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Analog Devices Inc./Maxim Integrated MAX807MEUE+
- Part No.:
- MAX807MEUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX807MEUE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,677
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Product details
Overview
The MAX807MEUE+ from Maxim Integrated is a full-featured microprocessor supervisory circuit designed for power monitoring, battery switchover, and watchdog protection in embedded µP systems. It provides ±1.5% reset threshold accuracy (4.425V), 200ms reset timeout, active-low and active-high RESET outputs, independent watchdog timer (1.6s timeout), and dual-mode power switching (250mA from VCC, 20mA from battery). It is used in portable instrumentation and industrial controllers requiring reliable brownout detection and CMOS RAM backup.
For engineers reviewing the MAX807MEUE+ datasheet, MAX807MEUE+ pinout, MAX807MEUE+ application, or MAX807MEUE+ equivalent, this page delivers verified functional roles, validated timing behavior, confirmed supply-current specs (70µA normal / 1µA standby), and real-world interface constraints - including CE gating propagation (2ns typ), BATT OK flag logic, and low-line comparator accuracy (±1.5% over 52mV offset).
Technical Context
The MAX807MEUE+ integrates six independent comparators (reset, low-line, power-fail, BATT OK, battery switchover, watchdog transition detector) with BiCMOS process technology to achieve ±1.5% reset threshold precision and 70µA typical supply current. Its internal state machine coordinates reset assertion, manual-reset latching, and watchdog timeout recovery without external components.
It implements dual-path power switching: VCC-to-OUT with 1.2Ω on-resistance (250mA), and BATT-to-OUT with 8.5Ω on-resistance (20mA), both guaranteed functional down to VCC = 1V. The chip-enable gate uses a series transmission gate with 75Ω on-resistance and 2ns propagation delay (50Ω source, 50pF load), enabling compatibility with high-speed µPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.425V ±1.5% - precise brownout detection for +5V systems with guaranteed validity down to VCC = 1V |
| Reset Timeout | 200ms - ensures µP completes power-up initialization before release from reset |
| Watchdog Timeout | 1.6s typical - detects µP lockup; cleared by WDI edge transition during non-reset state |
| VCC Supply Current | 70µA typical - enables long battery life in portable equipment |
| Battery Standby Current | 1µA - minimizes drain during extended backup-battery operation |
| CE Propagation Delay | 2ns typical - prevents spurious writes to CMOS RAM during power transients |
| Low-Line Threshold Offset | 52mV above reset threshold ±13mV hysteresis - enables early NMI for orderly shutdown |
Pinout & Package
MAX807MEUE+ is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch), RoHS-compliant and moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Noninverting input of uncommitted comparator; triggers PFO low when voltage falls below 2.265V |
| GND | Ground Reference | Common return for all analog and digital functions; bypass capacitor required at VCC and OUT |
| VCC | Main Supply Input | +4.35V to +5.5V nominal; powers internal circuitry and drives CE OUT and RESET in normal mode |
| BATT | Backup Battery Input | Accepts 2.0V–6V; enables automatic switchover to preserve CMOS RAM during main supply failure |
| OUT | Output Supply Voltage | Switched output connected to VCC (normal) or BATT (backup); requires 0.1µF bypass to GND |
| BATT ON | Battery-On Status Flag | CMOS output high when OUT is sourced from BATT; drives external PMOS/PNP switch for >250mA loads |
| MR | Manual Reset Input | Active-low input with internal 50–200µA pullup; asserts reset for ≥1µs pulse and holds 200ms after release |
| LOW LINE | Low-Line Comparator Output | Active-low NMI signal asserted when VCC falls to 52mV above reset threshold |
| RESET | Active-Low Reset Output | Strong-pull-down/weak-pullup CMOS output; valid down to VCC = 1V; wire-OR capable |
| RESET | Active-High Reset Output | Full-drive CMOS output (source/sink); inverse of RESET; not wire-OR compatible |
| WDO | Watchdog Fault Output | Active-low output asserted if WDI remains static >1.6s; high during reset or if WDI is open |
| WDI | Watchdog Input | Edge-triggered input; internal voltage divider pulls to ~1.8V if left floating, disabling watchdog |
| CE IN | Chip-Enable Input | High-impedance during reset; 75Ω series resistance in enabled mode; accepts TTL/CMOS levels |
| CE OUT | Chip-Enable Output | Pass-through gated signal; pulled to higher of VCC/VBATT when disabled to prevent RAM corruption |
| BATT OK | Battery-OK Status Flag | Active-high CMOS output indicating VBATT > 2.265V; valid only when VCC ≥ 4V |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% reset threshold accuracy | Enables robust operation across wide temperature (-55°C to +125°C) and supply-voltage ranges without calibration |
| Two-stage power-fail warning | Separate low-line comparator (52mV above reset threshold) provides deterministic NMI timing for software shutdown |
| Integrated CE gating with 2ns delay | Prevents invalid memory writes during power transients by disabling CE path within 28µs of reset assertion |
| MaxCap®/SuperCap® compatibility | Supports high-capacitance backup capacitors without oscillation or instability in battery-switchover mode |
| Guaranteed RESET validity to VCC = 1V | Ensures fail-safe reset assertion even during deep brownout conditions in battery-backed systems |
| Independent watchdog with 1.6s timeout | Detects µP firmware hangs without relying on reset line; fault output (WDO) can be diode-OR'd to MR |
Applications
| Portable Medical Instrumentation | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Handheld blood glucose meters and portable ECG monitors operating from single-cell Li-ion batteries with strict low-power requirements. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, RAM backup switchover, and watchdog supervision during battery discharge cycles. Use Value: 1µA standby current extends battery life; 4.425V reset threshold aligns with Li-ion cutoff voltage; 200ms timeout ensures safe MCU boot after wake-up. |
Use Scenario: DIN-rail mounted programmable logic controller modules exposed to 24VDC industrial power with voltage ripple and transient events. IC Role / Device Role / Timing Role: Power integrity monitor asserting reset on undervoltage, generating NMI via LOW LINE for controlled I/O shutdown, and protecting EEPROM writes. Use Value: ±1.5% reset accuracy prevents nuisance resets under 24V supply variation; CE gating blocks spurious writes during line dips. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: ANSI C12.20-certified electricity meters using supercapacitor backup during AC mains loss. IC Role / Device Role / Timing Role: Dual-supply supervisor managing switchover from 3.3V rail to supercapacitor, monitoring backup health (BATT OK), and guarding against firmware faults. Use Value: MaxCap® compatibility ensures stable switchover with 1F supercaps; BATT OK flag validates backup readiness before mains loss. |
Use Scenario: 12V automotive BCMs requiring ASIL-B–level power monitoring for microcontroller safety compliance. IC Role / Device Role / Timing Role: Redundant reset source with independent watchdog, low-line warning for battery voltage sag, and write-protection for configuration EEPROM. Use Value: -40°C to +125°C operation meets AEC-Q100 Grade 1; 52mV low-line hysteresis avoids false NMIs during cranking transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUS+T | Single active-low reset output only; no watchdog, no CE gating, no battery switchover; 2.93V reset threshold | Suitable for basic reset-only applications; lacks low-line warning, BATT OK, and RAM backup features | Select when only simple reset supervision is needed and cost is critical; not suitable for battery-backup or watchdog-reliant designs |
| TPS3808G33DBVR | Adjustable reset threshold (via external resistor); 3.3V fixed option; no battery switchover or CE gating; 200ms timeout | Targets 3.3V µP systems; requires external components for threshold setting; no backup power management | Choose for 3.3V domains where adjustable threshold is preferred; omit if battery switchover or integrated CE control is required |
Compared with MAX807MEUE+, MAX809SEUS+T offers lower cost and smaller footprint but sacrifices all advanced features (watchdog, low-line warning, battery control), while TPS3808G33DBVR supports 3.3V systems and adjustability but lacks the integrated power-path management essential for RAM backup integrity.
Availability
MAX807MEUE+ is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC I/O modules, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX807MEUE+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX807MEUE+ belongs to Maxim's µP supervisory product line, engineered for systems demanding simultaneous power monitoring, battery backup, and watchdog reliability - especially in portable, battery-critical, and safety-aware embedded environments.
FAQ
What is the reset threshold voltage of the MAX807MEUE+ and how accurate is it?
The MAX807MEUE+ has a nominal reset threshold of 4.425V with ±1.5% accuracy over temperature and supply voltage. This specification is guaranteed across the full operating range (-55°C to +125°C) and ensures reliable brownout detection without external calibration. The MAX807MEUE+ maintains valid RESET assertion down to VCC = 1V, making it suitable for deep brownout scenarios in battery-powered systems.
Does the MAX807MEUE+ support battery backup for CMOS RAM, and what are its current capabilities?
Yes, the MAX807MEUE+ provides automatic switchover from VCC to BATT input when main supply drops below the reset threshold. In battery-backup mode, it delivers up to 20mA at OUT with 8.5Ω typical on-resistance, and guarantees BATT OK status flag assertion when VBATT exceeds 2.265V. The MAX807MEUE+ draws only 1µA in battery-standby mode, preserving backup energy for extended periods.
How does the watchdog function work on the MAX807MEUE+, and what is its timeout period?
The MAX807MEUE+ watchdog monitors the WDI input for transitions; if no edge occurs within 1.6s (typical), WDO goes low to signal a fault. The timer clears automatically during reset assertion or upon any WDI edge while RESET is high. To trigger system reset on watchdog fault, connect WDO to MR via a diode. The MAX807MEUE+ watchdog operates independently of the reset circuit and remains functional even when VCC is near the reset threshold.
Can the MAX807MEUE+ be used to protect memory writes during power failure, and how?
Yes, the MAX807MEUE+ includes dedicated chip-enable (CE) gating: CE IN passes through to CE OUT during normal operation, but disables the path and pulls CE OUT high (to VCC or VBATT) during reset. With a 2ns typical propagation delay and 28µs disable latency, this prevents spurious writes to CMOS RAM or EEPROM during power transients. The MAX807MEUE+ also provides write-protection logic via its RESET outputs and manual reset input.
What is the purpose of the LOW LINE output on the MAX807MEUE+, and how is its threshold set?
The LOW LINE output on the MAX807MEUE+ provides an early power-fail warning by asserting low when VCC falls to 52mV above the reset threshold (i.e., 4.477V for MAX807MEUE+), with ±13mV hysteresis. It is intended to generate a non-maskable interrupt (NMI) for initiating software-controlled shutdown before reset occurs. Its threshold is fixed and factory-trimmed - no external components are required to configure the MAX807MEUE+ LOW LINE function.
MAX807MEUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.575V
- Output:
- -
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
MAX807MEUE+ FAQ
1.How can I place an order for MAX807MEUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807MEUE+ 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 MAX807MEUE+ reliable?
The price and inventory of MAX807MEUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807MEUE+ is usually 5 days.
3.What payment methods are accepted for MAX807MEUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807MEUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807MEUE+?
MAX807MEUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807MEUE+ 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 MAX807MEUE+?
For technical support, including MAX807MEUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807MEUE+ requirements.
6.How does Aetrix verify that MAX807MEUE+ is sourced from the original manufacturer or authorized distributors?
All MAX807MEUE+ 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 MAX807MEUE+ meets industry standards.
7.What is the process for return or replacement of MAX807MEUE+?
All MAX807MEUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX807MEUE+, 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 MAX807MEUE+ part is unused and in its original packaging.
Return procedure for MAX807MEUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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