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Analog Devices Inc./Maxim Integrated MAX807NEWE+T
- Part No.:
- MAX807NEWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX807NEWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,544
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Product details
Overview
MAX807NEWE+T from Maxim Integrated is a full-featured microprocessor supervisory circuit providing precision reset monitoring (±1.5% accuracy at 4.575V), dual reset outputs (active-low RESET and active-high RESET), manual reset input, independent watchdog timer (1.6s timeout), two-stage power-fail warning (PFI/PFO + LOW LINE), and battery-backed CMOS RAM switchover with 250mA VCC-mode / 20mA battery-backup output drive. It serves as the core power integrity guardian in portable industrial controllers requiring reliable brownout recovery and orderly shutdown.
For engineers reviewing the MAX807NEWE+T datasheet, MAX807NEWE+T pinout, MAX807NEWE+T application, or MAX807NEWE+T equivalent, this page delivers verified functional specifications, validated pin roles, real-world use-case mappings, and technically grounded alternative options - all derived from Maxim's official MAX807L/M/N datasheet Rev 4 (11/05) and confirmed package data for the TSSOP-16 variant.
Technical Context
The MAX807NEWE+T implements a BiCMOS-based supervisory architecture with separate comparators for reset (4.575V ±1.5%), low-line warning (52mV above reset threshold, ±13mV hysteresis), and power-fail detection (2.265V PFI threshold). Its internal state machine coordinates reset assertion, CE gating (2ns propagation delay), and watchdog fault response (WDO → MR coupling).
It integrates bidirectional battery switchover logic that switches OUT between VCC and VBATT based on voltage comparison and hysteresis (VBATT switchover threshold = VBATT − 0.08V typ), while maintaining guaranteed RESET validity down to VCC = 1V and supporting backup-battery monitoring via BATT OK flag (2.265V threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.575V ±1.5% - ensures µP reset before system-level logic instability at nominal +5V supply |
| Reset Timeout Period | 200ms - guarantees sufficient time for µP initialization after power-up or brownout recovery |
| Watchdog Timeout | 1.6s typical - detects software lockup without requiring external timing components |
| VCC Supply Current | 70µA typical - enables long battery life in portable equipment with continuous supervision |
| Output Drive Capability | 250mA in VCC mode / 20mA in battery-backup mode - supports direct driving of RAM power rails without external FETs |
| Low-Line Threshold Offset | 52mV above reset threshold - provides deterministic early warning for controlled shutdown before reset triggers |
| BATT OK Threshold | 2.265V - validates backup battery readiness prior to switchover, preventing data loss during transition |
Pinout & Package
MAX807NEWE+T is packaged in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm lead pitch, JEDEC MO-153 compliant, and rated for -40°C to +85°C operation (E-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Non-inverting comparator input for custom power-fail threshold setting (e.g., preregulated supply monitoring) |
| PFO | Power-Fail Output | Active-low CMOS output asserted when PFI < 2.265V - used for NMI generation or system alert |
| GND | Ground Reference | Primary return path for all analog comparators, digital logic, and output drivers |
| VCC | Main Supply Input | +4.50V to +5.5V nominal supply; powers internal circuitry and enables VCC-to-OUT path |
| BATT | Backup Battery Input | Accepts 2.0V–6.0V battery source; enables automatic switchover when VCC falls below reset threshold |
| OUT | RAM Power Output | Switched output connected to VCC or BATT - supplies CMOS RAM/RTC during main power loss |
| BATT ON | Battery-On Status Flag | CMOS output high when OUT is sourced from BATT - drives external PNP/PMOS switch for >250mA loads |
| LOW LINE | Low-Line Warning Output | Active-low signal triggered when VCC drops to 52mV above reset threshold - initiates non-maskable interrupt |
| RESET | Active-Low Reset Output | Guaranteed valid down to VCC = 1V; strong pulldown/weak pullup structure for wire-OR capability |
| RESET | Active-High Reset Output | Inverse of RESET; full CMOS drive (source/sink) - not wire-OR compatible |
| WDO | Watchdog Fault Output | Asserts low if WDI remains static >1.6s; connects to MR to generate automatic watchdog resets |
| WDI | Watchdog Input | Edge-sensitive input; toggling clears watchdog timer - unconnected disables watchdog function |
| MR | Manual Reset Input | Active-low input with internal 50–200µA pullup; asserts reset for ≥1µs pulse and holds 200ms after release |
| CE IN | Chip-Enable Input | High-impedance during reset; passes CE signals only when system is stable - prevents RAM corruption |
| CE OUT | Chip-Enable Output | Gated CE signal with 2ns propagation delay; pulled to higher of VCC/VBATT when disabled |
| BATT OK | Battery-OK Status Flag | Active-high output indicating VBATT > 2.265V - confirms backup battery readiness pre-switchover |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | Simultaneous active-low RESET and active-high RESET enable flexible interface with diverse µP reset architectures |
| Two-Stage Power Warning | Independent LOW LINE (52mV offset) and PFI/PFO comparators allow layered shutdown sequencing - NMI first, then reset |
| Battery Switchover Logic | Automatic OUT sourcing from BATT when VCC < reset threshold, with hysteresis to prevent chatter during marginal conditions |
| On-Chip CE Gating | 2ns CE IN → CE OUT propagation delay prevents spurious memory writes during power transients |
| Guaranteed Low-Voltage Operation | RESET remains valid down to VCC = 1V - critical for brownout resilience in battery-depleted systems |
| MaxCap®/SuperCap® Compatibility | Supports high-capacitance backup storage solutions without compromising switchover timing or voltage regulation |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Continuous ECG waveform logging during battery-only operation with mains failure detection. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout reset, battery switchover to RAM/RTC, and LOW LINE-triggered NMI for data save before shutdown. Use Value: Prevents data corruption by ensuring RAM retention and controlled firmware save sequence within 52mV warning window before 4.575V reset. |
Use Scenario: Reliable restart after AC power interruption in factory-floor automation hardware. IC Role / Device Role / Timing Role: Core power monitor asserting RESET on undervoltage, enabling watchdog recovery, and gating CE to protect program memory during transients. Use Value: Eliminates need for external reset IC + discrete CE gate + battery switch - reduces BOM count and layout area by 3 components. |
| Handheld Test Instrument | Smart Energy Meter |
Use Scenario: Maintaining calibration constants and measurement history across battery swaps and deep discharge cycles. IC Role / Device Role / Timing Role: Battery-backed RAM supervisor with BATT OK validation and 200ms reset timeout to guarantee safe µP boot state. Use Value: Ensures EEPROM write completion before reset via precise 200ms window - avoids partial writes corrupting calibration tables. |
Use Scenario: Tamper-resistant metering with secure timekeeping and event logging during grid outages. IC Role / Device Role / Timing Role: Dual-supply supervisor managing VCC-powered metrology ASIC and BATT-powered RTC/RAM subsystem. Use Value: Enables seamless transition to backup power with BATT ON flag driving external PMOS switch - sustains real-time clock for >10 years on coin cell. |
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 | Simpler 3-pin SOT23 reset IC; no watchdog, no battery switchover, no CE gating, single 2.93V reset threshold | Only suitable for basic reset-only functions in space-constrained designs where full supervision is unnecessary | Select only if application requires minimal footprint and lacks battery backup, watchdog, or memory protection needs |
| TPS3808G12DBVR | Texas Instruments part with 1.2V reset threshold, adjustable timeout, but no battery switchover, no LOW LINE output, no CE gating | Targeted at low-voltage µPs (e.g., ARM Cortex-M0); lacks multi-rail supervision and RAM power management features | Choose only for sub-1.8V systems where MAX807NEWE+T's 4.575V threshold is incompatible |
Compared with MAX807NEWE+T, both alternatives omit critical functions required for battery-backed µP systems: MAX809SEUS+T lacks supervision depth entirely, while TPS3808G12DBVR omits battery switchover and dual-warning capability - making MAX807NEWE+T the sole option for integrated RAM power control and layered power-fail response.
Availability
MAX807NEWE+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, handheld test instruments, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for MAX807NEWE+T 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+T belongs to Maxim's µP supervisory product line, designed specifically to consolidate reset, watchdog, power-fail warning, and battery switchover functions into a single IC for robust, low-power embedded systems.
FAQ
What is the exact reset threshold voltage for MAX807NEWE+T?
The MAX807NEWE+T has a nominal reset threshold of 4.575V with ±1.5% accuracy over temperature and supply voltage. This value is specified for the 'N' variant in the MAX807L/M/N family and is confirmed in the Electrical Characteristics table (Rev 4, p.3). The threshold remains stable from VCC = 4.50V to 5.5V and is guaranteed valid down to VCC = 1V.
Does MAX807NEWE+T support automatic switchover to backup battery?
Yes, MAX807NEWE+T fully supports automatic battery switchover. When VCC falls below the reset threshold, the device disconnects VCC from OUT and connects BATT to OUT, preserving RAM/RTC power. The switchover threshold is VBATT − 0.08V (typical), with hysteresis to prevent oscillation. BATT OK flag confirms VBATT > 2.265V before transition.
Can MAX807NEWE+T be used without a watchdog function?
Yes, MAX807NEWE+T operates correctly with the watchdog disabled. Leaving WDI unconnected internally biases it to ~1.8V (via internal divider), which disables the watchdog timer and keeps WDO high. No external components or configuration are needed - the rest of the supervisory functions (reset, LOW LINE, PFI/PFO, battery switchover) remain fully operational.
What is the maximum load current supported by MAX807NEWE+T's OUT pin?
MAX807NEWE+T's OUT pin delivers up to 250mA when powered from VCC and up to 20mA when powered from BATT. These values are specified under defined test conditions (VCC = 4.5V, IOUT = 250mA; VBATT = 2.8V, IOUT = 10mA, VCC = 0V) in the Electrical Characteristics table (Rev 4, p.2). For loads exceeding 250mA, use BATT ON to drive an external PNP/PMOS switch.
Is MAX807NEWE+T pin-compatible with other MAX807 variants like MAX807LESE+T?
No, MAX807NEWE+T is not pin-compatible with MAX807LESE+T due to differing reset thresholds and temperature grades, though they share identical pinout and package (TSSOP-16). The 'N' variant has 4.575V reset threshold and -40°C to +85°C rating, while 'L' uses 4.675V and 0°C to +70°C. Functionally identical pin mapping allows PCB reuse only if threshold and temp range match design requirements.
MAX807NEWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX807NEWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX807NEWE+T 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+T reliable?
The price and inventory of MAX807NEWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX807NEWE+T is usually 5 days.
3.What payment methods are accepted for MAX807NEWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX807NEWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX807NEWE+T?
MAX807NEWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX807NEWE+T 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+T?
For technical support, including MAX807NEWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX807NEWE+T requirements.
6.How does Aetrix verify that MAX807NEWE+T is sourced from the original manufacturer or authorized distributors?
All MAX807NEWE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX807NEWE+T?
All MAX807NEWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX807NEWE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX807NEWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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