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Analog Devices Inc./Maxim Integrated MAX695EWE+T
- Part No.:
- MAX695EWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX695EWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,287
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Product details
Overview
MAX695EWE+T from Maxim Integrated is a 16-pin microprocessor supervisory circuit providing precision reset generation (4.65V threshold), adjustable watchdog timeout (100ms/1.6s), battery backup switchover (2.0–4.25V VBATT), CE gating for RAM write protection, and 1.3V power-fail detection. It operates across –40°C to +85°C and supports industrial embedded systems requiring robust power monitoring and data integrity during brownouts.
For engineers reviewing the MAX695EWE+T datasheet, MAX695EWE+T pinout, MAX695EWE+T application, or MAX695EWE+T equivalent, this page delivers verified functional scope, exact timing values (200ms reset delay, 1.6s watchdog), terminal roles (CE IN/OUT, BATT ON, OSC SEL), and real-world design implications for µP reset coordination, battery-backed RAM retention, and NMI-triggered power-fail response.
Technical Context
The MAX695EWE+T integrates five core supervisory functions in a single 16-pin SOIC package: a precision 4.65V ±150mV reset comparator with 200ms timeout, an adjustable watchdog timer (100ms or 1.6s via OSC SEL/OSC IN), bidirectional battery switchover (VBATT to VOUT with 70mV rise/50mV fall hysteresis), CE IN/CE OUT gating logic that forces CE OUT high when VCC drops below 4.65V, and a 1.3V PFI comparator driving PFO for early power-fail warning.
Its architecture includes an internal oscillator (enabled by floating OSC SEL), a transition-sensitive WDI input with mid-supply bias (38% VCC), and dedicated outputs-BATT ON (25mA sink), LOW LINE (fast-reset indicator), WDO (watchdog fault flag), and dual RESET (active-low and active-high). All logic thresholds and timing parameters are specified over –40°C to +85°C with guaranteed min/max limits-not typical-only values.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable reset assertion for +5V ±5% supplies; hysteresis prevents chatter near threshold. |
| Reset Timeout Delay | 200ms - holds RESET low long enough for slow-starting crystal oscillators and full µP initialization sequences. |
| Watchdog Timeout | 100ms or 1.6s (selectable) - provides flexible software execution monitoring; longer period accommodates boot-time delays. |
| Battery Voltage Range | 2.0V to 4.25V - supports common lithium and coin-cell backups while maintaining VOUT regulation during switchover. |
| CE Gating Logic | VCC-dependent forced-high CE OUT below 4.65V - blocks RAM writes during undervoltage, preventing corruption without external logic. |
| Power-Fail Detection | 1.3V PFI threshold - enables early warning (e.g., at 4.8V VCC) via resistor divider, giving µP time to save data before RESET asserts. |
| Supply Current (Backup) | 1µA max - extends 3V coin-cell life to >10 years in standby, critical for real-time clock and memory retention. |
Pinout & Package
MAX695EWE+T is housed in a 16-pin wide-body SOIC (SOIC-W) package (suffix "EWE"), measuring 7.5mm × 10.3mm, with standard 1.27mm pitch and exposed pad for thermal performance. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | +5V main supply input; powers all internal circuits; monitored for reset and watchdog functions. |
| 2 | VBATT | Backup battery input; automatically selected over VCC when VCC falls below VBATT − 50mV (power-down) or VBATT + 70mV (power-up). |
| 3 | VOUT | Switched output delivering higher of VCC or VBATT; supplies CMOS RAM; rated for 50mA from VCC, 250µA from VBATT. |
| 4 | GND | Ground reference for all analog and digital sections; must be low-impedance connection to system ground plane. |
| 5 | PFI | Noninverting input to 1.3V comparator; used with external resistor divider to detect power fail or low-battery condition. |
| 6 | PFO | Active-low power-fail output; drives µP NMI line when PFI < 1.3V; short-circuit protected, 3.2mA sink capability. |
| 7 | OSC IN | Oscillator input; accepts external clock (0–250kHz) or capacitor (e.g., 47pF) to adjust reset/watchdog timing periods. |
| 8 | OSC SEL | Oscillator select; internal 3µA pullup; floating/high selects internal oscillator; low enables external timing source. |
| 9 | WDI | Watchdog input; three-level (low/mid/high); toggling required within timeout; floating disables watchdog. |
| 10 | WDO | Active-low watchdog output; goes low on timeout and stays low until next WDI transition; indicates fault independently of RESET. |
| 11 | RESET | Active-low reset output; asserted for 200ms after VCC recovery or watchdog timeout; drives µP reset pin directly. |
| 12 | RESET | Active-high reset output; inverted complement of pin 11; useful for logic-level translation or OR-ing with other reset sources. |
| 13 | CE IN | Chip-enable gating input; connected to µP CE/CS signal; CE OUT mirrors CE IN only when VCC ≥ 4.65V. |
| 14 | CE OUT | Controlled chip-enable output; forced high when VCC < 4.65V to prevent RAM writes during brownout or power loss. |
| 15 | BATT ON | Active-high battery-on indicator; sinks 25mA; drives base of external PNP transistor to boost VOUT current beyond 50mA. |
| 16 | LOW LINE | Fast-reset indicator; goes low immediately when VCC drops below 4.65V and returns high as soon as VCC rises above threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset & Watchdog Timing | 200ms reset delay and 100ms/1.6s watchdog timeout selectable via OSC SEL/OSC IN - eliminates fixed-timing constraints in diverse firmware architectures. |
| Integrated CE Gating Logic | Hardware-enforced CE OUT disable below 4.65V - removes need for external voltage supervisor or logic gates to protect battery-backed RAM. |
| Low-Power Battery Backup Mode | 1µA max supply current with VCC = 0V and VBATT = 2.8V - enables multi-year operation on CR2032 cells without compromising data retention. |
| Dual Reset Outputs | Simultaneous active-low (pin 11) and active-high (pin 12) RESET signals - simplifies interface to µPs with differing reset polarity requirements. |
| Programmable Power-Fail Warning | 1.3V PFI comparator with PFO output - allows configurable early-warning window (e.g., 4.8V → 4.65V) for safe data save before hard reset. |
| Battery Switchover Hysteresis | 20mV comparator hysteresis with 70mV/50mV switching thresholds - prevents chattering during slow VCC ramp-down or noisy battery transitions. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
|
Use Scenario: Programmable logic controllers operating in factory environments with fluctuating 24VDC supplies converted to +5V. IC Role / Device Role / Timing Role: MAX695EWE+T monitors VCC, asserts RESET on brownout, triggers NMI via PFO for emergency state save, and gates RAM CE during undervoltage. Use Value: Prevents corrupted control logic and lost I/O state during transient line sags; 200ms reset hold ensures deterministic µP restart after 24V recovery. |
Use Scenario: Portable ultrasound or ECG units using coin-cell backup to retain calibration data and patient history during AC power loss. IC Role / Device Role / Timing Role: MAX695EWE+T switches VOUT to VBATT, enables CE gating to lock RAM writes, and uses PFO to initiate secure data dump before shutdown. Use Value: Guarantees zero data loss during power interruption; 1µA backup current extends CR2032 life beyond 10 years per IEC 62304 requirements. |
| Automotive Infotainment Head Units | Smart Grid Meters |
|
Use Scenario: In-vehicle infotainment systems powered from 12V battery with wide cold-crank voltage dips (down to 3.5V). IC Role / Device Role / Timing Role: MAX695EWE+T detects VCC drop below 4.65V, asserts LOW LINE for immediate firmware response, and holds RESET for 200ms after recovery to stabilize DDR memory. Use Value: Avoids display glitches and audio artifacts during engine start; BATT ON output drives external PNP to sustain 100mA RAM load during cranking. |
Use Scenario: Revenue-grade electricity meters deployed in unattended outdoor substations with supercapacitor backup. IC Role / Device Role / Timing Role: MAX695EWE+T monitors regulated +5V rail, triggers PFO-based NMI for last-read energy accumulation, and gates EEPROM write enable during brownout. Use Value: Meets ANSI C12.1 and IEC 62053 accuracy mandates by ensuring meter registers never update during unstable supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX695ESE+ | Same electrical specs and pinout, but in narrow-body SOIC (SOIC-N); 3.9mm width vs. 7.5mm of MAX695EWE+T. | Preferred where PCB space is constrained and thermal dissipation is less critical than in industrial enclosures. | Select MAX695ESE+ only if board layout requires narrower package; verify thermal margin under 50mA VOUT load. |
| MAX695CPE+ | Same functionality, but in 16-pin PDIP package; wider temperature range (0°C to +70°C) vs. MAX695EWE+T's –40°C to +85°C. | Suitable for commercial-grade lab equipment or non-automotive embedded systems without extended temp needs. | Choose MAX695CPE+ for prototyping or cost-sensitive consumer applications; avoid for automotive or outdoor deployments. |
Compared with MAX695EWE+T, MAX695ESE+ offers identical supervision features in a space-saving SOIC-N footprint but with reduced thermal mass, while MAX695CPE+ trades industrial temperature rating for through-hole assembly compatibility and lower unit cost-neither is pin-compatible due to differing package dimensions and thermal profiles.
Availability
MAX695EWE+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive infotainment head units, and smart grid meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX695EWE+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) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications, with emphasis on reliability, low power, and integration.
The MAX690–MAX695 family was engineered specifically for µP-based systems needing coordinated reset, watchdog, battery switchover, and power-fail warning in one compact device-targeting applications where data integrity and fail-safe startup are non-negotiable.
FAQ
What is the reset timeout delay of the MAX695EWE+T, and how is it configured?
The MAX695EWE+T has a fixed 200ms reset timeout delay after VCC recovers above 4.65V. This value is inherent to the MAX695 variant and cannot be adjusted via external components-it differs from the MAX691/MAX693 (50ms) and is set by internal timing circuitry tied to the oscillator configuration. The 200ms hold ensures µPs with slow-starting clocks complete initialization before release. This specification is guaranteed across –40°C to +85°C and appears in the Electrical Characteristics table of the MAX695EWE+T datasheet.
Does the MAX695EWE+T support adjustable watchdog timeout, and what are the valid settings?
Yes, the MAX695EWE+T supports two selectable watchdog timeout periods: 100ms and 1.6s. Selection is controlled by the logic level on OSC IN while OSC SEL is floating (internally pulled high). When OSC IN is low, the 100ms timeout is active; when OSC IN is high or floating, the 1.6s timeout applies. Both periods are guaranteed over temperature and supply voltage, and the watchdog resets on each WDI transition-ensuring deterministic firmware health monitoring in safety-critical applications.
How does the CE gating function work on the MAX695EWE+T, and what is its purpose?
The MAX695EWE+T uses CE IN and CE OUT pins to enforce hardware write protection on battery-backed RAM. When VCC ≥ 4.65V, CE OUT replicates CE IN with ~50ns delay. If VCC drops below 4.65V, CE OUT is forced high regardless of CE IN state-blocking write access to RAM during brownout or power loss. This prevents data corruption without requiring external logic or firmware intervention, making it essential for systems storing calibration data or real-time logs.
What is the battery voltage range supported by the MAX695EWE+T, and how does switchover hysteresis affect reliability?
The MAX695EWE+T supports VBATT from 2.0V to 4.25V, compatible with common lithium coin cells and rechargeable batteries. Its battery switchover comparator includes 20mV hysteresis, with switch points at VCC = VBATT + 70mV (rising) and VCC = VBATT + 50mV (falling). This prevents rapid toggling during slow VCC ramps or noisy battery transitions-critical for maintaining stable VOUT during marginal supply conditions and extending backup runtime.
Can the MAX695EWE+T be used with a 3.3V microprocessor system?
No-the MAX695EWE+T is designed exclusively for +5V systems. Its reset threshold is fixed at 4.65V, its VCC operating range is 4.75V to 5.5V, and all internal references (1.3V PFI, 4.65V reset) scale with VCC. Using it with 3.3V violates Absolute Maximum Ratings (VCC must be ≥4.75V) and invalidates all timing and threshold specifications. For 3.3V supervision, consider the MAX6361 or MAX6363 families instead.
MAX695EWE+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:
- 4.65V
- Output:
- Push-Pull, Push-Pull
- 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
MAX695EWE+T FAQ
1.How can I place an order for MAX695EWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX695EWE+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 MAX695EWE+T reliable?
The price and inventory of MAX695EWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX695EWE+T is usually 5 days.
3.What payment methods are accepted for MAX695EWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX695EWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX695EWE+T?
MAX695EWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX695EWE+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 MAX695EWE+T?
For technical support, including MAX695EWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX695EWE+T requirements.
6.How does Aetrix verify that MAX695EWE+T is sourced from the original manufacturer or authorized distributors?
All MAX695EWE+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 MAX695EWE+T meets industry standards.
7.What is the process for return or replacement of MAX695EWE+T?
All MAX695EWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX695EWE+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 MAX695EWE+T part is unused and in its original packaging.
Return procedure for MAX695EWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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