My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6721UTVHD3-T
- Part No.:
- MAX6721UTVHD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721UTVHD3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6721UTVHD3-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (1.575V threshold) and VCC2 (0.788V threshold) with 210ms reset timeout, watchdog timer (35s startup / 1.12s normal), and open-drain active-low RST output. It ensures reliable system reset during brownout in telecom power supplies and battery-operated embedded controllers.
For engineers reviewing the MAX6721UTVHD3-T datasheet, MAX6721UTVHD3-T pinout, MAX6721UTVHD3-T application, or MAX6721UTVHD3-T equivalent, key selection criteria include dual-supply monitoring range (1.575V/0.788V), guaranteed reset validity down to VCC = 0.8V, 14µA supply current at 3.6V, and integrated watchdog with long-startup mode for boot-critical systems.
Technical Context
The MAX6721UTVHD3-T implements independent voltage comparators for VCC1 and VCC2, each referenced to factory-trimmed thresholds with 20ppm/°C tempco and 0.5% hysteresis. Its watchdog timer features dual-mode operation: 35s minimum initial timeout after any reset event, followed by 1.12s minimum normal timeout triggered by WDI edge transitions.
Reset assertion occurs when either supply falls below its threshold or MR is pulled low; reset remains asserted for 210ms (min) after all monitored voltages recover. The open-drain RST output requires external pullup and is guaranteed functional with VCC1 or VCC2 ≥ 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 1.575V (typ), factory-trimmed for precise 1.6V rail monitoring |
| VCC2 Threshold | 0.788V (typ), optimized for sub-1V core supply supervision |
| Reset Timeout | 210ms (min), ensures µP completes full initialization before release |
| Watchdog Period | 35s (min) startup + 1.12s (min) normal mode, supports complex boot sequences |
| Supply Current | 14µA (typ) at 3.6V, enables >10-year battery life in always-on monitoring |
| Operating Temp | -40°C to +85°C, qualified for industrial and telecom equipment environments |
| Reset Validity | Guaranteed down to VCC1 or VCC2 = 0.8V, prevents spurious resets during deep brownout |
Pinout & Package
SOT23-6 package with 1.6mm × 2.9mm footprint, 0.95mm height, and gull-wing leads compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts when VCC1/VCC2 drop below thresholds or MR is low |
| 2 | GND | Ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and referenced to 0.788V threshold |
| 5 | WDI | Watchdog input; rising/falling edges reset 1.12s timeout; 35s startup mode after reset |
| 6 | VCC1 | Primary supply input powering device core and referenced to 1.575V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of 1.6V I/O rail (VCC1) and 0.8V core rail (VCC2) without shared reference error |
| Long-startup watchdog timer | 35s minimum initial timeout allows full FPGA configuration and bootloader execution before watchdog enforcement begins |
| Immunity to short VCC transients | Rejects <20µs negative glitches at VCC, preventing false resets during switching noise |
| Low 14µA supply current | Enables integration into energy-harvesting nodes where quiescent power must stay below 50µW |
| Reset validity at 0.8V supply | Ensures deterministic reset behavior even during severe brownout conditions common in DC-DC converter faults |
Applications
| Telecom Power Management | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Monitoring primary 3.3V backplane supply and secondary 1.2V FPGA core supply in optical line terminal hardware. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting reset if either rail drops below spec during hot-swap events or load transients. Use Value: Prevents FPGA configuration corruption by holding reset until both rails stabilize for ≥210ms post-recovery. | Use Scenario: Supervising 1.8V MCU supply and 0.9V sensor analog front-end in wireless environmental monitor. IC Role / Device Role / Timing Role: Ensures clean boot after cold start from coin-cell battery; watchdog monitors firmware execution during sleep/wake cycles. Use Value: 14µA quiescent current extends 10-year battery life; 35s startup timeout accommodates slow battery voltage ramp-up. |
| Industrial PLC Controllers | Set-Top Box Power Sequencing |
Use Scenario: Validating 5V I/O bus and 2.5V processor core in programmable logic controller during factory power-up tests. IC Role / Device Role / Timing Role: Guarantees reset remains asserted until both supplies exceed thresholds and hold for 210ms, meeting IEC 61000-4-29 immunity requirements. Use Value: Eliminates need for discrete RC timing networks, reducing BOM count and layout area by 40%. | Use Scenario: Coordinating 12V main supply and 3.3V standby rail sequencing in digital TV receiver during wake-from-standby transition. IC Role / Device Role / Timing Role: Monitors both rails independently; asserts reset if standby rail collapses before main rail ramps, preventing partial initialization. Use Value: Open-drain RST output interfaces directly to multiple SoC reset pins without level-shifting, simplifying interconnect. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G15DBVR | Single-supply monitor (1.5V threshold only); no VCC2 input; fixed 200ms timeout | Lacks dual-rail capability; suitable only for single-rail systems requiring lower cost | Select when monitoring only one supply rail and budget constraints outweigh dual-monitoring need |
| ADM6705ARTZ-REEL7 | Triple-supply monitor with adjustable RSTIN; 140ms timeout; push-pull RST output | Supports third auxiliary voltage via resistor divider; higher drive strength but no watchdog | Choose when needing three-rail supervision and higher output current, accepting loss of watchdog functionality |
Compared with TPS3808G15DBVR and ADM6705ARTZ-REEL7, the MAX6721UTVHD3-T uniquely combines dual-rail monitoring, integrated watchdog with long-startup mode, and guaranteed 0.8V reset validity-making it optimal for complex boot-critical embedded systems requiring robust multi-supply supervision.
Availability
MAX6721UTVHD3-T is available at Aetrix Electronics and suitable for telecom infrastructure, battery-powered IoT sensors, and industrial PLC controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6721UTVHD3-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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6715–MAX6729 family delivers ultra-low-voltage dual/triple supervisory circuits targeting multivoltage embedded systems where simultaneous monitoring of I/O and core rails is essential for reliability.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6721UTVHD3-T?
The MAX6721UTVHD3-T has a factory-trimmed VCC1 reset threshold of 1.575V (typical), with min/max values of 1.530V and 1.620V across temperature and process variation. This value is encoded in the "VH" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6721UTVHD3-T variant.
Does the MAX6721UTVHD3-T support monitoring a third voltage rail?
No, the MAX6721UTVHD3-T is a dual-voltage supervisor and does not include the RSTIN input required for third-rail monitoring. That feature is present only in MAX6719/MAX6720/MAX6723–MAX6727 variants. The MAX6721UTVHD3-T monitors only VCC1 and VCC2.
What is the function of the WDI pin on the MAX6721UTVHD3-T?
The WDI (Watchdog Input) pin on the MAX6721UTVHD3-T monitors microprocessor activity: a rising or falling edge resets the 1.12s normal watchdog timeout, while absence of transitions for >35s (startup mode) or >1.12s (normal mode) triggers a system reset. This ensures firmware execution integrity in safety-critical applications.
Can the MAX6721UTVHD3-T operate with VCC1 = 1.2V?
No-the MAX6721UTVHD3-T requires VCC1 ≥ 1.530V to guarantee correct reset threshold operation, as its VCC1 threshold is 1.575V (typ). Operation below 1.530V violates the absolute minimum VCC1 specification and may result in undefined reset behavior or failure to assert reset during brownout.
What package type and pin count does the MAX6721UTVHD3-T use?
The MAX6721UTVHD3-T uses a 6-pin SOT23-6 package (1.6mm × 2.9mm body, 0.95mm height) with gull-wing leads. Pinout is standardized across the MAX6721 series: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = WDI, Pin 6 = VCC1.
MAX6721UTVHD3-T 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:
- 1.313V, 1.575V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6721UTVHD3-T FAQ
1.How can I place an order for MAX6721UTVHD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721UTVHD3-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 MAX6721UTVHD3-T reliable?
The price and inventory of MAX6721UTVHD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721UTVHD3-T is usually 5 days.
3.What payment methods are accepted for MAX6721UTVHD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721UTVHD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721UTVHD3-T?
MAX6721UTVHD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721UTVHD3-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 MAX6721UTVHD3-T?
For technical support, including MAX6721UTVHD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721UTVHD3-T requirements.
6.How does Aetrix verify that MAX6721UTVHD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6721UTVHD3-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 MAX6721UTVHD3-T meets industry standards.
7.What is the process for return or replacement of MAX6721UTVHD3-T?
All MAX6721UTVHD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721UTVHD3-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 MAX6721UTVHD3-T part is unused and in its original packaging.
Return procedure for MAX6721UTVHD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6721UTVHD3-T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
