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Analog Devices Inc./Maxim Integrated MAX6734KASHD2-T
- Part No.:
- MAX6734KASHD2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6734KASHD2-T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,580
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Product details
Overview
MAX6734KASHD2-T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +3.075V (VCC1), +2.313V (VCC2), and an adjustable input down to +0.63V via RSTIN. It features open-drain RST and WDO outputs, 8.8ms minimum reset timeout, manual reset input, and operates across –40°C to +85°C - used in multivoltage embedded systems requiring reliable power-on and brownout detection.
For engineers reviewing the MAX6734KASHD2-T datasheet, MAX6734KASHD2-T pinout, MAX6734KASHD2-T application, or MAX6734KASHD2-T equivalent, key selection criteria include its dual fixed-threshold supervision (+3.075V/+2.313V), adjustable third-channel capability, 8.8ms reset timeout, open-drain watchdog output, and SOT23-8 package compatibility with space-constrained industrial and telecom designs.
Technical Context
The MAX6734KASHD2-T implements three independent voltage monitors: two factory-set comparators for VCC1 and VCC2 (T/Z suffix = +3.075V / +2.313V), plus a high-impedance RSTIN comparator referenced to 626mV. Its reset logic asserts active-low RST when any monitored supply falls below threshold or MR is pulled low, holding assertion for the D2 timeout period (8.8–17.6ms).
It integrates a dual-mode watchdog timer: 35s minimum startup delay after reset, then 1.12s minimum normal-mode timeout. WDI edge detection clears the timer; absence of transitions triggers active-low open-drain WDO. Both RST and WDO are open-drain, requiring external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +3.075V (T-suffix), guaranteed over –40°C to +85°C; ensures reliable reset at 3.3V rail brownout |
| VCC2 Threshold | +2.313V (Z-suffix), supports 2.5V or 2.4V secondary rail monitoring |
| RSTIN Threshold | +626mV ±15.5mV; enables adjustable third-voltage monitoring via resistive divider |
| Reset Timeout | D2 option: 8.8ms (min) to 17.6ms (max); balances fast recovery and noise immunity |
| Watchdog Timeout | 35s min startup delay, then 1.12s min normal mode; prevents premature lockup during boot |
| Supply Current | 15µA typ at +3.6V; enables battery-backed or ultra-low-power system supervision |
| Operating Temp | –40°C to +85°C; qualified for industrial-grade embedded equipment operation |
Pinout & Package
MAX6734KASHD2-T is housed in an 8-pin SOT23-8 package (package code K8SN-1), with 1.3mm × 2.1mm footprint and 0.65mm pitch - optimized for high-density PCB layouts in portable and telecom equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low open-drain reset output | Asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation; requires external pullup |
| 2 - GND | Ground reference | Common return path for all internal comparators and logic; must be low-impedance |
| 3 - WDO | Active-low open-drain watchdog output | Asserts low if WDI lacks edge for >1.12s (normal) or >35s (startup); enables system-level fault escalation |
| 4 - MR | Active-low manual reset input | Pulled up internally to VCC1 (50kΩ); drives RST low when asserted; debounced by design |
| 5 - WDI | Watchdog input | Edge-sensitive; rising/falling transitions reset watchdog timer; unconnected = functional default |
| 6 - VCC1 | Primary supply input | Power source and primary voltage monitor input (T-threshold = +3.075V) |
| 7 - RSTIN | Adjustable reset comparator input | High-impedance (±25nA), referenced to 626mV; monitors third rail via external resistor divider |
| 8 - VCC2 | Secondary supply input | Secondary voltage monitor input (Z-threshold = +2.313V); powers internal circuitry when >VCC1 |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors two fixed rails (VCC1/VCC2) and one user-adjustable rail (RSTIN), reducing BOM count vs. discrete solutions |
| Independent watchdog output | WDO operates separately from RST, enabling watchdog-triggered actions (e.g., log capture) without resetting CPU |
| Dual-mode watchdog timer | 35s startup delay allows full system initialization before watchdog enforcement begins |
| Immunity to short VCC transients | Rejects glitches <100ns duration; eliminates false resets in noisy power environments |
| Low quiescent current | 15µA typical at +3.6V enables use in always-on supervisory paths without impacting battery life |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring +3.3V core, +2.5V I/O, and +1.2V FPGA auxiliary rails in a base station control card. IC Role / Device Role / Timing Role: MAX6734KASHD2-T acts as centralized voltage supervisor, asserting RST only after all three rails stabilize above thresholds and hold for 8.8ms. Use Value: Prevents firmware execution on partially powered subsystems, eliminating configuration corruption during cold start. |
Use Scenario: Supervising +24V DC-DC converted rails (+3.3V, +5V) and isolated sensor supply (+3.0V) in modular I/O backplane. IC Role / Device Role / Timing Role: MAX6734KASHD2-T provides coordinated reset release and independent WDO signaling to watchdog MCU peripherals. Use Value: Enables deterministic power-up sequence and early fault isolation without adding discrete comparators or timers. |
| Network Router Line Cards | Medical Diagnostic Imaging Subsystems |
|
Use Scenario: Ensuring stable operation of multi-core SoC, DDR memory, and PHY interfaces under variable load conditions. IC Role / Device Role / Timing Role: MAX6734KASHD2-T monitors SoC core (+1.1V via RSTIN divider), I/O (+3.3V), and analog supply (+2.5V), with WDO tied to FPGA health monitor. Use Value: Guarantees clean boot and runtime lockup recovery while minimizing board area versus dual-supervisor solutions. |
Use Scenario: Supervising imaging ASIC core (+1.8V), ADC reference (+2.048V), and motor driver supply (+12V) in portable ultrasound units. IC Role / Device Role / Timing Role: MAX6734KASHD2-T uses RSTIN to track +2.048V reference via precision divider, ensuring ADC accuracy before data acquisition. Use Value: Eliminates need for dedicated reference supervisor IC, reducing cost and thermal load in thermally sensitive enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KASHD3-T | Same package and supervision architecture, but D3 reset timeout (140–280ms) instead of D2 (8.8–17.6ms) | Better suited for systems requiring longer reset hold time to accommodate slow power-rail settling | Select MAX6734KASHD3-T if timing margins demand >100ms reset assertion; otherwise MAX6734KASHD2-T offers faster recovery. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no RSTIN or dual fixed thresholds; push-pull RST; no independent WDO | Lacks triple-monitoring and adjustable input; suitable only for single-rail applications without watchdog escalation needs | Choose TPS3808G33DBVR only for cost-sensitive, single-voltage designs where RSTIN and WDO independence are unnecessary. |
Compared with MAX6734KASHD3-T and TPS3808G33DBVR, the MAX6734KASHD2-T uniquely delivers triple-voltage supervision with factory-set +3.075V/+2.313V thresholds, adjustable third channel, and independent open-drain WDO - making it optimal for compact, multirail industrial and telecom systems requiring precise timing and fault isolation.
Availability
MAX6734KASHD2-T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6734KASHD2-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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6730–MAX6735 family was engineered specifically for robust, multivoltage microprocessor supervision in space-constrained embedded systems - emphasizing low power, glitch immunity, and flexible reset/watchdog timing.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6734KASHD2-T?
The MAX6734KASHD2-T uses the 'T' suffix for VCC1 and 'Z' suffix for VCC2, corresponding to nominal reset thresholds of +3.075V (VCC1) and +2.313V (VCC2), with ±75mV tolerance over temperature. These values are factory-trimmed and specified in the Electrical Characteristics table of the MAX6734KASHD2-T datasheet.
Does the MAX6734KASHD2-T support an adjustable third voltage monitoring input?
Yes, the MAX6734KASHD2-T includes the RSTIN pin, which features a precision 626mV internal reference. By connecting a resistive voltage divider from a higher-voltage rail to RSTIN and ground, designers can monitor any supply from +0.63V up to VCC1 - a capability exclusive to the MAX6734/MAX6735 variants.
What is the function of the WDO pin on the MAX6734KASHD2-T?
The WDO (Watchdog Output) pin on the MAX6734KASHD2-T is an active-low, open-drain signal that asserts when the watchdog timer expires due to missing edges on WDI. Unlike RST, WDO operates independently - allowing system-level fault logging or safe state entry without forcing a full processor reset.
How does the manual reset (MR) input interact with the watchdog timer in the MAX6734KASHD2-T?
Asserting MR low on the MAX6734KASHD2-T immediately clears the watchdog timer, deasserts WDO, and forces RST low for the full D2 timeout period (8.8–17.6ms) after MR is released. This provides synchronized reset initiation and watchdog reset - critical for test modes and field service recovery sequences.
Is the MAX6734KASHD2-T compatible with 1.8V or 2.5V logic levels on the MR and WDI inputs?
Yes, the MAX6734KASHD2-T accepts standard CMOS/TTL logic levels on MR and WDI: VIH ≥ 0.7 × VCC1 and VIL ≤ 0.3 × VCC1. Since VCC1 is typically +3.3V, this supports 1.8V and 2.5V logic families directly - no level-shifting required - provided VCC1 remains within 0.8V to 5.5V operating range.
MAX6734KASHD2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.313V, 2.925V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 8.8ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6734KASHD2-T FAQ
1.How can I place an order for MAX6734KASHD2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KASHD2-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 MAX6734KASHD2-T reliable?
The price and inventory of MAX6734KASHD2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KASHD2-T is usually 5 days.
3.What payment methods are accepted for MAX6734KASHD2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KASHD2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KASHD2-T?
MAX6734KASHD2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KASHD2-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 MAX6734KASHD2-T?
For technical support, including MAX6734KASHD2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KASHD2-T requirements.
6.How does Aetrix verify that MAX6734KASHD2-T is sourced from the original manufacturer or authorized distributors?
All MAX6734KASHD2-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 MAX6734KASHD2-T meets industry standards.
7.What is the process for return or replacement of MAX6734KASHD2-T?
All MAX6734KASHD2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KASHD2-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 MAX6734KASHD2-T part is unused and in its original packaging.
Return procedure for MAX6734KASHD2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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