directly without external pullup; asserts during VCC1/VCC2/RSTIN undervoltage or MR activation |
| 2 | GND | Ground reference - common return path for all internal comparators and outputs |
| 3 | VCC2 | Secondary supply input - powers internal circuitry when > VCC1; monitored at +1.665V threshold |
| 4 | MR | Active-low manual reset input - internal 50kΩ pullup to VCC1; 1µs minimum pulse width required |
| 5 | WDI | Watchdog input - edge-sensitive; clears watchdog timer on rising/falling transition; floating disables no function |
| 6 | VCC1 | Primary supply input - powers device when > VCC2; monitored at +3.075V threshold |
| 7 | RSTIN | Adjustable reset comparator input - high-impedance (±25nA bias) node referenced to 626mV; accepts resistive divider for third-rail monitoring |
| 8 | WDO | Active-low push-pull watchdog output - asserts independently of RST when WDI stalls beyond timeout; deasserts immediately upon valid WDI edge |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors two factory-set rails (+3.075V, +1.665V) and one user-adjustable rail via RSTIN - eliminates need for discrete supervisors in multirail systems |
| Independent watchdog output | WDO operates separately from RST, enabling distinct fault responses (e.g., log error vs. full reset) - supports fail-safe system recovery strategies |
| Dual-mode watchdog timer | 35s startup delay prevents false timeout during boot; 1.12s runtime timeout ensures rapid detection of software hangs - balances initialization safety with runtime responsiveness |
| Guaranteed reset validity to +0.8V | Ensures clean reset assertion even during deep brownout conditions - critical for deterministic recovery in unregulated or battery-depleted systems |
| Low-glitch immunity | Rejects VCC transients <100ns at 100mV overdrive - prevents spurious resets in noisy power environments without external filtering |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Monitors 3.3V I/O, 1.8V FPGA core, and 12V DC-DC feedback rail in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Triple-supply supervisor providing coordinated reset and independent watchdog signaling to ARM Cortex-M7 MCU and FPGA configuration logic. Use Value: Prevents partial initialization failures by holding reset until all three rails stabilize; WDO triggers firmware-level diagnostics without resetting communication interfaces. |
Use Scenario: Supervises +3.3V management ASIC supply, +1.65V SerDes core, and +5V auxiliary bias rail in a 10Gbps optical line card. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcer ensuring deterministic boot and runtime integrity of high-speed serial links. Use Value: D3 timeout (140–280ms) aligns with SerDes PLL lock time; push-pull outputs drive multiple reset domains without level-shifting. |
| Medical Imaging Sensor Node | Automotive ADAS Camera Module |
Use Scenario: Validates 3.075V image sensor analog supply, 1.665V ISP core voltage, and adjustable 2.5V ADC reference in a portable ultrasound probe. IC Role / Device Role / Timing Role: Fault-detection hub asserting reset on any rail collapse and feeding watchdog status to safety-critical firmware. Use Value: 14µA quiescent current extends battery life; RSTIN's 626mV reference enables accurate scaling for 2.5V rail monitoring with minimal external components. |
Use Scenario: Supervises 3.3V camera SoC I/O, 1.665V vision processor core, and adjustable 1.2V DDR termination supply in an AEC-Q200 qualified rear-view camera. IC Role / Device Role / Timing Role: Automotive-grade voltage supervisor with extended temperature range and glitch-immune reset generation. Use Value: –40°C to +85°C operation ensures reliability in under-hood thermal cycling; push-pull RST/WDO eliminate external pullups, reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KATGD3+ | Same pinout and thresholds, but open-drain RST/WDO outputs - requires external pullup resistors | Suitable where reset signal must be shared across multiple devices on a wired-OR bus | Select MAX6734KATGD3+ only if open-drain topology is required for bus arbitration; otherwise MAX6735KATGD3+ simplifies layout with push-pull drive. |
| TPS3808G33DBVR | Dual-voltage supervisor (3.3V/1.8V only); no adjustable RSTIN input; 200ms fixed timeout; SOT23-6 package | Lacks third-rail monitoring capability and manual reset input - insufficient for triple-supply systems | Choose TPS3808G33DBVR only for cost-sensitive dual-rail applications without adjustable monitoring or MR requirement. |
Compared with MAX6734KATGD3+, the MAX6735KATGD3+ delivers direct-drive reset capability without external components; versus TPS3808G33DBVR, it adds critical third-rail supervision and manual reset - making it the only validated solution for compact triple-voltage industrial and telecom designs requiring guaranteed reset down to +0.8V.
Availability
The MAX6735KATGD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging nodes, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6735KATGD3+ 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 MAX6730–MAX6735 family was designed to replace discrete reset circuits in multivoltage microprocessor systems, integrating triple-rail supervision, manual reset, and independent watchdog functionality into ultra-small SOT23 packages.
FAQ
What are the exact factory-set voltage thresholds for MAX6735KATGD3+?
The MAX6735KATGD3+ has VCC1 threshold set to +3.075V (T suffix) and VCC2 threshold set to +1.665V (W suffix), per Maxim's Reset Voltage Threshold Suffix Guide. These values are laser-trimmed at wafer test and guaranteed over –40°C to +85°C with ±1.5% tolerance. The RSTIN input uses a fixed 626mV internal reference for adjustable third-rail monitoring.
Does MAX6735KATGD3+ support manual reset functionality?
Yes, the MAX6735KATGD3+ includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion and watchdog timer clear. The MR pin accepts TTL/CMOS logic levels and requires only a 1µs minimum pulse width. It remains functional across the full –40°C to +85°C operating range.
What is the reset timeout period for MAX6735KATGD3+ and how is it selected?
The MAX6735KATGD3+ uses the D3 suffix, specifying a reset timeout period of 140ms (min) to 280ms (max). This value is factory-programmed and non-adjustable. The timeout begins when all monitored voltages (VCC1, VCC2, RSTIN) exceed their thresholds and ends after the full interval, ensuring robust release timing for complex system initialization sequences.
How does the watchdog timer operate in MAX6735KATGD3+ during power-up?
The MAX6735KATGD3+ implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enters a 35s minimum startup mode to allow full system boot. Once the first valid WDI edge occurs, it switches to 1.12s minimum normal-mode timeout. This prevents false watchdog timeouts during initialization while maintaining tight runtime supervision.
Is MAX6735KATGD3+ compatible with bidirectional µP reset pins?
Yes, the MAX6735KATGD3+'s push-pull RST output can interface with bidirectional µP reset pins, but a 10kΩ series resistor is recommended between RST and the µP pin to prevent logic contention during direction changes. This configuration ensures safe driving during reset assertion and avoids conflict when the µP attempts to drive the line low during debug or recovery sequences.
MAX6735KATGD3+ 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:
- 1.11V, 3.075V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735KATGD3+ FAQ
1.How can I place an order for MAX6735KATGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KATGD3+ 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 MAX6735KATGD3+ reliable?
The price and inventory of MAX6735KATGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KATGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6735KATGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KATGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KATGD3+?
MAX6735KATGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KATGD3+ 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 MAX6735KATGD3+?
For technical support, including MAX6735KATGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KATGD3+ requirements.
6.How does Aetrix verify that MAX6735KATGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6735KATGD3+ 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 MAX6735KATGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6735KATGD3+?
All MAX6735KATGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KATGD3+, 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 MAX6735KATGD3+ part is unused and in its original packaging.
Return procedure for MAX6735KATGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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