My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6721UTZGD3
- Part No.:
- MAX6721UTZGD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6721UTZGD3.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
The MAX6721UTZGD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V factory-trimmed threshold) and VCC2 (3.075V factory-trimmed threshold), with watchdog timer (35s startup / 1.12s normal timeout), manual-reset input, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in telecom power sequencing and industrial embedded controllers.
For engineers reviewing the MAX6721UTZGD3 datasheet, MAX6721UTZGD3 pinout, MAX6721UTZGD3 application, or MAX6721UTZGD3 equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), watchdog disable-by-open WDI, push-pull active-low RST output referenced to VCC1, and operation with ultra-low supply current (14µA typical at 3.6V).
Technical Context
This device implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds, a dedicated watchdog timer with dual-mode timing (long startup + short normal), and logic-controlled reset assertion via MR or RSTIN. All reset outputs are synchronized to internal timeout counters with hysteresis (0.5% VTH) and immunity to sub-20µs VCC transients.
The MAX6721UTZGD3 uses a single internal reference (626.5mV) for both VCC1/VCC2 comparators and the optional RSTIN input, enabling consistent threshold tracking across temperature (20ppm/°C tempco). Its push-pull RST output drives high to 0.8×VCC1 at 800µA, while reset deassertion occurs only after all monitored supplies exceed thresholds and timeout expires.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% over full temperature range) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% over full temperature range) |
| Reset Timeout | 210ms (minimum, fixed by D3 suffix) |
| Watchdog Timeout | 1.12s (normal mode), 35s (startup mode after reset) |
| Supply Current | 14µA typical at 3.6V, stable across -40°C to +125°C |
| Operating Range | -40°C to +125°C ambient, VCC1/VCC2 functional down to 0.8V |
| Output Type | Push-pull active-low RST referenced to VCC1 (VOH = 0.8×VCC1 @ 800µA) |
Pinout & Package
MAX6721UTZGD3 is housed in a RoHS-compliant 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), with gull-wing leads, moisture sensitivity level 1, and specified for surface-mount reflow per JEDEC J-STD-020.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 drop below thresholds, MR pulled low, or watchdog times out |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; reset remains active for full timeout after MR release |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and referenced for RST2 (not present on this variant) |
| 5 | VCC1 | Primary supply input powering core logic and referenced for RST output and MR pullup |
| 6 | WDI | Watchdog input; unconnected disables watchdog; detects rising/falling edges to reset internal timer |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate comparators and shared timeout logic |
| Dual-mode watchdog timer | 35s minimum startup window enables safe boot of complex firmware before entering 1.12s normal monitoring mode |
| Guaranteed reset validity | Functional reset assertion and deassertion guaranteed even when VCC1 or VCC2 drops to 0.8V |
| Low-power operation | 14µA typical ICC at 3.6V enables use in battery-backed or energy-constrained systems without compromising supervision reliability |
| Transient immunity | Immune to VCC glitches <20µs duration (at 100mV overdrive), reducing false resets in noisy power environments |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Sequencing dual-rail power supplies (5V primary, 3.3V secondary) in base station RF front-end modules during cold start and brownout recovery. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting reset until both rails stabilize above 4.625V and 3.075V, then holding reset for 210ms minimum before releasing µP. Use Value: Prevents premature µP execution during incomplete rail ramp-up, eliminating firmware lockup caused by marginal VCC2 during 5V-to-3.3V LDO settling. |
Use Scenario: Monitoring isolated 24V DC input and internal 3.3V logic supply in DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervising both rails with guaranteed operation down to 0.8V per rail and -40°C to +125°C rating, using MR for field-service-initiated reset. Use Value: Ensures deterministic system restart after voltage sags induced by motor contactor switching, with no reliance on external reset conditioning circuits. |
| Medical Diagnostic Imaging Subsystem | Automotive ADAS Camera ECU |
Use Scenario: Validating auxiliary 1.8V sensor interface supply and main 3.3V FPGA core supply in portable ultrasound beamformer modules. IC Role / Device Role / Timing Role: Using push-pull RST to drive FPGA PROG_B pin directly, with watchdog disabled (WDI open) and MR tied to service button. Use Value: Eliminates need for external level-shifter or pullup resistor, reducing BOM count while maintaining IEC 62304 Class C reset integrity requirements. |
Use Scenario: Monitoring 5V camera power rail and 1.2V image sensor core supply in automotive surround-view camera ECUs operating under engine cranking conditions. IC Role / Device Role / Timing Role: Asserting reset during VCC1 dip below 4.625V (e.g., 4.2V cranking sag) while maintaining valid reset state down to VCC1 = 0.8V. Use Value: Prevents corrupted image capture during transient undervoltage events without requiring backup capacitor sizing beyond standard 10µF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6720UTLTD3-T | No watchdog timer; identical VCC1/VCC2 thresholds (4.625V/3.075V), same 210ms timeout, push-pull RST | Suitable where µP-level activity monitoring is unnecessary; lower quiescent current (10µA typ) | Select when watchdog functionality is unused and lowest possible ICC is required |
| TPS3808G33DBVR | Single-supply monitor (3.3V threshold only); no VCC2 input; 200ms timeout; open-drain RST; requires external pullup | Lacks dual-rail capability; requires additional IC for VCC2 supervision; smaller footprint (SOT23-5) | Select only if system uses single regulated rail and board space is constrained more than supervision completeness |
Compared with MAX6720UTLTD3-T and TPS3808G33DBVR, the MAX6721UTZGD3 uniquely delivers integrated dual-supply monitoring plus watchdog capability in one 6-pin SOT23, avoiding multi-IC solutions while ensuring coordinated reset timing across rails and processor activity checks - critical for safety-critical embedded boot sequences.
Availability
MAX6721UTZGD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and medical imaging applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6721UTZGD3 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 demanding industrial, automotive, and communications applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, multi-rail supervision with integrated watchdog and manual reset - engineered specifically for reliable boot and runtime monitoring in space-constrained, high-reliability embedded systems.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6721UTZGD3?
The MAX6721UTZGD3 has factory-trimmed VCC1 reset threshold of 4.625V (±1.5%) and VCC2 reset threshold of 3.075V (±1.5%), as defined by the 'T' and 'S' suffixes in its ordering code. These values are guaranteed over the full -40°C to +125°C operating range and are not adjustable. The MAX6721UTZGD3 uses a single internal 626.5mV reference for both comparators, ensuring matched tracking.
Does the MAX6721UTZGD3 support triple-voltage monitoring?
No, the MAX6721UTZGD3 is a dual-voltage supervisor only - it monitors VCC1 and VCC2. It does not include the RSTIN input required for third-voltage monitoring. That function is available only on variants like MAX6723A–MAX6727A. The MAX6721UTZGD3 pinout omits RSTIN, and its internal circuitry lacks the associated comparator and input buffer.
How is the watchdog timer disabled on the MAX6721UTZGD3?
The watchdog timer on the MAX6721UTZGD3 is disabled by leaving the WDI pin unconnected. An internal 200nA current source detects the open state and disables watchdog functionality. Do not tie WDI to any node sourcing >50nA, as this may falsely enable the watchdog. When disabled, the MAX6721UTZGD3 operates solely as a dual-supply voltage supervisor with manual reset.
What is the reset timeout period for the MAX6721UTZGD3, and is it adjustable?
The MAX6721UTZGD3 has a fixed reset timeout period of 210ms (minimum), indicated by the 'D3' suffix in its part number. This value is factory-programmed and not adjustable via external components or pins. The timeout begins when all monitored supplies rise above their thresholds and continues uninterrupted unless reset is reasserted by a new fault condition.
Can the MAX6721UTZGD3 operate with VCC1 = 1.8V and VCC2 = 1.2V?
Yes, the MAX6721UTZGD3 supports VCC1 and VCC2 as low as 0.8V each, so operation at 1.8V and 1.2V is fully within specification. However, the 4.625V VCC1 threshold means that at 1.8V supply, the VCC1 comparator will always assert reset - confirming the device is intended for higher-voltage rails. For low-voltage systems, select a variant with appropriate threshold suffixes (e.g., 'W' for 1.665V).
MAX6721UTZGD3 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:
- 1.11V, 2.313V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6721UTZGD3 FAQ
1.How can I place an order for MAX6721UTZGD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6721UTZGD3 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 MAX6721UTZGD3 reliable?
The price and inventory of MAX6721UTZGD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6721UTZGD3 is usually 5 days.
3.What payment methods are accepted for MAX6721UTZGD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6721UTZGD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6721UTZGD3?
MAX6721UTZGD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6721UTZGD3 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 MAX6721UTZGD3?
For technical support, including MAX6721UTZGD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6721UTZGD3 requirements.
6.How does Aetrix verify that MAX6721UTZGD3 is sourced from the original manufacturer or authorized distributors?
All MAX6721UTZGD3 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 MAX6721UTZGD3 meets industry standards.
7.What is the process for return or replacement of MAX6721UTZGD3?
All MAX6721UTZGD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6721UTZGD3, 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 MAX6721UTZGD3 part is unused and in its original packaging.
Return procedure for MAX6721UTZGD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6721UTZGD3 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…
