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Analog Devices Inc./Maxim Integrated MAX6357TZUT+
- Part No.:
- MAX6357TZUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6357TZUT+.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,372
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Product details
Overview
MAX6357TZUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with precision reset monitoring for VCC1 and VCC2, plus a third adjustable voltage monitor input (RSTIN), housed in a 6-pin SOT23 package. It features active-low push-pull RESET output referenced to VCC2, 3.08V/2.32V factory-set thresholds, 20µA supply current, and guaranteed RESET validity down to VCC1 or VCC2 = 1.0V - used in multivoltage embedded systems requiring reliable power-on reset and brownout detection.
For engineers reviewing the MAX6357TZUT+ datasheet, MAX6357TZUT+ pinout, MAX6357TZUT+ application, or MAX6357TZUT+ equivalent, this page delivers verified electrical parameters, exact pin functions, real-world use cases in battery-powered controllers and industrial multirail systems, and two validated alternative parts with documented functional and application differences.
Technical Context
The MAX6357TZUT+ monitors three voltage rails: VCC1 (3.08V threshold), VCC2 (2.32V threshold), and an external rail via RSTIN (1.22V comparator reference). Its RESET output is push-pull and referenced to VCC2, ensuring robust drive strength without external pull-ups.
It includes a debounced manual reset (MR) input and supports system-level reliability through guaranteed operation over –40°C to +85°C, 100ms minimum reset pulse width, and immunity to short VCC transients (≤200µs at 0.5V overdrive). No external components are required for dual-supply supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±3% (factory-trimmed; enables precise +3.3V rail monitoring) |
| VCC2 Threshold | 2.32V ±3% (factory-trimmed; enables precise +2.5V or +2.4V rail monitoring) |
| RSTIN Threshold | 1.22V ±6mV (internal reference; allows third-rail monitoring via resistive divider) |
| Supply Current | 20µA typical (enables ultra-low-power operation in battery-backed systems) |
| Reset Pulse Width | 100ms minimum (ensures reliable µP initialization across temperature) |
| RESET Output Type | Active-low push-pull referenced to VCC2 (eliminates need for external pull-up; drives directly into µP reset pin) |
| Operating Temp | –40°C to +85°C (fully specified; suitable for industrial and automotive-adjacent environments) |
Pinout & Package
MAX6357TZUT+ is packaged in a 6-pin SOT23 (SOT-23-6) surface-mount package with 1.27mm pitch, JEDEC MO-178AA compliant, footprint compatible with standard SOT-23 pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull RESET output referenced to VCC2; asserts when VCC1 < 3.08V or VCC2 < 2.32V or RSTIN < 1.22V |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic |
| 3 | MR | Debounced active-low manual reset input; forces RESET assertion when pulled low |
| 4 | VCC2 | Secondary supply input and monitoring rail; powers internal circuitry when >1.0V; sets RESET reference level |
| 5 | RSTIN | Adjustable undervoltage monitor input; compares external divided voltage against 1.22V reference |
| 6 | VCC1 | Primary supply input and monitoring rail; powers internal circuitry when >1.0V; defines MR and RSTIN voltage domain |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold voltage monitoring | Simultaneous 3.08V and 2.32V detection with ±3% accuracy ensures deterministic reset timing for +3.3V/+2.5V systems |
| Third-rail adjustable monitor (RSTIN) | 1.22V internal reference enables monitoring of any rail ≥1.22V using two external resistors - no additional IC needed |
| Push-pull RESET referenced to VCC2 | Eliminates external pull-up resistor and associated board space; provides full rail-swing drive into µP reset pin |
| Guaranteed RESET validity to 1.0V | Ensures clean reset assertion even during deep brownout conditions on either VCC1 or VCC2 |
| 20µA quiescent current | Enables integration into always-on subsystems (e.g., RTC backup, wake-on-event circuits) without compromising battery life |
Applications
| Industrial PLC I/O Modules | Medical Portable Monitors |
|---|---|
Use Scenario: Multirail power sequencing in DIN-rail mounted I/O modules with isolated +5V, +3.3V, and +2.4V supplies. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting RESET until both +3.3V and +2.4V rails stabilize; RSTIN monitors isolated auxiliary bias rail. Use Value: Prevents firmware lockup during cold-start by guaranteeing µP reset until all critical rails exceed factory-trimmed thresholds. |
Use Scenario: Battery-powered ECG and SpO₂ monitors with separate analog front-end (+2.5V), digital core (+3.0V), and sensor bias (+1.8V) rails. IC Role / Device Role / Timing Role: MAX6357TZUT+ monitors +3.08V (core) and +2.32V (AFE) rails while RSTIN tracks +1.8V via divider - triggering unified reset on any rail fault. Use Value: Single-chip supervision replaces discrete comparators and reduces BOM count by 3–4 components without sacrificing accuracy or temperature stability. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Low-voltage subsystems in BCMs powered from switched 12V (regulated to +5V) and always-on 5V LDO outputs. IC Role / Device Role / Timing Role: Supervises main +5V (VCC1) and always-on +2.5V (VCC2); MR tied to ignition signal; RESET drives µP with VCC2-referenced logic swing. Use Value: Ensures deterministic boot after key-on by holding reset until both regulated rails settle - immune to load-dump transients due to built-in glitch filtering. |
Use Scenario: Revenue-grade meters with isolated MCU, metrology ADC (+2.5V), and RF modem (+3.3V) domains operating from single Li-ion or supercapacitor source. IC Role / Device Role / Timing Role: Monitors primary +3.08V (modem) and secondary +2.32V (metrology) rails; RSTIN watches backup rail voltage to trigger graceful shutdown before cutoff. Use Value: Enables certified data retention during brownout by synchronizing µP reset with last valid energy measurement window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6357TTUT+ | VCC1 threshold = 3.08V, VCC2 threshold = 2.93V (TS suffix); same pinout, package, and RSTIN functionality | Better suited for +3.3V/+3.0V dual-rail systems where tighter VCC2 margin is acceptable | Select when monitoring higher secondary rail; verify RSTIN divider ratio remains within 1.22V tolerance under worst-case VCC1 variation |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no RSTIN input; open-drain RESET; requires external pull-up | Lacks dual/third-rail capability; limited to single-rail applications with simpler power architecture | Choose only if system uses only one monitored rail and board space permits pull-up resistor; not drop-in for MAX6357TZUT+ |
Compared with MAX6357TZUT+, MAX6357TTUT+ offers higher VCC2 threshold for tighter +3.0V rail control but reduced headroom for lower-voltage secondaries, while TPS3808G33DBVR sacrifices multirail supervision and push-pull drive for lower cost and smaller footprint in single-rail designs.
Availability
MAX6357TZUT+ is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, automotive body electronics, smart energy meters, and battery-backed instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6357TZUT+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX6351–MAX6360 family was designed specifically for multivoltage microprocessor supervision in space-constrained, reliability-critical systems - delivering precision threshold monitoring, integrated manual reset, and optional third-rail sensing without external components.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6357TZUT+?
The MAX6357TZUT+ has factory-trimmed reset thresholds of 3.08V for VCC1 and 2.32V for VCC2, each with ±3% tolerance over –40°C to +85°C. These values are defined by the "TZ" suffix per Maxim's Voltage Threshold Levels table and are fully tested and guaranteed - not typical-only specifications. The MAX6357TZUT+ uses these precise thresholds to ensure deterministic reset behavior in +3.3V and +2.5V rail systems.
Does the MAX6357TZUT+ include a watchdog timer function?
No, the MAX6357TZUT+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants (identified by "U", "V", or "W" suffixes in the WDI column of the Selector Guide). The MAX6357TZUT+ belongs to the MAX6355/MAX6356/MAX6357 subgroup, which adds the RSTIN third-voltage monitor but omits WDI. This makes MAX6357TZUT+ ideal for applications needing triple-rail supervision without watchdog complexity.
What is the function and voltage range of the RSTIN pin on the MAX6357TZUT+?
The RSTIN pin on the MAX6357TZUT+ is an adjustable undervoltage monitor input with a precise 1.22V internal reference (±6mV). It accepts an externally divided voltage - for example, a resistor divider from a +5V rail to generate ~1.22V at RSTIN - and asserts RESET if that voltage falls below threshold. RSTIN is powered from VCC1, so its input must not exceed VCC1. This feature enables monitoring of a third rail without adding a separate supervisor IC.
Is the RESET output of the MAX6357TZUT+ push-pull or open-drain, and what is its reference rail?
The RESET output of the MAX6357TZUT+ is active-low push-pull and referenced to VCC2. This means it actively drives low (to GND) and high (to VCC2), eliminating the need for an external pull-up resistor. The VCC2 reference ensures logic compatibility with peripherals powered by the same rail. This differs from open-drain variants like MAX6352/MAX6355 and from VCC1-referenced push-pull versions like MAX6356 - confirming MAX6357TZUT+'s role in VCC2-centric system architectures.
Can the MAX6357TZUT+ operate with supply voltages below 2.0V on either rail?
Yes - the MAX6357TZUT+ guarantees full functionality and valid RESET output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per Absolute Maximum Ratings and Electrical Characteristics tables. Its 2.32V VCC2 threshold and 3.08V VCC1 threshold remain accurate down to 1.2V supply (per spec), and the device draws only 20µA typical. This enables use in deep-brownout scenarios such as battery-failover circuits or energy-harvesting systems where rails decay slowly.
MAX6357TZUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.32V, 3.08V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6357TZUT+ FAQ
1.How can I place an order for MAX6357TZUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6357TZUT+ 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 MAX6357TZUT+ reliable?
The price and inventory of MAX6357TZUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6357TZUT+ is usually 5 days.
3.What payment methods are accepted for MAX6357TZUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6357TZUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6357TZUT+?
MAX6357TZUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6357TZUT+ 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 MAX6357TZUT+?
For technical support, including MAX6357TZUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6357TZUT+ requirements.
6.How does Aetrix verify that MAX6357TZUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6357TZUT+ 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 MAX6357TZUT+ meets industry standards.
7.What is the process for return or replacement of MAX6357TZUT+?
All MAX6357TZUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6357TZUT+, 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 MAX6357TZUT+ part is unused and in its original packaging.
Return procedure for MAX6357TZUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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