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Analog Devices Inc./Maxim Integrated MAX693MJE/883B
- Part No.:
- MAX693MJE/883B
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX693MJE/883B.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,681
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Product details
Overview
The MAX693MJE/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, features 4.4V reset threshold, 50ms/200ms selectable reset timeout, and supports VCC = 4.5–5.5V and VBATT = 2.0–4.0V.
For engineers reviewing the MAX693MJE/883B datasheet, MAX693MJE/883B pinout, MAX693MJE/883B application, or MAX693MJE/883B equivalent, this page delivers verified electrical parameters, military-qualified package details (CERDIP), functional pin mapping, real-world use cases in avionics and ruggedized controllers, and two validated alternative parts with documented timing and interface differences.
Technical Context
The MAX693MJE/883B integrates five core supervisory functions: precision reset generation with 4.4V threshold and 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 IN/CE OUT gating logic that forces CE OUT high when VCC drops below 4.4V to prevent erroneous RAM writes.
Its 16-pin CERDIP package includes dedicated outputs-BATT ON (25mA sink), LOW LINE (fast VCC-fall indicator), WDO (watchdog fault flag), and RESET (active-low)-and configurable timing inputs (OSC SEL, OSC IN) enabling precise adjustment of reset delay and watchdog timeout without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4V ±0.15V - ensures reliable reset assertion for 5V ±10% supplies during brownout |
| Reset Timeout Delay | 50ms (default) or 200ms (selectable) - holds µP in reset long enough for oscillator startup and stable power |
| Watchdog Timeout | 100ms or 1.6s (adjustable via OSC SEL/OSC IN) - enables software execution monitoring with flexible fault response timing |
| Battery Switchover Threshold | VCC − VBATT = 70mV (rising), 50mV (falling) - prevents oscillation during slow VCC transitions with 20mV hysteresis |
| PFI Detection Threshold | 1.3V ±0.1V - allows accurate power-fail warning using external resistor divider on unregulated or regulated rails |
| Supply Current (Backup Mode) | 0.6–1.0µA - extends lithium or coin-cell battery life for years in memory-retention applications |
| Operating Temperature | –55°C to +125°C - qualified per MIL-PRF-38535 Class B for aerospace and defense systems |
Pinout & Package
MAX693MJE/883B is supplied in a 16-pin hermetically sealed CERDIP package (JEDEC MS-018AC), rated for military temperature range and high-reliability environments. 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; switchover occurs when VCC falls below VBATT minus 50–70mV |
| 3 | VOUT | Switched output delivering higher of VCC or VBATT; powers CMOS RAM directly (50mA max) |
| 4 | GND | Ground reference for all analog and digital circuitry; must be low-impedance connection |
| 5 | PFI | Noninverting input to 1.3V comparator; used for power-fail or low-battery sensing via external divider |
| 6 | PFO | Active-low power-fail output; drives µP NMI line when PFI < 1.3V |
| 7 | WDI | Three-level watchdog input; toggling required every 100ms or 1.6s to prevent reset pulse |
| 8 | OSC SEL | Oscillator select; floating/high enables internal oscillator, low enables external clock/capacitor mode |
| 9 | OSC IN | External clock or capacitor input; sets precise watchdog/reset timing when OSC SEL = low |
| 10 | WDO | Active-low watchdog fault flag; remains low until next WDI transition after timeout |
| 11 | RESET | Active-low reset output; asserted during power-up, brownout, or watchdog timeout |
| 12 | CE IN | Chip-enable gating input; CE OUT follows CE IN only when VCC > 4.4V |
| 13 | CE OUT | Controlled chip-enable output; forced high during undervoltage to block RAM writes |
| 14 | BATT ON | Active-high battery-on indicator; sinks 25mA to drive external PNP pass transistor base |
| 15 | LOW LINE | Fast VCC-fall detector; goes low immediately when VCC drops below 4.4V |
| 16 | RESET | Active-high reset output; inverted complement of pin 11 |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset & Watchdog Timing | Configurable via OSC SEL/OSC IN pins - eliminates need for external RC networks or trimmers |
| CMOS RAM Write Protection | Hardware-enforced CE gating - blocks writes during brownout without µP firmware intervention |
| Military Temperature Qualification | MIL-PRF-38535 Class B screening - guarantees operation from –55°C to +125°C with full parametric test |
| Low-Power Backup Mode | ≤1µA quiescent current - enables multi-year data retention on coin-cell batteries |
| Dual-Voltage Monitoring | Simultaneous VCC supervision (4.4V) and PFI monitoring (1.3V) - supports both supply and battery health checks |
Applications
| Avionics Power Management | Rugged Industrial Controller |
|---|---|
Use Scenario: Real-time flight control system requiring guaranteed µP reset on voltage sag and nonvolatile memory retention during engine start transients. IC Role / Device Role / Timing Role: MAX693MJE/883B provides active-low RESET, BATT ON–driven external pass transistor control, and PFO-triggered NMI for last-chance data save before shutdown. Use Value: 50ms reset hold time ensures safe µP initialization; 1µA backup current enables 10+ year battery life in sealed cockpit modules. | Use Scenario: Programmable logic controller operating in oilfield environments with wide ambient temperature swings and unstable DC bus voltage. IC Role / Device Role / Timing Role: MAX693MJE/883B monitors VCC and unregulated input via PFI, asserts LOW LINE for fast fault logging, and gates CE to preserve configuration EEPROM during brownouts. Use Value: 4.4V reset threshold matches 5V ±10% industrial supplies; –55°C to +125°C rating eliminates derating concerns in desert or arctic deployments. |
| Defense Communications Radio | Space-Qualified Telemetry Module |
Use Scenario: Secure HF/VHF radio with encrypted firmware storage and watchdog-protected boot sequence in mobile tactical vehicles. IC Role / Device Role / Timing Role: MAX693MJE/883B generates 200ms reset pulse after power-on, uses WDI toggling to validate bootloader integrity, and disables CE during antenna tuning voltage dips. Use Value: Adjustable watchdog (100ms/1.6s) accommodates variable boot times; CE OUT forcing prevents corruption of crypto keys during RF power cycling. | Use Scenario: Low-power satellite telemetry unit powered by solar-charged Li-ion with strict radiation-tolerant component requirements. IC Role / Device Role / Timing Role: MAX693MJE/883B supervises primary bus, switches to backup cell via VOUT, detects battery depletion via PFI, and signals fault via WDO to onboard FPGA. Use Value: Hermetic CERDIP package resists outgassing in vacuum; 1.3V PFI threshold enables precise end-of-life battery detection before telemetry loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693CPE+ | Commercial-grade (0°C to +70°C), plastic DIP package, same pinout and electrical specs | Not qualified for extended temperature or shock/vibe; unsuitable for flight hardware or embedded military systems | Select only for lab prototypes or ground-based non-critical systems where cost and availability outweigh reliability requirements |
| MAX695MJE/883B | Same military CERDIP package and temp range, but 4.65V reset threshold and 200ms fixed reset timeout | Designed for tighter 5V ±5% supplies; lacks adjustable watchdog timing (fixed 1.6s only) | Choose when system requires higher reset threshold and simpler timing, but cannot tolerate 100ms watchdog option |
Compared with MAX693CPE+ and MAX695MJE/883B, the MAX693MJE/883B uniquely combines military qualification, 4.4V reset threshold for wider 5V tolerance, and dual-mode watchdog timing - making it optimal for avionics and field-deployed controllers needing both robustness and configurability.
Availability
MAX693MJE/883B is available at Aetrix Electronics and suitable for avionics power management, rugged industrial controllers, defense communications radios, and space-qualified telemetry modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX693MJE/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 applications including aerospace, industrial, and medical systems.
The MAX690–MAX695 family was engineered specifically for microprocessor-based systems requiring integrated power supervision, battery backup, and fault monitoring in harsh environments - with the MAX693 variant optimized for 4.4V reset compatibility and military-grade packaging.
FAQ
What is the reset voltage threshold of the MAX693MJE/883B, and how does it differ from other MAX690-family parts?
The MAX693MJE/883B has a guaranteed reset voltage threshold of 4.25V minimum to 4.5V maximum, with typical value 4.4V. This distinguishes it from MAX690/MAX691/MAX694/MAX695 (4.5V–4.75V, typical 4.65V) and aligns it with systems using 5V ±10% supplies. The 40mV hysteresis prevents chatter during slow VCC transitions, and the threshold is fully characterized across –55°C to +125°C per MIL-PRF-38535 Class B testing.
Does the MAX693MJE/883B support adjustable watchdog timeout, and how is it configured?
Yes, the MAX693MJE/883B supports two watchdog timeout periods: 100ms and 1.6s. Configuration is done via OSC SEL and OSC IN pins. When OSC SEL is floating or high, OSC IN selects the period (low = 100ms, high/floating = 1.6s). When OSC SEL is low, an external clock or capacitor on OSC IN enables further timing granularity. This adjustability is retained in the MAX693MJE/883B and is not available in the 8-pin MAX692 or MAX694 variants.
How does the CE gating function work on the MAX693MJE/883B, and what is its purpose?
The MAX693MJE/883B uses CE IN and CE OUT pins to protect CMOS RAM or EEPROM from spurious writes during undervoltage. When VCC ≥ 4.4V, CE OUT mirrors CE IN with ~50ns delay. If VCC drops below 4.4V, CE OUT is forced high regardless of CE IN state - disabling chip select and preventing data corruption. This hardware-level gating operates independently of µP firmware and is critical for mission-critical memory retention in the MAX693MJE/883B.
What is the battery switchover behavior of the MAX693MJE/883B, and what are the voltage thresholds?
The MAX693MJE/883B switches VOUT between VCC and VBATT based on relative voltage. Switchover occurs at VCC − VBATT = +70mV (rising) and +50mV (falling), with 20mV hysteresis to prevent oscillation. In backup mode (VCC < VBATT − 0.2V), VOUT delivers VBATT − 0.1V at 250µA load. The internal 200Ω MOSFET enables low-dropout battery delivery, and BATT ON pin provides 25mA sink current to drive external PNP transistors for higher load currents.
Is the MAX693MJE/883B pin-compatible with other 16-pin MAX690-family devices, and which ones share the same footprint?
Yes, the MAX693MJE/883B is pin-compatible with MAX691MJE/883B and MAX695MJE/883B in the 16-pin CERDIP package. All three share identical pin assignments for VCC, VBATT, VOUT, GND, PFI, PFO, WDI, OSC SEL, OSC IN, WDO, RESET, CE IN, CE OUT, BATT ON, LOW LINE, and RESET. Differences lie in reset threshold (4.4V vs. 4.65V), watchdog adjustability (MAX693/MAX695 support it; MAX691 does not), and reset timeout (50ms/200ms vs. fixed 200ms in MAX695).
MAX693MJE/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:
- 4.4V
- 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
MAX693MJE/883B FAQ
1.How can I place an order for MAX693MJE/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693MJE/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 MAX693MJE/883B reliable?
The price and inventory of MAX693MJE/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693MJE/883B is usually 5 days.
3.What payment methods are accepted for MAX693MJE/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693MJE/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693MJE/883B?
MAX693MJE/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693MJE/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 MAX693MJE/883B?
For technical support, including MAX693MJE/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693MJE/883B requirements.
6.How does Aetrix verify that MAX693MJE/883B is sourced from the original manufacturer or authorized distributors?
All MAX693MJE/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 MAX693MJE/883B meets industry standards.
7.What is the process for return or replacement of MAX693MJE/883B?
All MAX693MJE/883B units undergo pre-shipment inspection (PSI). If there is an issue with MAX693MJE/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 MAX693MJE/883B part is unused and in its original packaging.
Return procedure for MAX693MJE/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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