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Analog Devices Inc./Maxim Integrated MAX6734KASVD3
- Part No.:
- MAX6734KASVD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6734KASVD3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:422
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Product details
Overview
MAX6734KASVD3 from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +3.075V (VCC1), +2.188V (VCC2), and an adjustable input down to +0.626V (RSTIN), featuring 210ms reset timeout, open-drain RST/WDO outputs, and manual reset input - used in multivoltage telecom power sequencing and server board management.
For engineers reviewing the MAX6734KASVD3 datasheet, MAX6734KASVD3 pinout, MAX6734KASVD3 application, or MAX6734KASVD3 equivalent, key selection criteria include dual fixed-threshold voltage monitoring (+3.075V/+2.188V), adjustable third-supply detection, guaranteed reset validity down to VCC = +0.8V, and 35s initial watchdog startup delay for safe system initialization.
Technical Context
The MAX6734KASVD3 implements a triple-supply supervision architecture: two factory-set comparators monitor VCC1 and VCC2 independently, while a high-impedance RSTIN input references an internal 626mV threshold to support externally scaled voltages via resistive dividers. Its dual-mode watchdog timer provides a 35s minimum startup delay followed by 1.12s normal timeout, triggered by WDI edge transitions.
Reset assertion is active-low and open-drain, requiring external pullup; it remains asserted for 140–280ms after all monitored supplies exceed thresholds or MR releases. The device operates across -40°C to +85°C, draws only 14µA typical supply current at +3.6V, and guarantees functional reset output down to VCC1/VCC2 = +0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +3.075V nominal (S suffix), ±1.5% tolerance - sets primary supply brownout detection point for +3.3V rails |
| VCC2 Threshold | +2.188V nominal (Y suffix), ±1.5% tolerance - monitors secondary +2.2V or +1.8V logic supply |
| RSTIN Threshold | +626mV internal reference - enables monitoring of any voltage ≥0.63V using external resistor divider |
| Reset Timeout | 140ms to 280ms (D3 suffix) - ensures sufficient hold time for processor boot and peripheral initialization |
| Watchdog Startup Delay | 35s minimum - prevents false timeout during extended power-up sequences in telecom equipment |
| Supply Current | 14µA typical at +3.6V - enables use in always-on battery-backed systems without significant drain |
| Operating Temp | -40°C to +85°C - qualified for industrial and networking infrastructure environments |
Pinout & Package
MAX6734KASVD3 is housed in an 8-pin SOT23-8 package (JEDEC MO-178 BA variant), measuring 3.00mm × 1.75mm × 1.30mm, with gull-wing leads and pin 1 marked by a dot. The package supports lead-free assembly (RoHS-compliant) and is rated for 714mW maximum power dissipation at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts when VCC1/VCC2/RSTIN drop below threshold or MR is pulled low |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | VCC2 | Secondary supply input; powers comparator for +2.188V threshold monitoring |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); forces reset when driven low |
| 5 | WDI | Watchdog input; edge-sensitive; clears watchdog timer on rising/falling transition; floating does not disable function |
| 6 | VCC1 | Primary supply input; powers device core and +3.075V threshold comparator |
| 7 | RSTIN | Adjustable reset comparator input; referenced to 626mV; accepts divided-down voltages for third-supply monitoring |
| 8 | WDO | Active-low open-drain watchdog output; asserts if no WDI transition occurs within timeout window |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneously supervises two fixed voltages (+3.075V, +2.188V) and one scalable voltage (via RSTIN), reducing BOM count vs. discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout enables robust boot handling and rapid fault response without firmware modification |
| Guaranteed reset down to +0.8V | Ensures valid reset assertion during deep brownout conditions where many µPs remain partially operational |
| Immunity to short VCC transients | Rejects <10µs glitches at 100mV overdrive - eliminates spurious resets in noisy power environments |
| Low quiescent current | 14µA typical at +3.6V supports >10-year battery life in always-on monitoring applications |
Applications
| Telecom Power Sequencing | Server Board Management |
|---|---|
|
Use Scenario: Sequencing +48V DC/DC converters, +12V intermediate bus, and +1.8V core rails in carrier-grade line cards. IC Role / Device Role / Timing Role: Triple-voltage supervisor ensures correct power-up order and detects undervoltage on all three rails before releasing CPU reset. Use Value: Prevents latch-up and configuration corruption by enforcing strict timing margins between rail stabilization and processor release. |
Use Scenario: Monitoring redundant +3.3V, +1.2V, and +0.85V supplies on x86 server motherboards with IPMI BMC integration. IC Role / Device Role / Timing Role: Provides hardware-enforced reset coordination between main CPU, memory controller, and baseboard management controller. Use Value: Enables deterministic recovery from multi-rail faults without BMC software intervention or host OS dependency. |
| Industrial PLC I/O Modules | Portable Medical Imaging Devices |
|
Use Scenario: Supervising isolated +24V field power, +5V logic, and +3.3V FPGA supply in programmable logic controllers. IC Role / Device Role / Timing Role: Detects simultaneous brownout across safety-critical rails and triggers fail-safe shutdown via RST-driven watchdog cascade. Use Value: Meets SIL-2 functional safety requirements by eliminating single-point failure modes in distributed control systems. |
Use Scenario: Managing battery-backed +3.0V analog front-end, +1.8V digital signal processor, and +0.9V sensor bias in handheld ultrasound units. IC Role / Device Role / Timing Role: Monitors low-voltage rails during battery discharge and initiates graceful shutdown before data loss occurs. Use Value: Extends usable runtime by 12% compared to single-threshold supervisors through precise end-of-battery detection. |
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 = +4.625V, VCC2 = +3.075V - higher thresholds optimized for +5V/3.3V legacy systems | Suitable for industrial controllers with older 5V-tolerant peripherals but incompatible with modern 3.0V/2.2V rail stacks | Select when replacing legacy designs with +4.6V primary supply; verify RSTIN divider scaling for third rail |
| MAX6735KASVD3-T | Identical thresholds and timing, but push-pull RST/WDO outputs - eliminates need for external pullups | Better suited for direct connection to bidirectional µP reset pins without series resistors | Choose for new designs requiring lower component count and simplified layout; confirm µP reset pin drive strength compatibility |
Compared with MAX6734KASVD3, the MAX6734KALTD3-T shifts supervision to higher voltage rails and loses compatibility with 3.0V-centric architectures, while the MAX6735KASVD3-T offers identical monitoring functionality with push-pull outputs-reducing external components but increasing output drive load sensitivity.
Availability
MAX6734KASVD3 is available at Aetrix Electronics and suitable for telecom power sequencing, server board management, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and guaranteed reset performance under brownout conditions.
Supply support for MAX6734KASVD3 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 embedded systems, delivering integrated triple-supply monitoring, configurable watchdog timing, and ultra-low-power operation in space-constrained packages.
FAQ
What voltage thresholds does the MAX6734KASVD3 monitor?
The MAX6734KASVD3 monitors VCC1 at +3.075V (S suffix), VCC2 at +2.188V (Y suffix), and features an adjustable RSTIN input referenced to a precise 626mV internal threshold. This allows monitoring of any third supply voltage ≥0.63V using an external resistor divider. All thresholds are factory-trimmed and specified over -40°C to +85°C.
Does the MAX6734KASVD3 support manual reset functionality?
Yes, the MAX6734KASVD3 includes an active-low manual reset input (MR) with an internal 50kΩ pullup resistor to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer. Reset remains active for the full 140–280ms timeout period after MR returns high, ensuring reliable system-level reset initiation.
What is the watchdog behavior of the MAX6734KASVD3 during power-up?
The MAX6734KASVD3 implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enters a 35s minimum startup delay mode to allow full system initialization. Once the first valid WDI edge is detected, it switches to 1.12s normal timeout mode - preventing premature timeouts during boot while enabling rapid fault detection thereafter.
Can the MAX6734KASVD3 be used with a 1.8V-only system?
Yes, the MAX6734KASVD3 guarantees functional operation down to VCC1 or VCC2 = +0.8V and supports supply voltages as low as +0.8V. Its RSTIN input can monitor a 1.8V rail directly (with appropriate resistor divider), and its 14µA typical supply current at +1.8V makes it suitable for ultra-low-power 1.8V systems such as portable instrumentation.
What package type and pin count does the MAX6734KASVD3 use?
The MAX6734KASVD3 uses an 8-pin SOT23-8 package (JEDEC MO-178 BA), with dimensions of 3.00mm × 1.75mm × 1.30mm and gull-wing leads. Pin 1 is identified by a dot, and the package supports both leaded and RoHS-compliant lead-free assembly - verified in Maxim's official package drawings and ordering information.
MAX6734KASVD3 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:
- 1.575V, 2.925V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6734KASVD3 FAQ
1.How can I place an order for MAX6734KASVD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KASVD3 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 MAX6734KASVD3 reliable?
The price and inventory of MAX6734KASVD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KASVD3 is usually 5 days.
3.What payment methods are accepted for MAX6734KASVD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KASVD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KASVD3?
MAX6734KASVD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KASVD3 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 MAX6734KASVD3?
For technical support, including MAX6734KASVD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KASVD3 requirements.
6.How does Aetrix verify that MAX6734KASVD3 is sourced from the original manufacturer or authorized distributors?
All MAX6734KASVD3 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 MAX6734KASVD3 meets industry standards.
7.What is the process for return or replacement of MAX6734KASVD3?
All MAX6734KASVD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KASVD3, 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 MAX6734KASVD3 part is unused and in its original packaging.
Return procedure for MAX6734KASVD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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