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Analog Devices Inc./Maxim Integrated MAX6358MSUT
- Part No.:
- MAX6358MSUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6358MSUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:462
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Product details
Overview
MAX6358MSUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with open-drain active-low reset output, 4.38V VCC1 threshold, 2.93V VCC2 threshold, 46.4s watchdog startup timeout, and 2.9s normal watchdog timeout. It monitors two independent supply rails in multivoltage systems and asserts reset if either drops below its preset threshold - used in portable battery-powered equipment requiring reliable power-up sequencing and runtime fault detection.
For engineers reviewing the MAX6358MSUT datasheet, MAX6358MSUT pinout, MAX6358MSUT application, or MAX6358MSUT equivalent, key selection criteria include dual-supply monitoring capability, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, 20µA quiescent current, SOT23-6 package compatibility, and integrated watchdog timer with configurable startup/normal modes.
Technical Context
The MAX6358MSUT implements a dual-threshold voltage monitor with independent trip points for VCC1 (4.38V) and VCC2 (2.93V), asserting reset whenever either supply falls below its respective threshold. Its watchdog timer features two distinct timeout periods: 46.4s startup mode for system initialization and 2.9s normal mode for runtime supervision.
It uses an open-drain RST output referenced to VCC1, requiring external pull-up, and includes a debounced TTL/CMOS-compatible manual-reset input (MR). The device guarantees functional operation over -40°C to +85°C and maintains valid reset state as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.38V ±0.08V at +25°C; factory-trimmed precision level enabling accurate monitoring of +4.5V nominal supplies |
| VCC2 Threshold | 2.93V ±0.05V at +25°C; supports reliable supervision of +3.0V or +3.3V auxiliary rails |
| Watchdog Startup Timeout | 46.4s typical; provides extended boot window for complex firmware initialization before watchdog enforcement begins |
| Watchdog Normal Timeout | 2.9s typical; ensures rapid processor lockup detection during steady-state operation |
| Supply Current | 20µA typical at VCC1 = 5.5V, VCC2 = 3.6V; enables ultra-low-power operation in battery-backed systems |
| Reset Pulse Width | 100ms minimum; meets standard µP reset timing requirements without external timing components |
| Operating Temperature | -40°C to +85°C; qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MAX6358MSUT is housed in a 6-pin SOT23 package (U6-1 outline), surface-mount compatible with standard reflow profiles and footprint 90-0175. Pin 1 is RST (open-drain active-low reset), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is VCC2, Pin 5 is WDI (watchdog input), and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Open-drain active-low reset output | Requires external pull-up; asserts low when VCC1 < 4.38V or VCC2 < 2.93V; compatible with mixed-voltage logic interfaces |
| 2 (GND) | Ground reference | Common return path for all internal circuitry; must be connected directly to system ground plane |
| 3 (MR) | Debounced manual-reset input | Pull low to force reset; internally debounced to reject noise; remains active for timeout period after release |
| 4 (VCC2) | Secondary supply input & monitor rail | Monitors 2.93V threshold; powers device when above VCC1; valid operation requires VCC2 ≥ 1.2V |
| 5 (WDI) | Watchdog timer input | Edge-triggered; reset issued if no transition occurs within 2.9s (normal) or 46.4s (startup); left floating disables watchdog |
| 6 (VCC1) | Primary supply input & monitor rail | Monitors 4.38V threshold; powers device when above VCC2; valid operation requires VCC1 ≥ 1.2V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage thresholds | Factory-set 4.38V (VCC1) and 2.93V (VCC2) enable precise supervision of asymmetric supply pairs like +4.5V/+3.0V |
| Two-mode watchdog timer | 46.4s startup timeout allows full system boot; 2.9s normal timeout ensures fast response to processor hang |
| Guaranteed RESET validity to 1.0V | Output remains asserted and valid even as either VCC1 or VCC2 decays to 1.0V - critical for brownout recovery |
| 20µA supply current | Enables integration into always-on subsystems without compromising battery life in portable equipment |
| Power-supply transient immunity | Rejects short negative transients on VCC1/VCC2 per published graphs - reduces false resets in noisy environments |
Applications
| Portable Battery-Powered Equipment | Industrial Controllers |
|---|---|
|
Use Scenario: Handheld test instruments with dual-rail power (e.g., +4.5V analog front-end, +3.0V digital core) operating from Li-ion battery. IC Role / Device Role / Timing Role: Supervises both rails and triggers watchdog reset if firmware stalls during measurement cycles. Use Value: Prevents silent failure during field use; 20µA quiescent current extends battery runtime between charges. |
Use Scenario: Programmable logic controller (PLC) I/O module with separate +4.5V sensor interface and +2.93V FPGA domain. IC Role / Device Role / Timing Role: Monitors rail integrity and asserts reset on undervoltage; provides 46.4s startup window for FPGA configuration. Use Value: Ensures deterministic boot sequence and eliminates need for discrete RC reset circuits. |
| Intelligent Instruments | Multivoltage Embedded Systems |
|
Use Scenario: Digital multimeter with segmented LCD, microcontroller, and precision ADC powered from split supplies. IC Role / Device Role / Timing Role: Generates clean power-on reset pulse and detects brownout on either supply during measurement acquisition. Use Value: 100ms min reset pulse width satisfies µP requirements; open-drain RST supports flexible voltage translation. |
Use Scenario: Edge gateway with ARM SoC (VDD_ARM = 4.38V), memory (VDD_IO = 2.93V), and real-time clock backup. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring coordinated reset across domains; WDI tied to SoC heartbeat signal. Use Value: Eliminates risk of partial initialization; watchdog timeout values align with SoC bootloader and kernel timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6359MSUT | Same thresholds (4.38V/2.93V) but push-pull RST referenced to VCC1 instead of open-drain | Eliminates need for external pull-up resistor; not suitable where level-shifting or wired-OR reset buses are required | Select MAX6359MSUT if board layout lacks space for pull-up or if driving CMOS inputs directly |
| TPS3808G33DBVR | Single-supply (3.3V threshold only), no watchdog, 350nA IQ, SOT23-6 | Lacks dual-rail monitoring and watchdog functionality; suited only for simpler single-rail systems | Choose TPS3808G33DBVR only when supervising one rail and ultra-low IQ is mandatory |
Compared with MAX6358MSUT, MAX6359MSUT offers simplified drive capability but reduced interface flexibility, while TPS3808G33DBVR trades dual-supply supervision and watchdog for extreme low-power operation - neither is pin-compatible, and both require PCB redesign for substitution.
Availability
MAX6358MSUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial controllers, intelligent instruments, and multivoltage embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6358MSUT 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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing applications.
The MAX6351–MAX6360 family delivers dual- and triple-voltage supervision with integrated watchdog timers, targeting reliability-critical embedded systems where power integrity and processor health monitoring are essential.
FAQ
What is the function of the WDI pin on the MAX6358MSUT?
The WDI (Watchdog Input) pin on the MAX6358MSUT monitors processor activity via edge transitions. If no rising or falling edge occurs within 2.9s (normal mode) or 46.4s (startup mode), it triggers a reset. During power-up, the MAX6358MSUT enters startup mode automatically, allowing time for firmware initialization before enforcing the shorter timeout. This behavior is intrinsic to the MAX6358MSUT design and does not require external configuration.
Does the MAX6358MSUT support operation with VCC1 and VCC2 below 1.2V?
The MAX6358MSUT guarantees functional operation only when VCC1 and VCC2 are ≥1.2V across the full temperature range (-40°C to +85°C). However, its RESET output remains valid and asserted as long as either VCC1 ≥1.0V or VCC2 ≥1.0V - a key feature enabling controlled shutdown during brownout conditions. Below 1.0V, the MAX6358MSUT ceases operation and RESET becomes undefined.
How does the MAX6358MSUT differ from the MAX6358LTUT in terms of voltage thresholds?
The MAX6358MSUT has VCC1 = 4.38V and VCC2 = 2.93V thresholds, whereas the MAX6358LTUT specifies VCC1 = 4.63V and VCC2 = 3.08V. These differences reflect distinct factory-trimmed threshold combinations intended for different supply rail pairings - e.g., MAX6358MSUT suits +4.5V/+3.0V systems, while MAX6358LTUT targets +4.75V/+3.3V rails. Both share identical watchdog timing, package, and pinout.
Can the MAX6358MSUT be used to monitor three voltage rails?
No - the MAX6358MSUT monitors exactly two supply rails (VCC1 and VCC2) and does not include the RSTIN input found on MAX6355/MAX6356/MAX6357 variants. For triple-voltage supervision, select MAX6356MSUT (same thresholds, adds RSTIN for third-rail monitoring at 1.22V reference). The MAX6358MSUT's architecture is strictly dual-rail; adding a third rail requires external circuitry or a different part number.
Is the MAX6358MSUT pin-compatible with other devices in the MAX6351–MAX6360 family?
Yes - all 6-pin SOT23 variants in the MAX6351–MAX6360 family, including MAX6358MSUT, share identical pinouts: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = WDI (or RSTIN/RST2 depending on variant), Pin 6 = VCC1. However, function differs per part: MAX6358MSUT uses Pin 5 as WDI, while MAX6355MSUT uses it as RSTIN and MAX6351MSUT as RST2. Thus, direct substitution requires verifying functional alignment, not just pin count.
MAX6358MSUT 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:
- 2
- Voltage - Threshold:
- 2.93V, 4.38V
- 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
MAX6358MSUT FAQ
1.How can I place an order for MAX6358MSUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6358MSUT 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 MAX6358MSUT reliable?
The price and inventory of MAX6358MSUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6358MSUT is usually 5 days.
3.What payment methods are accepted for MAX6358MSUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6358MSUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6358MSUT?
MAX6358MSUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6358MSUT 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 MAX6358MSUT?
For technical support, including MAX6358MSUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6358MSUT requirements.
6.How does Aetrix verify that MAX6358MSUT is sourced from the original manufacturer or authorized distributors?
All MAX6358MSUT 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 MAX6358MSUT meets industry standards.
7.What is the process for return or replacement of MAX6358MSUT?
All MAX6358MSUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6358MSUT, 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 MAX6358MSUT part is unused and in its original packaging.
Return procedure for MAX6358MSUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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