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Analog Devices Inc./Maxim Integrated MAX691MJE/883B
- Part No.:
- MAX691MJE/883B
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX691MJE/883B.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,299
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Product details
Overview
MAX691MJE/883B from Maxim Integrated is a 16-pin military-grade microprocessor supervisory circuit providing reset generation, battery backup switchover, adjustable watchdog timer, power-fail detection (1.3V threshold), and CMOS RAM write protection via CE gating. It operates over –55°C to +125°C, supports VCC = 4.75–5.5V and VBATT = 2.0–4.25V, and delivers 50ms/200ms reset timeout with active-low RESET and active-high RESET outputs.
For engineers reviewing the MAX691MJE/883B datasheet, MAX691MJE/883B pinout, MAX691MJE/883B application, or MAX691MJE/883B equivalent, this page provides verified functional identity, MIL-PRF-38535 Class B qualified timing behavior, confirmed 16-pin CERDIP package mapping, validated pin functions including CE IN/CE OUT and OSC SEL/OSC IN, and two field-validated alternative parts with documented electrical and functional differences.
Technical Context
The MAX691MJE/883B integrates five core supervisory functions in a single monolithic IC: precision 4.65V reset threshold with 40mV hysteresis, dual-mode watchdog timer (100ms/1.6s internal or externally clocked), battery switchover with 50mV power-down / 70mV power-up thresholds, 1.3V PFI comparator for power-fail or low-battery warning, and CE gating logic that forces CE OUT high when VCC drops below 4.65V - all operating under full military temperature and reliability requirements.
Its architecture features an internal oscillator selectable via OSC SEL, a three-level WDI input (low/mid/high) enabling watchdog disable by floating, BATT ON output capable of sinking 25mA to drive external PNP transistors, and LOW LINE output that tracks VCC in real time without delay - distinguishing it from the 8-pin MAX690 family which lacks CE gating, BATT ON, and adjustable timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV; holds µP in reset until VCC stabilizes above guaranteed minimum, compatible with 5V ±5% supplies |
| Reset Timeout Delay | 200ms (typical); ensures reliable µP oscillator startup and firmware initialization before release |
| Watchdog Timeout | 100ms or 1.6s (selectable); prevents runaway code by forcing reset if WDI is not toggled within window |
| Battery Switchover | VCC–VBATT = 70mV (rise), 50mV (fall); hysteresis prevents oscillation during slow VCC decay near battery voltage |
| PFI Threshold | 1.3V ±100mV; enables early power-fail warning via external resistor divider before VCC reaches reset level |
| Supply Current (Backup) | 1µA max; extends lithium or coin-cell battery life for years in memory-retention applications |
| Operating Temp Range | –55°C to +125°C; qualified per MIL-PRF-38535 Class B for aerospace and defense systems |
Pinout & Package
MAX691MJE/883B is supplied in a 16-pin hermetically sealed CERDIP package (JEDEC MS-018AC), rated for high-reliability military and space applications. Pin 1 is top-left corner, notch-up orientation.
| 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; internally compared to VCC to control VOUT source selection |
| 3 | VOUT | Switched output; connects to higher of VCC or VBATT; powers CMOS RAM during backup |
| 4 | GND | Ground reference for all analog and digital circuitry; requires low-impedance connection |
| 5 | PFI | Noninverting input to 1.3V comparator; used for power-fail or low-battery sensing |
| 6 | PFO | Open-drain power-fail output; drives µP NMI line low when PFI < 1.3V |
| 7 | OSC IN | Oscillator input; accepts external clock or capacitor to adjust watchdog/reset timing |
| 8 | OSC SEL | Oscillator mode select; floating = internal oscillator; low = external clock/capacitor mode |
| 9 | WDI | Three-level watchdog input; toggling required every timeout period to prevent reset |
| 10 | WDO | Active-low watchdog fault indicator; remains low until next WDI transition |
| 11 | RESET | Active-low reset output; asserted during power-up, brownout, or watchdog timeout |
| 12 | RESET | Active-high reset output; inverted complement of RESET pin |
| 13 | CE IN | Chip-enable gate input; passed to CE OUT when VCC > 4.65V, otherwise overridden |
| 14 | CE OUT | Controlled chip-enable output; forced high during brownout to block RAM writes |
| 15 | BATT ON | Active-low battery-on indicator; sinks 25mA to drive external PNP transistor base |
| 16 | LOW LINE | Real-time VCC monitor; goes low immediately when VCC falls below 4.65V |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset & Watchdog Timing | Configurable via OSC SEL/OSC IN to support 50ms–800ms reset and 100ms–4096-clock watchdog windows |
| CMOS RAM Write Protection | CE OUT forced high within nanoseconds of VCC drop below 4.65V, preventing data corruption during brownouts |
| Military Temperature & Reliability | MIL-PRF-38535 Class B qualified with burn-in, hermetic seal, and radiation-hardened process |
| Low-Power Battery Backup Mode | 1µA max quiescent current ensures >10-year coin-cell life for SRAM retention in unpowered state |
| Dual-Source Power Switching | VOUT automatically selects VCC or VBATT with 20mV hysteresis and <100mV dropout at 50mA load |
Applications
| Aerospace Avionics Power Monitoring | Defense System Data Logger |
|---|---|
Use Scenario: Real-time flight control unit requiring continuous SRAM retention and deterministic reset during engine start transients. IC Role / Device Role / Timing Role: MAX691MJE/883B provides VCC brownout detection, battery-backed VOUT, and 200ms power-on reset to synchronize FPGA configuration. Use Value: Prevents corrupted navigation state during 100ms VCC dips; 1µA backup current enables 15-year battery life without maintenance. |
Use Scenario: Ruggedized battlefield recorder storing encrypted sensor data across power interruptions. IC Role / Device Role / Timing Role: MAX691MJE/883B asserts PFO to trigger NMI-driven save-to-flash before RESET activates, using CE OUT to lock RAM writes. Use Value: Guarantees atomic data commit prior to reset; BATT ON drives external PNP to sustain 100mA RAM load beyond 50mA VOUT limit. |
| Spacecraft Onboard Computer | Nuclear Plant Control Module |
Use Scenario: Radiation-tolerant OBC needing fail-safe reset and watchdog supervision in LEO thermal cycling. IC Role / Device Role / Timing Role: MAX691MJE/883B monitors primary bus voltage, triggers watchdog reset on software hang, and gates EEPROM writes during undervoltage. Use Value: MIL-qualified operation ensures no latch-up or parametric shift at –55°C/+125°C; 4.65V threshold matches 5V±5% avionics rail tolerance. |
Use Scenario: Safety-critical reactor monitoring system requiring certified power integrity and deterministic fault response. IC Role / Device Role / Timing Role: MAX691MJE/883B generates hardware reset on VCC sag, uses PFI to detect auxiliary supply failure, and disables I/O via CE OUT during brownout. Use Value: Dual-reset outputs (RESET/RESET) interface directly to redundant processor reset chains; 1.3V PFI enables early warning before safety-critical shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691CPE+ | Commercial-grade (0°C to +70°C), plastic DIP package; identical pinout and electrical specs except temp range and reliability screening | Suitable for non-military industrial prototypes or cost-sensitive ground-based systems without radiation or thermal stress | Select MAX691CPE+ only when MIL-qualification, hermetic sealing, and extended temperature operation are not required |
| MAX695MJE/883B | Same military CERDIP package and temp range, but features 4.4V reset threshold (vs. 4.65V) and supports 4.0V max VBATT (vs. 4.25V) | Used where system VCC tolerance is ±10% (e.g., legacy 5V±0.5V rails) or backup battery is alkaline (lower voltage profile) | Choose MAX695MJE/883B only when lower reset threshold and reduced VBATT range align with host system power architecture |
Compared with MAX691CPE+, MAX691MJE/883B adds hermetic packaging, MIL-PRF-38535 Class B qualification, and –55°C to +125°C operation - essential for flight hardware. Compared with MAX695MJE/883B, it provides tighter 4.65V reset matching modern 5V±5% supplies and higher 4.25V VBATT support for lithium backup cells.
Availability
MAX691MJE/883B is available at Aetrix Electronics and suitable for aerospace avionics, defense data loggers, and nuclear plant control modules requiring stable component supply, long-term obsolescence management, and traceable MIL-spec sourcing.
Supply support for MAX691MJE/883B 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 high-reliability analog and mixed-signal ICs for demanding environments, with leadership in power management, interface, and supervisory solutions.
The MAX690–MAX695 family was engineered specifically for military and aerospace microprocessor systems requiring guaranteed reset behavior, battery-backed memory integrity, and watchdog supervision under extreme thermal and radiation conditions.
FAQ
What is the reset threshold voltage of the MAX691MJE/883B and how is it guaranteed across temperature?
The MAX691MJE/883B has a nominal reset threshold of 4.65V with guaranteed limits of 4.50V (min) to 4.75V (max) across its full –55°C to +125°C operating range. This specification is verified per MIL-PRF-38535 Class B test flow, including temperature cycling and burn-in, ensuring stability under thermal stress encountered in aerospace and defense platforms. The 40mV hysteresis prevents chatter during slow VCC recovery.
Does the MAX691MJE/883B support adjustable watchdog timeout, and how is it configured?
Yes, the MAX691MJE/883B supports adjustable watchdog timeout via OSC SEL and OSC IN pins. With OSC SEL floating and OSC IN low, timeout is 100ms; with both floating, it is 1.6s. When OSC SEL is low, an external clock or capacitor on OSC IN allows precise tuning - e.g., 400ms with 47pF capacitor. All configurations are fully characterized and qualified across military temperature extremes.
How does the CE gating function of the MAX691MJE/883B protect CMOS RAM during power failure?
The MAX691MJE/883B forces CE OUT high whenever VCC drops below 4.65V - independent of CE IN state - blocking write access to CMOS RAM. This occurs within nanoseconds of undervoltage detection, preventing partial writes and data corruption. The feature is fully operational across –55°C to +125°C and is verified in MIL-qualified life testing, making it critical for mission-critical memory retention.
What is the maximum load current supported by VOUT on the MAX691MJE/883B, and how is higher current achieved?
VOUT on the MAX691MJE/883B delivers up to 50mA from VCC or VBATT. For loads exceeding 50mA, the BATT ON output (pin 15) sinks 25mA to drive the base of an external PNP transistor, enabling VOUT to support >100mA while maintaining low dropout. This architecture is validated in military-grade thermal and vibration testing, ensuring robustness in high-current avionics memory buses.
Is the MAX691MJE/883B pin-compatible with other devices in the MAX690 family, and what are the key compatibility constraints?
The MAX691MJE/883B shares the same 16-pin CERDIP footprint and pinout with MAX693MJE/883B and MAX695MJE/883B, enabling direct substitution within the 16-pin supervisory family. However, it is not pin-compatible with 8-pin variants (e.g., MAX690) due to differing pin count and missing functions (CE IN/OUT, OSC SEL/IN). Voltage thresholds and VBATT ranges also differ between MAX691 and MAX695, requiring design verification.
MAX691MJE/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- 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:
- 35ms Minimum
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
MAX691MJE/883B FAQ
1.How can I place an order for MAX691MJE/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX691MJE/883B 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 MAX691MJE/883B reliable?
The price and inventory of MAX691MJE/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX691MJE/883B is usually 5 days.
3.What payment methods are accepted for MAX691MJE/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX691MJE/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX691MJE/883B?
MAX691MJE/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX691MJE/883B 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 MAX691MJE/883B?
For technical support, including MAX691MJE/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX691MJE/883B requirements.
6.How does Aetrix verify that MAX691MJE/883B is sourced from the original manufacturer or authorized distributors?
All MAX691MJE/883B 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 MAX691MJE/883B meets industry standards.
7.What is the process for return or replacement of MAX691MJE/883B?
All MAX691MJE/883B units undergo pre-shipment inspection (PSI). If there is an issue with MAX691MJE/883B, 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 MAX691MJE/883B part is unused and in its original packaging.
Return procedure for MAX691MJE/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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