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Analog Devices Inc./Maxim Integrated MAX697EJE
- Part No.:
- MAX697EJE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX697EJE.pdf
- Description:
- IC SUPERVISOR MAX697 MPU
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
MAX697EJE from Maxim Integrated is a microprocessor supervisory circuit designed for critical power monitoring and CMOS RAM write protection in industrial and embedded systems. It provides adjustable low-line reset (1.25V–1.35V), watchdog timeout (100ms/1.6s), 50ms reset pulse width, 1.3V power-fail detection, and CE IN/CE OUT gating - all while consuming ≤300µA supply current over –40°C to +85°C.
For engineers reviewing the MAX697EJE datasheet, MAX697EJE pinout, MAX697EJE application, or MAX697EJE equivalent, key selection considerations include its lack of battery-backup switching (vs. MAX696), guaranteed CE gating functionality, low-quiescent-current operation in extended temperature range, and CERDIP package suitability for high-reliability environments.
Technical Context
The MAX697EJE implements a precision 1.3V reference-based comparator architecture for LLIN and PFI inputs, with independent output drivers for RESET (active-low), RESET (active-high), WDO, LOW LINE, and PFO. Its watchdog timer uses either an internal 10.24kHz oscillator (selected via OSC SEL) or external clock/capacitor timing, with dual timeout modes and post-reset delay extension.
Unlike the MAX696, the MAX697EJE omits VBATT, VOUT, and BATT ON pins but adds CE IN and CE OUT for hardware-enforced RAM write protection - asserting CE OUT high when LLIN falls below threshold or during power failure, ensuring data integrity without software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 3.0V to 5.5V on VCC - supports standard 3.3V/5V µP rails without level-shifting. |
| Supply Current (max) | 300µA at full temperature range - enables long-life battery-backed operation in always-on systems. |
| Low-Line Threshold | 1.25V to 1.35V - precise detection of brownout conditions with 12mV hysteresis for noise immunity. |
| Reset Timeout Delay | 35ms to 70ms default - configurable via capacitor or OSC IN to meet µP oscillator startup timing requirements. |
| Watchdog Timeout | 100ms or 1.6s (selectable) - provides fail-safe recovery from firmware hangs with minimal false triggers. |
| PFI Threshold | 1.2V to 1.4V - allows early power-fail warning before reset assertion, enabling safe data save routines. |
| CE Propagation Delay | 80ns to 150ns - ensures tight timing alignment between voltage fault detection and RAM write disable. |
Pinout & Package
MAX697EJE is housed in a 16-pin CERDIP (Ceramic Dual In-line Package), rated for –40°C to +85°C operation, with hermetic sealing suitable for harsh or high-reliability applications including aerospace, industrial control, and medical instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VBATT | Not connected (NC) - MAX697 lacks battery-backup function; pin must be left open or grounded per layout guidelines. |
| 2 | VOUT | Not connected (NC) - unused in MAX697; pin must be left open or grounded. |
| 3 | VCC | Main supply input - powers all internal circuits; bypass with ≥0.1µF ceramic capacitor to GND. |
| 4 | GND | Ground reference - common return path for all analog and digital sections; requires low-impedance connection. |
| 5 | N.C. | No connection - pin 5 is unassigned and must remain floating (not tied to any net). |
| 6 | LOW LINE | Open-drain fault indicator - active-low signal reflecting LLIN comparator output; used for system status or interrupt generation. |
| 7 | OSC IN | Timing control input - accepts external clock or capacitor to set reset/watchdog timing; internal pullup disabled when OSC SEL = high. |
| 8 | OSC SEL | Oscillator mode selector - high/floating enables internal oscillator; low enables external timing source. |
| 9 | PFI | Power-fail input - noninverting input to 1.3V comparator; monitors external voltage divider for pre-reset warning. |
| 10 | PFO | Power-fail output - active-low open-drain signal asserted when PFI < 1.3V; typically drives µP NMI or interrupt line. |
| 11 | WDI | Watchdog input - three-level interface (low/mid/high); toggling required within timeout period to prevent reset assertion. |
| 12 | CE OUT | Chip-enable gate output - buffered, inverted replica of CE IN when LLIN > 1.3V; forced high during undervoltage for write protection. |
| 13 | CE IN | Chip-enable gate input - connects to µP or logic CE/WR signal; internally pulled up (3µA) when not driven. |
| 14 | WDO | Watchdog output - active-low open-drain flag indicating watchdog timeout; resets only on WDI transition while RESET is high. |
| 15 | RESET | Active-low reset output - synchronous 50ms pulse on LLIN fault or watchdog timeout; drives µP RESET directly. |
| 16 | RESET | Active-high reset output - complementary to RESET; eliminates need for external inverter in active-high reset architectures. |
Key Features
| Feature | Design Value |
|---|---|
| On-board CE gating logic | Hardware-enforced RAM write disable during brownout - no firmware dependency, sub-150ns propagation ensures data integrity. |
| Adjustable watchdog timeout | Selectable 100ms or 1.6s periods via OSC SEL/OSC IN - balances responsiveness vs. false-trigger immunity across application profiles. |
| Dual reset outputs | Simultaneous active-low (RESET) and active-high (RESET) signals - eliminates external inverters and simplifies interface to diverse µP families. |
| Separate 1.3V power-fail detector | Independent PFI/PFO path with ±50mV threshold tolerance - enables early warning before main reset, supporting graceful shutdown sequences. |
| Low-temperature CERDIP packaging | Hermetic 16-pin ceramic DIP rated –40°C to +85°C - delivers long-term reliability in thermally cycling or high-humidity environments. |
Applications
| Industrial Programmable Logic Controllers (PLCs) | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Continuous operation in factory-floor PLCs where power transients and brownouts risk corrupted I/O state or configuration memory. IC Role / Device Role / Timing Role: MAX697EJE monitors VCC, asserts RESET on undervoltage, disables RAM writes via CE OUT, and triggers PFO-based NMI for last-chance data logging. Use Value: Prevents invalid register writes during unstable supply, ensuring deterministic restart behavior and preserving calibration data across power cycles. |
Use Scenario: Battery-backed memory retention in portable ultrasound or ECG devices requiring guaranteed data integrity during AC power loss or battery swap. IC Role / Device Role / Timing Role: MAX697EJE gates CE to SRAM/EEPROM using CE IN/CE OUT, detects early power decay via PFI, and holds RESET until stable VCC resumes. Use Value: Eliminates risk of partial writes corrupting patient waveform buffers or device configuration, meeting IEC 62304 safety-critical data retention requirements. |
| Aerospace Avionics Data Recorders | Energy Metering Gateways |
Use Scenario: Harsh-environment flight data recorders exposed to wide thermal swings and EMI, where component failure must be avoided at all costs. IC Role / Device Role / Timing Role: MAX697EJE operates in CERDIP package, supervises 5V rail, uses watchdog to detect frozen firmware, and forces CE OUT high during voltage sag to lock memory. Use Value: Hermetic packaging plus hardware write protection ensures nonvolatile memory remains intact across shock, vibration, and extreme temperature excursions. |
Use Scenario: Smart electricity meters deployed in utility substations with unstable grid voltage and frequent surges/brownouts. IC Role / Device Role / Timing Role: MAX697EJE monitors both regulated 3.3V logic rail and unregulated DC bus via PFI, generates early PFO warning, and asserts RESET only after sustained undervoltage. Use Value: Enables meter firmware to store cumulative kWh readings to backup memory before main reset, preventing billing data loss during grid disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX696EJE | Includes VBATT/VOUT/BATT ON for battery-backup switching; higher quiescent current (≤4mA in VCC mode); lacks CE IN/CE OUT. | Suitable where RAM backup power switching is required; unsuitable where write-protection gating is mandatory. | Select MAX696EJE only if battery switchover is needed and CE gating is unnecessary; MAX697EJE is not pin-compatible due to differing pin functions. |
| TPS3823-50DBVR | Single-supply 5V supervisor with fixed 4.63V reset threshold; no watchdog, no PFI, no CE gating; SOT-23-5 package. | Limited to basic reset-only applications; cannot replace MAX697EJE's multi-function supervision or RAM protection capability. | Use TPS3823-50DBVR only for cost-sensitive, space-constrained designs requiring only power-on reset - not a functional substitute for MAX697EJE. |
Compared with MAX696EJE, the MAX697EJE trades battery switching for hardware CE gating and lower current draw; compared with TPS3823-50DBVR, it offers comprehensive supervision with watchdog, PFI, and write protection - making it uniquely suited for data-critical µP systems requiring layered fault response.
Availability
MAX697EJE is available at Aetrix Electronics and suitable for industrial programmable logic controllers, medical diagnostic equipment, aerospace avionics data recorders, and energy metering gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX697EJE 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 markets.
The MAX697EJE belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust, multi-function power monitoring and memory protection in mission-critical embedded systems operating under wide temperature and voltage stress.
FAQ
What is the primary function of the MAX697EJE in a microprocessor system?
The MAX697EJE serves as a multi-function supervisory circuit that monitors VCC for brownout conditions, provides a configurable reset signal, implements a watchdog timer to detect firmware hangs, delivers early power-fail warning via PFI/PFO, and enforces hardware write protection on CMOS RAM through CE IN/CE OUT gating - all in a single 16-pin CERDIP package. Its design ensures reliable operation of the MAX697EJE in demanding environments where data integrity and deterministic restart behavior are essential.
Does the MAX697EJE support battery-backup power switching like the MAX696?
No, the MAX697EJE does not support battery-backup power switching. Unlike the MAX696, it omits VBATT, VOUT, and BATT ON pins entirely. Instead, the MAX697EJE dedicates those pins to CE IN and CE OUT for hardware-enforced RAM write protection. This architectural trade-off reduces quiescent current to ≤300µA and enables deterministic memory safeguarding - a core differentiator of the MAX697EJE in data-critical applications.
How is the watchdog timeout period configured on the MAX697EJE?
The MAX697EJE watchdog timeout is selected using the OSC SEL and OSC IN pins: when OSC SEL is high or floating, the internal oscillator sets the timeout to either 100ms (OSC IN low) or 1.6s (OSC IN floating). When OSC SEL is low, external timing via clock signal or capacitor on OSC IN determines the timeout. All configurations apply to the MAX697EJE without requiring external components beyond those specified in the timing tables - ensuring flexibility across diverse firmware architectures.
What is the role of CE IN and CE OUT in the MAX697EJE, and how do they interact with LLIN?
CE IN accepts the system's chip-enable or write signal, while CE OUT delivers a gated version: it replicates CE IN only when LLIN > 1.3V; otherwise, it forces a logic-high state to disable writes during undervoltage. This behavior is intrinsic to the MAX697EJE's design and occurs independently of software control - guaranteeing that RAM remains read-only whenever supply voltage drops below the safe operating threshold, thereby protecting stored data even during power collapse events affecting the MAX697EJE.
Is the MAX697EJE pin-compatible with other members of the MAX696/MAX697 family?
No, the MAX697EJE is not pin-compatible with the MAX696 series due to fundamental pin function differences: pins 1 (VBATT), 2 (VOUT), and 5 (N.C. on MAX697EJE vs. BATT ON on MAX696) serve distinct roles, and pins 12–13 are assigned to CE OUT/CE IN on MAX697EJE but are unused or differently allocated on MAX696 variants. Layout reuse is not possible without redesign; the MAX697EJE requires its own dedicated footprint reflecting its unique CE gating functionality and absence of battery-switching circuitry.
MAX697EJE 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:
- Adjustable/Selectable
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CERDIP
MAX697EJE FAQ
1.How can I place an order for MAX697EJE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX697EJE 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 MAX697EJE reliable?
The price and inventory of MAX697EJE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX697EJE is usually 5 days.
3.What payment methods are accepted for MAX697EJE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX697EJE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX697EJE?
MAX697EJE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX697EJE 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 MAX697EJE?
For technical support, including MAX697EJE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX697EJE requirements.
6.How does Aetrix verify that MAX697EJE is sourced from the original manufacturer or authorized distributors?
All MAX697EJE 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 MAX697EJE meets industry standards.
7.What is the process for return or replacement of MAX697EJE?
All MAX697EJE units undergo pre-shipment inspection (PSI). If there is an issue with MAX697EJE, 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 MAX697EJE part is unused and in its original packaging.
Return procedure for MAX697EJE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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