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Analog Devices Inc./Maxim Integrated MAX695C/D
- Part No.:
- MAX695C/D
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- Die
- Datasheet:
-
MAX695C/D.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL DICE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX695C/D 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, 1.3V PFI comparator, and VOUT switching between VCC and VBATT. Used in industrial controllers and automotive ECUs requiring reliable power monitoring and data retention.
For engineers reviewing the MAX695C/D datasheet, MAX695C/D pinout, MAX695C/D application, or MAX695C/D equivalent, key selection considerations include its 16-pin SOIC/N package, dual reset outputs (RESET and RESET), BATT ON and WDO status signals, CE IN/CE OUT write-protection logic, and compatibility with 2.0–4.25V backup batteries and 4.75–5.5V main supplies.
Technical Context
The MAX695C/D integrates five core supervisory functions: a precision 4.65V ±150mV reset voltage detector with 50ms minimum pulse width (200ms typical), an adjustable watchdog timer using internal oscillator or external clock/capacitor, a bidirectional battery switchover circuit with 70mV turn-on/50mV turn-off thresholds, a 1.3V reference-based power-fail comparator (PFI/PFO), and active-high CE gating logic that forces CE OUT high during brownout to prevent erroneous RAM writes.
Its dual reset outputs (active-low RESET and active-high RESET) support direct connection to both standard and inverted microprocessor reset inputs. The BATT ON output sinks 25mA to drive external PNP transistors for high-current backup, while the WDO signal provides independent watchdog fault indication-both enabled only in the 16-pin variants like MAX695C/D, not the 8-pin MAX690 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable reset assertion for +5V ±5% supplies before microprocessor operation becomes unstable. |
| Reset Timeout Delay | 200ms - holds reset active long enough for crystal oscillators and firmware initialization after power-up or brownout recovery. |
| Watchdog Timeout | 1.6s (long) or 100ms (short) - configurable via OSC SEL/OSC IN to match software execution cycles without false triggers. |
| Battery Switchover | VCC-to-VBATT transition at 70mV rise / 50mV fall - hysteresis prevents chatter during slow supply decay near switchover point. |
| PFI Comparator Threshold | 1.3V ±100mV - enables accurate early power-fail warning by scaling system supply with external resistive divider. |
| VOUT Output Current | 50mA from VCC, 250µA from VBATT - sufficient to power typical CMOS RAM and RTC during main supply loss. |
| Supply Current (Backup) | 1µA max - extends lithium or coin-cell battery life to >10 years in always-on memory backup applications. |
Pinout & Package
MAX695C/D is supplied in 16-pin packages: plastic DIP (C suffix), wide SOIC (D suffix), and CERDIP (M suffix). All variants share identical pinout and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main +5V supply input; powers internal circuitry and sources VOUT when higher than VBATT. |
| 2 | VBATT | Backup battery input; connected to coin cell or supercapacitor; switchover occurs when VCC drops below VBATT −50mV. |
| 3 | VOUT | Switched output delivering higher of VCC or VBATT; powers CMOS RAM and real-time clock during main supply loss. |
| 4 | GND | Ground reference for all analog and digital functions; must be low-impedance connection to minimize noise on reset timing. |
| 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 microprocessor NMI line to initiate data save before VCC falls below reset threshold. |
| 7 | WDI | Three-level watchdog input; toggling required every 100ms or 1.6s; floating disables watchdog function. |
| 8 | OSC SEL | Oscillator select; floating or high enables internal oscillator; low enables external clock or capacitor timing on OSC IN. |
| 9 | OSC IN | Timing input; accepts external clock (0–250kHz) or 47pF capacitor to adjust watchdog and reset timeout periods. |
| 10 | CE IN | Chip-enable gate input; connects to microprocessor CE/WR line; CE OUT follows CE IN only when VCC ≥ 4.65V. |
| 11 | CE OUT | Controlled chip-enable output; forced high during brownout to block RAM writes regardless of CE IN state. |
| 12 | BATT ON | Active-low battery-active indicator; sinks 25mA to drive base of external PNP transistor for high-current backup. |
| 13 | LOW LINE | Active-low VCC monitor; goes low immediately when VCC falls below 4.65V and returns high as soon as VCC recovers. |
| 14 | WDO | Watchdog fault output; goes low on timeout and remains low until next WDI transition - provides independent fault signaling. |
| 15 | RESET | Active-low reset output; asserted during power-up, brownout, or watchdog timeout; 200ms pulse width ensures full MCU reset. |
| 16 | RESET | Active-high reset output; inverse of RESET pin; eliminates need for external inverter in systems requiring high-true reset. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | Simultaneous active-low RESET and active-high RESET eliminate external inverters and support mixed-logic systems. |
| Adjustable Watchdog Timing | Configurable 100ms/1.6s timeout via OSC SEL/OSC IN enables precise alignment with software loop timing and boot sequences. |
| CE Gating with Brownout Lockout | CE OUT forced high when VCC < 4.65V prevents accidental RAM writes during power instability - critical for data integrity. |
| Low-Power Battery Backup Mode | 1µA max quiescent current extends CR2032 battery life beyond 10 years while maintaining CMOS RAM contents. |
| Integrated Power-Fail Warning | 1.3V PFI comparator with PFO output enables early NMI-triggered data save before VCC crosses reset threshold. |
Applications
| Industrial Controller Monitoring | Automotive ECU Power Supervision |
|---|---|
Use Scenario: PLC or motion controller operating in factory environments with fluctuating 24VDC-derived 5V rails and extended temperature cycling. IC Role / Device Role / Timing Role: MAX695C/D monitors VCC, asserts RESET on brownout, switches to VBATT for RTC/parameter storage, and triggers PFO-driven NMI for last-chance EEPROM save. Use Value: Prevents corrupted configuration data during line sags and ensures deterministic restart after power interruption - meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Engine control unit powered from vehicle battery (9–16V) with 5V LDO, subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: MAX695C/D provides 200ms reset hold time for MCU startup, detects battery voltage sag via PFI, and gates CE to protect flash programming registers during undervoltage. Use Value: Eliminates spurious reboots during cranking and guarantees safe shutdown sequence before VCC collapses below 4.65V. |
| Medical Instrument Data Retention | Smart Meter Real-Time Clock Backup |
Use Scenario: Portable diagnostic device with lithium coin-cell backup and volatile SRAM storing calibration coefficients and usage logs. IC Role / Device Role / Timing Role: MAX695C/D switches VOUT to VBATT on AC loss, asserts RESET to halt measurement acquisition, and uses CE OUT to disable RAM writes during transition. Use Value: Guarantees zero data loss during power switchover with <1µA standby draw - enabling 10+ year battery life per IEC 62304 Class B requirements. |
Use Scenario: Electricity meter with tamper-resistant RTC and nonvolatile event logging, operating from mains or backup capacitor. IC Role / Device Role / Timing Role: MAX695C/D monitors regulated 5V rail, triggers PFO interrupt on grid failure, initiates secure time-stamped log entry, then switches VOUT to backup source. Use Value: Meets ANSI C12.1 and IEC 62053-21 accuracy requirements by ensuring RTC continuity and event timestamp validity during power transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX695E/D | Same functionality and pinout; E suffix rated for -40°C to +85°C vs. C suffix (0°C to +70°C); identical electrical specs. | Required for extended-temperature industrial or automotive under-hood use; C suffix insufficient for full automotive ambient range. | Select MAX695E/D when operating ambient exceeds 70°C or requires AEC-Q100 qualification support. |
| MAX695M/D | Same functionality and pinout; M suffix rated for -55°C to +125°C; higher temp grade with derated power dissipation (600mW). | Suitable for military, aerospace, or high-reliability embedded systems where extended thermal survival is mandatory. | Choose MAX695M/D only when full MIL-STD-883 or DO-160 compliance is required; otherwise MAX695C/D or MAX695E/D preferred. |
Compared with MAX695C/D, the MAX695E/D offers identical supervision features with extended temperature range for harsher environments, while MAX695M/D adds extreme-temperature capability at higher cost and derated power handling - making MAX695C/D optimal for commercial-grade industrial controllers and medical devices operating within 0°C–70°C.
Availability
MAX695C/D is available at Aetrix Electronics and suitable for industrial controllers, automotive ECUs, medical instruments, and smart meters requiring stable component supply across multi-year production cycles and lifecycle management.
Supply support for MAX695C/D 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 power management, sensing, and interface applications in industrial, automotive, and communications systems.
The MAX695C/D belongs to the MAX690–MAX695 supervisory family, engineered specifically for robust microprocessor power monitoring, battery-backed memory protection, and deterministic reset sequencing in mission-critical embedded systems.
FAQ
What is the reset timeout delay of the MAX695C/D?
The MAX695C/D provides a fixed 200ms reset timeout delay after VCC rises above the 4.65V threshold. This duration ensures sufficient hold time for microprocessor clock stabilization and firmware initialization before release from reset. Unlike the 8-pin MAX690 series, the MAX695C/D does not support adjustable reset delay via external components - the 200ms value is guaranteed across temperature and supply voltage for consistent system behavior.
Does the MAX695C/D support battery backup switchover?
Yes, the MAX695C/D supports automatic battery backup switchover between VCC and VBATT. When VCC drops below VBATT minus 50mV, the internal switch connects VBATT to VOUT, sustaining power to CMOS RAM and RTC. The switchover comparator includes 20mV hysteresis to prevent oscillation near the threshold. VOUT delivers up to 250µA from VBATT with only 1µA quiescent current, enabling multi-year operation on coin cells.
Can the MAX695C/D be used with a 3.3V microprocessor system?
No, the MAX695C/D is designed for 5V systems: its reset threshold is fixed at 4.65V, VCC operating range is 4.75V–5.5V, and all logic thresholds scale to 5V. It cannot reliably supervise 3.3V microprocessors. For 3.3V applications, consider the MAX6361 or MAX6363 families, which offer 3.08V or 3.3V reset thresholds and compatible feature sets - the MAX695C/D is strictly a +5V supervisory solution.
How does the CE gating function work on the MAX695C/D?
The MAX695C/D uses CE IN and CE OUT pins to prevent erroneous writes to CMOS RAM during power instability. When VCC ≥ 4.65V, CE OUT replicates CE IN with ~50ns delay. If VCC falls below 4.65V, CE OUT is forced high regardless of CE IN state - disabling RAM writes. This hardware-enforced lockout ensures data integrity during power-up, brownout, or shutdown, eliminating reliance on software-controlled write protection.
What is the purpose of the BATT ON pin on the MAX695C/D?
The BATT ON pin on the MAX695C/D is an active-low open-drain output that indicates when VOUT is sourced from VBATT. It sinks up to 25mA and is intended to drive the base of an external PNP transistor, enabling high-current backup for RAM or peripherals exceeding the 50mA VOUT limit. BATT ON goes low during battery switchover and high when VCC is active - providing a direct hardware signal for system status monitoring and auxiliary power control.
MAX695C/D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Bulk
- 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:
- Dice
MAX695C/D FAQ
1.How can I place an order for MAX695C/D through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX695C/D 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 MAX695C/D reliable?
The price and inventory of MAX695C/D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX695C/D is usually 5 days.
3.What payment methods are accepted for MAX695C/D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX695C/D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX695C/D?
MAX695C/D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX695C/D 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 MAX695C/D?
For technical support, including MAX695C/D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX695C/D requirements.
6.How does Aetrix verify that MAX695C/D is sourced from the original manufacturer or authorized distributors?
All MAX695C/D 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 MAX695C/D meets industry standards.
7.What is the process for return or replacement of MAX695C/D?
All MAX695C/D units undergo pre-shipment inspection (PSI). If there is an issue with MAX695C/D, 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 MAX695C/D part is unused and in its original packaging.
Return procedure for MAX695C/D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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