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Analog Devices Inc./Maxim Integrated MAX807NEWE+
- Part No.:
- MAX807NEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX807NEWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,428
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Product details
Overview
The MAX807NEWE+ from Maxim Integrated is a full-featured microprocessor supervisory circuit designed for power monitoring, battery switchover, and watchdog protection in 5V µP systems. It provides ±1.5% reset threshold accuracy (4.575V), 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 critical embedded controllers requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX807NEWE+ datasheet, MAX807NEWE+ pinout, MAX807NEWE+ application, or MAX807NEWE+ equivalent, key selection criteria include its 4.575V reset threshold with 1.5% tolerance, guaranteed RESET validity down to VCC = 1V, low-line comparator with 52mV offset above reset threshold, and integrated chip-enable gating with 2ns propagation delay - all validated for industrial temperature range (–40°C to +85°C) in TSSOP-16 package.
Technical Context
The MAX807NEWE+ integrates seven functional blocks: reset comparator with hysteresis, low-line comparator (52mV above reset threshold), power-fail comparator (2.265V threshold), battery-OK detector (2.265V), watchdog timer (1.6s timeout), manual-reset input with internal pullup, and bidirectional CE gating path. Its BiCMOS process enables 70µA typical supply current in normal mode and 1µA standby current in battery-backup mode while maintaining precise voltage thresholds.
All logic outputs (RESET, RESET, WDO, PFO, BATT OK, LOW LINE, BATT ON, CE OUT) are CMOS-compatible, rail-to-rail (VCC/GND or higher-of-VCC/VBATT), and specified across –40°C to +85°C. The device supports seamless switchover between VCC and VBATT for CMOS RAM backup, with on-resistance of 1.2Ω (VCC→OUT) and 16Ω (VBATT→OUT), and guarantees valid reset assertion even when VCC drops to 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - ensures µP reset before system-level timing violations occur at nominal 5V supply |
| Reset Timeout Period | 200ms - provides sufficient time for µP initialization and register clearing after power-up or brownout recovery |
| Watchdog Timeout | 1.6s typical - detects µP lockup without requiring external timing components |
| VCC Supply Current | 70µA typical - enables long battery life in portable equipment without compromising supervision accuracy |
| Output Drive Capability | 250mA from VCC / 20mA from battery - powers CMOS RAM, RTC, or small logic loads directly without external buffers |
| Low-Line Threshold Offset | 52mV above reset threshold - enables early NMI-triggered shutdown with 13mV hysteresis for noise immunity |
| CE Propagation Delay | 2ns - preserves high-speed memory access integrity during power transitions |
Pinout & Package
The MAX807NEWE+ is supplied in a 16-pin TSSOP package (4.4mm × 5.0mm, 0.65mm pitch), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Noninverting input of uncommitted comparator; triggers PFO low when voltage falls below 2.265V - used for preregulated supply monitoring |
| PFO | Power-Fail Output | Active-low CMOS output asserting NMI on falling supply; sinks 3.2mA at 0.1V saturation |
| GND | Ground Reference | Common return for all analog and digital functions; bypass capacitor required at VCC and OUT pins |
| VCC | Main Supply Input | Nominal +5V input (4.50V–5.5V operating range); powers internal circuitry and drives CE OUT and RESET outputs |
| BATT | Backup Battery Input | Accepts 2.0V–6V battery; enables automatic switchover to preserve RAM/RTC data during main supply failure |
| OUT | Output Supply Voltage | Switched output connected to VCC or BATT; delivers regulated power to CMOS RAM with <1.2Ω on-resistance |
| RESET | Active-Low Reset Output | Strong-pull-down/weak-pullup output asserted during power-up/down/brownout; valid down to VCC = 1V |
| RESET | Active-High Reset Output | Inverted CMOS output sourcing/sinking current; not wire-OR capable but fully rail-to-rail |
| WDO | Watchdog Fault Output | Asserts low if WDI is not toggled within 1.6s; connects to MR to generate automatic watchdog resets |
| CE OUT | Chip-Enable Output | Gated CE signal passed from CE IN; pulled to higher-of-VCC/VBATT when disabled to prevent memory corruption |
| CE IN | Chip-Enable Input | High-impedance during reset (±1µA leakage); series 75Ω resistance in enabled mode for controlled drive |
| MR | Manual Reset Input | Active-low input with 50–200µA internal pullup; asserts reset for ≥1µs pulse and holds 200ms after release |
| LOW LINE | Low-Line Comparator Output | Asserts low when VCC falls to 52mV above reset threshold; generates NMI for software-controlled shutdown |
| BATT ON | Battery-On Status Flag | Indicates OUT is connected to BATT; drives external PNP/PMOS switch for >250mA load requirements |
| BATT OK | Battery-OK Status Flag | High when VBATT > 2.265V; confirms backup battery is present and above minimum operating voltage |
| WDI | Watchdog Input | Edge-sensitive input; internal voltage divider disables watchdog if left floating (1.8V typical) |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% Reset Threshold Accuracy | Enables stable operation across wide temperature range (–40°C to +85°C) without calibration, reducing BOM cost vs. discrete solutions |
| Guaranteed RESET Validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout conditions where other supervisors fail |
| Integrated Chip-Enable Gating | Prevents spurious memory writes during power transitions via 2ns CE propagation delay and automatic disable on reset |
| Dual-Mode Power Switching | Delivers 250mA from VCC or 20mA from battery without external MOSFETs - simplifies backup power architecture |
| Two-Stage Power-Fail Warning | Combines PFI/PFO (2.265V) and LOW LINE (52mV above reset) for flexible early-warning and final-fail detection |
| MaxCap®/SuperCap® Compatibility | Supports high-capacitance backup capacitors without oscillation or instability during switchover |
Applications
| Portable Data Loggers | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered field instruments logging sensor data over extended periods with infrequent host communication. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed RAM retention, and watchdog fault detection to prevent corrupted logs. Use Value: 70µA supply current extends battery life; 200ms reset timeout ensures clean µP restart; 4.575V threshold aligns with 5V LDO dropout margins. |
Use Scenario: DIN-rail mounted programmable logic controllers operating in factory environments with fluctuating 24VDC supplies. IC Role / Device Role / Timing Role: System-level power monitor generating NMI via LOW LINE for controlled I/O freeze and safe state entry prior to reset. Use Value: 52mV low-line offset enables 200ms+ warning window before reset; –40°C to +85°C rating ensures reliability in uncontrolled cabinets. |
| Medical Infusion Pumps | Point-of-Sale Terminals |
Use Scenario: Life-critical infusion devices requiring fail-safe power management and tamper-resistant firmware execution. IC Role / Device Role / Timing Role: Dual-role supervisor: reset generator during AC loss and watchdog enforcer for motor control firmware loops. Use Value: WDO-to-MR connection creates automatic watchdog resets; BATT OK flag validates backup power before disabling safety interlocks. |
Use Scenario: Retail terminals with flash-based firmware and SRAM caches, exposed to frequent power cycling and ESD events. IC Role / Device Role / Timing Role: Power integrity guardian preventing EEPROM corruption during brownouts via CE gating and write-protection logic. Use Value: CE IN/OUT path blocks invalid memory writes during reset; 2.275V PFI threshold monitors 3.3V supply rails independently of main 5V domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | SOT23-3, single active-low reset only, no watchdog, no battery switchover, 4.63V threshold | Limited to basic reset-only use cases; unsuitable for RAM backup or watchdog-critical systems | Select only when size and cost outweigh need for supervision features beyond reset |
| TPS3808G12DBVR | SOT23-6, adjustable reset threshold (1.2V–5.5V), 200ms timeout, no battery switchover or CE gating | Flexible threshold but lacks integrated power-path control and backup monitoring required for portable RAM retention | Choose when custom voltage monitoring is needed but battery backup is handled externally |
Compared with MAX807NEWE+, the MAX809SEUR+T reduces footprint and cost but sacrifices all advanced supervision features; the TPS3808G12DBVR offers voltage flexibility yet requires external circuitry for battery switchover and CE protection - neither matches the integrated functionality and guaranteed 1V reset validity of the MAX807NEWE+.
Availability
The MAX807NEWE+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, and medical devices requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.
Supply support for MAX807NEWE+ 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 MAX807NEWE+ belongs to Maxim's µP supervisory product line, engineered to consolidate power monitoring, battery backup, and watchdog functions into a single IC for space-constrained, reliability-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX807NEWE+ and how tightly is it specified?
The MAX807NEWE+ has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature (–40°C to +85°C), meaning the actual threshold falls between 4.500V and 4.650V. This precision is achieved using BiCMOS technology and is guaranteed by production testing - critical for systems where 5V supply margin is tight and undetected brownout could cause data corruption. The MAX807NEWE+ datasheet specifies this value under "ELECTRICAL CHARACTERISTICS" with VRST parameter.
Does the MAX807NEWE+ support battery backup for CMOS RAM, and what are the current limits?
Yes, the MAX807NEWE+ provides automatic switchover from VCC to VBATT to maintain power to CMOS RAM during main supply failure. In battery-backup mode, it delivers up to 20mA at OUT with ≤16Ω on-resistance (VBATT→OUT), and guarantees BATT OK status when VBATT exceeds 2.265V. The device also supports external PNP/PMOS switches via the BATT ON output for loads exceeding 20mA - enabling robust RAM retention in portable equipment.
How does the watchdog function work on the MAX807NEWE+, and can it trigger a system reset automatically?
The MAX807NEWE+ watchdog timer asserts WDO low if the WDI input remains static (high or low) for longer than 1.6s. To generate an automatic system reset on each watchdog fault, connect WDO to MR via a diode - this pulls MR low, causing a 200ms reset pulse. The internal timer clears immediately upon reset assertion, ensuring synchronized recovery. WDI can be left unconnected to disable the watchdog, as it defaults to ~1.8V via internal divider.
What is the purpose of the LOW LINE output on the MAX807NEWE+, and how does it differ from the RESET signal?
The LOW LINE output on the MAX807NEWE+ goes low when VCC falls to 52mV above the reset threshold (e.g., ~4.627V for the 4.575V part), providing an early warning before RESET asserts. Unlike RESET - which halts µP execution - LOW LINE is intended to trigger a non-maskable interrupt (NMI) for software-initiated graceful shutdown. Its 13mV hysteresis prevents chatter during slow VCC decay, giving firmware time to save state before power collapse.
Can the MAX807NEWE+ monitor power supplies other than +5V, and how is that configured?
Yes, the MAX807NEWE+ can monitor non-5V supplies using its dedicated PFI input and 2.265V power-fail comparator. To monitor a different voltage (e.g., 3.3V or 12V), connect PFI through a resistor divider that scales the target supply down to 2.265V at the trip point. The PFO output then asserts low when the scaled voltage falls below threshold - enabling early warning for any supply rail, independent of the main VCC domain.
MAX807NEWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.425V
- 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-SOIC
MAX807NEWE+ FAQ
1.How can I place an order for MAX807NEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807NEWE+ 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 MAX807NEWE+ reliable?
The price and inventory of MAX807NEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807NEWE+ is usually 5 days.
3.What payment methods are accepted for MAX807NEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807NEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807NEWE+?
MAX807NEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807NEWE+ 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 MAX807NEWE+?
For technical support, including MAX807NEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807NEWE+ requirements.
6.How does Aetrix verify that MAX807NEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX807NEWE+ 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 MAX807NEWE+ meets industry standards.
7.What is the process for return or replacement of MAX807NEWE+?
All MAX807NEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX807NEWE+, 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 MAX807NEWE+ part is unused and in its original packaging.
Return procedure for MAX807NEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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