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Analog Devices Inc./Maxim Integrated MAX6734KASYD3
- Part No.:
- MAX6734KASYD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6734KASYD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:5,186
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Product details
Overview
The MAX6734KASYD3 from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +2.925V (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 and industrial systems for reliable power-on reset and lockup recovery.
For engineers reviewing the MAX6734KASYD3 datasheet, MAX6734KASYD3 pinout, MAX6734KASYD3 application, or MAX6734KASYD3 equivalent, key selection criteria include dual fixed-threshold voltage monitoring (+2.925V/+2.188V), adjustable third-channel threshold (626mV), 210ms reset timeout, -40°C to +85°C operation, and SOT23-8 open-drain output compatibility with µP reset interfaces.
Technical Context
The MAX6734KASYD3 implements three independent voltage monitors: two factory-set comparators (VCC1 = +2.925V, VCC2 = +2.188V) and one high-impedance adjustable comparator (RSTIN = 626mV reference) enabling external resistor-divider configuration for third-supply monitoring. All three inputs feed into a shared reset logic block that asserts active-low RST on any undervoltage condition.
Its watchdog circuit operates in dual-mode: 35s minimum startup delay after reset for system initialization, then transitions to 1.12s minimum normal timeout upon first WDI edge detection; WDO is open-drain and asserted low on watchdog timeout or VCC/RSTIN undervoltage, with MR input capable of forcing reset and clearing the watchdog timer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +2.925V nominal (S suffix), ±1.5% over temp - sets primary supply monitor for +3.3V rail validation |
| VCC2 Threshold | +2.188V nominal (Y suffix), ±1.5% over temp - sets secondary supply monitor for +2.5V or +2.2V rail validation |
| RSTIN Threshold | +626mV internal reference, ±2.5mV - enables precise third-rail monitoring via external divider |
| Reset Timeout | 140ms–280ms (D3 suffix), typ. 210ms - ensures sufficient hold time for slow-starting µPs and peripherals |
| Supply Current | 14µA typical at +3.6V - supports battery-backed and low-power always-on supervision |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom equipment environments |
| Output Type | Open-drain RST and WDO - allows wired-OR reset bus sharing and flexible pullup voltage selection |
Pinout & Package
MAX6734KASYD3 is housed in an 8-pin SOT23-8 package (3.00mm × 1.75mm × 1.30mm body, 0.65mm pitch), optimized for space-constrained PCB layouts in portable and dense telecom modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output asserted low during VCC1/VCC2/RSTIN undervoltage or MR assertion; requires external pullup |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog, and I/O; must be low-impedance |
| 3 - VCC2 | Secondary supply input | Power source and monitored voltage for +2.188V threshold; powers internal circuitry when > VCC1 |
| 4 - WDO | Active-low watchdog output | Open-drain output asserted low on watchdog timeout or VCC/RSTIN undervoltage; shares reset bus capability |
| 5 - VCC1 | Primary supply input | Power source and monitored voltage for +2.925V threshold; powers internal circuitry when > VCC2 |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising/falling edges reset watchdog timer; floating state does not disable function |
| 7 - RSTIN | Adjustable reset comparator input | High-impedance (±25nA) input referenced to 626mV; accepts divided-down voltages up to VCC1 |
| 8 - MR | Active-low manual reset input | Drives reset when pulled low; includes 50kΩ internal pullup to VCC1; debounced by 100ns glitch rejection |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises +2.925V, +2.188V, and adjustable third rail - eliminates need for three discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout - accommodates boot sequences while ensuring rapid lockup detection |
| Guaranteed reset validity | Valid RST output down to VCC1/VCC2 = +0.8V - maintains system integrity during brownout conditions |
| Immunity to VCC transients | Rejects falling glitches <45µs at 100mV overdrive - prevents spurious resets in noisy power environments |
| Low quiescent current | 14µA typical at +3.6V - extends battery life in portable applications without sacrificing supervision accuracy |
Applications
| Telecom Line Card Power Supervision | Industrial PLC CPU Module |
|---|---|
Use Scenario: Monitoring +3.3V control rail, +2.5V I/O rail, and +1.2V core rail in a carrier-grade line card with hot-swap capability. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across FPGA, DSP, and memory subsystems during power sequencing faults. Use Value: Prevents partial initialization by holding reset until all three rails stabilize above thresholds, with 210ms timeout ensuring full regulator settling. | Use Scenario: Supervising +24V-to-+5V DC/DC output, +3.3V logic rail, and +1.8V FPGA core in a modular programmable logic controller. IC Role / Device Role / Timing Role: Fault-detection node triggering system-wide reset and watchdog-initiated recovery on firmware hang or brownout. Use Value: Open-drain RST/WDO outputs enable direct connection to shared reset bus; MR input supports front-panel emergency reset. |
| Network Router Baseboard Management | Medical Diagnostic Imaging Subsystem |
Use Scenario: Validating +12V fan supply, +3.3V management controller rail, and +2.5V PHY interface rail in a redundant router baseboard. IC Role / Device Role / Timing Role: Independent watchdog output (WDO) feeds separate safety monitor while RST controls main processor reset domain. Use Value: Dual-mode watchdog provides 35s boot window for BMC firmware load, then switches to 1.12s fault response - meeting IEC 62443 timing requirements. | Use Scenario: Monitoring +5V analog sensor supply, +3.3V ADC/DAC rail, and +1.2V image processor core in a portable ultrasound subsystem. IC Role / Device Role / Timing Role: Adjustable RSTIN channel configured for +4.0V sensor bias rail via resistor divider, extending supervision beyond fixed thresholds. Use Value: 626mV internal reference enables accurate third-rail monitoring with <3mV hysteresis - critical for noise-sensitive analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KASVD3-T | VCC2 threshold = +1.575V (V suffix) instead of +2.188V (Y suffix); same D3 timeout, SOT23-8, open-drain outputs | Optimized for +1.8V/1.5V dual-rail systems rather than +3.3V/2.5V; requires revalidation of VCC2 margin | Select when supervising lower secondary rails; verify RSTIN divider ratio remains valid under new VCC2 operating point |
| MAX6735KASYD3-T | Identical thresholds and timeout, but push-pull RST/WDO outputs instead of open-drain; same pinout and footprint | Eliminates need for external pullups but incompatible with wired-OR reset buses; higher drive strength for heavy capacitive loads | Choose for single-load reset distribution or where board-level pullup resistors are undesirable; confirm µP reset pin tolerates push-pull drive |
Compared with MAX6734KASYD3-T, MAX6734KASVD3-T shifts VCC2 monitoring to +1.575V for low-voltage SoC rails, while MAX6735KASYD3-T replaces open-drain outputs with push-pull - offering stronger drive but requiring redesign of reset bus topology.
Availability
MAX6734KASYD3 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, network routers, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and guaranteed reset timing under brownout conditions.
Supply support for MAX6734KASYD3 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 industrial, automotive, communications, and computing markets.
The MAX6730–MAX6735 family delivers integrated triple-voltage supervision with independent watchdog functionality, targeting high-reliability embedded systems where simultaneous multi-rail validation and fail-safe processor recovery are essential.
FAQ
What are the exact factory-set reset thresholds for MAX6734KASYD3?
The MAX6734KASYD3 features VCC1 threshold of +2.925V (S suffix) and VCC2 threshold of +2.188V (Y suffix), both with ±1.5% tolerance over -40°C to +85°C. Its RSTIN input uses a precise +626mV internal reference for adjustable third-rail monitoring via external resistor divider.
Does MAX6734KASYD3 support manual reset functionality?
Yes, MAX6734KASYD3 includes an active-low manual reset input (MR) with 50kΩ internal pullup to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer; reset remains active for the full 210ms timeout after MR release.
What is the watchdog timeout behavior of MAX6734KASYD3?
MAX6734KASYD3 employs dual-mode watchdog timing: a 35s minimum startup delay after reset for system initialization, followed by 1.12s minimum normal timeout after first WDI edge detection. WDO asserts low on timeout or VCC/RSTIN undervoltage.
Can MAX6734KASYD3 monitor a +5V supply using the RSTIN pin?
Yes, MAX6734KASYD3 can monitor +5V via RSTIN using a resistor divider. With its +626mV internal reference, a 7.02:1 divider (e.g., 6.02kΩ top, 1kΩ bottom) scales +5V to 626mV at RSTIN, enabling accurate undervoltage detection for higher rails.
What package type and footprint does MAX6734KASYD3 use?
MAX6734KASYD3 is packaged in an 8-pin SOT23-8 (3.00mm × 1.75mm × 1.30mm) with 0.65mm lead pitch. It shares footprint compatibility with other MAX6734/MAX6735 variants and requires standard SOT23-8 reflow profiles per JEDEC MO-178 BA.
MAX6734KASYD3 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:
- 2.188V, 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
MAX6734KASYD3 FAQ
1.How can I place an order for MAX6734KASYD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KASYD3 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 MAX6734KASYD3 reliable?
The price and inventory of MAX6734KASYD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KASYD3 is usually 5 days.
3.What payment methods are accepted for MAX6734KASYD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KASYD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KASYD3?
MAX6734KASYD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KASYD3 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 MAX6734KASYD3?
For technical support, including MAX6734KASYD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KASYD3 requirements.
6.How does Aetrix verify that MAX6734KASYD3 is sourced from the original manufacturer or authorized distributors?
All MAX6734KASYD3 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 MAX6734KASYD3 meets industry standards.
7.What is the process for return or replacement of MAX6734KASYD3?
All MAX6734KASYD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KASYD3, 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 MAX6734KASYD3 part is unused and in its original packaging.
Return procedure for MAX6734KASYD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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