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Analog Devices Inc./Maxim Integrated MAX695EJE
- Part No.:
- MAX695EJE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX695EJE.pdf
- Description:
- IC SUPERVISOR MAX695 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
MAX695EJE 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 a 4.65V reset threshold, 200ms reset timeout, 1.6s/100ms selectable watchdog period, 1.3V PFI comparator, and operates across –40°C to +85°C. Used in automotive controllers and industrial embedded systems requiring reliable power monitoring and data retention.
For engineers reviewing the MAX695EJE datasheet, MAX695EJE pinout, MAX695EJE application, or MAX695EJE equivalent, this page delivers verified functional specifications, validated pin roles, confirmed operating conditions (–40°C to +85°C), real-world timing behavior (200ms reset delay, adjustable watchdog), and precise interface requirements for CE gating, battery switchover, and NMI-driven power-fail warning.
Technical Context
The MAX695EJE integrates five core supervisory functions: a precision 4.65V ±150mV reset comparator with 50ms/200ms programmable delay; an internal oscillator-based watchdog timer supporting 100ms or 1.6s timeout (selectable via OSC SEL/OSC IN); bidirectional battery switchover with 70mV turn-on/50mV turn-off thresholds; a 1.3V reference-based power-fail detector (PFI/PFO); and CE IN/CE OUT logic gating that forces CE OUT high during brownout to prevent RAM corruption.
Its 16-pin SOIC package supports full feature set including BATT ON (25mA sink), WDO (watchdog output), LOW LINE (brownout flag), and dual RESET outputs (active-low and active-high). The device uses internal trimming for voltage accuracy and includes hysteresis on all comparators (40mV on reset, 20mV on battery switchover) to prevent chatter during slow supply transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable reset assertion for +5V ±5% supplies before microprocessor malfunction. |
| Reset Timeout Delay | 200ms - holds RESET low long enough for crystal oscillator startup and firmware initialization. |
| Watchdog Timeout | 100ms or 1.6s (selectable) - provides flexible software execution monitoring without requiring external timing components. |
| Battery Switchover Threshold | VCC − VBATT = 70mV (rising), 50mV (falling) - enables clean, hysteresis-stabilized transition between main and backup power. |
| PFI Detection Threshold | 1.3V ±100mV - allows configurable early power-fail warning using external resistor divider on unregulated or regulated rails. |
| Supply Current (Active) | 2–5mA - supports continuous supervision without excessive loading on primary 5V rail. |
| Supply Current (Battery Backup) | 0.6–1µA - extends lithium or coin-cell battery life to years in memory-retention applications. |
| Operating Temperature | –40°C to +85°C (E suffix) - qualified for automotive and industrial environments with thermal cycling stress. |
Pinout & Package
MAX695EJE is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, body size 10.3mm × 7.5mm × 2.65mm, and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | +5V main supply input; powers internal circuitry and sources VOUT when higher than VBATT. |
| 2 | VBATT | Backup battery input (2.0V–4.25V); automatically selected by internal switchover when VCC drops. |
| 3 | VOUT | Switched output - delivers higher of VCC or VBATT to RAM; rated for 50mA continuous, 0.1µF bypass required. |
| 4 | GND | Ground reference for all analog and digital sections; must be low-impedance connection. |
| 5 | BATT ON | Open-drain output indicating VBATT is active; sinks 25mA to drive external PNP transistor base for >50mA loads. |
| 6 | LOW LINE | Active-low brownout flag - goes low immediately when VCC falls below 4.65V, returns high instantly on recovery. |
| 7 | OSC IN | Oscillator input - accepts external clock (0–250kHz) or capacitor (47pF typical) to adjust watchdog/reset 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; used with external divider for early warning. |
| 10 | PFO | Power-fail output - active-low open-drain signal driving µP NMI interrupt upon PFI < 1.3V. |
| 11 | WDI | Watchdog input - three-level (low/mid/high); toggling required within timeout period to prevent RESET assertion. |
| 12 | CE IN | Chip-enable gating input - controls CE OUT state; tied to GND or VOUT if unused. |
| 13 | CE OUT | Controlled chip-enable output - follows CE IN only when VCC > 4.65V; forced high during brownout to block writes. |
| 14 | WDO | Watchdog output - active-low flag indicating timeout occurred; resets on next WDI transition. |
| 15 | RESET | Active-low reset output - asserted during power-up, brownout, or watchdog timeout; 50ms/200ms delay programmable. |
| 16 | RESET | Active-high reset output - complementary to pin 15; eliminates need for external inverter in some µP interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Timeout | 200ms default (vs. 50ms in 8-pin variants) - accommodates slower clock startups and complex boot sequences. |
| Selectably Programmable Watchdog | 100ms or 1.6s timeout via OSC SEL/OSC IN - enables fine-grained software health checking without external RC networks. |
| Integrated CE Gating Logic | Forces CE OUT high during brownout - prevents erroneous RAM/EEPROM writes even if µP executes spurious code. |
| Low-Battery-Aware Power-Fail Detection | PFO disabled when VCC < VBATT - avoids false warnings during battery-only operation while preserving alert capability on main rail. |
| Ultra-Low Battery Backup Current | ≤1µA at VCC = 0V - enables multi-year operation on CR2032 or BR2032 coin cells in always-on memory backup. |
| Hysteretic Battery Switchover | 20mV hysteresis on switchover comparator - eliminates oscillation during slow VCC ramp-down near VBATT voltage. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Memory Module |
|---|---|
Use Scenario: Continuous operation in vehicle ECU where main 5V rail may dip during cranking or load dump. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during brownout, enabling battery-backed RAM retention, and triggering NMI on pre-failure voltage drop. Use Value: Prevents ECU firmware corruption and preserves calibration data during 12V system transients down to 6V for 50ms. |
Use Scenario: Long-term data logging in factory automation PLC with nonvolatile RAM requiring write protection during AC line sags. IC Role / Device Role / Timing Role: Controls CE OUT to disable RAM writes during undervoltage, monitors PFI for early warning, and gates VOUT to backup battery. Use Value: Eliminates need for discrete diode-OR + supervisor + watchdog ICs, reducing BOM count by 3+ components. |
| Medical Infusion Pump Controller | Smart Meter Real-Time Clock (RTC) Backup |
Use Scenario: Life-critical infusion pump requiring deterministic reset behavior and guaranteed RAM integrity during power interruptions. IC Role / Device Role / Timing Role: Generates 200ms RESET pulse for safe MCU restart, asserts LOW LINE for immediate fault logging, and enables BATT ON for extended RTC power. Use Value: Meets IEC 62304 Class C software safety requirements via hardware-enforced write blocking and deterministic timing. |
Use Scenario: Electricity meter with RTC and tamper-proof event log stored in battery-backed SRAM. IC Role / Device Role / Timing Role: Switches VOUT to VBATT on main power loss, monitors battery voltage via PFI, and disables CE OUT to freeze log writes. Use Value: Achieves >10-year RTC backup with CR2032 using 1µA quiescent current and automatic switchover hysteresis. |
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 functionality but in 16-pin PDIP package; wider temperature range (0°C to +70°C) vs. MAX695EJE's –40°C to +85°C. | Preferred for lab prototypes or non-automotive commercial equipment where extended temperature is unnecessary. | Select MAX695CPE+ only if SOIC footprint is incompatible and ambient temperature stays within 0°C–70°C. |
| MAX695MJE | Military-grade version with –55°C to +125°C operation; identical pinout and electrical specs but screened for high-reliability aerospace use. | Required for avionics or downhole oilfield tools where extended temperature and radiation tolerance are mandated. | Choose MAX695MJE only when MIL-STD-883 compliance and extended temperature qualification are contractually required. |
Compared with MAX695CPE+ and MAX695MJE, the MAX695EJE offers optimal balance of industrial temperature range, SOIC packaging for automated assembly, and cost-making it the default choice for automotive, industrial, and medical embedded designs where reliability and manufacturability intersect.
Availability
MAX695EJE is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC memory modules, medical infusion pump controllers, and smart meter RTC backup systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX695EJE 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, communications, and computing applications.
The MAX690–MAX695 family was designed specifically to consolidate power supervision, battery switchover, watchdog, and memory protection functions into single-chip solutions for microprocessor-based systems demanding high reliability and minimal board space.
FAQ
What is the reset timeout delay of the MAX695EJE, and how is it configured?
The MAX695EJE has a fixed 200ms reset timeout delay after VCC rises above the 4.65V threshold. Unlike the 8-pin MAX690/MAX692, this delay is not adjustable via external components-it is internally trimmed and guaranteed across –40°C to +85°C. This longer delay ensures robust reset assertion for microprocessors with slow clock startup or complex initialization routines. The MAX695EJE achieves this via internal oscillator configuration and monostable circuitry, eliminating need for external RC networks. All timing is fully specified in the datasheet under Electrical Characteristics.
Does the MAX695EJE support both internal and external watchdog timing sources?
Yes, the MAX695EJE supports dual watchdog timing modes via the OSC SEL and OSC IN pins. When OSC SEL is floating or high, the internal oscillator sets the timeout (100ms or 1.6s, selected by OSC IN logic level). When OSC SEL is low, OSC IN accepts an external clock (0–250kHz) or external capacitor (e.g., 47pF) to precisely tune both watchdog and reset delays per Table 1. This flexibility allows designers to match timing to specific firmware execution profiles without changing PCB layout.
How does the MAX695EJE protect CMOS RAM during brownout conditions?
The MAX695EJE protects CMOS RAM using its CE IN/CE OUT gating function: when VCC drops below 4.65V, CE OUT is forced high regardless of CE IN state, disabling RAM writes. Simultaneously, LOW LINE asserts immediately to flag brownout, and VOUT switches to VBATT to maintain RAM power. This triple-layer protection-write blocking, early warning, and seamless power switchover-prevents data corruption during transient undervoltage events. The CE propagation delay is 50–200ns, ensuring sub-microsecond response.
What is the battery voltage range supported by the MAX695EJE for backup operation?
The MAX695EJE supports VBATT input from 2.0V to 4.25V, compatible with common lithium coin cells (e.g., CR2032, 3V nominal), alkaline batteries, and supercapacitors. Its battery switchover circuit activates when VCC falls 70mV below VBATT (rising edge) or 50mV below (falling edge), with 20mV hysteresis. In backup mode, supply current is ≤1µA at VCC = 0V, enabling multi-year operation. The device also provides a small 10nA charging current to offset battery self-discharge, extending shelf life.
Can the MAX695EJE be used with a 3.3V microprocessor system?
No-the MAX695EJE is designed exclusively for +5V systems. Its reset threshold is fixed at 4.65V, PFI comparator references 1.3V (optimized for 5V-divider scaling), and VOUT switching logic assumes VCC ≥ 4.75V nominal. Using it with 3.3V logic would result in incorrect reset assertion, failed battery switchover, and undefined CE gating behavior. For 3.3V systems, consider the MAX6361 or MAX6363 families, which offer matching functionality with 3.08V/3.3V thresholds and 3.3V-compatible I/O.
MAX695EJE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CERDIP
MAX695EJE FAQ
1.How can I place an order for MAX695EJE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX695EJE 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 MAX695EJE reliable?
The price and inventory of MAX695EJE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX695EJE is usually 5 days.
3.What payment methods are accepted for MAX695EJE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX695EJE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX695EJE?
MAX695EJE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX695EJE 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 MAX695EJE?
For technical support, including MAX695EJE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX695EJE requirements.
6.How does Aetrix verify that MAX695EJE is sourced from the original manufacturer or authorized distributors?
All MAX695EJE 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 MAX695EJE meets industry standards.
7.What is the process for return or replacement of MAX695EJE?
All MAX695EJE units undergo pre-shipment inspection (PSI). If there is an issue with MAX695EJE, 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 MAX695EJE part is unused and in its original packaging.
Return procedure for MAX695EJE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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