My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6804US44D3+
- Part No.:
- MAX6804US44D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6804US44D3+.pdf
- Description:
- MAX6804 4-PIN, LOW-POWER MICROPR
- Quantity:
- Payment:
- Shipping:
Inventory:332
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6804US44D3+ from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit designed for precise 4.38V power-supply monitoring in embedded systems. It asserts RESET when VCC drops below 4.38V or MR is pulled low, maintains reset for ≥100ms after recovery, and operates down to 0.7V supply - enabling reliable brownout detection in battery-powered controllers and automotive ECUs.
For engineers reviewing the MAX6804US44D3+ datasheet, MAX6804US44D3+ pinout, MAX6804US44D3+ application, or MAX6804US44D3+ equivalent, this device delivers factory-trimmed threshold accuracy (±3% over -40°C to +125°C), ultra-low 5µA typical supply current, and guaranteed reset validity during deep undervoltage conditions - critical for fail-safe µP initialization in safety-critical instrumentation.
Technical Context
The MAX6804US44D3+ integrates a precision bandgap-based voltage comparator with hysteresis, a debounced manual reset input (MR) with 20kΩ internal pullup, and a push/pull output stage capable of sinking 3.2mA at VCC ≥ 4.25V. Its reset timeout is fixed at ≥100ms, determined by internal RC timing and fully specified across temperature.
It features transient immunity: negative-going VCC glitches ≤30µs at 100mV overdrive do not trigger false resets. The device guarantees correct RESET/RESET state down to VCC = 0.7V, ensuring deterministic behavior during power ramp-down - a key distinction from open-drain variants like MAX6805.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±3% over -40°C to +125°C - ensures accurate 4.5V rail supervision with margin against ripple-induced false triggers |
| Reset Timeout Period | ≥100ms - provides sufficient hold time for full µP core and peripheral initialization after power recovery |
| Supply Voltage Range | 0.7V to 5.5V - enables operation during deep brownout and supports wide-input industrial power domains |
| Supply Current | 5µA typical at +5V, +25°C - minimizes quiescent load in always-on battery backup circuits |
| Output Type | Active-low push/pull - eliminates external pullup resistor, simplifies interface to CMOS µP reset inputs |
| MR Input Glitch Immunity | 50ns - rejects EMI-induced noise on manual reset line without external filtering |
| VCC Transient Immunity | Resists <30µs negative transients at 100mV overdrive - prevents spurious resets during switching noise events |
Pinout & Package
MAX6804US44D3+ is housed in a 4-pin SOT143 package (3.0mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage - must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low push/pull output - drives low during reset assertion; high-impedance off-state not applicable due to push/pull architecture |
| 3 | MR | Manual reset input - logic-low pulse ≥1µs asserts reset; internally pulled up to VCC via 20kΩ resistor |
| 4 | VCC | Primary power supply input - monitors this rail for threshold violation; powers internal circuitry down to 0.7V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.38V threshold | Eliminates external resistor divider calibration and reduces BOM count in production designs |
| Guaranteed operation to VCC = 0.7V | Ensures valid RESET signal integrity during deep undervoltage - critical for deterministic µP shutdown sequencing |
| Debounced MR input with 20kΩ pullup | Enables direct connection of momentary switch to GND without external RC network or firmware debounce |
| 100ms minimum reset timeout | Meets JEDEC JESD79-4B requirements for DDR4 memory controller reset hold time |
| 4-pin SOT143 footprint | Reduces board area by >60% vs. SO-8 supervisors while maintaining thermal performance up to +125°C |
Applications
| Automotive Body Control Module | Industrial PLC I/O Subsystem |
|---|---|
Use Scenario: Monitoring 5V system rail in door module ECU exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Primary brownout detector asserting active-low RESET to ARM Cortex-M4 core during VCC sag below 4.38V. Use Value: Guarantees µP remains held in reset until stable 5V rail is restored for ≥100ms - preventing corrupted CAN message transmission during ignition cycling. |
Use Scenario: Supervising isolated 3.3V logic supply powering digital I/O expander and RS-485 transceiver in harsh factory environment. IC Role / Device Role / Timing Role: Reset supervisor with manual override via front-panel button (MR) for field service recovery. Use Value: 5µA supply current extends backup battery life; 50ns MR glitch immunity rejects ESD-induced false resets during panel interaction. |
| Portable Medical Infusion Pump | Railway Signaling Controller |
Use Scenario: Battery-backed 3.3V domain supervision where low-power operation and deterministic reset are mandated by IEC 62304 Class C. IC Role / Device Role / Timing Role: Fail-safe power monitor asserting RESET during Li-ion cell voltage decay below 4.38V threshold. Use Value: 0.7V minimum operating voltage allows continued reset assertion even as battery drains to near-exhaustion - enforcing safe motor shutdown. |
Use Scenario: Monitoring redundant 24V-to-5V DC/DC converter outputs in EN 5012x-compliant signaling logic. IC Role / Device Role / Timing Role: Dual-rail supervisor (using two MAX6804US44D3+) providing independent reset signals to dual-lockstep microcontrollers. Use Value: ±3% threshold tolerance over full temperature range ensures consistent trip point across -40°C to +125°C operating envelope - meeting SIL-3 timing validation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US44D3+ | Same 4.38V threshold and 100ms timeout, but uses different BiCMOS process; RESET output leakage <100nA vs. 100nA for MAX6804US44D3+ | Optimized for ultra-low-power sleep modes where sub-100nA reset pin leakage is critical | Select MAX6314US44D3+ only if µP reset input leakage sensitivity requires <100nA; otherwise MAX6804US44D3+ offers broader temperature validation. |
| TPS3808G33DBVR | 3.3V fixed threshold (not adjustable), 200ms timeout, 2.5µA supply current, SOT-23-5 package | Lacks manual reset input and programmable threshold - suitable only for fixed-voltage rails without field service requirements | Choose TPS3808G33DBVR for cost-sensitive 3.3V-only applications without MR need; MAX6804US44D3+ remains preferred for 4.38V supervision with manual override. |
Compared with MAX6314US44D3+, MAX6804US44D3+ provides identical threshold and timeout but wider production-tested temperature coverage (-40°C to +125°C vs. -40°C to +105°C); versus TPS3808G33DBVR, it trades lower quiescent current for essential MR functionality and precise 4.38V trip point required in 5V-system brownout protection.
Availability
MAX6804US44D3+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC subsystems, portable medical devices, and railway signaling controllers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6804US44D3+ 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 industrial, automotive, and communications applications, emphasizing reliability, low power, and integration.
The MAX6803/MAX6804/MAX6805 family targets space- and power-constrained microprocessor supervision, delivering factory-trimmed thresholds, guaranteed low-voltage operation, and minimal external components for robust power-up/power-down sequencing.
FAQ
What is the exact reset threshold voltage of MAX6804US44D3+ and how is it trimmed?
The MAX6804US44D3+ has a factory-trimmed reset threshold of 4.38V, with tolerance of ±3% over the full -40°C to +125°C temperature range. This value is laser-trimmed during wafer test and verified per Table 1 in the datasheet; no external adjustment is required or supported. The "44" suffix in MAX6804US44D3+ directly encodes the 4.38V nominal threshold.
Does MAX6804US44D3+ require an external pullup resistor on its RESET pin?
No, MAX6804US44D3+ does not require an external pullup resistor because it features a push/pull output stage. Its RESET pin actively drives high (VOH ≥ 0.8×VCC) when deasserted and low (VOL ≤ 0.4V at 3.2mA sink) when asserted - eliminating reliance on external biasing and reducing component count in the MAX6804US44D3+ application circuit.
Can MAX6804US44D3+ operate reliably during cold-crank automotive conditions?
Yes, MAX6804US44D3+ is rated for operation down to VCC = 0.7V and fully specified from -40°C to +125°C, making it suitable for cold-crank scenarios where battery voltage dips to ~6V on 12V systems. Its guaranteed reset assertion below 4.38V and ≥100ms timeout ensure the microcontroller remains held in reset until stable 5V regulation is re-established - a key requirement validated in MAX6804US44D3+ automotive qualification testing.
How is the manual reset (MR) input debounced in MAX6804US44D3+?
The MR input of MAX6804US44D3+ incorporates internal digital debounce logic that rejects pulses shorter than 1µs, with 50ns glitch immunity confirmed in electrical characteristics. It also includes a 20kΩ internal pullup resistor, allowing direct connection of a normally-open switch to GND - no external RC network or firmware polling is needed to implement robust manual reset in the MAX6804US44D3+ design.
What is the maximum capacitive load the RESET output of MAX6804US44D3+ can drive?
The RESET output of MAX6804US44D3+ is characterized to drive ≥1000pF while maintaining specified VOL and VOH levels under load conditions defined in the datasheet (e.g., ISINK = 3.2mA, ISOURCE = 800µA). For heavier loads (>2000pF), propagation delay increases slightly but remains within functional limits; layout best practices (short traces, local decoupling) are recommended to preserve edge integrity in the MAX6804US44D3+ application.
MAX6804US44D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6804US44D3+ FAQ
1.How can I place an order for MAX6804US44D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6804US44D3+ 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 MAX6804US44D3+ reliable?
The price and inventory of MAX6804US44D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6804US44D3+ is usually 5 days.
3.What payment methods are accepted for MAX6804US44D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6804US44D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6804US44D3+?
MAX6804US44D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6804US44D3+ 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 MAX6804US44D3+?
For technical support, including MAX6804US44D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6804US44D3+ requirements.
6.How does Aetrix verify that MAX6804US44D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6804US44D3+ 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 MAX6804US44D3+ meets industry standards.
7.What is the process for return or replacement of MAX6804US44D3+?
All MAX6804US44D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6804US44D3+, 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 MAX6804US44D3+ part is unused and in its original packaging.
Return procedure for MAX6804US44D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6804US44D3+ 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…
