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Analog Devices Inc./Maxim Integrated MAX6735KASHD3
- Part No.:
- MAX6735KASHD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KASHD3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,050
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Product details
Overview
MAX6735KASHD3 from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+2.925V), VCC2 (+1.313V), and adjustable RSTIN (626mV threshold), featuring 140–280ms reset timeout, push-pull RST/WDO outputs, and manual reset input - used in multivoltage telecom and industrial systems to ensure reliable power-on initialization and runtime fault detection.
For engineers reviewing the MAX6735KASHD3 datasheet, MAX6735KASHD3 pinout, MAX6735KASHD3 application, or MAX6735KASHD3 equivalent, this page delivers verified circuit role, factory-set dual fixed thresholds, adjustable third-voltage monitoring capability, watchdog startup delay (35s min), and SOT23-8 package compatibility for compact embedded designs.
Technical Context
The MAX6735KASHD3 implements a triple-supply monitoring architecture: two factory-trimmed comparators for VCC1 and VCC2, plus a high-impedance adjustable comparator on RSTIN referenced to an internal 626mV bandgap. It guarantees valid reset assertion down to VCC1/VCC2 = +0.8V and features hysteresis of 0.5% of threshold voltage.
Its dual-mode watchdog operates with a 35s minimum initial timeout after reset for system boot, then transitions to a 1.12s minimum normal timeout; WDI edge detection clears the timer, and WDO asserts low on timeout or undervoltage lockout - all with independent push-pull drive capability for both RST and WDO outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +2.925V nominal (S suffix), ±1.5% tolerance over -40°C to +85°C - sets primary supply monitor point for 3.3V rail supervision |
| VCC2 Threshold | +1.313V nominal (H suffix), ±1.5% tolerance - enables secondary monitoring of 1.5V/1.3V logic or memory rails |
| RSTIN Threshold | 626mV internal reference, ±2.5mV max deviation - supports external resistor divider for third-voltage monitoring down to +0.63V |
| Reset Timeout | 140–280ms (D3 suffix) - ensures sufficient hold time for processor initialization before release |
| Watchdog Timeout | 35s min startup / 1.12s min normal mode - prevents premature timeout during boot while enabling rapid fault response post-initialization |
| Supply Current | 14µA typical at +3.6V - enables long battery life in portable equipment without compromising supervision accuracy |
| Operating Temp | -40°C to +85°C - fully specified for industrial and telecom environments with no derating required |
Pinout & Package
The MAX6735KASHD3 is housed in an 8-pin SOT23-8 package (JEDEC MO-178 BA), measuring 3.00mm × 1.75mm × 1.30mm, with gull-wing leads and coplanarity ≤ 0.1mm - optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Drives µP reset pin directly without external pullup; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog logic, and output drivers |
| 3 - VCC2 | Secondary supply input | Powers internal circuitry when VCC2 > VCC1; feeds secondary threshold comparator (1.313V) |
| 4 - MR | Active-low manual reset input | Internal 50kΩ pullup to VCC1; drives RST low when asserted, clearing watchdog timer |
| 5 - WDI | Watchdog input | Edge-sensitive input; rising/falling transitions reset watchdog timer; floating state does not disable function |
| 6 - VCC1 | Primary supply input | Powers device when VCC1 > VCC2; feeds primary threshold comparator (2.925V) |
| 7 - RSTIN | Adjustable reset comparator input | High-impedance (±25nA) node referenced to 626mV; accepts resistive divider for third-rail monitoring |
| 8 - WDO | Active-low push-pull watchdog output | Independent of RST; asserts low on WDI timeout or VCC1/VCC2/RSTIN undervoltage - can be wired to MR for auto-reset |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises VCC1 (+2.925V), VCC2 (+1.313V), and adjustable RSTIN (626mV) - eliminates need for three discrete supervisors |
| Push-pull RST and WDO | Eliminates external pullup resistors and reduces BOM count; supports direct interface to bidirectional µP reset pins via 10kΩ series resistor |
| Dual-mode watchdog | 35s startup delay prevents false timeout during boot; 1.12s normal mode enables fast recovery from software hangs |
| Guaranteed reset validity | Operates and asserts valid RST down to VCC1/VCC2 = +0.8V - ensures reset integrity during brownout conditions |
| Immunity to VCC transients | Rejects falling VCC glitches <10µs at 100mV overdrive - avoids spurious resets in noisy power environments |
Applications
| Telecom Line Card Power Management | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervising +3.3V control logic, +1.5V FPGA core, and +1.2V ADC analog supply in a field-deployed line card. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across domains and triggering watchdog recovery on firmware stalls. Use Value: Prevents partial initialization failure by holding all subsystems in reset until all rails stabilize; 140–280ms timeout matches FPGA configuration timing. | Use Scenario: Monitoring +24V-to-+5V DC/DC output, isolated +3.3V controller rail, and +1.8V sensor interface in a modular PLC backplane. IC Role / Device Role / Timing Role: Fault-detection hub that initiates system-wide reset on any rail collapse and logs watchdog timeouts via WDO signal. Use Value: Enables deterministic recovery from transient overloads without requiring host CPU intervention; push-pull outputs drive optocouplers directly. |
| Medical Infusion Pump Controller | Battery-Powered IoT Gateway |
Use Scenario: Ensuring safe startup and runtime integrity of +5V motor driver, +3.3V MCU, and +1.2V RF transceiver in a Class II medical device. IC Role / Device Role / Timing Role: Safety-critical supervisor providing fail-safe reset coordination and independent watchdog supervision of MCU execution flow. Use Value: Guarantees reset assertion down to +0.8V during battery sag; 14µA quiescent current extends operational runtime between charges. | Use Scenario: Managing power sequencing and fault response for +3.6V Li-ion supply, +2.8V BLE SoC, and +1.8V environmental sensor in a wireless edge node. IC Role / Device Role / Timing Role: Low-power triple-supply monitor with adjustable RSTIN enabling precise battery voltage thresholding via resistor divider. Use Value: RSTIN's 626mV reference allows accurate +2.7V battery EOC detection using only two external resistors - no additional voltage reference needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KASHD3-T | Same thresholds (2.925V/1.313V), same D3 timeout, but open-drain RST/WDO outputs | Requires external pullup resistors; unsuitable for direct drive of bidirectional µP reset pins without series resistor | Select when board layout already includes pullups or when interfacing with open-collector systems |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no RSTIN input; no manual reset; 200ms timeout | Lacks dual/third-rail monitoring and MR functionality - cannot replace triple-monitoring requirement | Consider only for simplified single-rail designs where cost and footprint are prioritized over feature set |
Compared with MAX6734KASHD3-T, the MAX6735KASHD3 offers push-pull outputs eliminating external components; versus TPS3808G33DBVR, it provides full triple-voltage supervision, manual reset, and adjustable monitoring - making it uniquely suited for complex multirail embedded systems requiring coordinated fault response.
Availability
MAX6735KASHD3 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLC modules, medical infusion pumps, battery-powered IoT gateways, and programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6735KASHD3 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 specifically for multivoltage microprocessor systems needing coordinated reset, configurable voltage monitoring, and robust watchdog supervision - targeting telecom infrastructure, industrial automation, and portable medical devices.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735KASHD3?
The MAX6735KASHD3 has a VCC1 reset threshold of +2.925V (S suffix) and a VCC2 reset threshold of +1.313V (H suffix), both factory-trimmed with ±1.5% tolerance over -40°C to +85°C. These values are confirmed in Maxim's Reset Voltage Threshold Suffix Guide (Table 1) and electrical characteristics tables - the "SH" in the part number directly encodes these two thresholds.
Does the MAX6735KASHD3 support monitoring a third voltage, and how is it configured?
Yes, the MAX6735KASHD3 supports third-voltage monitoring via the RSTIN pin, which features a precise 626mV internal reference. To monitor voltages above 626mV, connect a resistive divider from the target rail to RSTIN and GND. The MAX6735KASHD3 datasheet provides the formula VEXT_TH = 626mV × (R1 + R2)/R2 to calculate resistor values for desired trip points.
What is the watchdog behavior of the MAX6735KASHD3 during power-up and normal operation?
The MAX6735KASHD3 implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enters a 35s minimum startup mode to allow full system initialization; once a valid WDI edge occurs, it switches to 1.12s minimum normal timeout. This ensures robust boot handling while maintaining rapid fault detection - a key differentiator of the MAX6735KASHD3 versus single-mode supervisors.
How does the MAX6735KASHD3 handle undervoltage conditions on VCC1 or VCC2?
The MAX6735KASHD3 guarantees valid reset assertion down to VCC1 or VCC2 = +0.8V, with RST remaining low until both supplies exceed their respective thresholds and the 140–280ms timeout expires. Its internal comparators include 0.5% hysteresis to prevent chatter near threshold, and the device rejects short VCC transients (<10µs at 100mV overdrive), ensuring immunity to power rail noise.
What package type and pin count does the MAX6735KASHD3 use, and are there thermal considerations?
The MAX6735KASHD3 uses an 8-pin SOT23-8 package (JEDEC MO-178 BA) with dimensions 3.00mm × 1.75mm × 1.30mm. Its maximum continuous power dissipation is 714mW at +70°C, derating by 8.9mW/°C above that temperature. The small footprint supports high-density layouts, and its BiCMOS process ensures stable operation across the full -40°C to +85°C range without thermal derating.
MAX6735KASHD3 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:
- 1.313V, 2.925V, 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
MAX6735KASHD3 FAQ
1.How can I place an order for MAX6735KASHD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KASHD3 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 MAX6735KASHD3 reliable?
The price and inventory of MAX6735KASHD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KASHD3 is usually 5 days.
3.What payment methods are accepted for MAX6735KASHD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KASHD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KASHD3?
MAX6735KASHD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KASHD3 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 MAX6735KASHD3?
For technical support, including MAX6735KASHD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KASHD3 requirements.
6.How does Aetrix verify that MAX6735KASHD3 is sourced from the original manufacturer or authorized distributors?
All MAX6735KASHD3 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 MAX6735KASHD3 meets industry standards.
7.What is the process for return or replacement of MAX6735KASHD3?
All MAX6735KASHD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KASHD3, 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 MAX6735KASHD3 part is unused and in its original packaging.
Return procedure for MAX6735KASHD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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