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Analog Devices Inc./Maxim Integrated MAX6735KAWGD3+
- Part No.:
- MAX6735KAWGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KAWGD3+.pdf
- Description:
- TRIPLE-VOLTAGE MICROPROCESSOR SU
- Quantity:
- Payment:
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Product details
Overview
MAX6735KAWGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+4.625V nominal), VCC2 (+3.075V nominal), and an adjustable RSTIN input (626mV threshold). It features push-pull reset and watchdog outputs, 140–280ms reset timeout, manual reset input, and operates over –40°C to +85°C in SOT23-8 package. Used in multivoltage telecom and industrial systems for reliable power-on reset and lockup recovery.
For engineers reviewing the MAX6735KAWGD3+ datasheet, MAX6735KAWGD3+ pinout, MAX6735KAWGD3+ application, or MAX6735KAWGD3+ equivalent, key selection criteria include its dual fixed-voltage thresholds (VCC1/VCC2), third adjustable monitoring channel, push-pull RST/WDO drive capability, 140ms minimum reset timeout, and guaranteed reset validity down to VCC = +0.8V - critical for brownout resilience in battery-powered and embedded control designs.
Technical Context
The MAX6735KAWGD3+ implements a triple-supply supervision architecture: two factory-set comparators monitor VCC1 and VCC2 (here +4.625V and +3.075V per suffix "AW"), while a high-impedance RSTIN comparator monitors a third voltage via external resistor divider referenced to 626mV. Its dual-mode watchdog timer provides 35s startup delay followed by 1.12s normal timeout, synchronized to WDI edges.
Reset assertion is triggered by any monitored supply falling below its threshold, RSTIN dropping below 626mV, or MR low pulse; RST remains asserted for the full D3 timeout (140–280ms) after all conditions clear. The push-pull RST and WDO outputs eliminate need for external pullups and support direct interfacing with bidirectional μP reset pins when used with a 10kΩ series resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +0.8V to +5.5V on VCC1/VCC2 - ensures valid reset operation during deep brownout conditions. |
| VCC1 Reset Threshold | +4.625V (±125mV) - factory-set for primary 4.5V–5V rail supervision (suffix "A") |
| VCC2 Reset Threshold | +3.075V (±75mV) - factory-set for secondary 3.3V rail supervision (suffix "W") |
| RSTIN Threshold | +626mV (±15.5mV) - enables precise monitoring of third voltage (e.g., 1.2V, 1.8V) via resistive divider. |
| Reset Timeout Period | 140–280ms (D3 option) - provides sufficient hold time for complex processor initialization sequences. |
| Watchdog Timeout | 35s min startup / 1.12s min normal mode - accommodates boot firmware execution before enabling fast fault detection. |
| Supply Current | 15µA typ at +3.6V - minimizes quiescent load in always-on power domains. |
| Operating Temperature | –40°C to +85°C - fully specified for industrial-grade reliability without derating. |
Pinout & Package
MAX6735KAWGD3+ is housed in an 8-pin SOT23-8 package (JEDEC MO-178AA), footprint-compatible with industry-standard 1.6mm × 2.9mm land pattern (Maxim land pattern 90-0176), with 0.65mm pitch and exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output - drives low during fault or MR assertion; no external pullup required; compatible with bidirectional μP reset I/O via 10kΩ series resistor. |
| 2 | GND | System ground reference - shared return path for all internal comparators and outputs. |
| 3 | WDO | Active-low push-pull watchdog output - asserts low on WDI timeout or undervoltage; deasserts immediately upon valid WDI edge or threshold recovery. |
| 4 | VCC1 | Primary supply input - powers device and serves as reference for VCC1 threshold comparator and internal circuitry. |
| 5 | RSTIN | Adjustable reset comparator input - high-impedance (±25nA) node referenced to 626mV; accepts divided-down voltages up to VCC1. |
| 6 | WDI | Watchdog input - edge-sensitive (rising/falling); clears watchdog timer on each transition; unconnected state does not disable watchdog. |
| 7 | MR | Active-low manual reset input - internally pulled up to VCC1 (50kΩ); asserts RST and clears watchdog on logic-low pulse ≥1µs. |
| 8 | VCC2 | Secondary supply input - powers secondary comparator and contributes to device biasing when > VCC1. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1 (+4.625V), VCC2 (+3.075V), and RSTIN (626mV reference) - eliminates need for three discrete supervisors in multirail systems. |
| Push-pull RST and WDO outputs | Eliminates external pullup resistors and reduces BOM count; supports direct connection to μP reset I/O with minimal interface components. |
| Dual-mode watchdog timer | 35s startup delay allows full system boot before enabling 1.12s fault-detection window - prevents false resets during initialization. |
| Manual reset with glitch immunity | 1µs minimum MR pulse width and 100ns glitch rejection enable robust pushbutton or logic-driven reset without external debouncing. |
| Low supply current | 15µA typical at +3.6V - extends battery life in portable equipment and reduces self-heating in thermally constrained layouts. |
| Brownout-immune reset | Guaranteed RST validity down to VCC1/VCC2 = +0.8V - ensures deterministic reset behavior during gradual power collapse. |
Applications
| Telecom Power Management | Industrial PLC Controller |
|---|---|
|
Use Scenario: Monitoring +48V DC-DC derived rails (+5V, +3.3V, +1.2V) in base station power modules where multiple voltage domains must sequence and remain stable. IC Role / Device Role / Timing Role: Triple-supervisor enforces power-good sequencing, detects undervoltage on any rail, and triggers system reset within 280ms if fault persists. Use Value: Prevents corrupted firmware execution due to marginal VDD levels; eliminates need for discrete comparators and RC timers, reducing board area by >40%. |
Use Scenario: Ensuring deterministic restart after brownout in programmable logic controller CPU boards operating in factory-floor environments with noisy 24V DC supplies. IC Role / Device Role / Timing Role: Supervises main 5V logic rail, 3.3V I/O rail, and 1.2V FPGA core rail; MR input enables front-panel reset button; watchdog guards against firmware hangs. Use Value: Guarantees reset assertion even if VCC drops to +0.8V - critical for maintaining safe state in safety-critical automation systems. |
| Network Router Board | Medical Diagnostic Device |
|
Use Scenario: Validating power integrity across CPU, memory, and PHY voltage domains in multi-Gbps Ethernet routers with tight thermal constraints. IC Role / Device Role / Timing Role: Monitors +1.8V memory, +3.3V PHY, and +4.625V management rail; push-pull RST interfaces directly with ARM Cortex-A processor reset pin. Use Value: 15µA supply current minimizes standby power draw; 140ms reset timeout aligns with DDR initialization timing requirements. |
Use Scenario: Providing fail-safe power-on reset and runtime watchdog for embedded controller in ultrasound imaging equipment requiring FDA-compliant reliability. IC Role / Device Role / Timing Role: Supervises +5V analog front-end, +3.3V digital core, and +1.8V ADC reference; MR input supports service-mode reset; watchdog verifies real-time DSP thread liveness. Use Value: AEC-Q100 qualified variants available; 20ppm/°C tempco ensures threshold stability across clinical operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KAWGD3+ | Same VCC1/VCC2 thresholds and D3 timeout, but open-drain RST/WDO outputs - requires external pullups. | Suitable where level-shifting or wired-OR reset bus is needed; incompatible with direct push-pull μP reset pin interface. | Select MAX6734KAWGD3+ only if system design mandates open-drain reset signaling or shares reset line with other supervisors. |
| TPS3808G33DBVR | Dual-supply supervisor (no RSTIN), fixed 3.3V threshold, 200ms timeout, push-pull RST, no watchdog output - lacks third monitoring channel and watchdog functionality. | Applicable only for simpler dual-rail systems without watchdog requirement or adjustable voltage monitoring. | Choose TPS3808G33DBVR only when third voltage supervision and independent watchdog are unnecessary - avoids overdesign and cost premium. |
Compared with MAX6734KAWGD3+, the MAX6735KAWGD3+ delivers higher drive strength and simplified layout via push-pull outputs; versus TPS3808G33DBVR, it adds essential RSTIN-based third-rail monitoring and watchdog capability - making it the only choice for robust triple-rail, fault-recovery-critical applications.
Availability
MAX6735KAWGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, network routing hardware, and medical diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6735KAWGD3+ 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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6730–MAX6735 family was designed specifically for high-reliability microprocessor supervision in multivoltage embedded systems - integrating triple-rail monitoring, configurable reset timing, and independent watchdog functionality into space-constrained SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735KAWGD3+?
The MAX6735KAWGD3+ has factory-set VCC1 reset threshold of +4.625V (±125mV) and VCC2 reset threshold of +3.075V (±75mV), as indicated by the "AW" suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over –40°C to +85°C and feature 20ppm/°C tempco for stable performance across temperature.
Does the MAX6735KAWGD3+ support monitoring a third voltage, and how is it configured?
Yes, the MAX6735KAWGD3+ supports third-voltage monitoring via the RSTIN pin, which has a fixed 626mV internal reference. To monitor voltages above 626mV (e.g., 1.2V, 1.8V, 3.3V), connect a resistive divider between the target rail and GND, with the midpoint fed to RSTIN. The MAX6735KAWGD3+ datasheet provides the formula VEXT_TH = 626mV × (R1 + R2)/R2 for threshold calculation.
What are the watchdog timeout periods supported by the MAX6735KAWGD3+?
The MAX6735KAWGD3+ features a dual-mode watchdog: a minimum 35-second startup timeout after reset (to allow full system initialization), followed by a minimum 1.12-second normal-mode timeout during steady-state operation. Both periods are guaranteed over temperature and supply voltage, and the timer clears on any WDI edge - ensuring responsive fault detection without false triggers.
Is the MAX6735KAWGD3+ compatible with bidirectional microprocessor reset pins?
Yes, the MAX6735KAWGD3+ 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 while preserving MAX6735KAWGD3+'s ability to force reset during power faults or watchdog timeouts.
What package type and footprint does the MAX6735KAWGD3+ use?
The MAX6735KAWGD3+ uses an 8-pin SOT23-8 package (JEDEC MO-178AA), measuring 1.6mm × 2.9mm with 0.65mm lead pitch. Its land pattern matches Maxim's standard 90-0176 footprint, and it is RoHS-compliant with lead(Pb)-free terminations ("+" suffix). Thermal resistance is θJA = 180°C/W on a 4-layer board.
MAX6735KAWGD3+ 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, 1.665V, 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
MAX6735KAWGD3+ FAQ
1.How can I place an order for MAX6735KAWGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KAWGD3+ 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 MAX6735KAWGD3+ reliable?
The price and inventory of MAX6735KAWGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KAWGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6735KAWGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KAWGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KAWGD3+?
MAX6735KAWGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KAWGD3+ 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 MAX6735KAWGD3+?
For technical support, including MAX6735KAWGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KAWGD3+ requirements.
6.How does Aetrix verify that MAX6735KAWGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6735KAWGD3+ 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 MAX6735KAWGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6735KAWGD3+?
All MAX6735KAWGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KAWGD3+, 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 MAX6735KAWGD3+ part is unused and in its original packaging.
Return procedure for MAX6735KAWGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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