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Analog Devices Inc./Maxim Integrated MAX6357UVUT+T
- Part No.:
- MAX6357UVUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6357UVUT+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,043
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Product details
Overview
MAX6357UVUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC2, precision factory-set thresholds of 2.78V (VCC1) and 1.58V (VCC2), and an adjustable third-voltage monitor input (RSTIN) with 1.22V threshold. It operates over –40°C to +85°C in a 6-pin SOT23 package and is used in multivoltage embedded systems requiring reliable power-up sequencing and undervoltage detection.
For engineers reviewing the MAX6357UVUT+T datasheet, MAX6357UVUT+T pinout, MAX6357UVUT+T application, or MAX6357UVUT+T equivalent, key selection criteria include its dual-supply monitoring capability, guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, 100ms minimum reset pulse width, and support for third-voltage monitoring via external resistive divider on RSTIN.
Technical Context
The MAX6357UVUT+T integrates three independent voltage-monitoring comparators: one for VCC1 (2.78V threshold), one for VCC2 (1.58V threshold), and one for the externally adjustable RSTIN input (1.22V internal reference). Reset assertion occurs if any monitored supply falls below its trip point, and the active-low push-pull RST2 output remains valid as long as either VCC1 or VCC2 exceeds +1.0V.
It features a debounced TTL/CMOS-compatible manual-reset input (MR), supports no external components for dual-supply supervision, and guarantees operation across –40°C to +85°C with 20μA typical supply current. Unlike MAX6358–MAX6360 variants, it does not include a watchdog timer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.78V ±0.08V (–40°C to +85°C); precise factory-trimmed for stable 2.7V system rail monitoring |
| VCC2 Threshold | 1.58V ±0.07V (–40°C to +85°C); enables reliable detection of 1.5V/1.6V logic or memory rails |
| RSTIN Threshold | 1.22V ±0.03V (–40°C to +85°C); allows third-voltage monitoring (e.g., 1.8V, 2.5V, 3.3V) via external resistor divider |
| Reset Pulse Width | 100ms minimum; ensures sufficient duration for full microprocessor initialization and state clearing |
| Supply Current | 20μA typical at +25°C; enables battery-backed or low-power portable applications without significant drain |
| Operating Temp | –40°C to +85°C; fully specified for industrial-grade embedded systems and automotive under-hood peripherals |
| RESET Validity | Guaranteed while VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; supports brownout recovery and graceful shutdown sequences |
Pinout & Package
MAX6357UVUT+T is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height - compatible with standard high-density PCB assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST2 | Active-low push-pull reset output referenced to VCC2; drives low during fault, high otherwise; no external pullup required |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic; must be connected to system ground plane |
| 3 | MR | Debounced manual-reset input; asserted low forces RST2 active; internally pulled up (~63.5kΩ); accepts TTL/CMOS levels |
| 4 | VCC2 | Secondary supply input and monitor rail; powers internal circuitry when VCC2 > VCC1; threshold = 1.58V |
| 5 | RSTIN | Adjustable undervoltage comparator input; monitors third voltage via external divider; internal 1.22V reference sets trip point |
| 6 | VCC1 | Primary supply input and monitor rail; powers internal circuitry when VCC1 > VCC2; threshold = 2.78V |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises VCC1 (2.78V), VCC2 (1.58V), and third voltage via RSTIN - eliminates need for multiple discrete supervisors |
| Factory-trimmed thresholds | ±1.5% accuracy over temperature avoids calibration overhead and improves BOM consistency across production batches |
| Push-pull RST2 output | Drives actively high/low without external pullup; reduces component count and simplifies interface to 1.5V/1.8V microcontrollers |
| 1.0V reset validity | Ensures deterministic reset behavior during deep brownout conditions where VCC drops near 1.0V - critical for fail-safe shutdown |
| No external timing components | Internal oscillator and RC network generate fixed 100ms+ reset timeout; removes capacitor tolerance and aging concerns |
Applications
| Industrial PLC I/O Modules | Battery-Powered Medical Sensors |
|---|---|
Use Scenario: Monitoring 2.8V MCU core rail, 1.6V ADC reference rail, and 3.3V sensor interface rail in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RST2 to hold MCU in reset until all rails stabilize post-power-up or during transient dips. Use Value: Prevents firmware corruption by guaranteeing synchronized reset release only after VCC1 ≥ 2.78V, VCC2 ≥ 1.58V, and third rail ≥ 1.22V × divider ratio. | Use Scenario: Supervising lithium coin-cell–powered wearable sensor node with 2.7V BLE SoC, 1.5V analog front-end, and 3.0V op-amp bias rail. IC Role / Device Role / Timing Role: Detects undervoltage on primary (2.78V) and secondary (1.58V) supplies while using RSTIN to monitor boosted 3.0V rail via 1.22V reference. Use Value: Enables ultra-low-power operation (20μA quiescent) while ensuring safe shutdown before battery depletion compromises data integrity. |
| Multivoltage FPGA Configuration Systems | Automotive Body Control Modules |
Use Scenario: Managing power sequencing for Xilinx Artix-7 FPGA requiring 2.5V bank, 1.8V core, and 1.2V auxiliary rails during cold-start. IC Role / Device Role / Timing Role: Uses RSTIN to monitor 2.5V rail (via 1.22V × 2.05 ratio), VCC1 for 1.8V rail (2.78V threshold unused but accommodated), VCC2 for 1.2V rail (1.58V threshold provides margin). Use Value: Delivers 100ms minimum reset pulse to meet FPGA configuration timing requirements without external RC networks. | Use Scenario: Supervising 2.8V infotainment MCU, 1.5V CAN transceiver, and 5.0V display backlight driver in a 12V automotive subsystem. IC Role / Device Role / Timing Role: Monitors 2.78V rail (VCC1) for MCU, 1.58V rail (VCC2) for transceiver, and uses RSTIN (with divider) to supervise 5.0V rail. Use Value: Guarantees RESET remains valid down to VCC1 = 1.0V or VCC2 = 1.0V - essential for robust operation during cranking-induced voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6356UVUT+T | Same package and thresholds (2.78V/1.58V), but RST1 output referenced to VCC1 instead of RST2 referenced to VCC2 | Used when reset signal must be level-shifted to primary supply domain rather than secondary | Select MAX6356UVUT+T if system requires active-low reset referenced to VCC1; MAX6357UVUT+T is optimal when reset must drive loads tied to VCC2 domain |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no RSTIN input or dual-threshold capability; 350nA quiescent current | Limited to single-rail monitoring; requires additional ICs for multivoltage systems | Choose TPS3808G33DBVR only for cost-sensitive single-rail designs; MAX6357UVUT+T provides integrated triple monitoring with no BOM expansion |
Compared with MAX6356UVUT+T, MAX6357UVUT+T delivers identical voltage thresholds and temperature range but routes the reset output to the VCC2 domain - enabling direct interfacing with peripherals powered by the lower-voltage rail. Versus TPS3808G33DBVR, it offers triple-supply supervision in one device, eliminating inter-IC coordination delays and reducing board space by ~60%.
Availability
MAX6357UVUT+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered medical sensors, and multivoltage FPGA configuration systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX6357UVUT+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The MAX6351–MAX6360 family was designed to replace discrete supervisory solutions in multivoltage embedded systems, delivering precision threshold monitoring, low quiescent current, and compact SOT23 packaging for space-constrained designs.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6357UVUT+T?
The MAX6357UVUT+T has a factory-trimmed VCC1 threshold of 2.78V (±0.08V over –40°C to +85°C) and a VCC2 threshold of 1.58V (±0.07V over the same range). These values are confirmed in the Voltage Threshold Levels table and Electrical Characteristics section of the official datasheet, and apply specifically to the UV suffix variant of the MAX6357UVUT+T.
Does the MAX6357UVUT+T include a watchdog timer function?
No, the MAX6357UVUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358, MAX6359, and MAX6360 variants in the same family. The MAX6357UVUT+T is specifically configured for triple-voltage supervision only - monitoring VCC1, VCC2, and a third voltage via the RSTIN pin - with no WDI input or associated timeout circuitry.
How is the third voltage monitored using the RSTIN pin on the MAX6357UVUT+T?
The RSTIN pin on the MAX6357UVUT+T connects to an internal 1.22V comparator reference. To monitor a third voltage higher than 1.22V (e.g., 3.3V or 5.0V), a resistive divider must be placed between that rail and RSTIN, with the divider ratio selected so that the voltage at RSTIN equals 1.22V at the desired trip point. The MAX6357UVUT+T datasheet provides the formula VEXT = 1.22V × (R1 + R2)/R2 for calculating resistor values.
What is the output type and drive capability of the reset pin on the MAX6357UVUT+T?
The MAX6357UVUT+T features an active-low push-pull RST2 output referenced to VCC2. It can sink up to 1.2mA at VCC2 ≥ 2.7V (VOL ≤ 0.3V) and source 350µA at VCC2 ≥ 2.7V (VOH ≥ 0.8 × VCC2). This eliminates the need for an external pullup resistor and ensures clean, fast transitions compatible with 1.5V–3.3V logic families.
Can the MAX6357UVUT+T operate reliably when one supply drops below 1.0V?
Yes - the MAX6357UVUT+T guarantees valid reset output (RST2) as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per Absolute Maximum Ratings and Electrical Characteristics. This "1.0V validity" ensures deterministic reset behavior during brownout conditions, allowing controlled shutdown even when one supply collapses - a key reliability feature confirmed for the MAX6357UVUT+T across its full operating temperature range.
MAX6357UVUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.58V, 2.78V, 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-6
MAX6357UVUT+T FAQ
1.How can I place an order for MAX6357UVUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6357UVUT+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 MAX6357UVUT+T reliable?
The price and inventory of MAX6357UVUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6357UVUT+T is usually 5 days.
3.What payment methods are accepted for MAX6357UVUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6357UVUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6357UVUT+T?
MAX6357UVUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6357UVUT+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 MAX6357UVUT+T?
For technical support, including MAX6357UVUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6357UVUT+T requirements.
6.How does Aetrix verify that MAX6357UVUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6357UVUT+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 MAX6357UVUT+T meets industry standards.
7.What is the process for return or replacement of MAX6357UVUT+T?
All MAX6357UVUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6357UVUT+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 MAX6357UVUT+T part is unused and in its original packaging.
Return procedure for MAX6357UVUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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