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Analog Devices Inc./Maxim Integrated MAX6357SYUT+
- Part No.:
- MAX6357SYUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6357SYUT+.pdf
- Description:
- MAX6357 TRIPLE-VOLTAGE MICROPROC
- Quantity:
- Payment:
- Shipping:
Inventory:5,799
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Product details
Overview
MAX6357SYUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC with triple-monitor capability (VCC1, VCC2, and RSTIN), featuring active-low push-pull reset output referenced to VCC2, factory-set 2.93V/2.19V thresholds, 20µA supply current, and guaranteed RESET validity down to VCC1 or VCC2 ≥ 1.0V. It is used in multivoltage embedded systems requiring reliable power-on reset and third-voltage monitoring.
For engineers reviewing the MAX6357SYUT+ datasheet, MAX6357SYUT+ pinout, MAX6357SYUT+ application, or MAX6357SYUT+ equivalent, key selection criteria include its VCC2-referenced RST output, RSTIN comparator input (1.22V threshold), SOT23-6 package, -40°C to +85°C operation, and compatibility with 1.2V–5.5V supply ranges.
Technical Context
The MAX6357SYUT+ monitors two primary supply rails (VCC1 and VCC2) with independent precision thresholds (2.93V and 2.19V), and includes a dedicated RSTIN input for monitoring a third voltage via external resistive divider. Its reset logic asserts RST when either VCC drops below its threshold or RSTIN falls below 1.22V.
It delivers an active-low push-pull reset output referenced to VCC2 - not open-drain - ensuring defined low/high states without external pull-up. The device guarantees functional reset assertion as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, enabling robust operation during brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.93V ±1.5% (factory-trimmed; enables precise +3.0V rail supervision) |
| VCC2 Threshold | 2.19V ±1.5% (factory-trimmed; supports +2.2V or +2.5V rail monitoring) |
| RSTIN Threshold | 1.22V ±0.03V (fixed internal comparator; allows third-voltage monitoring via resistor divider) |
| Supply Current | 20µA typical (enables ultra-low-power battery-backed or portable applications) |
| Reset Pulse Width | 100ms minimum (ensures reliable µP initialization across temperature) |
| Operating Temp | -40°C to +85°C (fully specified for industrial-grade embedded deployment) |
| Reset Output Type | Active-low push-pull referenced to VCC2 (eliminates need for external pull-up; drives directly into µP reset pin) |
Pinout & Package
MAX6357SYUT+ is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with 1.0mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height. Pin 1 is RST (active-low push-pull, VCC2-referenced), Pin 2 is GND, Pin 3 is MR (debounced manual reset input), Pin 4 is VCC2, Pin 5 is RSTIN (third-voltage monitor input), and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (RST) | Active-low reset output | Push-pull driver referenced to VCC2; sinks ≥1.2mA at VCC2 ≥ 2.7V; valid down to VCC2 = 1.0V |
| Pin 2 (GND) | Ground reference | Common return path for VCC1, VCC2, MR, RSTIN, and RST; must be low-impedance |
| Pin 3 (MR) | Manual reset input | Debounced TTL/CMOS-compatible active-low input; forces reset while asserted; no external pull-up required |
| Pin 4 (VCC2) | Secondary supply rail | Powers internal circuitry when VCC2 > VCC1; monitored at 2.19V threshold; defines RST output reference |
| Pin 5 (RSTIN) | Third-voltage monitor input | High-impedance comparator input (1.22V threshold); accepts external resistive divider to scale higher voltages |
| Pin 6 (VCC1) | Primary supply rail | Powers internal circuitry when VCC1 > VCC2; monitored at 2.93V threshold; supplies RSTIN bias |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (2.93V) and VCC2 (2.19V) with ±1.5% accuracy over temperature |
| Third-voltage monitoring via RSTIN | Fixed 1.22V comparator input enables flexible monitoring of any rail (e.g., 1.8V, 2.5V, 3.3V) using external resistors |
| VCC2-referenced push-pull RST | Eliminates external pull-up resistor and ensures fast, deterministic reset timing into µP reset pins |
| Guaranteed operation down to 1.0V | RESET remains valid even if VCC1 or VCC2 sags to 1.0V - critical for brownout resilience in industrial systems |
| Low 20µA quiescent current | Minimizes standby power draw in battery-powered or energy-sensitive applications without sacrificing supervision accuracy |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Supervises dual-core SoC with separate 2.8V I/O and 1.8V core rails, plus auxiliary 1.2V sensor interface rail. IC Role / Device Role / Timing Role: MAX6357SYUT+ monitors VCC1 (2.93V), VCC2 (2.19V), and RSTIN (scaled 1.2V) to generate synchronized reset pulse on power-up and fault. Use Value: Ensures deterministic boot sequence by asserting RST until all three rails stabilize above their thresholds - preventing firmware corruption during partial power-up. | Use Scenario: Powers on/off control and supply integrity check in handheld ECG device with Li-ion battery, buck-boost regulator, and analog front-end. IC Role / Device Role / Timing Role: MAX6357SYUT+ uses VCC1 (2.93V) for main system rail, VCC2 (2.19V) for analog section, and RSTIN (1.22V) to verify LDO output before enabling ADC. Use Value: 20µA supply current extends battery life; 100ms reset pulse guarantees full analog settling before data acquisition begins. |
| Automotive Infotainment Head Unit | Smart Energy Meter |
Use Scenario: Monitors 3.3V MCU domain, 2.5V display interface, and 1.2V real-time clock backup rail in harsh thermal environment. IC Role / Device Role / Timing Role: MAX6357SYUT+ applies VCC1 = 3.3V (2.93V threshold), VCC2 = 2.5V (2.19V threshold), and RSTIN = RTC rail (via divider); RST output tied to MCU reset. Use Value: -40°C to +85°C guaranteed operation ensures reliability across vehicle cabin temperatures; push-pull RST prevents contention with bidirectional MCU reset pins. | Use Scenario: Validates isolated DC-DC outputs (5V logic, 3.3V comms, 1.8V metrology ADC) in utility-grade meter with tamper detection. IC Role / Device Role / Timing Role: MAX6357SYUT+ assigns VCC1 to 5V rail (2.93V threshold), VCC2 to 3.3V rail (2.19V), and RSTIN to 1.8V metrology rail (via 1.22V comparator). Use Value: Triple monitoring replaces three discrete supervisors, reducing BOM count and PCB area; guaranteed 1.0V operation maintains reset integrity during line dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6357SUT+ | Same pinout and function but lead-free only; identical electrical specs and thresholds | No functional difference; differs only in RoHS compliance marking and packaging | Select MAX6357SUT+ if lead-free compliance is mandatory and tape-and-reel delivery is acceptable |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no RSTIN input; open-drain RST; 1.6µA IQ | Lacks dual/third-rail monitoring; requires external pull-up; unsuitable for multivoltage coordination | Use only for single-rail systems where ultra-low IQ outweighs missing supervision features |
Compared with MAX6357SUT+, the MAX6357SYUT+ offers identical functionality with explicit suffix identification of SY threshold pair; versus TPS3808G33DBVR, it provides true triple-rail supervision and push-pull drive - eliminating layout compromises in complex power architectures.
Availability
MAX6357SYUT+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive infotainment head units, smart energy meters, and battery-powered instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for MAX6357SYUT+ 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, communications, and consumer applications.
The MAX6351–MAX6360 family was engineered to replace discrete reset circuits and multiple single-rail supervisors in multivoltage systems - delivering coordinated, low-power, temperature-stable reset generation with minimal external components.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6357SYUT+?
The MAX6357SYUT+ has factory-set thresholds of 2.93V for VCC1 and 2.19V for VCC2, each with ±1.5% tolerance over the full -40°C to +85°C range. These values correspond to the "SY" suffix per Maxim's Voltage Threshold Levels table and are laser-trimmed during production for high accuracy without calibration.
Does the MAX6357SYUT+ provide a watchdog timer function?
No, the MAX6357SYUT+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants. The MAX6357SYUT+ belongs to the MAX6355/MAX6356/MAX6357 subgroup, which adds the RSTIN third-voltage monitor input but omits WDI circuitry.
How is the RST output referenced, and what are its drive capabilities on the MAX6357SYUT+?
The RST output of the MAX6357SYUT+ is an active-low push-pull driver referenced to VCC2. It can sink ≥1.2mA when VCC2 ≥ 2.7V and VCC2 ≥ 1.0V, with VOL ≤ 0.3V. This eliminates the need for an external pull-up resistor and ensures clean, fast reset assertion compatible with standard µP reset inputs.
Can the MAX6357SYUT+ monitor a 1.8V supply rail, and how is that implemented?
Yes, the MAX6357SYUT+ can monitor a 1.8V rail using its RSTIN pin. Since RSTIN has a fixed 1.22V internal threshold, a resistive divider (e.g., R1 = 47kΩ, R2 = 100kΩ) scales the 1.8V input to ~1.22V at RSTIN. The MAX6357SYUT+ datasheet Figure 2 provides the exact calculation: VEXT_TH = 1.22V × (1 + R1/R2).
What is the minimum supply voltage required for the MAX6357SYUT+ to guarantee valid reset output?
The MAX6357SYUT+ guarantees valid RST output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - a key feature for brownout resilience. This is explicitly tested and specified in the Absolute Maximum Ratings and Electrical Characteristics tables, ensuring reset integrity even during deep supply sag.
MAX6357SYUT+ 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:
- 2.19V, 2.93V
- 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
MAX6357SYUT+ FAQ
1.How can I place an order for MAX6357SYUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6357SYUT+ 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 MAX6357SYUT+ reliable?
The price and inventory of MAX6357SYUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6357SYUT+ is usually 5 days.
3.What payment methods are accepted for MAX6357SYUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6357SYUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6357SYUT+?
MAX6357SYUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6357SYUT+ 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 MAX6357SYUT+?
For technical support, including MAX6357SYUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6357SYUT+ requirements.
6.How does Aetrix verify that MAX6357SYUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6357SYUT+ 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 MAX6357SYUT+ meets industry standards.
7.What is the process for return or replacement of MAX6357SYUT+?
All MAX6357SYUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6357SYUT+, 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 MAX6357SYUT+ part is unused and in its original packaging.
Return procedure for MAX6357SYUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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