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Analog Devices Inc./Maxim Integrated MAX6734KAYHD3+T
- Part No.:
- MAX6734KAYHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6734KAYHD3+T.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6734KAYHD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with active-low open-drain reset and watchdog outputs, monitoring VCC1 (2.925V nominal), VCC2 (2.188V nominal), and an adjustable RSTIN input (626mV threshold), featuring 210ms reset timeout and -40°C to +85°C operation. It ensures system reliability in multivoltage embedded systems by asserting reset on undervoltage or manual trigger.
For engineers reviewing the MAX6734KAYHD3+T datasheet, MAX6734KAYHD3+T pinout, MAX6734KAYHD3+T application, or MAX6734KAYHD3+T equivalent, this device delivers verified triple-supply monitoring, factory-set dual fixed thresholds, adjustable third-voltage supervision, independent watchdog with 35s startup/1.12s normal timeout, and SOT23-8 packaging for space-constrained industrial and telecom designs.
Technical Context
The MAX6734KAYHD3+T integrates three independent voltage monitors: two factory-trimmed comparators for VCC1 and VCC2 (YH suffix = 2.925V / 2.188V), plus a high-impedance RSTIN comparator referenced to a 626mV internal bandgap. Its reset logic asserts RST low when any monitored voltage falls below its threshold or MR is pulled low, holding for the D3 timeout (140–280ms).
The watchdog subsystem features dual-mode timing: a 35s minimum initial period after reset to accommodate boot sequences, then automatic transition to 1.12s minimum normal timeout upon first WDI edge detection. WDO operates as an open-drain output synchronized to watchdog state, independent of RST assertion timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 2.925V (Y suffix) - precisely monitors +3.3V I/O rails with ±1.5% tolerance and 20ppm/°C tempco |
| VCC2 Reset Threshold | 2.188V (H suffix) - targets +2.5V or +1.8V memory/core supplies with guaranteed hysteresis |
| RSTIN Threshold | 626.5mV (typ) - enables external resistive divider to supervise voltages down to 0.63V with <25nA input bias |
| Reset Timeout Period | 210ms (D3 option, typ) - provides sufficient hold time for complex μP initialization before release |
| Watchdog Timeout | 35s min startup / 1.12s min normal - prevents premature lockup detection during boot while enabling rapid fault response thereafter |
| Supply Current | 14μA (typ at +3.6V) - minimizes quiescent load on battery-backed or low-power systems |
| Operating Temp | -40°C to +85°C - fully specified for industrial-grade reliability without derating |
Pinout & Package
MAX6734KAYHD3+T is housed in an 8-pin SOT23 package (K8SN+1 outline), measuring 2.9mm × 1.6mm × 1.1mm, with exposed pad for thermal enhancement and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain driver requiring external pullup; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation |
| 2 - GND | Ground reference | Common return for all internal comparators, watchdog timer, and I/O; must be low-impedance |
| 3 - WDO | Active-low watchdog output | Open-drain watchdog status signal; deasserts only after valid WDI edges and stable supply conditions |
| 4 - VCC1 | Primary supply input | Powers internal circuitry and serves as reference for VCC1 monitor and MR pullup (50kΩ) |
| 5 - RSTIN | Adjustable reset comparator input | High-Z input referenced to 626mV; accepts divided-down voltages ≥0.63V with minimal loading |
| 6 - WDI | Watchdog input | Edge-sensitive control pin; clears watchdog timer on rising/falling transitions; unconnected = functional |
| 7 - MR | Active-low manual reset input | Internally pulled up to VCC1; drives reset when pulled low; 1µs minimum pulse width required |
| 8 - VCC2 | Secondary supply input | Input to second fixed-threshold monitor; powers comparator when VCC2 > VCC1, otherwise inactive |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors primary (VCC1), secondary (VCC2), and user-adjustable (RSTIN) rails with independent thresholds and hysteresis |
| Dual-mode watchdog timer | 35s startup delay enables full system boot before watchdog enforcement; transitions automatically to 1.12s normal timeout |
| Immunity to VCC transients | Rejects falling supply glitches ≤100ns at 100mV overdrive, eliminating false resets in noisy power environments |
| Guaranteed reset validity | Outputs remain functional down to VCC1 or VCC2 = +0.8V, ensuring reset integrity during brownout recovery |
| Low-power operation | 14μA typical supply current at +3.6V enables use in always-on supervisory paths without compromising battery life |
Applications
| Telecom Power Management | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring +3.3V control logic, +2.5V FPGA I/O, and +1.2V core voltage in a remote radio unit with cold-start requirements. IC Role / Device Role / Timing Role: Triple-supply supervisor enforcing coordinated reset sequencing and detecting rail collapse during RF burst transmission. Use Value: Prevents firmware corruption by asserting reset within 210ms of any rail dropping below 2.925V/2.188V/0.63V thresholds, with watchdog fallback if software hangs. |
Use Scenario: Supervising +5V analog front-end, +3.3V microcontroller, and +1.8V ADC supply in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Fault-detection hub providing deterministic reset initiation and watchdog-triggered fail-safe shutdown on processor lockup. Use Value: Ensures deterministic recovery from brownouts via 210ms timeout and eliminates silent failures using 1.12s watchdog timeout aligned to scan cycle timing. |
| Network Switch ASIC Boot | Medical Diagnostic Imaging |
Use Scenario: Validating +1.0V SerDes, +1.8V PHY, and +3.3V management CPU rails during cold boot of a 10G Ethernet switch ASIC. IC Role / Device Role / Timing Role: Triple-rail supervisor with adjustable RSTIN used to monitor auxiliary +1.0V supply via resistor divider, coordinating with ASIC boot ROM. Use Value: Enables precise supervision of nonstandard voltages (e.g., +1.0V) down to 0.63V with <25nA input leakage, preserving signal integrity on sensitive analog lines. |
Use Scenario: Securing power-up sequence for +5V motor drivers, +3.3V imaging sensor interface, and +1.2V FPGA configuration in portable ultrasound equipment. IC Role / Device Role / Timing Role: Safety-critical supervisor ensuring all subsystems initialize before enabling high-voltage transducer drivers. Use Value: Guarantees reset assertion remains valid down to +0.8V on any monitored rail, preventing partial initialization that could cause hazardous actuator motion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KALTD3+T | VCC1 = 4.375V / VCC2 = 2.625V (LT suffix); same D3 timeout, SOT23-8, open-drain outputs | Targets +5V logic and +3.3V I/O instead of +3.3V/+2.5V rails; unsuitable where YH thresholds are required | Select when supervising higher-voltage rails; verify compatibility with existing voltage divider networks on RSTIN |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN), 3.3V fixed threshold, push-pull RST, 200ms timeout, SOT23-6 | Lacks third adjustable monitor and independent watchdog output; smaller footprint but reduced supervision scope | Choose for cost-sensitive dual-rail applications without need for RSTIN flexibility or watchdog independence |
Compared with MAX6734KAYHD3+T, MAX6734KALTD3+T offers different fixed thresholds but identical triple-monitor architecture and watchdog behavior, while TPS3808G33DBVR reduces functionality to dual-rail supervision with no adjustable input-making it suitable only where RSTIN and independent WDO are unnecessary.
Availability
MAX6734KAYHD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, network switches, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6734KAYHD3+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 industrial, automotive, and communications applications, emphasizing reliability, low power, and integration.
The MAX6730–MAX6735 family was developed specifically for robust microprocessor supervision in multivoltage embedded systems, combining triple-rail monitoring, independent watchdogs, and ultra-low quiescent current in miniature packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6734KAYHD3+T?
The MAX6734KAYHD3+T has factory-set thresholds defined by the YH suffix: VCC1 = 2.925V (±1.5%) and VCC2 = 2.188V (±1.5%), both with 20ppm/°C tempco and 0.5% hysteresis. These values are laser-trimmed and guaranteed over -40°C to +85°C, matching the electrical characteristics table in the official datasheet.
Does the MAX6734KAYHD3+T support an adjustable third voltage monitor, and how is it implemented?
Yes, the MAX6734KAYHD3+T supports an adjustable third voltage monitor via the RSTIN pin, which compares the applied voltage against an internal 626.5mV (typ) reference. To supervise voltages above 626mV, connect a resistive divider from the target rail to RSTIN and GND; the MAX6734KAYHD3+T datasheet provides the exact formula for calculating resistor values.
What are the watchdog timeout periods for the MAX6734KAYHD3+T, and how do they operate?
The MAX6734KAYHD3+T features dual-mode watchdog timing: a 35s minimum initial timeout after reset (to allow full system boot), followed automatically by a 1.12s minimum normal timeout once the first valid WDI edge is detected. The watchdog output (WDO) asserts low if no edge occurs within the active timeout window, and clears immediately upon edge detection.
Is the reset output of the MAX6734KAYHD3+T push-pull or open-drain, and what does that mean for external circuitry?
The MAX6734KAYHD3+T has an open-drain RST output, requiring an external pullup resistor to the appropriate logic rail (e.g., VCC1 or host μP I/O voltage). This allows level-shifting and wired-OR configurations. Unlike push-pull versions, it cannot actively drive high-so the pullup value must be selected to meet rise-time and bus-loading requirements of the connected system.
What package type and environmental rating does the MAX6734KAYHD3+T use?
The MAX6734KAYHD3+T uses an 8-pin SOT23 package (K8SN+1 outline) with RoHS-compliant lead-free finish (+T suffix), rated for operation from -40°C to +85°C. It is not AEC-Q100 qualified-automotive variants like MAX6734KATGD3/V+T carry the /V suffix and undergo additional stress testing.
MAX6734KAYHD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6734KAYHD3+T FAQ
1.How can I place an order for MAX6734KAYHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KAYHD3+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 MAX6734KAYHD3+T reliable?
The price and inventory of MAX6734KAYHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KAYHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6734KAYHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KAYHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KAYHD3+T?
MAX6734KAYHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KAYHD3+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 MAX6734KAYHD3+T?
For technical support, including MAX6734KAYHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KAYHD3+T requirements.
6.How does Aetrix verify that MAX6734KAYHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6734KAYHD3+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 MAX6734KAYHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6734KAYHD3+T?
All MAX6734KAYHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KAYHD3+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 MAX6734KAYHD3+T part is unused and in its original packaging.
Return procedure for MAX6734KAYHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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