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Analog Devices Inc./Maxim Integrated MAX695CWE+
- Part No.:
- MAX695CWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX695CWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,629
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Product details
Overview
The MAX695CWE+ from Maxim Integrated is a 16-pin microprocessor supervisory circuit providing reset generation, adjustable watchdog timer, battery backup switchover, power-fail detection, and CE gating for CMOS RAM/EEPROM protection. It features a 4.65V reset threshold, 200ms reset timeout, 1.6s/100ms selectable watchdog period, 1.3V PFI comparator, and operates from 4.75V to 5.5V VCC with 2.0V–4.25V VBATT support. It is used in industrial controllers and intelligent instruments requiring reliable power monitoring and data integrity during brownouts.
For engineers reviewing the MAX695CWE+ datasheet, MAX695CWE+ pinout, MAX695CWE+ application, or MAX695CWE+ equivalent, key selection criteria include its 16-pin SOIC-W package, active-low RESET with 200ms delay, dual-mode watchdog (internal oscillator or external clock), BATT ON and LOW LINE status outputs, and integrated CE OUT write-protection logic - all critical for embedded systems with battery-backed memory.
Technical Context
The MAX695CWE+ implements a precision voltage monitor with 4.65V ±150mV reset threshold and 40mV hysteresis, ensuring stable reset assertion during VCC transients. Its internal oscillator supports two watchdog timeout modes (100ms short, 1.6s long), configurable via OSC SEL and OSC IN pins, and resets on every WDI transition - not level - enabling robust software execution verification.
It integrates a bidirectional battery switchover circuit with 70mV power-up / 50mV power-down threshold and 20mV hysteresis, delivering VOUT from either VCC or VBATT. The CE gating function forces CE OUT high when VCC drops below 4.65V, independently of CE IN, preventing erroneous writes to CMOS RAM during undervoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V (min 4.5V, max 4.75V); ensures compatibility with +5V ±5% supplies and prevents premature reset release. |
| Reset Timeout Delay | 200ms (typical); holds RESET low long enough for microprocessor clock stabilization after power-up. |
| Watchdog Timeout | Selectable 100ms or 1.6s; enables flexible firmware supervision without external timing components. |
| Battery Switchover Threshold | VCC − VBATT = 70mV (power-up), 50mV (power-down); prevents oscillation during slow VCC decay near battery voltage. |
| PFI Comparator Threshold | 1.3V (min 1.2V, max 1.4V); allows precise early power-fail warning before VCC reaches reset threshold. |
| Supply Current (Battery Mode) | 1µA max at VCC = 0V, VBATT = 2.8V; extends lithium or coin-cell backup battery life for years. |
| CE Propagation Delay | 50ns to 200ns; ensures fast, deterministic write-protection activation during VCC collapse. |
Pinout & Package
MAX695CWE+ is housed in a 16-pin Wide SOIC (SOIC-W) package with 0.3-inch body width and standard 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | +5V main supply input; monitored for reset generation and CE gating enable. |
| 2 | VBATT | Backup battery input; powers VOUT when VCC falls below switchover threshold. |
| 3 | VOUT | Switched output; delivers higher of VCC or VBATT to CMOS RAM; rated for 50mA. |
| 4 | GND | Ground reference for all analog and digital functions; must be low-impedance. |
| 5 | BATT ON | Active-high indicator; signals VBATT is active; sinks 25mA to drive external PNP transistor base. |
| 6 | LOW LINE | Active-low VCC monitor; goes low immediately when VCC < 4.65V; no delay. |
| 7 | OSC IN | Oscillator input; accepts external clock (0–250kHz) or capacitor for timing adjustment. |
| 8 | OSC SEL | Oscillator select; floating/high enables internal oscillator; low enables external clock/capacitor mode. |
| 9 | PFI | Power-fail input; noninverting comparator input referenced to 1.3V internal bandgap. |
| 10 | PFO | Power-fail output; active-low open-drain signal for NMI or alarm generation. |
| 11 | WDI | Watchdog input; three-level (low/mid/high); reset triggered by lack of edge transitions. |
| 12 | CE IN | Chip-enable gate input; buffered to CE OUT unless VCC drops below reset threshold. |
| 13 | CE OUT | Chip-enable gate output; forced high during undervoltage to block RAM writes. |
| 14 | WDO | Watchdog output; active-low; remains low until next WDI transition after timeout. |
| 15 | RESET | Active-low reset output; 200ms pulse width; drives µP reset line directly. |
| 16 | RESET | Active-high reset output; inverted complement of pin 15; for logic-level compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Timeout | 200ms fixed for MAX695CWE+, eliminating need for external RC timing network. |
| Dual-Mode Watchdog Timer | Configurable via OSC SEL/OSC IN for 100ms or 1.6s timeout - no firmware rework needed for timing changes. |
| Integrated CE Gating Logic | Forces CE OUT high during VCC undervoltage, blocking RAM writes without external logic gates or pull-ups. |
| Low-Power Battery Backup | 1µA max quiescent current in backup mode extends 3V lithium battery life beyond 10 years in typical applications. |
| Robust Switchover Hysteresis | 20mV hysteresis prevents chattering during slow VCC decay near VBATT, ensuring clean VOUT handover. |
Applications
| Industrial Controllers | Intelligent Instruments |
|---|---|
Use Scenario: PLCs and RTUs operating in remote, unattended locations with intermittent AC power and battery backup. IC Role / Device Role / Timing Role: MAX695CWE+ provides supervised reset, watchdog supervision, and automatic RAM backup switchover during grid outages. Use Value: Prevents data corruption and system lockup during brownouts; 200ms reset delay ensures reliable µP boot after generator start-up. | Use Scenario: Portable multimeters and calibration equipment with nonvolatile memory storing user settings and calibration coefficients. IC Role / Device Role / Timing Role: MAX695CWE+ monitors VCC, asserts PFO for early power-fail interrupt, and gates CE to preserve EEPROM contents during battery swap. Use Value: 1.3V PFI comparator enables precise warning 10–15ms before VCC drops below 4.65V, allowing safe save-to-EEPROM sequence. |
| Automotive Telematics | Critical µP Power Monitoring |
Use Scenario: In-vehicle infotainment gateways that retain configuration and GPS last-known position during ignition-off battery drain. IC Role / Device Role / Timing Role: MAX695CWE+ switches VOUT to VBATT, asserts BATT ON to enable external pass transistor, and holds RESET until stable VCC returns. Use Value: BATT ON output drives PNP base directly, supporting >500mA RAM rail current while maintaining sub-1µA standby draw. | Use Scenario: Medical diagnostic devices where RAM data loss during power interruption could compromise patient safety. IC Role / Device Role / Timing Role: MAX695CWE+ combines CE OUT write protection, LOW LINE immediate undervoltage flag, and 200ms RESET hold for fail-safe state capture. Use Value: CE OUT propagation delay ≤200ns guarantees write-blocking activation before first invalid µP instruction fetch during brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX695CPE+ | Same electrical specs, but in 16-pin PDIP package (0.3-inch width); higher thermal resistance and larger footprint. | Suitable for prototyping or through-hole assembly; not recommended for space-constrained PCBs. | Select MAX695CWE+ for surface-mount production; choose MAX695CPE+ only if DIP socketing or manual soldering is required. |
| MAX695EWE+ | Extended temperature range (−40°C to +85°C) vs. MAX695CWE+ (0°C to +70°C); identical pinout and functionality. | Required for automotive under-hood or industrial outdoor deployments where ambient exceeds 70°C. | Use MAX695EWE+ when operating temperature exceeds 70°C; otherwise MAX695CWE+ meets commercial-grade requirements. |
Compared with MAX695CWE+, MAX695CPE+ offers identical supervision features in a through-hole package but sacrifices board density and thermal performance, while MAX695EWE+ adds extended temperature capability without trade-offs in size or cost - making it the preferred upgrade path for harsh environments.
Availability
MAX695CWE+ is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, automotive telematics, and critical µP power monitoring applications requiring stable component supply across multi-year production cycles.
Supply support for MAX695CWE+ 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, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX695CWE+ belongs to the MAX690–MAX695 family of microprocessor supervisory circuits, engineered specifically to consolidate reset, watchdog, battery switchover, and memory write protection into a single 16-pin IC for space- and reliability-critical embedded systems.
FAQ
What is the reset timeout delay of the MAX695CWE+?
The MAX695CWE+ has a fixed reset timeout delay of 200ms after VCC rises above the 4.65V threshold. This delay is internally generated and does not require external components. It ensures the microprocessor's clock oscillator has fully stabilized before releasing the RESET signal. The 200ms value is specific to the MAX695CWE+ variant and differs from the 50ms delay of the 8-pin MAX690 series. This timing is guaranteed over the full 0°C to +70°C operating range.
Does the MAX695CWE+ support adjustable watchdog timeout periods?
Yes, the MAX695CWE+ supports two selectable watchdog timeout periods: 100ms and 1.6s. Selection is controlled by the logic state of the OSC SEL and OSC IN pins per Table 1 in the datasheet. When OSC SEL is floating and OSC IN is low, the 100ms timeout is active; when both are floating, the 1.6s timeout applies. The MAX695CWE+ does not support continuous adjustment - only these two discrete modes - and requires no external timing components.
How does the CE OUT pin of the MAX695CWE+ protect CMOS RAM during power failure?
The CE OUT pin of the MAX695CWE+ is designed to force a high logic level whenever VCC drops below the 4.65V reset threshold - regardless of the state of CE IN. This action disables the chip-enable input of connected CMOS RAM or EEPROM, preventing any write operations during undervoltage conditions. The propagation delay is specified at 50ns to 200ns, ensuring rapid response to VCC collapse. This hardware-enforced write protection eliminates reliance on firmware or external logic, making it ideal for fail-safe data retention.
What is the battery voltage range supported by the MAX695CWE+?
The MAX695CWE+ supports a backup battery voltage range of 2.0V to 4.25V on the VBATT pin. This range accommodates common lithium coin cells (e.g., CR2032, 3.0V nominal) and rechargeable Li-ion/Li-poly cells (up to 4.2V). The device includes built-in battery charging current compensation (~10nA typical) that offsets self-discharge, extending shelf life. Operation outside this range - such as with 1.5V alkaline cells - is not supported and may cause improper switchover or reset behavior.
Can the MAX695CWE+ be used with a 3.3V microprocessor system?
No, the MAX695CWE+ is not designed for direct use with 3.3V microprocessor systems. Its reset threshold is fixed at 4.65V, and it requires a VCC supply of 4.75V to 5.5V. The internal comparators, CE gating logic, and VOUT switching circuitry are all optimized for 5V operation. Using it with a 3.3V VCC would prevent proper reset assertion and disable CE OUT functionality. For 3.3V systems, consider the MAX6361 or MAX6363 families, which offer 3.08V or 3.3V reset thresholds and compatible supervision features.
MAX695CWE+ 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:
- 4.65V
- Output:
- Push-Pull, 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-SOIC
MAX695CWE+ FAQ
1.How can I place an order for MAX695CWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX695CWE+ 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 MAX695CWE+ reliable?
The price and inventory of MAX695CWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX695CWE+ is usually 5 days.
3.What payment methods are accepted for MAX695CWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX695CWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX695CWE+?
MAX695CWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX695CWE+ 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 MAX695CWE+?
For technical support, including MAX695CWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX695CWE+ requirements.
6.How does Aetrix verify that MAX695CWE+ is sourced from the original manufacturer or authorized distributors?
All MAX695CWE+ 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 MAX695CWE+ meets industry standards.
7.What is the process for return or replacement of MAX695CWE+?
All MAX695CWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX695CWE+, 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 MAX695CWE+ part is unused and in its original packaging.
Return procedure for MAX695CWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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