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Analog Devices Inc./Maxim Integrated MAX6355RWUT
- Part No.:
- MAX6355RWUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6355RWUT.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,200
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Product details
Overview
MAX6355RWUT from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with open-drain active-low reset output, 2.63V VCC1 threshold, 1.67V VCC2 threshold, and adjustable RSTIN input (1.22V typical) for monitoring a third voltage. It operates from -40°C to +85°C in a 6-pin SOT23 package and supports systems requiring reliable power-on reset, manual reset debouncing, and supply fault detection across three rails.
For engineers reviewing the MAX6355RWUT datasheet, MAX6355RWUT pinout, MAX6355RWUT application, or MAX6355RWUT equivalent, key selection criteria include its dual-supply monitoring capability (VCC1/VCC2), RSTIN-based third-voltage supervision, open-drain reset architecture, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, and compatibility with multivoltage embedded controllers and portable equipment.
Technical Context
The MAX6355RWUT integrates two independent voltage comparators for VCC1 and VCC2 monitoring, plus a dedicated RSTIN comparator referenced to 1.22V (±3mV over temperature), enabling precise third-rail supervision via external resistive divider. Its reset generator asserts RST when any monitored supply drops below its factory-set threshold or when MR is pulled low.
Unlike watchdog-equipped variants (e.g., MAX6358–MAX6360), the MAX6355RWUT omits watchdog functionality but retains debounced TTL/CMOS-compatible manual reset input and guarantees valid reset output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - critical for brownout resilience in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.63V ±0.05V at +25°C; ensures reliable reset assertion when primary supply falls below nominal 2.63V rail |
| VCC2 Threshold | 1.67V ±0.03V at +25°C; enables accurate monitoring of secondary low-voltage rail (e.g., 1.8V LDO output) |
| RSTIN Threshold | 1.22V ±0.03V; allows precise third-voltage supervision (e.g., 3.3V via 2.7MΩ/1.0MΩ divider) without external reference |
| Supply Current | 20µA typical; minimizes quiescent load on battery or energy-harvesting supplies |
| Reset Timeout | 100ms minimum pulse width; meets JEDEC JESD8-12A requirements for processor initialization hold time |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded control and instrumentation environments |
| Package | 6-pin SOT23; surface-mount footprint compatible with automated PCB assembly and space-constrained designs |
Pinout & Package
MAX6355RWUT is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with 0.95mm pitch, 2.9mm × 1.6mm body, and exposed pad optional per Maxim's package drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup to VCC1 or system rail; sinks ≥1.2mA at 0.3V |
| 2 | GND | Analog/digital ground reference; must be connected to lowest-impedance system ground plane |
| 3 | MR | Debounced manual-reset input; asserted low forces reset; internal 32–100kΩ pullup eliminates need for external resistor |
| 4 | VCC2 | Secondary supply input and monitor rail; powers device when > VCC1; threshold = 1.67V |
| 5 | RSTIN | Adjustable undervoltage-comparator input; 1.22V threshold enables third-rail monitoring via resistive divider |
| 6 | VCC1 | Primary supply input and monitor rail; powers device when > VCC2; threshold = 2.63V |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1 (2.63V), VCC2 (1.67V), and third rail via RSTIN (1.22V), eliminating need for discrete comparators in multirail systems |
| Open-drain RST output | Allows wired-OR reset bus sharing across multiple supervisors or processors without contention |
| Guaranteed reset validity | RESET remains functional even if VCC1 or VCC2 drops to 1.0V - essential for graceful shutdown during brownout |
| No external components | Factory-trimmed thresholds and integrated MR pullup enable full supervision with zero external passives |
| Power-supply transient immunity | Rejects <100ns negative VCC transients up to 1.0V overdrive, preventing false resets in noisy environments |
Applications
| Computers | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Monitoring core logic (2.63V) and I/O (1.67V) rails in compact x86 or ARM-based single-board computers. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RST to coordinate CPU, memory, and peripheral power sequencing. Use Value: Prevents boot failure due to asymmetric rail collapse by holding reset until both VCC1 and VCC2 stabilize above thresholds. | Use Scenario: Supervising main Li-ion (3.3V → 2.63V LDO) and backup coin-cell (1.8V → 1.67V LDO) rails in handheld medical devices. IC Role / Device Role / Timing Role: Triple-rail monitor using RSTIN to track battery voltage via divider, triggering controlled shutdown before deep discharge. Use Value: Extends usable battery life by enabling precise low-voltage cutoff without adding external ADC or comparator. |
| Intelligent Instruments | Multivoltage Systems |
Use Scenario: Ensuring stable operation of precision ADCs and DACs powered by isolated 2.63V analog and 1.67V digital supplies in data acquisition modules. IC Role / Device Role / Timing Role: Fault detector asserting RST upon analog rail droop, halting conversions before corrupted data is captured. Use Value: Eliminates need for separate supervisor per rail, reducing BOM count and PCB area in high-accuracy measurement systems. | Use Scenario: Coordinating power-up sequence across FPGA core (2.63V), I/O bank (1.67V), and auxiliary 3.3V management rail in telecom line cards. IC Role / Device Role / Timing Role: Centralized reset arbiter using RSTIN to verify auxiliary rail integrity before releasing FPGA configuration reset. Use Value: Enables deterministic multi-rail startup timing with single IC, avoiding race conditions between independent supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356RWUT | Push-pull RST output referenced to VCC1 (vs. open-drain); identical VCC1/VCC2/RSTIN thresholds and timing | Requires no external pullup; incompatible with wired-OR reset buses | Select MAX6356RWUT when driving a single processor reset pin directly and minimizing external components |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 or RSTIN inputs; 200ms fixed reset timeout | Lacks triple-rail capability; suitable only for single-rail systems with no third-voltage monitoring need | Choose TPS3808G33DBVR only if supervising one rail and cost is prioritized over multirail flexibility |
Compared with MAX6356RWUT, the MAX6355RWUT provides open-drain reset for bus sharing but requires an external pullup; versus TPS3808G33DBVR, it delivers true triple-voltage supervision at the cost of higher pin count and design complexity - making it indispensable for multirail reliability-critical systems.
Availability
MAX6355RWUT is available at Aetrix Electronics and suitable for computers, portable/battery-powered equipment, intelligent instruments, and multivoltage systems requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6355RWUT 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, computing, and communications markets.
The MAX6351–MAX6360 family delivers multivoltage μP supervision with factory-trimmed thresholds, low quiescent current, and robust reset timing - engineered specifically for reliability-critical embedded systems where power rail integrity determines functional safety.
FAQ
What is the function of the RSTIN pin on the MAX6355RWUT?
The RSTIN pin on the MAX6355RWUT is an adjustable undervoltage-comparator input with a precise 1.22V threshold (±0.03V). It enables monitoring of a third voltage rail - such as a battery or auxiliary supply - using an external resistive divider. When the divided voltage falls below 1.22V, the MAX6355RWUT asserts its open-drain RST output. This feature is unique to the MAX6355RWUT, MAX6356RWUT, and MAX6357RWUT within the family and is not present in dual-supply-only variants like MAX6351 or MAX6358.
Does the MAX6355RWUT include a watchdog timer?
No, the MAX6355RWUT does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358, MAX6359, and MAX6360 variants in the MAX6351–MAX6360 family. The MAX6355RWUT focuses on triple-voltage supervision (VCC1, VCC2, and RSTIN) with manual reset debouncing and guaranteed reset validity down to 1.0V on either supply rail - making it ideal for applications where watchdog oversight is handled externally or not required.
What are the exact voltage thresholds for VCC1 and VCC2 on the MAX6355RWUT?
The MAX6355RWUT has a VCC1 threshold of 2.63V (±0.05V at +25°C, ±0.15V over -40°C to +85°C) and a VCC2 threshold of 1.67V (±0.03V at +25°C, ±0.09V over temperature). These values are factory-trimmed and specified in the Voltage Threshold Levels table of the datasheet under suffix "RW". Both thresholds exhibit ≤20ppm/°C tempco, ensuring stable trip points across industrial temperature ranges.
Can the MAX6355RWUT operate with supply voltages below 2.63V or 1.67V?
Yes - the MAX6355RWUT remains functional and guarantees valid RST output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, even if both are below their respective threshold voltages. Its internal circuitry operates down to 1.2V over the full temperature range (-40°C to +85°C), and the reset output remains asserted (low) when either supply drops below its trip point. This behavior ensures fail-safe operation during brownout conditions common in battery-powered systems.
Is the MAX6355RWUT pin-compatible with other devices in the MAX6351–MAX6360 family?
The MAX6355RWUT uses the same 6-pin SOT23 (U6-1) package and pinout as MAX6356RWUT, MAX6357RWUT, MAX6358RWUT, MAX6359RWUT, and MAX6360RWUT - all share identical pin assignments: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = RSTIN/WDI, Pin 6 = VCC1. However, functional differences exist: RSTIN is unused on MAX6358–MAX6360 (replaced by WDI), and RST topology varies (open-drain vs. push-pull). Thus, while physically interchangeable, electrical compatibility requires verification against target functionality.
MAX6355RWUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.67V, 2.63V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6355RWUT FAQ
1.How can I place an order for MAX6355RWUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6355RWUT 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 MAX6355RWUT reliable?
The price and inventory of MAX6355RWUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6355RWUT is usually 5 days.
3.What payment methods are accepted for MAX6355RWUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6355RWUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6355RWUT?
MAX6355RWUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6355RWUT 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 MAX6355RWUT?
For technical support, including MAX6355RWUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6355RWUT requirements.
6.How does Aetrix verify that MAX6355RWUT is sourced from the original manufacturer or authorized distributors?
All MAX6355RWUT 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 MAX6355RWUT meets industry standards.
7.What is the process for return or replacement of MAX6355RWUT?
All MAX6355RWUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6355RWUT, 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 MAX6355RWUT part is unused and in its original packaging.
Return procedure for MAX6355RWUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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