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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:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,080
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Product details
Overview
The MAX6357TZUT from Maxim Integrated is a dual-voltage microprocessor supervisory IC with triple-monitor capability (VCC1, VCC2, and RSTIN), featuring active-low push-pull reset referenced to VCC2, precision factory-set thresholds of 3.08V (VCC1) and 2.32V (VCC2), 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 undervoltage detection.
For engineers reviewing the MAX6357TZUT datasheet, MAX6357TZUT pinout, MAX6357TZUT application, or MAX6357TZUT equivalent, key selection considerations include its SOT23-6 package, dual-supply monitoring with third-voltage comparator input, reset timeout of 100–280ms, and compatibility with +1.8V/+2.5V/+3.3V rail supervision in portable and industrial controllers.
Technical Context
The MAX6357TZUT monitors two primary supply rails (VCC1 and VCC2) and a third external voltage via the RSTIN pin with a fixed 1.22V internal threshold, enabling flexible tri-rail supervision using an external resistive divider. Its reset output (RST2) is push-pull and referenced to VCC2, ensuring robust drive strength without external pull-up.
It includes a debounced manual reset input (MR), supports operation over –40°C to +85°C, and guarantees functional reset assertion as long as either VCC1 or VCC2 remains ≥ 1.0V - critical for brown-out resilience in battery-backed or dynamically powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±30mV (factory-trimmed; ensures precise +3.3V rail monitoring) |
| VCC2 Threshold | 2.32V ±30mV (factory-trimmed; enables accurate +2.5V or +2.3V rail supervision) |
| RSTIN Threshold | 1.22V ±6mV (fixed internal comparator; supports third-voltage monitoring via external divider) |
| Reset Timeout | 100–280ms (guaranteed minimum pulse width ensures µP initialization completion) |
| Supply Current | 20µA typical (ultra-low quiescent current extends battery life in portable equipment) |
| Operating Temp | –40°C to +85°C (fully specified across industrial temperature range) |
| RESET Valid Down To | VCC1 ≥ 1.0V or VCC2 ≥ 1.0V (enables valid reset assertion during deep brown-out) |
Pinout & Package
MAX6357TZUT is housed in a 6-pin SOT23-6 package with 1.6mm × 2.9mm footprint, 0.95mm height, and gull-wing leads - compatible with standard reflow assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST2 | Active-low push-pull reset output | Referenced to VCC2; drives low during fault; no external pull-up required |
| 2 - GND | Ground reference | Common return path for all internal circuitry and monitored supplies |
| 3 - MR | Debounced manual reset input | Active-low; forces reset when pulled ≤ 0.3×VCC1; internally pulled up ~63.5kΩ |
| 4 - VCC2 | Secondary supply input | Powers device when > VCC1; monitored at 2.32V threshold |
| 5 - RSTIN | Third-voltage monitor input | Accepts external voltage divider; asserts reset if input < 1.22V |
| 6 - VCC1 | Primary supply input | Powers device when > VCC2; monitored at 3.08V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage thresholds | Factory-set 3.08V/2.32V pair eliminates external resistor networks for dual-rail systems |
| Third-voltage comparator input (RSTIN) | 1.22V internal reference enables monitoring of +1.2V, +1.8V, or custom rails via resistive divider |
| Push-pull RST2 referenced to VCC2 | Eliminates need for external pull-up resistor; ensures fast, rail-consistent logic levels |
| Guaranteed reset validity to 1.0V | Ensures deterministic reset behavior during severe brown-out conditions before full power collapse |
| 20µA ultra-low supply current | Minimizes system standby power draw - critical for battery-powered instrumentation and IoT edge nodes |
Applications
| Industrial PLC I/O Modules | Portable Medical Monitors |
|---|---|
Use Scenario: Supervising +3.3V microcontroller core and +2.5V analog front-end while monitoring +1.2V ADC reference rail. IC Role / Device Role / Timing Role: Dual-threshold supervisor with third-voltage comparator provides coordinated reset across three critical domains. Use Value: Prevents erratic MCU behavior during partial rail collapse; eliminates need for three discrete supervisors. | Use Scenario: Power sequencing and fault detection in handheld ECG devices powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Ensures clean boot and continuous voltage integrity monitoring of processor, sensor bias, and display driver rails. Use Value: 20µA quiescent current extends battery runtime; 100ms+ reset pulse guarantees firmware initialization. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Monitoring +5V system bus and +3.3V CAN transceiver supply in under-hood modules. IC Role / Device Role / Timing Role: Dual-supply watchdog-free supervisor providing fail-safe reset under wide temperature and transient conditions. Use Value: –40°C to +85°C rating and transient immunity ensure reliability in harsh automotive environments. | Use Scenario: Supervising +3.3V metrology SoC and +2.3V RTC backup supply in tamper-resistant meter designs. IC Role / Device Role / Timing Role: Provides rail-specific reset assertion and brown-out hold-off via VCC1/VCC2 threshold independence. Use Value: Guaranteed RESET validity to 1.0V prevents spurious resets during capacitor discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6357TUT-T | Same thresholds (3.08V/2.32V), identical functionality, but in tape-and-reel packaging only - no functional difference | No difference; same use cases and PCB layout | Select MAX6357TUT-T for high-volume automated assembly where reel packaging is required |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); lacks VCC2 monitoring and RSTIN input; 35µA ICC vs. 20µA | Only suitable for single-rail systems; cannot replace tri-rail supervision role of MAX6357TZUT | Choose only if supervising one rail and board space allows separate supervision for other rails |
Compared with MAX6357TUT-T, the MAX6357TZUT offers identical electrical performance but differs only in packaging marking (ZUT denotes lead-free SOT23-6); versus TPS3808G33DBVR, it delivers true dual/third-rail supervision with lower ICC and broader voltage coverage - essential for integrated multirail reset coordination.
Availability
MAX6357TZUT is available at Aetrix Electronics and suitable for industrial PLCs, portable medical monitors, automotive body control units, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature and long product 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) designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing applications.
The MAX6351–MAX6360 family was engineered specifically for multivoltage microprocessor supervision - delivering integrated dual-threshold detection, third-voltage monitoring, and ultra-low-power reset generation in minimal SOT23 footprints.
FAQ
What is the function of the RSTIN pin on the MAX6357TZUT?
The RSTIN pin on the MAX6357TZUT is a dedicated third-voltage monitor input with a fixed 1.22V internal threshold. It allows supervision of an additional supply rail (e.g., +1.2V, +1.8V) using an external resistive divider. When the divided voltage falls below 1.22V, the device asserts the RST2 output. This feature makes the MAX6357TZUT uniquely capable of tri-rail supervision without external comparators or resistors beyond the divider network.
Does the MAX6357TZUT provide watchdog timer functionality?
No, the MAX6357TZUT does not include a watchdog timer. Watchdog capability is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6357TZUT belongs to the MAX6355/MAX6356/MAX6357 subgroup, which adds the RSTIN third-voltage input but omits the WDI pin and associated timer circuitry. Its pin 5 is RSTIN, not WDI - confirmed by the Pin Description table and functional diagram in the datasheet.
What are the exact voltage thresholds programmed into the MAX6357TZUT?
The MAX6357TZUT has factory-programmed thresholds of 3.08V for VCC1 and 2.32V for VCC2, as indicated by the "TZ" suffix in the Voltage Threshold Levels table. These values are trimmed during production and guaranteed over temperature: VTH1 = 3.00V to 3.15V and VTH2 = 2.25V to 2.38V (–40°C to +85°C). The 3.08V/2.32V pairing targets +3.3V and +2.5V system rails with appropriate hysteresis margins.
Can the MAX6357TZUT operate with only one supply voltage connected?
Yes - the MAX6357TZUT guarantees valid RST2 output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. If only VCC1 is present (e.g., VCC2 unconnected or grounded), the device operates and monitors VCC1 against its 3.08V threshold; RST2 remains functional and referenced to VCC2 only if VCC2 is powered. However, per Absolute Maximum Ratings, VCC2 must be ≥ –0.3V and ≤ +6V even when unused, and RSTIN must not exceed VCC1. For single-rail use, tie unused VCC2 to GND via a 100nF bypass capacitor.
Is the MAX6357TZUT pin-compatible with other parts in the MAX6351–MAX6360 family?
The MAX6357TZUT uses the 6-pin SOT23-6 package and shares identical pinout with MAX6355, MAX6356, MAX6358, MAX6359, and MAX6360 - pin 1 = RST2, pin 2 = GND, pin 3 = MR, pin 4 = VCC2, pin 5 = RSTIN, pin 6 = VCC1. However, electrical functionality differs: MAX6357TZUT has RSTIN (not WDI or open-drain RST), and its RST2 is push-pull referenced to VCC2. Swapping with MAX6358 (WDI) or MAX6355 (open-drain RST) would cause interface failure unless circuitry is redesigned.
MAX6357TZUT 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:
- 2.32V, 3.08V, Adj
- 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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