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Analog Devices Inc./Maxim Integrated MAX6734AKASHD3+T
- Part No.:
- MAX6734AKASHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6734AKASHD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
MAX6734AKASHD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring two factory-set supply rails (VCC1 = +2.925V, VCC2 = +2.188V) and one adjustable input (RSTIN = 626mV threshold), featuring 210ms reset timeout, open-drain RST/WDO outputs, and manual reset input - deployed in multivoltage embedded systems requiring reliable power-on reset and lockup protection.
For engineers reviewing the MAX6734AKASHD3+T datasheet, MAX6734AKASHD3+T pinout, MAX6734AKASHD3+T application, or MAX6734AKASHD3+T equivalent, this page delivers verified electrical parameters, temperature-stable threshold behavior, watchdog startup/normal timing modes, SOT23-8 package layout, and real-world substitution guidance for industrial and telecom power supervision designs.
Technical Context
The MAX6734AKASHD3+T implements dual-mode watchdog logic: a 35s minimum initial timeout after reset enables full system initialization, followed by 1.12s minimum normal-mode timeout for rapid fault detection. Its triple-monitor architecture uses internal references to validate VCC1 (2.925V), VCC2 (2.188V), and RSTIN (626mV), with hysteresis of 0.5% and tempco of 20ppm/°C.
Reset assertion occurs when any monitored voltage falls below its threshold; RST remains low for 210ms after all thresholds are re-exceeded. The device guarantees valid reset down to VCC1/VCC2 = +0.8V and features 100ns MR glitch rejection, 200ns MR-to-RST delay, and immunity to sub-10µs VCC transients at ≥75mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +2.925V nominal (S suffix), ±1.5% tolerance over -40°C to +125°C - sets primary supply monitoring point for 3.3V rail supervision |
| VCC2 Threshold | +2.188V nominal (Y suffix), ±1.5% tolerance - configures secondary supply monitor for 2.5V or 2.2V domain |
| RSTIN Threshold | 626mV typical, ±2.5mV max deviation - enables precise third-rail monitoring via external resistor divider |
| Reset Timeout | 210ms nominal (D3 suffix), 140–280ms range - ensures sufficient hold time for slow-starting µPs and peripherals |
| Supply Current | 14µA typical at +3.6V, <28µA max over full temperature range - supports battery-backed and ultra-low-power applications |
| Watchdog Timeout | 35s min initial period, 1.12s min normal period - balances boot-time flexibility with runtime responsiveness |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom base station environments |
Pinout & Package
MAX6734AKASHD3+T is housed in an 8-pin SOT23-8 package (K8S-3), measuring 3.00 × 1.75 × 1.30 mm, with gull-wing leads, JEDEC MO178 BA-compliant outline, and lead-free +T marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output requiring external pullup; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog, and reset logic |
| 3 - VCC2 | Secondary supply input | Power source and monitoring input for second voltage rail (e.g., 2.5V I/O domain) |
| 4 - WDO | Active-low watchdog output | Open-drain watchdog alert; asserts low if WDI lacks edge within timeout or during undervoltage |
| 5 - VCC1 | Primary supply input | Main power source and monitoring input for primary rail (e.g., 3.3V core) |
| 6 - RSTIN | Adjustable reset comparator input | High-impedance (±100nA) input referenced to 626mV; monitors third rail via resistive divider |
| 7 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; forces reset when pulled low |
| 8 - WDI | Watchdog input | Edge-sensitive input; clears watchdog timer on rising/falling transition; floating = active watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout - eliminates false triggers during boot while ensuring fast lockup response |
| Triple independent voltage monitoring | VCC1 (2.925V), VCC2 (2.188V), RSTIN (626mV) - supports complex multirail systems without external comparators |
| Guaranteed reset validity down to +0.8V | Functional reset assertion even as VCC1/VCC2 decay to 0.8V - ensures last-chance system recovery before brownout |
| 100ns MR glitch rejection | Rejects noise spikes shorter than 100ns on manual reset line - prevents spurious resets in noisy industrial environments |
| Immunity to short VCC transients | No reset issued for falling transients ≤10µs at 75mV overdrive - maintains stability during switching regulator ripple |
Applications
| Telecom Line Card Power Supervision | Industrial PLC CPU Module |
|---|---|
Use Scenario: Monitoring +3.3V management rail, +2.5V I/O rail, and +1.2V FPGA core rail in a carrier-grade line card with hot-swap capability. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting synchronized reset across µP, FPGA, and PHY; watchdog guards against firmware hang during packet processing. Use Value: Eliminates need for three discrete supervisors and external RC timing network, reducing BOM count by 4 components and PCB area by >12mm². |
Use Scenario: Ensuring deterministic restart after brownout in a DIN-rail mounted programmable logic controller with isolated 24V DC input and multiple internal DC-DC rails. IC Role / Device Role / Timing Role: Primary reset generator with manual reset button interface and watchdog-triggered fail-safe shutdown via MR-WDO loopback. Use Value: 210ms reset timeout aligns with PLC boot sequence; -40°C to +125°C rating ensures operation inside sealed enclosures near motor drives. |
| Set-Top Box Mainboard | Portable Medical Monitor |
Use Scenario: Supervising +5V USB peripheral rail, +3.3V SoC rail, and +1.8V memory rail in a consumer STB with HDMI, Wi-Fi, and USB host functions. IC Role / Device Role / Timing Role: Centralized reset coordination and watchdog enforcement for ARM-based media processor; RSTIN monitors DDR termination voltage. Use Value: Open-drain RST/WDO outputs interface directly with level-shifted SoC reset pins; 14µA quiescent current extends standby battery life. |
Use Scenario: Managing power sequencing and fault recovery in a battery-powered ECG monitor with analog front-end, ADC, and Bluetooth LE radio. IC Role / Device Role / Timing Role: Critical reset arbiter for low-voltage operation; RSTIN tracks buck converter output feeding precision analog circuitry. Use Value: 626mV RSTIN threshold enables accurate monitoring of 1.2V analog rail using only two 1% resistors; guaranteed operation at 0.8V VCC allows graceful shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKASVD3+T | VCC2 threshold = +1.575V (V suffix) instead of +2.188V (Y); same RSTIN, D3 timeout, SOT23-8 package | Better suited for dual-rail systems with 1.8V/1.5V domains (e.g., LPDDR2 memory + low-power MCU) | Select when secondary supply is ≤1.6V; verify RSTIN divider ratio accommodates lower VCC2 headroom |
| MAX6735AKASHD3+T | Push-pull RST/WDO outputs instead of open-drain; identical thresholds, timeout, and pinout | Eliminates need for external pullups; preferred where reset signal must drive multiple loads or high-capacitance buses | Choose for simplified layout in dense PCBs or when interfacing with push-pull-only µP reset inputs |
Compared with MAX6734AKASHD3+T, MAX6734AKASVD3+T shifts VCC2 monitoring lower for sub-1.8V systems, while MAX6735AKASHD3+T replaces open-drain outputs with push-pull - both retain identical watchdog behavior, temperature range, and RSTIN functionality, enabling direct substitution with minor schematic adjustments.
Availability
MAX6734AKASHD3+T is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, set-top boxes, and portable medical monitors requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6734AKASHD3+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 multivoltage µP supervision in space-constrained, high-reliability systems - delivering integrated triple monitoring, dual-mode watchdog, and extended temperature operation in minimal SOT23 footprints.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6734AKASHD3+T?
The MAX6734AKASHD3+T has a VCC1 reset threshold of +2.925V (S suffix) and VCC2 threshold of +2.188V (Y suffix), both with ±1.5% tolerance over -40°C to +125°C. These values are factory-trimmed and specified in Table 1 of the datasheet; the "SH" suffix in the part number directly encodes this combination.
Does MAX6734AKASHD3+T support manual reset, and how is it implemented?
Yes, MAX6734AKASHD3+T includes an active-low manual reset input (MR) on pin 7. It features a 50kΩ internal pullup to VCC1, accepts CMOS logic levels, and requires a minimum 1µs pulse width. Driving MR low forces RST assertion for the full 210ms timeout period, making it ideal for front-panel reset buttons or test-mode entry.
How does the watchdog timer behave during power-up of MAX6734AKASHD3+T?
Upon power-up or reset assertion, MAX6734AKASHD3+T enters a 35s minimum initial watchdog mode (tWD-L), allowing ample time for system initialization. After the first valid WDI edge or expiration of tWD-L, it switches to 1.12s minimum normal mode (tWD-S). This dual-mode architecture prevents premature timeouts during boot while ensuring rapid response to runtime hangs.
Can MAX6734AKASHD3+T monitor a 1.2V supply rail, and if so, how?
Yes, MAX6734AKASHD3+T can monitor a 1.2V rail using the RSTIN pin (pin 6), which has a fixed 626mV internal reference. Connect a resistive divider (e.g., R1 = 110kΩ, R2 = 120kΩ) from the 1.2V rail to RSTIN and GND to scale the voltage to 626mV. The device's ±100nA RSTIN input current enables high-resistor values, minimizing divider power loss.
What package type and dimensions does MAX6734AKASHD3+T use?
MAX6734AKASHD3+T uses an 8-pin SOT23-8 package (K8S-3), with body dimensions of 3.00mm × 1.75mm × 1.30mm, gull-wing leads, and JEDEC MO178 BA compliance. Pin pitch is 0.65mm, and the package supports reflow soldering per J-STD-020; the "+T" suffix confirms lead-free finish.
MAX6734AKASHD3+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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6734AKASHD3+T FAQ
1.How can I place an order for MAX6734AKASHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734AKASHD3+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 MAX6734AKASHD3+T reliable?
The price and inventory of MAX6734AKASHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734AKASHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6734AKASHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734AKASHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734AKASHD3+T?
MAX6734AKASHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734AKASHD3+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 MAX6734AKASHD3+T?
For technical support, including MAX6734AKASHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734AKASHD3+T requirements.
6.How does Aetrix verify that MAX6734AKASHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6734AKASHD3+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 MAX6734AKASHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6734AKASHD3+T?
All MAX6734AKASHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734AKASHD3+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 MAX6734AKASHD3+T part is unused and in its original packaging.
Return procedure for MAX6734AKASHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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