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Analog Devices Inc./Maxim Integrated MAX1232MJA/883B
- Part No.:
- MAX1232MJA/883B
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX1232MJA/883B.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,304
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Product details
Overview
MAX1232MJA/883B from Maxim Integrated is a military-grade microprocessor supervisory circuit that monitors +5V supply voltage, provides 250ms reset pulse width, supports digitally selectable 5% or 10% VCC tolerance, features a programmable watchdog timer (150ms/600ms/1.2s), and includes a debounced manual reset input. It operates across –55°C to +125°C and is used in avionics, missile guidance, and ruggedized embedded control systems requiring high-reliability power supervision.
For engineers reviewing the MAX1232MJA/883B datasheet, MAX1232MJA/883B pinout, MAX1232MJA/883B application, or MAX1232MJA/883B equivalent, key selection criteria include its CERDIP-8 military packaging, guaranteed operation at –55°C to +125°C, dual active-high/active-low reset outputs, adjustable watchdog timeout, and precision voltage detection with no external components required.
Technical Context
The MAX1232MJA/883B integrates three core supervision functions: a precision voltage detector with user-selectable 4.62V (5%) or 4.37V (10%) trip points, a falling-edge-triggered watchdog timer whose timeout is set by TD pin voltage (GND = 150ms, open = 600ms, VCC = 1.2s), and a debounced pushbutton reset input (PBRST) with 20ms minimum assertion time and 1–4ms delay before reset activation.
It delivers dual complementary reset outputs: RST (active-high, push-pull) and RST (active-low, open-drain), enabling direct interface with both TTL and CMOS microprocessors. The device draws only 50–200µA quiescent current and requires zero external components for full functionality, making it suitable for space-constrained, low-power military designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - compatible with standard +5V logic rails and tolerant of regulator ripple or droop. |
| Reset Pulse Width | 250ms minimum - ensures stable μP initialization after power-up, brownout, or manual reset. |
| VCC Trip Point | 4.62V (5% tol.) or 4.37V (10% tol.) - selected via TOL pin; guarantees reliable reset during supply sag. |
| Watchdog Timeout | 150ms / 600ms / 1.2s - configurable via TD pin; prevents runaway code without software modification. |
| Operating Temp Range | –55°C to +125°C - qualified per MIL-PRF-38535 Class B for extended military and aerospace use. |
| Quiescent Current | 50µA typical - reduces system standby power by >90% vs. DS1232, critical for battery-backed systems. |
| Reset Outputs | RST (push-pull, active-high) + RST (open-drain, active-low) - supports mixed-logic interfacing without external pull-ups. |
Pinout & Package
MAX1232MJA/883B is housed in an 8-pin CERDIP (Ceramic Dual In-line Package) with hermetic sealing and military-grade reliability. Pinout conforms to standard DIP layout with pin 1 designated by notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PBRST | Debounced active-low manual reset input; ignores <1ms glitches, recognizes ≥20ms pulses; internal ~40kΩ pull-up to VCC. |
| 2 | TD | Watchdog timebase select: GND = 150ms, open = 600ms, VCC = 1.2s timeout; sets ST strobe interval. |
| 3 | TOL | Tolerance select: GND = 5% (4.62V), VCC = 10% (4.37V); configures VCC undervoltage detection threshold. |
| 4 | GND | Analog/digital ground reference; must be connected to system ground plane for accurate voltage monitoring. |
| 5 | RST | Active-high reset output (push-pull); drives high/low directly; sinks/source up to 12mA; asserts on VCC fault or ST timeout. |
| 6 | RST | Active-low open-drain reset output; requires external pull-up; sinks up to 10mA; complements RST for mixed-logic systems. |
| 7 | ST | Watchdog strobe input; triggered only on falling edge; must be toggled within timeout period to prevent reset assertion. |
| 8 | VCC | +5V supply input; monitored for undervoltage; absolute max rating –1V to +7V; decoupling capacitor recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Plug-in DS1232 upgrade | Pin-compatible replacement with identical footprint and function, enabling drop-in field upgrades in legacy military hardware. |
| Dual reset outputs | RST (push-pull) and RST (open-drain) eliminate need for level-shifting or external inverters in heterogeneous logic environments. |
| No external components | Full supervision functionality - voltage detection, watchdog, manual reset - achieved with zero external passives or resistors. |
| Military temperature range | –55°C to +125°C operation verified per MIL-PRF-38535 Class B; suitable for engine bays, radar housings, and space payloads. |
| Low-power supervision | 50–200µA ICC enables continuous monitoring in battery-powered telemetry and remote sensor nodes without compromising runtime. |
Applications
| Avionics Power Monitoring | Missile Guidance Control |
|---|---|
|
Use Scenario: Real-time monitoring of 5V power rails in flight control computers where voltage sags below 4.62V indicate regulator failure or load transients. IC Role / Device Role / Timing Role: Primary power-fail detector and reset initiator; asserts RST/RST within 100ns of VCC crossing trip point. Use Value: Prevents erroneous actuation of control surfaces by ensuring μP remains held in reset until supply stabilizes for ≥250ms. |
Use Scenario: Supervising radiation-hardened microprocessors in guidance subsystems exposed to extreme thermal cycling and vibration. IC Role / Device Role / Timing Role: Watchdog timer enforces software liveness; ST strobe failure triggers 250ms reset pulse to restart navigation loop. Use Value: Guarantees deterministic recovery from single-event upsets (SEUs) without requiring external reset sequencers. |
| Ruggedized Industrial PLCs | Spacecraft Onboard Computers |
|
Use Scenario: Embedded controller in oilfield downhole tools operating at 125°C ambient, powered by isolated DC-DC converters. IC Role / Device Role / Timing Role: Voltage supervisor and manual reset interface; TOL pin hardwired to GND for 4.62V trip; PBRST driven by front-panel switch. Use Value: Eliminates need for discrete RC reset circuits, reducing BOM count and improving long-term reliability under thermal stress. |
Use Scenario: Housekeeping IC in satellite attitude determination units where latch-up immunity and hermetic packaging are mandatory. IC Role / Device Role / Timing Role: Dual-reset generator with CERDIP-8 package; RST drives FPGA configuration reset; RST pulls down μP reset line via pull-up resistor. Use Value: Hermetic ceramic package prevents moisture ingress and outgassing in vacuum, meeting NASA EEE-INST-002 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS1232L+T&R | Lower quiescent current (10µA), but only rated for –40°C to +85°C; no programmable watchdog; fixed 200ms reset pulse. | Limited to commercial/industrial environments; lacks TD/TOL configurability and dual reset outputs. | Select only if operating temperature ≤85°C and watchdog functionality is unnecessary. |
| MAX6361LCS18+T | Single active-low reset output; 1.8V–5.5V wide input range; integrated 1.25V reference; no manual reset input. | Designed for low-voltage portable systems; incompatible pinout and missing PBRST/ST interface. | Use only for new designs targeting sub-3.3V rails and where manual reset is not required. |
Compared with DS1232L+T&R and MAX6361LCS18+T, the MAX1232MJA/883B uniquely combines military temperature range, dual reset outputs, programmable watchdog, and plug-in compatibility with legacy DS1232-based systems-making it irreplaceable for sustainment and upgrade of deployed defense platforms.
Availability
MAX1232MJA/883B is available at Aetrix Electronics and suitable for avionics power monitoring, missile guidance control, and ruggedized industrial PLCs requiring stable component supply under extended temperature and long-lifecycle procurement conditions.
Supply support for MAX1232MJA/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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding applications.
The MAX1232MJA/883B belongs to Maxim's military-grade supervisory IC product line, engineered specifically for high-reliability embedded systems where power integrity, watchdog safety, and environmental resilience are non-negotiable.
FAQ
What is the operating temperature range of the MAX1232MJA/883B?
The MAX1232MJA/883B is specified for operation from –55°C to +125°C and is fully qualified per MIL-PRF-38535 Class B. This extended range enables deployment in jet engine compartments, missile canisters, and orbital spacecraft where ambient temperatures exceed commercial or industrial limits. Its CERDIP-8 package ensures hermetic sealing and thermal stability across this full span.
Does the MAX1232MJA/883B require external components to function?
No, the MAX1232MJA/883B requires zero external components for full operation. All supervision functions-including voltage monitoring, watchdog timing, and manual reset debouncing-are implemented internally. A bypass capacitor on VCC is recommended but not mandatory for basic functionality, distinguishing it from discrete reset solutions that rely on RC networks.
How does the watchdog timer on the MAX1232MJA/883B work?
The MAX1232MJA/883B watchdog timer is edge-triggered: it resets only on falling edges of the ST input. If ST is not strobed within the timeout period (150ms/600ms/1.2s, set by TD pin), RST and RST assert for ≥250ms. The timeout is retriggered on each valid ST falling edge, providing fail-safe software execution monitoring without firmware overhead.
What is the difference between the RST and RST outputs on the MAX1232MJA/883B?
RST is an active-high push-pull output capable of sourcing/sinking up to 12mA, while RST is an active-low open-drain output that sinks up to 10mA and requires an external pull-up. This dual-output architecture allows the MAX1232MJA/883B to interface directly with both TTL and CMOS microprocessors, FPGAs, and ASICs without additional logic or level shifters.
Is the MAX1232MJA/883B pin-compatible with the DS1232?
Yes, the MAX1232MJA/883B is a direct plug-in upgrade for the Dallas DS1232 in CERDIP-8 packaging. Pin assignments, electrical behavior, and functional timing (including 250ms reset pulse width and voltage trip points) match exactly, enabling seamless replacement in legacy military and aerospace systems without PCB or firmware changes.
MAX1232MJA/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.37V, 4.62V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 250ms Minimum
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
MAX1232MJA/883B FAQ
1.How can I place an order for MAX1232MJA/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1232MJA/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 MAX1232MJA/883B reliable?
The price and inventory of MAX1232MJA/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1232MJA/883B is usually 5 days.
3.What payment methods are accepted for MAX1232MJA/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1232MJA/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1232MJA/883B?
MAX1232MJA/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1232MJA/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 MAX1232MJA/883B?
For technical support, including MAX1232MJA/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1232MJA/883B requirements.
6.How does Aetrix verify that MAX1232MJA/883B is sourced from the original manufacturer or authorized distributors?
All MAX1232MJA/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 MAX1232MJA/883B meets industry standards.
7.What is the process for return or replacement of MAX1232MJA/883B?
All MAX1232MJA/883B units undergo pre-shipment inspection (PSI). If there is an issue with MAX1232MJA/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 MAX1232MJA/883B part is unused and in its original packaging.
Return procedure for MAX1232MJA/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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