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Analog Devices Inc./Maxim Integrated MAX6831TZUT+T
- Part No.:
- MAX6831TZUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831TZUT+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,308
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Product details
Overview
MAX6831TZUT+T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, factory-trimmed VCC2 monitor (2.313V threshold), manual reset input, and 1.6s watchdog timer. It monitors primary supply VCC (3.08V threshold) and secondary supply VCC2 down to +0.9V, asserts reset during brownout or power-up, and guarantees valid reset operation down to VCC = +1.0V. It is used in portable battery-powered equipment requiring reliable µP reset under multivoltage rail conditions.
For engineers reviewing the MAX6831TZUT+T datasheet, MAX6831TZUT+T pinout, MAX6831TZUT+T application, or MAX6831TZUT+T equivalent, this page delivers verified specifications including dual-threshold monitoring (VCC = 3.08V, VCC2 = 2.313V), 140ms min reset timeout, open-drain RESET output, -40°C to +125°C operation, and SOT23-6 package compatibility - all confirmed from Maxim's official datasheet Rev 3 (7/14).
Technical Context
The MAX6831TZUT+T implements a dual-comparator architecture: one for factory-trimmed VCC2 monitoring at 2.313V (±0.069V over -40°C to +125°C), and another for primary VCC monitoring at 3.08V (±0.07V). Its internal 1.6s watchdog timer clears on any WDI edge and triggers reset if no transition occurs within timeout.
It features an open-drain RESET output with ≤0.3V VOL at 50µA sink, guaranteed operation down to VCC = +1.0V, and immunity to negative VCC transients ≤20µs at 100mV overdrive. The MR input includes a 50kΩ internal pullup and supports CMOS-level or open-drain driving without external debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V ±0.07V (min/max over -40°C to +125°C); sets primary supply brownout detection point |
| VCC2 Reset Threshold | 2.313V ±0.069V (min/max over -40°C to +125°C); factory-trimmed secondary supply monitor |
| Reset Timeout Period | 140ms minimum; ensures µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout Period | 1.6s nominal (0.8s–2.6s over temperature); detects µP lockup by missing WDI transitions |
| RESET Output Type | Active-low open-drain; enables bidirectional µP reset I/O interfacing (e.g., Motorola 68HC11) with single pullup |
| Operating Voltage Range | +1.2V to +5.5V (VCC); supports low-voltage systems while maintaining reset validity down to +1.0V |
| Supply Current (ICC) | 30µA max at -40°C to +125°C, VCC = +3.6V; enables ultra-low-power battery operation |
Pinout & Package
MAX6831TZUT+T is housed in a RoHS-compliant 6-pin SOT23 package (package code U6+1, outline 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad optional. Pin 1 is marked via dot or bevel; device orientation follows JEDEC MO-178.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks current when asserted; requires external pullup for logic-high state |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O; must be low-impedance connection |
| 3 | MR | Manual-reset input (active-low); internally pulled up to VCC with 50kΩ; resets µP when pulled to GND |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets internal 1.6s timer on each transition; disabled if floating |
| 5 | VCC2 | Secondary supply input; factory-trimmed comparator input for 2.313V threshold monitoring |
| 6 | VCC | Primary supply input; feeds comparator for 3.08V threshold detection and powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (3.08V) and VCC2 (2.313V) with separate comparators - eliminates need for discrete resistive dividers on secondary rail |
| Open-drain RESET with guaranteed low-VCC operation | Valid reset assertion down to VCC = +1.0V and VOL ≤ 0.3V at 50µA sink - ensures robust reset signaling even during deep brownout |
| Immunity to short VCC transients | No false reset for negative VCC glitches ≤20µs wide at 100mV overdrive - avoids spurious resets in noisy power environments |
| No external components required | Factory-trimmed thresholds, internal MR pullup, and self-contained watchdog eliminate capacitors, resistors, or trimming - reduces BOM count and layout area |
| Wide industrial temperature range | Specified from -40°C to +125°C with full parameter validation - suitable for automotive under-hood, industrial control, and harsh-environment embedded systems |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Handheld medical monitors powered by single-cell Li-ion (3.0–4.2V) with 2.5V I/O rail and 1.8V core supply. IC Role / Device Role / Timing Role: MAX6831TZUT+T monitors main battery (VCC = 3.08V trip) and 2.5V I/O rail (VCC2 = 2.313V trip), asserts open-drain RESET to hold µP until both rails stabilize post-power-on. Use Value: Prevents firmware execution during partial power-up; 140ms timeout ensures ADC and sensor bias circuits reach steady state before µP release. |
Use Scenario: Programmable logic controller (PLC) CPU module with dual 3.3V and 2.5V supplies powering FPGA and communication PHY. IC Role / Device Role / Timing Role: MAX6831TZUT+T supervises 3.3V VCC (3.08V threshold) and 2.5V auxiliary rail (VCC2 = 2.313V), while WDI watches FPGA configuration state machine. Use Value: Detects simultaneous rail collapse or FPGA hang; open-drain RESET interfaces directly to FPGA's bidirectional INIT_B pin without level-shifting. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable gas analyzer using ARM Cortex-M4 with 1.2V core, 3.3V analog front-end, and isolated 5V sensor excitation. IC Role / Device Role / Timing Role: MAX6831TZUT+T monitors 3.3V AFE supply (VCC) and isolated 5V rail (via resistor divider into VCC2) to detect sensor power failure. Use Value: Factory-trimmed VCC2 threshold eliminates calibration drift vs. resistor-based solutions; 1.6s watchdog catches firmware stalls during real-time spectral processing. |
Use Scenario: Railway signaling controller where µP must never execute corrupted code due to undervoltage or EMI-induced latchup. IC Role / Device Role / Timing Role: MAX6831TZUT+T provides fail-safe reset with dual-rail monitoring (VCC = 3.08V, VCC2 = 2.313V), MR for maintenance reset, and WDI fed by watchdog timer ISR. Use Value: Guaranteed reset validity down to VCC = +1.0V prevents metastability; immunity to 20µs VCC glitches avoids nuisance resets in electrically noisy traction environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830TZUT+T | Push-pull active-high RESET output (not open-drain); same VCC/VCC2 thresholds and watchdog | Requires level translation or µP with active-high reset input; incompatible with bidirectional reset pins | Select when system µP reset pin is active-high and no shared bus contention exists |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 monitor; fixed 3.08V threshold; push-pull RESET | Lacks secondary rail monitoring; cannot replace dual-threshold function without adding external circuitry | Use only if secondary supply supervision is handled separately or not required |
Compared with MAX6831TZUT+T, MAX6830TZUT+T offers identical dual-monitoring capability but differs in RESET polarity and drive type - limiting interoperability with bidirectional µP reset I/O. TPS3808G33DBVR omits VCC2 monitoring entirely, requiring redesign to support multivoltage systems.
Availability
MAX6831TZUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX6831TZUT+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) designs precision analog, mixed-signal, and high-reliability ICs for industrial, automotive, communications, and computing markets.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-rail µP supervision in space-constrained, battery-sensitive systems - delivering factory-trimmed accuracy, integrated watchdog, and guaranteed operation down to 1.0V VCC.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831TZUT+T?
The MAX6831TZUT+T has a factory-trimmed VCC2 reset threshold of 2.313V, with a tolerance of ±0.069V over the full operating temperature range (-40°C to +125°C). This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold" for suffix Z, and applies exclusively to MAX6829/MAX6830/MAX6831 variants - not to the adjustable RESET IN input found in MAX6826–MAX6828.
Does MAX6831TZUT+T support manual reset functionality, and how is it implemented?
Yes, MAX6831TZUT+T supports manual reset via the MR pin (Pin 3), which is active-low and features an internal 50kΩ pullup resistor to VCC. Pulling MR to GND forces a reset for the duration of the low signal plus the full 140ms minimum timeout period. The MR input accepts standard CMOS logic levels and requires no external debounce components - a simple momentary switch to GND suffices for field service reset.
What is the watchdog timeout period of MAX6831TZUT+T, and how is it cleared?
The MAX6831TZUT+T features a nominal 1.6s watchdog timeout period (ranging from 0.8s to 2.6s over temperature). The internal timer is cleared on any rising or falling edge at the WDI pin (Pin 4). If WDI remains static beyond timeout, a reset is asserted for 140ms. The timer is also automatically cleared whenever RESET is asserted or MR is pulled low - ensuring coordinated reset behavior across all fault conditions.
Can MAX6831TZUT+T monitor a secondary supply below 0.9V?
No, MAX6831TZUT+T cannot monitor a secondary supply below 0.9V. Its VCC2 input is factory-trimmed for thresholds ranging from 0.9V to 2.5V depending on suffix; the Z suffix (as in MAX6831TZUT+T) corresponds to 2.313V. For sub-0.9V monitoring, the MAX6826/MAX6827/MAX6828 series provide an adjustable RESET IN input with 0.63V typical threshold - but those parts lack the dedicated VCC2 pin and use resistor-divider networks instead.
Is MAX6831TZUT+T compatible with bidirectional microcontroller reset pins?
Yes, MAX6831TZUT+T is explicitly designed for bidirectional µP reset I/O compatibility via its open-drain RESET output (Pin 1). When connected directly to a bidirectional reset pin (e.g., Motorola 68HC11), a single external pullup resistor enables the µP to drive the line low during its own reset sequence while allowing MAX6831TZUT+T to assert reset unidirectionally - eliminating level shifters or additional logic.
MAX6831TZUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.313V, 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6831TZUT+T FAQ
1.How can I place an order for MAX6831TZUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831TZUT+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 MAX6831TZUT+T reliable?
The price and inventory of MAX6831TZUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831TZUT+T is usually 5 days.
3.What payment methods are accepted for MAX6831TZUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831TZUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831TZUT+T?
MAX6831TZUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831TZUT+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 MAX6831TZUT+T?
For technical support, including MAX6831TZUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831TZUT+T requirements.
6.How does Aetrix verify that MAX6831TZUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6831TZUT+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 MAX6831TZUT+T meets industry standards.
7.What is the process for return or replacement of MAX6831TZUT+T?
All MAX6831TZUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831TZUT+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 MAX6831TZUT+T part is unused and in its original packaging.
Return procedure for MAX6831TZUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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