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Analog Devices Inc. ADM1232ARN-REEL
- Part No.:
- ADM1232ARN-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM1232ARN-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADM1232ARN-REEL from Analog Devices is a 5 V microprocessor supervisory circuit in an 8-lead narrow SOIC (R-8) package, featuring adjustable voltage monitoring (4.5 V or 4.75 V trip), programmable strobe timeout (150/600/1200 ms), push-button reset with 20 ms debounce, open-drain RESET and active-high RESET outputs, and operation from −40°C to +85°C. It monitors supply voltage, detects microprocessor lockup via STROBE activity, and supports manual reset in embedded controllers and portable instrumentation.
For engineers reviewing the ADM1232ARN-REEL datasheet, ADM1232ARN-REEL pinout, ADM1232ARN-REEL application, or ADM1232ARN-REEL equivalent, key selection considerations include its dual-reset output architecture, tolerance-selectable VCC trip point, TD-configurable watchdog timeout, and compatibility with legacy MAX1232 and DS1232 systems requiring reliable power-on and brownout reset sequencing.
Technical Context
The ADM1232ARN-REEL integrates three independent supervision functions: precision VCC threshold detection with 5% or 10% tolerance selection via TOLERANCE pin, a debounced PB RESET input with guaranteed 20 ms assertion time, and a configurable watchdog timer triggered by STROBE edge transitions. Its internal time-base generator sets timeout periods based on TD pin voltage level (GND/floating/VCC).
It delivers complementary reset signaling: RESET provides active-high CMOS/TTL-compatible output capable of sourcing/sinking up to 10 mA, while RESET is an open-drain output requiring external pull-up and supporting wired-OR configurations. Both outputs assert during power-up, VCC undervoltage, PB RESET activation, or STROBE timeout events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.5 V (10% tolerance) or 4.75 V (5% tolerance); selected by TOLERANCE pin connection to VCC or GND - defines brownout detection threshold for system reset initiation. |
| Strobe Timeout | 150 ms (TD = GND), 600 ms (TD = floating), or 1.2 s (TD = VCC); determines maximum allowed STROBE inactivity before watchdog reset - enables flexible firmware heartbeat monitoring. |
| RESET Active Time | 250–1000 ms; minimum reset pulse width ensures reliable microprocessor initialization across temperature and supply variations. |
| Supply Current | 20–50 μA at CMOS logic levels; ultra-low quiescent current supports battery-powered portable equipment and always-on monitoring. |
| Operating Temp | −40°C to +85°C; qualified for industrial and automotive under-hood environments where thermal stability is critical for reset reliability. |
| Input Leakage | ±1.0 μA on STROBE and TOLERANCE pins; minimizes impact on external timing or bias networks in high-impedance circuits. |
| Reset Delay | 50 μs after VCC fall below trip point; fast response prevents processor corruption during rapid supply collapse. |
Pinout & Package
ADM1232ARN-REEL is housed in an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch, 5.00 × 3.96 mm body size, and 1.75 mm max height. Pin 1 is marked with a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PB RESET | Debounced manual reset input | Accepts push-button or logic-low signal; ignores glitches <1 ms, guarantees reset if held low ≥20 ms - eliminates need for external RC debounce. |
| 2 TD | Timeout delay configuration | Selects strobe watchdog period (150/600/1200 ms) by connecting to GND/floating/VCC - enables single-component adaptation to varying firmware loop times. |
| 3 TOLERANCE | Voltage monitor sensitivity select | Connect to GND for 4.75 V trip (5%), or to VCC for 4.5 V trip (10%) - allows precise matching to system rail tolerance requirements. |
| 4 GND | Ground reference | 0 V return for all internal circuitry and I/O - must be low-impedance connection to avoid false resets due to ground bounce. |
| 5 RESET | Active-high reset output | CMOS/TTL-compatible output sourcing/sinking up to 10 mA - drives microprocessor RESET directly without buffer or level-shifting. |
| 6 RESET | Open-drain reset output | Sinks current only; requires external pull-up - enables shared reset bus with multiple devices or OR-ing with other supervisors. |
| 7 STROBE | Watchdog activity input | Edge-triggered input monitoring microprocessor activity; reset asserted if no high-to-low transition occurs within TD-selected timeout - detects software hang. |
| 8 VCC | Power supply input | 5 V ±10% supply input; powers internal comparators, timers, and outputs - also used as reference for TOLERANCE selection. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible replacement | Direct drop-in for MAX1232 and Dallas DS1232LP - enables legacy design refresh without PCB or firmware changes. |
| No external components | Internal oscillator, comparator references, and debounce logic eliminate capacitors, resistors, or crystals - reduces BOM count and board space. |
| Dual reset outputs | Simultaneous active-high RESET and open-drain RESET support diverse host interface requirements - e.g., FPGA reset input + shared system reset bus. |
| Adjustable VCC monitor | 5% or 10% trip point selection via single pin - accommodates both tight-tolerance 5 V rails and looser industrial supplies. |
| Configurable watchdog | Three timeout options set by TD pin state - matches reset timing to application-specific firmware execution cycles without re-spinning hardware. |
Applications
| Industrial PLC Controllers | Medical Portable Monitors |
|---|---|
|
Use Scenario: Microcontroller-based programmable logic controller operating in factory-floor environments with fluctuating 5 V supply and risk of EMI-induced lockup. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and watchdog timeout to ensure deterministic boot and recovery from firmware hangs. Use Value: Prevents uncontrolled I/O states during supply transients using 4.5 V trip point and 600 ms strobe timeout - maintains safety-critical output integrity. |
Use Scenario: Battery-powered vital signs monitor with ARM Cortex-M3 MCU requiring low-power reset supervision and long-term reliability. IC Role / Device Role / Timing Role: Voltage and activity monitor asserting RESET during VCC sag or missed STROBE pulses - preserves data logging continuity and alarm responsiveness. Use Value: 20 μA quiescent current extends battery life; 150 ms strobe timeout aligns with real-time sensor sampling intervals - avoids spurious resets. |
| Automotive Body Control Modules | Networked Smart Sensors |
|
Use Scenario: Under-hood electronic control unit managing lighting and HVAC, exposed to −40°C cold cranking and 85°C engine bay temperatures. IC Role / Device Role / Timing Role: Temperature-qualified reset supervisor ensuring valid MCU operation across full automotive ambient range and supply ripple. Use Value: −40°C to +85°C rating and 50 μs VCC-fall reset delay guarantee immediate reset assertion during battery voltage collapse - prevents erratic actuator behavior. |
Use Scenario: Industrial IoT node with LoRaWAN radio and sensor fusion MCU, deployed in remote locations with infrequent maintenance. IC Role / Device Role / Timing Role: Dual-output supervisor enabling local reset (RESET) and system-wide fault signaling (open-drain RESET) over shared bus. Use Value: Open-drain RESET supports wired-OR fault aggregation across multiple nodes; 1.2 s timeout (TD = VCC) accommodates deep-sleep radio wake cycles - improves network uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1232CPA+ | Same 8-pin PDIP package; identical pinout and functional spec, but rated only to +70°C and higher supply current (100 μA typical). | Limited to commercial-temperature applications; less suitable for industrial or automotive deployments requiring extended temperature range. | Select when cost-sensitive commercial designs use PDIP sockets and do not require −40°C operation. |
| DS1232LPN+ | Same R-8 SOIC package and pinout; identical 5%/10% trip points and strobe timeout options, but lacks PB RESET debounce specification (no min 20 ms guarantee). | May require external RC filtering for push-button inputs; less robust against contact bounce in high-reliability systems. | Choose for legacy DS1232-based designs where existing layout uses R-8 and PB RESET is driven by clean logic signals. |
Compared with MAX1232CPA+ and DS1232LPN+, the ADM1232ARN-REEL offers guaranteed −40°C to +85°C operation, verified 20 ms PB RESET debounce, and lower 20 μA supply current - making it optimal for industrial, automotive, and battery-constrained applications demanding consistent reset behavior across environmental extremes.
Availability
ADM1232ARN-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and networked smart sensors requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for ADM1232ARN-REEL 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.
The ADM1232 belongs to Analog Devices' microprocessor supervisory product line, designed specifically to provide robust, low-power, pin-compatible reset and watchdog functionality for 5 V embedded systems where reliability and ease of integration are critical.
FAQ
What is the function of the TD pin on the ADM1232ARN-REEL?
The TD pin on the ADM1232ARN-REEL selects the strobe timeout period: connecting TD to GND yields 150 ms, leaving it floating gives 600 ms, and tying it to VCC sets 1.2 s. This configures the maximum allowable interval between STROBE input edges before the ADM1232ARN-REEL asserts RESET - enabling adaptation to different firmware loop durations without external components.
Does the ADM1232ARN-REEL support both 5% and 10% VCC tolerance monitoring?
Yes, the ADM1232ARN-REEL supports both 5% and 10% VCC tolerance monitoring via the TOLERANCE pin: connect TOLERANCE to GND for a 4.75 V trip point (5% below 5 V), or to VCC for a 4.5 V trip point (10% below 5 V). This dual-threshold capability allows precise alignment with system power rail specifications in the ADM1232ARN-REEL's operating range.
How does the PB RESET input on the ADM1232ARN-REEL handle mechanical switch bounce?
The PB RESET input on the ADM1232ARN-REEL includes an internal debounce circuit that ignores pulses shorter than 1 ms and guarantees reset assertion only when the input is held low for at least 20 ms. This eliminates the need for external RC filters or firmware debouncing, ensuring reliable manual reset activation even with low-cost tactile switches in the ADM1232ARN-REEL's industrial applications.
What is the difference between the RESET and RESET outputs of the ADM1232ARN-REEL?
The ADM1232ARN-REEL provides two complementary reset outputs: RESET is an active-high CMOS/TTL-compatible output capable of sourcing and sinking up to 10 mA, while RESET is an open-drain output requiring an external pull-up resistor and designed for wired-OR configurations. This dual-output architecture allows the ADM1232ARN-REEL to interface directly with diverse microprocessor reset inputs and shared system reset buses.
Is the ADM1232ARN-REEL RoHS compliant and what package does it use?
Yes, the ADM1232ARN-REEL is RoHS compliant (as indicated by the "Z" suffix in related variants like ADM1232ARNZ-REEL) and is supplied in an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and 5.00 × 3.96 mm body dimensions - optimized for automated assembly and space-constrained PCB layouts in the ADM1232ARN-REEL's target applications.
ADM1232ARN-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 250ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM1232ARN-REEL FAQ
1.How can I place an order for ADM1232ARN-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1232ARN-REEL 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 ADM1232ARN-REEL reliable?
The price and inventory of ADM1232ARN-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1232ARN-REEL is usually 5 days.
3.What payment methods are accepted for ADM1232ARN-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1232ARN-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1232ARN-REEL?
ADM1232ARN-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1232ARN-REEL 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 ADM1232ARN-REEL?
For technical support, including ADM1232ARN-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1232ARN-REEL requirements.
6.How does Aetrix verify that ADM1232ARN-REEL is sourced from the original manufacturer or authorized distributors?
All ADM1232ARN-REEL 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 ADM1232ARN-REEL meets industry standards.
7.What is the process for return or replacement of ADM1232ARN-REEL?
All ADM1232ARN-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1232ARN-REEL, 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 ADM1232ARN-REEL part is unused and in its original packaging.
Return procedure for ADM1232ARN-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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