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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:2,801
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Product details
Overview
MAX695CWE from Maxim Integrated is a 16-pin microprocessor supervisory circuit providing precision reset generation, adjustable watchdog timer, battery backup switchover, power-fail detection, and chip-enable gating for CMOS RAM/EEPROM. It features 4.65V reset threshold, 200ms reset timeout, 1.6s/100ms selectable watchdog periods, 1.3V PFI comparator, and operates from -40°C to +85°C (E-suffix). Used in industrial controllers and intelligent instruments requiring reliable µP power monitoring.
For engineers reviewing the MAX695CWE datasheet, MAX695CWE pinout, MAX695CWE application, or MAX695CWE equivalent, key selection criteria include its 16-pin SOIC package, dual reset outputs (RESET and RESET), BATT ON and WDO status signals, CE IN/CE OUT write-protection logic, and compatibility with 5V ±5% supplies in battery-backed memory systems.
Technical Context
The MAX695CWE integrates a precision 4.65V reset voltage detector with 40mV hysteresis, an internal oscillator enabling configurable reset (50ms/200ms) and watchdog (100ms/1.6s) timeouts via OSC SEL and OSC IN pins, and a dedicated 1.3V reference comparator for PFI-based power-fail or low-battery warning. Its battery switchover circuit activates when VCC falls below VBATT − 70mV (rising) or VBATT − 50mV (falling), with 20mV hysteresis.
It implements active-low RESET and active-high RESET outputs, a BATT ON signal indicating VBATT sourcing, a WDO output asserting on watchdog timeout, and CE gating that forces CE OUT high whenever VCC drops below 4.65V - ensuring RAM write protection during brownouts. All logic thresholds are specified across full temperature range (-40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V (min 4.5V, max 4.75V); ensures reliable reset assertion for 5V ±5% supplies |
| Reset Timeout Delay | 200ms (typical); holds µP in reset long enough for clock oscillator startup and firmware initialization |
| Watchdog Timeout | Selectable 100ms or 1.6s; prevents system lockup by forcing reset if software fails to toggle WDI |
| Battery Switchover | VCC-to-VBATT transition at (VCC − VBATT) = 70mV (rise) / 50mV (fall); enables seamless RAM backup without external FET control |
| PFI Comparator Threshold | 1.3V (min 1.2V, max 1.4V); allows precise early power-fail warning before VCC reaches reset threshold |
| Supply Current (Backup) | 1µA max (VBATT = 2.8V, VCC = 0V); extends lithium battery life to >10 years in standby |
| Operating Temp Range | -40°C to +85°C (E-suffix); qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX695CWE is housed in a 16-pin wide-body SOIC (SO-16W) package, 7.5mm × 10.3mm, with 1.27mm pitch. Pin 1 is marked by notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | +5V main supply input; powers all internal circuits and sources VOUT during normal operation |
| 2 | VBATT | Backup battery input (2.0V–4.25V); automatically selected by internal switchover when VCC fails |
| 3 | VOUT | Switched output; delivers higher of VCC or VBATT to RAM; rated for 50mA continuous |
| 4 | GND | Ground reference for all analog/digital functions; must be low-impedance connection |
| 5 | BATT ON | Active-high indicator; sinks 25mA to drive external PNP transistor base during battery backup |
| 6 | LOW LINE | Active-low VCC monitor; asserts immediately on VCC drop below 4.65V, releases instantly on recovery |
| 7 | OSC IN | Oscillator input; accepts external clock (0–250kHz) or capacitor (47pF typical) to adjust timing |
| 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; open-drain, active-low; used to trigger NMI or audible alarm on supply sag |
| 11 | WDI | Watchdog input; three-level (low/mid/high); toggling required within timeout period to prevent reset |
| 12 | CE IN | Chip-enable gate input; buffered to CE OUT only when VCC ≥ 4.65V; otherwise CE OUT forced high |
| 13 | CE OUT | Chip-enable gate output; drives RAM/EEPROM CE/CS/WR; prevents writes during brownout |
| 14 | WDO | Watchdog output; active-low; remains low until next WDI transition after timeout |
| 15 | RESET | Active-low reset output; asserted during power-up, brownout, or watchdog fault; 200ms timeout |
| 16 | RESET | Active-high reset output; inverted complement of RESET; directly drives TTL/CMOS inputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | Simultaneous active-low RESET and active-high RESET eliminate need for external inverters in mixed-logic systems |
| Adjustable Timing | OSC SEL + OSC IN enable user-selectable reset (50ms/200ms) and watchdog (100ms/1.6s) periods without external components |
| Battery Switchover with Hysteresis | 50mV/70mV rising/falling thresholds plus 20mV hysteresis prevent oscillation during slow VCC decay near VBATT |
| RAM Write Protection Logic | CE IN → CE OUT path disabled below 4.65V, forcing CE OUT high to block writes - critical for data integrity during power transients |
| Low-Power Backup Mode | 1µA max quiescent current with VCC = 0V ensures >10-year lithium battery life in always-on memory backup |
| Integrated Power-Fail Detection | 1.3V PFI comparator provides early warning before VCC reaches reset threshold, enabling safe data save routines |
Applications
| Industrial Controller | Automotive Telematics Unit |
|---|---|
Use Scenario: Programmable logic controller (PLC) maintaining real-time clock and configuration EEPROM during mains failure. IC Role / Device Role / Timing Role: MAX695CWE provides battery-backed VOUT, 200ms power-up reset, and CE OUT–gated EEPROM writes to prevent corruption. Use Value: Guarantees deterministic boot sequence and preserves calibration data across 10+ year deployments with no field failures due to brownout-induced writes. |
Use Scenario: In-vehicle infotainment gateway logging GPS coordinates and crash data during ignition cycling and battery voltage sags. IC Role / Device Role / Timing Role: MAX695CWE monitors 12V-to-5V rail, asserts PFO on pre-failure sag, triggers NMI to save last valid position before RESET asserts. Use Value: Enables black-box functionality with <100µs response to VCC droop below 4.65V, meeting ISO 16750-2 transient immunity requirements. |
| Medical Diagnostic Instrument | Smart Energy Meter |
Use Scenario: Portable ultrasound device storing calibration coefficients and patient session history in battery-backed SRAM. IC Role / Device Role / Timing Role: MAX695CWE supplies VOUT from coin cell during AC loss, gates SRAM CE via CE OUT, and asserts RESET on brownout. Use Value: Prevents partial writes to volatile memory during 10ms–500ms line interruptions, satisfying IEC 62304 Class C software safety requirements. |
Use Scenario: Revenue-grade meter retaining time-of-use tariff tables and tamper logs during utility grid instability. IC Role / Device Role / Timing Role: MAX695CWE uses PFI to monitor unregulated DC bus, issues PFO interrupt 20ms before VCC hits 4.65V, allowing flash commit before RESET. Use Value: Achieves ANSI C12.1 compliance for 100ms minimum hold-up time with single 3.6V lithium thionyl chloride cell. |
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; 16-pin PDIP package (longer lead time, higher thermal resistance) | Suitable for prototyping or through-hole production; not recommended for high-density PCBs | Select MAX695CPE+ only if SOIC assembly infrastructure is unavailable or for hand-soldered evaluation. |
| TPS3823MPW | Single 4.63V reset threshold, fixed 200ms timeout, no watchdog, no CE gating, no battery switchover | Limited to basic reset supervision; cannot replace MAX695CWE in RAM backup or watchdog-critical systems | Use TPS3823MPW only in cost-sensitive applications where battery backup, watchdog, and write protection are omitted. |
Compared with MAX695CWE, MAX695CPE+ offers identical functionality in through-hole form but lacks SOIC's thermal and density advantages; TPS3823MPW reduces cost and complexity but sacrifices battery management, watchdog, and CE protection - making it unsuitable as a drop-in replacement.
Availability
MAX695CWE is available at Aetrix Electronics and suitable for industrial controllers, automotive telematics units, medical diagnostic instruments, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
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) is a semiconductor company specializing in high-performance 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, designed specifically to consolidate reset, watchdog, battery switchover, power-fail detection, and RAM write protection into a single 16-pin IC for mission-critical embedded systems.
FAQ
What is the reset timeout delay of the MAX695CWE?
The MAX695CWE has a nominal reset timeout delay of 200ms after VCC rises above the 4.65V threshold. This extended delay ensures sufficient time for microprocessor clock oscillators to stabilize and firmware to initialize before release from reset. The timeout is factory-trimmed and guaranteed over the full -40°C to +85°C operating range. Unlike the 8-pin MAX690 variants, the MAX695CWE does not offer a 50ms option - its 200ms delay is fixed and optimized for robust system boot sequencing.
Does the MAX695CWE support battery backup for CMOS RAM?
Yes, the MAX695CWE supports battery backup for CMOS RAM via its integrated switchover circuit. When VCC drops below VBATT minus 50mV (falling) or 70mV (rising), the device automatically connects VBATT to VOUT, delivering up to 50mA to the RAM. It also provides the BATT ON signal to drive an external PNP transistor for higher current loads. The MAX695CWE draws only 1µA in battery backup mode, enabling multi-year operation from a standard 3V lithium coin cell - a core capability confirmed in the device's Electrical Characteristics table and Typical Applications section.
How does the CE IN/CE OUT write protection work on the MAX695CWE?
The MAX695CWE implements hardware-enforced RAM write protection using CE IN and CE OUT. When VCC is above 4.65V, CE OUT replicates CE IN with ~50ns propagation delay. If VCC falls below 4.65V - during power-up, brownout, or shutdown - CE OUT is forced high regardless of CE IN state, disabling RAM writes. This prevents corrupted data entry during unstable supply conditions. The feature is explicitly documented in the Pin Description and Detailed Description sections, and is a distinguishing function absent in the 8-pin MAX690 family members.
Can the watchdog timeout period of the MAX695CWE be adjusted?
Yes, the MAX695CWE 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 or high. A low OSC IN selects 100ms; a high or floating OSC IN selects 1.6s. The device also supports external clock or capacitor-based timing via OSC SEL = low. These configurations are fully detailed in Table 1 and Figure 8 of the datasheet, and are unique to the 16-pin MAX691/MAX693/MAX695 series - the 8-pin variants have fixed 1.6s timeout.
What is the purpose of the PFI and PFO pins on the MAX695CWE?
The PFI (Power-Fail Input) and PFO (Power-Fail Output) pins implement an early-warning power-fail detection system. PFI is compared to an internal 1.3V reference; when the voltage at PFI falls below 1.3V - typically set by an external resistor divider monitoring VCC - PFO goes low to assert a non-maskable interrupt (NMI) to the microprocessor. This gives the system several milliseconds to save critical data before VCC drops to the 4.65V reset threshold. The PFO comparator is disabled when VCC < VBATT, conserving battery current during backup operation - a behavior verified in the Electrical Characteristics and Detailed Description sections.
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:
- Obsolete
- 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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