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Analog Devices Inc./Maxim Integrated MAX6735KALTD3+T
- Part No.:
- MAX6735KALTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KALTD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX6735KALTD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 at 4.625V, VCC2 at 3.075V, and an adjustable RSTIN input (626mV threshold), featuring push-pull RESET and WDO outputs, 140–280ms reset timeout, and operation from -40°C to +85°C - used in multivoltage telecom and industrial systems for reliable power-on reset and lockup recovery.
For engineers reviewing the MAX6735KALTD3+T datasheet, MAX6735KALTD3+T pinout, MAX6735KALTD3+T application, or MAX6735KALTD3+T equivalent, key selection criteria include its dual fixed-threshold supervision (4.625V/3.075V), third adjustable voltage monitor, push-pull active-low reset and watchdog outputs, 140–280ms reset timeout, and SOT23-8 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6735KALTD3+T implements a triple-supply monitoring architecture: two factory-set thresholds (VCC1 = 4.625V, VCC2 = 3.075V) and one high-impedance adjustable comparator input (RSTIN = 626mV reference) enabling precise third-rail supervision down to 0.63V via external divider. Its reset assertion logic guarantees validity down to VCC ≥ +0.8V.
It integrates a dual-mode watchdog timer: 35s minimum startup delay after reset for system initialization, followed by 1.12s minimum normal-mode timeout; both modes drive an independent active-low push-pull WDO output. The manual reset (MR) input features internal 50kΩ pullup and 200ns propagation delay to RST.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-set; ensures reliable reset assertion when primary supply drops below nominal 4.63V rail) |
| VCC2 Threshold | 3.075V (factory-set; monitors secondary 3.3V rail with ±75mV hysteresis) |
| RSTIN Threshold | 626mV (internal reference; enables monitoring of third rail ≥0.63V using external resistor divider) |
| Reset Timeout | 140–280ms (D3 option; defines minimum reset pulse width for safe μP initialization) |
| Watchdog Startup Delay | 35s min (allows full system boot before watchdog begins normal monitoring) |
| Normal Watchdog Timeout | 1.12s min (detects software hang within sub-second window after initialization) |
| Supply Current | 15µA typ at +3.6V (enables long battery life in portable equipment) |
| Operating Temp | -40°C to +85°C (fully specified for industrial and extended-temperature applications) |
Pinout & Package
MAX6735KALTD3+T is housed in an 8-pin SOT23 package (K8SN+1 outline, JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, with exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation; drives μP reset pin directly without external pullup |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O; must be low-impedance connection to system ground plane |
| 3 | VCC2 | Secondary supply input; powers internal circuitry when > VCC1 and serves as monitored rail with 3.075V threshold |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); initiates reset and clears watchdog on logic-low assertion |
| 5 | RSTIN | Adjustable reset comparator input; high-impedance (±25nA) node referenced to 626mV; accepts divided-down voltages ≥0.63V |
| 6 | WDI | Watchdog input; edge-sensitive (rising/falling); resets watchdog timer on each valid transition; unconnected requires 100kΩ pulldown |
| 7 | WDO | Active-low push-pull watchdog output; asserts low on WDI timeout or VCC/RSTIN undervoltage; deasserts immediately upon recovery |
| 8 | VCC1 | Primary supply input; powers device when > VCC2 and serves as monitored rail with 4.625V threshold; supplies internal reference and logic |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors two fixed rails (4.625V/3.075V) and one user-adjustable rail (via RSTIN), reducing need for discrete supervisors or external resistors |
| Dual-mode watchdog timer | 35s startup delay enables full boot sequence completion; 1.12s normal timeout provides rapid lockup detection post-initialization |
| Push-pull RST and WDO outputs | Eliminates need for external pullup resistors, simplifying PCB layout and improving noise immunity in high-speed digital systems |
| Guaranteed reset validity to 0.8V | Ensures clean reset assertion even during brownout conditions where VCC1 or VCC2 dips near operational floor |
| Immunity to short VCC transients | Rejects <100ns glitches on supply rails, preventing spurious resets in electrically noisy environments like motor drives or switching PSUs |
| Low 15µA supply current | Minimizes quiescent power draw in always-on subsystems such as battery-backed real-time clocks or remote sensors |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +48V DC-DC derived rails (+3.3V, +1.8V, +1.2V) in base station line cards under variable load and temperature. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting coordinated reset across FPGA, DSP, and interface ICs during brownout or startup sequencing failure. Use Value: Prevents partial initialization and firmware corruption by enforcing strict voltage-ordering and timeout-based recovery across three critical rails. | Use Scenario: Supervising isolated 24V field power, 5V logic, and 3.3V MCU core in programmable logic controller backplanes exposed to EMI and voltage surges. IC Role / Device Role / Timing Role: Fault-detection hub triggering system-wide reset and watchdog-initiated recovery when any rail violates tolerance bands during transient events. Use Value: Enables deterministic fail-safe behavior per IEC 61508 SIL-2 requirements through guaranteed reset assertion and independent watchdog escalation. |
| Medical Diagnostic Imaging | Automotive ADAS Camera Modules |
Use Scenario: Ensuring reliable boot of multi-core imaging processors and high-speed ADCs in ultrasound or MRI front-end electronics. IC Role / Device Role / Timing Role: Coordinating power-good sequencing and runtime lockup detection across analog sensor bias, digital processing, and communication interfaces. Use Value: Eliminates silent data corruption by coupling precise voltage monitoring (±0.5% threshold accuracy) with sub-second watchdog response. | Use Scenario: Supervising camera SoC core, I/O, and image sensor power domains in automotive surround-view systems operating from 12V battery with wide temperature swing. IC Role / Device Role / Timing Role: Enforcing AEC-Q100-compliant reset timing and watchdog coverage for ASIL-B functional safety compliance. Use Value: Provides certified fault containment for vision processing pipelines, meeting ISO 26262 requirements without adding redundant supervisory ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KALTD3+T | Same pinout and thresholds, but open-drain RST/WDO outputs requiring external pullups | Suitable for systems needing level-shifting or wired-OR reset bus configurations | Select when interfacing with bidirectional μP reset pins or shared reset buses where open-drain drive is required |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no adjustable RSTIN, no independent WDO, 200ms timeout | Limited to single-rail monitoring; lacks triple-voltage capability and dedicated watchdog output | Choose only for cost-sensitive, single-rail applications where third-rail supervision and watchdog independence are unnecessary |
Compared with MAX6734KALTD3+T and TPS3808G33DBVR, the MAX6735KALTD3+T uniquely delivers triple-rail supervision with push-pull outputs and independent watchdog signaling in a compact SOT23-8 package - essential for space-constrained, multivoltage systems requiring deterministic reset and lockup recovery without external components.
Availability
MAX6735KALTD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6735KALTD3+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 MAX6730–MAX6735 family was engineered for high-reliability embedded systems requiring coordinated multi-rail power monitoring, deterministic reset timing, and independent watchdog coverage - targeting telecom, industrial control, and automotive electronics.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6735KALTD3+T?
The MAX6735KALTD3+T has a factory-set VCC1 reset threshold of 4.625V (typical), with a guaranteed range of 4.500V to 4.750V at 25°C. This value corresponds to the "LT" suffix in Maxim's Reset Voltage Threshold Suffix Guide and is fully specified over the -40°C to +85°C operating temperature range. The MAX6735KALTD3+T uses this threshold to monitor primary supply rails such as +4.63V or +5V systems.
Does the MAX6735KALTD3+T support monitoring a third voltage rail, and how is it configured?
Yes, the MAX6735KALTD3+T supports third-rail monitoring via its RSTIN pin, which features a precise 626mV internal reference. To supervise voltages above 626mV, connect a resistive voltage divider between the target rail and GND, with the midpoint fed to RSTIN. The MAX6735KALTD3+T asserts reset if the divided voltage falls below 626mV. This enables flexible supervision of rails such as +1.2V, +1.8V, or +2.5V using standard resistor values.
What are the watchdog timeout periods supported by the MAX6735KALTD3+T?
The MAX6735KALTD3+T implements a dual-mode watchdog timer: a minimum 35-second startup delay after reset to allow full system initialization, followed by a minimum 1.12-second timeout in normal operation. These values are fixed architecture features - not user-programmable - and apply regardless of reset timeout setting (D3 = 140–280ms). The MAX6735KALTD3+T uses these intervals to prevent premature watchdog assertion during boot while ensuring rapid lockup detection thereafter.
Is the MAX6735KALTD3+T compatible with bidirectional microprocessor reset pins?
Yes, but with caution: the MAX6735KALTD3+T's push-pull RST output can cause contention with bidirectional μP reset I/O ports. To avoid logic conflict, insert a 10kΩ series resistor between the MAX6735KALTD3+T RST pin and the μP reset pin. This limits current during potential state conflicts while preserving reset signal integrity. The MAX6735KALTD3+T datasheet explicitly recommends this configuration for safe interoperability.
What package type and RoHS status does the MAX6735KALTD3+T use?
The MAX6735KALTD3+T is supplied in an 8-pin SOT23 package (K8SN+1 outline, JEDEC MO-178AA) with lead(Pb)-free, RoHS-compliant construction indicated by the "+T" suffix. It measures 2.9mm × 1.6mm × 1.1mm and features gull-wing leads compatible with standard reflow soldering profiles, including peak temperatures up to +260°C. The MAX6735KALTD3+T is not automotive-qualified (no "/V" suffix), and operates across the industrial temperature range (-40°C to +85°C).
MAX6735KALTD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.075V, 4.625V, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6735KALTD3+T FAQ
1.How can I place an order for MAX6735KALTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KALTD3+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 MAX6735KALTD3+T reliable?
The price and inventory of MAX6735KALTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KALTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735KALTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KALTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KALTD3+T?
MAX6735KALTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KALTD3+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 MAX6735KALTD3+T?
For technical support, including MAX6735KALTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KALTD3+T requirements.
6.How does Aetrix verify that MAX6735KALTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735KALTD3+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 MAX6735KALTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735KALTD3+T?
All MAX6735KALTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KALTD3+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 MAX6735KALTD3+T part is unused and in its original packaging.
Return procedure for MAX6735KALTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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