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Analog Devices Inc./Maxim Integrated MAX800MCUE+
- Part No.:
- MAX800MCUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX800MCUE+.pdf
- Description:
- IC SUPERVISOR MPU 16-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,237
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Product details
Overview
The MAX800MCUE+ from Maxim Integrated is a microprocessor supervisory circuit designed for critical 5V power monitoring and system reset control in embedded controllers and intelligent instruments. It features a 4.4V typical reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and guaranteed RESET assertion down to VCC = 1V - enabling reliable brownout protection in battery-backed systems.
For engineers reviewing the MAX800MCUE+ datasheet, MAX800MCUE+ pinout, MAX800MCUE+ application, or MAX800MCUE+ equivalent, this device delivers verified power-fail accuracy (±2%), chip-enable signal gating with ≤10ns propagation delay, and dual watchdog timeout modes - all in a 16-pin TSSOP package suitable for space-constrained industrial and computing designs.
Technical Context
The MAX800MCUE+ integrates a precision voltage monitor, dual-reset outputs (active-low RESET and active-high RESET), a programmable watchdog timer with internal/external timing options, and bidirectional chip-enable gating logic. Its battery switchover comparator activates when VCC falls below VBATT − 0.3V, enabling seamless transition to backup power while asserting reset.
It implements an open-drain RESET output with 0.1V saturation at 3.2mA sink, a TTL-compatible WDO output, and a dedicated PFI/PFO comparator for independent power-fail or low-battery warning - all operating independently of the main reset function without cross-coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.40V typical (guaranteed 4.25V–4.50V); ensures deterministic reset assertion during 5V rail brownout. |
| Reset Timeout Period | 200ms typical on power-up (140–280ms range); provides sufficient μP initialization time before release. |
| Supply Current (Operating) | 30μA typical (≤100μA max); enables low-power operation in always-on monitoring applications. |
| CE IN-to-CE OUT Propagation Delay | 6–10ns (50Ω source, 50pF load); supports high-speed memory interface gating without timing violation. |
| Power-Fail Accuracy | ±2% (MAX800M variant); enables precise early-warning detection for regulated 5V supplies. |
| RESET Output Validity | Down to VCC = 1V (open-drain, 0.1V @ 3.2mA sink); maintains reset integrity across deep undervoltage conditions. |
| Watchdog Timeout (Long) | 1.6s nominal (internal oscillator); provides robust software activity supervision for real-time control loops. |
Pinout & Package
MAX800MCUE+ is housed in a 16-pin TSSOP package (JEDEC MO-153, 4.4mm × 5.0mm body, 0.65mm pitch) with exposed pad for thermal enhancement and standard lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-backup input | Connects to backup capacitor or battery; enables VOUT sourcing when VCC < VBATT − 0.3V. |
| 2 VOUT | Output supply voltage | Primary system supply rail (VCC or VBATT sourced); requires 0.1µF decoupling to GND. |
| 3 VCC | Main 5V supply input | Regulated +5V input (4.5V–5.5V range); powers internal circuitry and drives VOUT via PMOS switch. |
| 4 GND | Ground reference | 0V return for all analog/digital functions; must be low-impedance connection. |
| 5 BATT ON | Battery-status indicator | Open-drain output high when VBATT is active; sinks 3.2mA @ 0.1V for LED or transistor drive. |
| 6 LOW LINE | Reset-threshold comparator output | Buffered active-low signal indicating VCC < 4.4V; used for system status indication. |
| 7 OSC IN | External timing input | Accepts external clock or timing capacitor (47pF typical) to configure watchdog/reset periods. |
| 8 OSC SEL | Oscillator mode select | Logic-high = internal oscillator (1.6s/200ms default); logic-low = external timing source. |
| 9 PFI | Power-fail comparator input | Non-inverting input referenced to 1.25V; ±25nA leakage enables high-impedance sensing. |
| 10 PFO | Power-fail comparator output | Active-low open-drain output; asserts when PFI < 1.25V - independent of reset logic. |
| 11 WDI | Watchdog input | Three-level input (high/low/floating); 100ns minimum pulse resets watchdog timer. |
| 12 CE OUT | Gated chip-enable output | Passes CE IN only when VCC > reset threshold; prevents RAM corruption during power failure. |
| 13 CE IN | Chip-enable input | High-impedance when reset asserted; 75Ω series resistance in enabled mode. |
| 14 WDO | Watchdog output | Active-low open-drain; asserts synchronously with RESET upon watchdog timeout. |
| 15 RESET | Active-low reset output | Open-drain, sinks 3.2mA @ 0.1V; guaranteed valid down to VCC = 1V. |
| 16 RESET | Active-high reset output | Open-drain inverse of RESET; high-impedance when not asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed ±2% power-fail accuracy | Enables precise early-warning detection for 5V supplies without external calibration. |
| Chip-enable gating with ≤10ns delay | Prevents erroneous writes to CMOS RAM during brownout without violating μP timing budgets. |
| VCC-to-VOUT on-resistance ≤1.4Ω | Minimizes voltage drop (≤350mV @ 250mA) for stable system rail delivery under full load. |
| Backup-battery switchover at VCC < VBATT − 0.3V | Ensures seamless transition to backup power with 60mV hysteresis to prevent chatter. |
| RESET validity down to VCC = 1V | Maintains deterministic reset state even during severe undervoltage, eliminating boot failures. |
| Configurable watchdog timeout (100ms/1.6s) | Supports both fast-response fault recovery and long-interval software supervision. |
Applications
| Industrial Controller Reset Management | Embedded Data Logger Power Monitoring |
|---|---|
Use Scenario: PLC I/O modules requiring fail-safe reset during AC line sags or DC supply ripple. IC Role / Device Role / Timing Role: Supervisory circuit providing 200ms reset hold-off and 4.4V threshold detection to prevent spurious reboots. Use Value: Eliminates firmware corruption by ensuring μP remains held in reset until 5V rail stabilizes post-sag. |
Use Scenario: Battery-powered environmental sensor node logging data to EEPROM during mains outage. IC Role / Device Role / Timing Role: Dual-role supervisor: triggers reset on brownout and enables battery switchover to preserve RAM contents. Use Value: Guarantees 25mA backup current delivery to VOUT with <10µA standby draw, extending battery life >6 months. |
| Medical Diagnostic Equipment Watchdog | Network Router Critical Power Sequencing |
Use Scenario: Ultrasound processor board where software lockup could compromise patient safety. IC Role / Device Role / Timing Role: Watchdog supervisor with 1.6s timeout and WDO-driven interrupt to force controlled shutdown. Use Value: Detects frozen firmware within 1.6s and asserts RESET to initiate safe state recovery without manual intervention. |
Use Scenario: Multi-rail telecom switch requiring coordinated 5V rail monitoring and memory write protection. IC Role / Device Role / Timing Role: Provides CE gating to block memory access during 5V instability and PFO-driven power-fail alert to host MCU. Use Value: Prevents packet loss by halting DMA transfers before VCC drops below 4.4V, using PFO to trigger graceful traffic shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693AESE+ | Same 4.4V reset threshold and TSSOP-16 package; wider -40°C to +85°C temp range vs. MAX800MCUE+'s 0°C to +70°C. | Required for extended-temperature industrial deployments; identical pinout and electrical behavior. | Select MAX693AESE+ when operating outside commercial temperature range but retaining same 5V monitoring function. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no battery switchover or CE gating; 1.8µA quiescent current vs. 30µA. | Suitable only for 3.3V systems; lacks MAX800MCUE+'s backup power management and memory protection features. | Choose TPS3808G33DBVR only for low-quiescent 3.3V applications where battery backup and CE control are unnecessary. |
Compared with MAX693AESE+, MAX800MCUE+ offers identical core supervision but targets commercial-temperature cost-sensitive designs; versus TPS3808G33DBVR, it provides full 5V system coverage with integrated battery switchover and hardware write protection - making it irreplaceable in legacy 5V controller architectures requiring RAM retention.
Availability
MAX800MCUE+ is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic equipment, and network infrastructure requiring stable component supply with full traceability and lifecycle support.
Supply support for MAX800MCUE+ 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, communications, and computing markets.
The MAX800M family was designed specifically for 5V microprocessor systems needing precise reset control, battery-backed memory retention, and hardware-enforced write protection - addressing reliability gaps in legacy controller and instrumentation platforms.
FAQ
What is the guaranteed reset threshold voltage tolerance for MAX800MCUE+?
The MAX800MCUE+ has a guaranteed reset threshold voltage of 4.25V to 4.50V (min to max) at TA = TMIN to TMAX, with 4.40V typical. This 4.4V specification ensures consistent brownout detection across the full operating temperature range and process variation, directly supporting reliable 5V system reset behavior without external trimming.
Does MAX800MCUE+ support battery backup for CMOS RAM, and how does switchover work?
Yes, MAX800MCUE+ supports battery backup via the VBATT pin. Switchover occurs automatically when VCC falls below VBATT − 0.3V (with 60mV hysteresis), connecting VBATT to VOUT through a low-leakage PMOS switch. In this mode, VOUT remains powered, RESET stays asserted, and CE gating disables - preserving RAM contents and preventing corruption during mains loss.
Can MAX800MCUE+ be used with 3.3V microprocessors?
No - MAX800MCUE+ is specified exclusively for 5V systems: its reset threshold is fixed at 4.4V, VCC operating range is 4.5V–5.5V, and all outputs (RESET, WDO, PFO) are referenced to VOUT/VCC. Using it with 3.3V logic requires level-shifting and risks incorrect reset assertion; a dedicated 3.3V supervisor like TPS3808G33DBVR is recommended instead.
How does the chip-enable gating function protect memory in MAX800MCUE+?
The MAX800MCUE+ gates CE signals between CE IN and CE OUT using a transmission gate that disables automatically when RESET is asserted (i.e., during power-up, brownout, or watchdog timeout). This blocks all CE transitions to external memory, preventing partial or corrupted writes to CMOS RAM/EEPROM - a critical safeguard during unstable power conditions.
What is the maximum continuous output current capability of MAX800MCUE+ on the VOUT pin?
MAX800MCUE+ delivers up to 250mA continuous current from VOUT when sourced from VCC (VCC-to-VOUT on-resistance ≤1.4Ω), and up to 25mA when sourced from VBATT (VBATT-to-VOUT on-resistance ≤30Ω). Exceeding these limits risks thermal overload or voltage droop beyond design specifications.
MAX800MCUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
MAX800MCUE+ FAQ
1.How can I place an order for MAX800MCUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX800MCUE+ 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 MAX800MCUE+ reliable?
The price and inventory of MAX800MCUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX800MCUE+ is usually 5 days.
3.What payment methods are accepted for MAX800MCUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX800MCUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX800MCUE+?
MAX800MCUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX800MCUE+ 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 MAX800MCUE+?
For technical support, including MAX800MCUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX800MCUE+ requirements.
6.How does Aetrix verify that MAX800MCUE+ is sourced from the original manufacturer or authorized distributors?
All MAX800MCUE+ 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 MAX800MCUE+ meets industry standards.
7.What is the process for return or replacement of MAX800MCUE+?
All MAX800MCUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX800MCUE+, 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 MAX800MCUE+ part is unused and in its original packaging.
Return procedure for MAX800MCUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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