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Analog Devices Inc./Maxim Integrated DS1232LPN
- Part No.:
- DS1232LPN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
DS1232LPN.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,781
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Product details
Overview
DS1232LPN from Maxim Integrated (formerly Dallas Semiconductor) is a low-power microprocessor supervisory IC that monitors VCC, implements watchdog timer functionality, and provides pushbutton reset control. It delivers 50 µA quiescent current, 250 ms minimum reset pulse width, and selectable 5% or 10% VCC trip thresholds (4.75 V or 4.5 V), used in embedded systems requiring reliable power-up/power-down sequencing and software fault recovery.
For engineers reviewing the DS1232LPN datasheet, DS1232LPN pinout, DS1232LPN application, or DS1232LPN equivalent, key selection considerations include its dual active-high/active-low RST outputs, TD-selectable watchdog timeout (150 ms / 600 ms / 1.2 s), TOL-configurable supply threshold, industrial temperature range (–40°C to +85°C), and 8-pin DIP package compatibility with legacy designs.
Technical Context
The DS1232LPN integrates three independent monitoring functions: precision VCC detection using a temperature-compensated bandgap reference and comparator, debounced pushbutton reset with guaranteed 250 ms active reset duration, and a non-disableable watchdog timer with TD-selectable timeouts (150 ms, 600 ms, or 1.2 s). All reset outputs remain active for ≥250 ms after VCC recovery.
Its dual RST outputs - one active-high CMOS, one active-low open-drain - support direct interfacing with diverse microprocessor reset inputs without external level-shifting. The ST input accepts TTL/CMOS-compatible strobe signals, and PBRST features internal 40 kΩ pull-up for simplified pushbutton interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 50 µA - enables battery-backed or ultra-low-power embedded systems with minimal standby drain |
| VCC Trip Threshold | 4.75 V (TOL = GND) or 4.5 V (TOL = VCC) - supports precise 5% or 10% supply tolerance monitoring |
| Reset Pulse Width | ≥250 ms - ensures sufficient time for microprocessor core and peripherals to fully initialize post-power-up |
| Watchdog Timeout Options | 150 ms / 600 ms / 1.2 s (TD = GND / float / VCC) - allows tuning to software execution loop timing |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade operation without derating |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard +5 V logic rails and marginal brown-out conditions |
| Reset Output Types | Active-high CMOS RST and active-low open-drain RST - supports both microcontroller reset pin types directly |
Pinout & Package
DS1232LPN is supplied in an 8-pin plastic DIP (300-mil) package, pin-compatible with industry-standard 8-pin DIP sockets and legacy DS1232 footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up to VCC (40 kΩ); debounced to generate ≥250 ms reset on button release |
| TD | Watchdog Timeout Select | Configures watchdog period: GND = 150 ms, float = 600 ms, VCC = 1.2 s; no disable option |
| TOL | Supply Threshold Select | GND = 4.75 V trip (5%), VCC = 4.5 V trip (10%); sets VCC comparator reference point |
| GND | Ground Reference | Primary return path for all internal circuits and output drivers |
| RST | Active-High Reset Output | CMOS-level output; drives high during reset assertion; requires no external pull-up |
| RST | Active-Low Reset Output | Open-drain output; requires external pull-up to VCC or another rail; supports wired-OR configurations |
| ST | Watchdog Strobe Input | High-to-low transition resets watchdog timer; must occur before timeout to prevent reset assertion |
| VCC | Power Supply Input | +5 V nominal supply (4.5–5.5 V); powers internal reference, comparators, and logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual RST outputs | Simultaneous active-high CMOS and active-low open-drain reset signals eliminate need for external inverters or level shifters |
| Guaranteed 250 ms reset pulse | Ensures robust microprocessor initialization across voltage ramp rates and board parasitics without external timing components |
| TD-selectable watchdog timeout | Three factory-trimmed timeout options allow matching to firmware loop timing without requalification or layout change |
| Internal 40 kΩ PBRST pull-up | Reduces BOM count by eliminating external pull-up resistor for pushbutton interface |
| Temperature-compensated VCC monitor | Maintains ±1.5% trip accuracy over –40°C to +85°C, ensuring consistent brown-out detection across operating environment |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Power cycling during field maintenance or transient line sags in factory-floor automation cabinets. IC Role / Device Role / Timing Role: Supervisory IC providing power-fail detection, hardware reset generation, and watchdog supervision of main MCU. Use Value: Prevents corrupted firmware execution during undervoltage events and guarantees safe restart after brown-out recovery. | Use Scenario: Battery-backed portable imaging unit requiring fail-safe boot integrity and long-term reliability. IC Role / Device Role / Timing Role: Low-power supervisor ensuring valid VCC before enabling ADC, display, and communication subsystems. Use Value: 50 µA quiescent current extends battery life; dual RST outputs interface directly with mixed-voltage SoC reset domains. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Unplanned AC loss followed by rapid restoration in retail environments with capacitive hold-up. IC Role / Device Role / Timing Role: MicroMonitor enforcing ≥250 ms reset hold time and detecting VCC sag below 4.75 V. Use Value: Eliminates boot-loop failures caused by insufficient power-rail stabilization during fast AC recovery. | Use Scenario: Tamper-resistant meter with firmware watchdog enforcement and supply monitoring under wide-temperature grid conditions. IC Role / Device Role / Timing Role: Industrial-grade supervisor asserting reset on VCC drop or software hang, with –40°C to +85°C operation. Use Value: TOL-selectable threshold and TD-configurable watchdog enable compliance with IEC 62056 and ANSI C12.20 reset timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692CPD+ | Higher quiescent current (120 µA), fixed 4.65 V reset threshold, no TOL select; includes manual reset but no PBRST debounce | Lacks programmable trip point and pushbutton debouncing; suited for simpler reset-only use cases | Choose MAX692CPD+ only if fixed threshold and absence of watchdog are acceptable |
| TPS3823-50DBVR | Single active-low reset output, 20 µA quiescent current, fixed 4.63 V threshold, no watchdog or PBRST | No watchdog or pushbutton support; optimized for ultra-low-power reset-only monitoring | Select TPS3823-50DBVR when minimal current draw is critical and watchdog/PBRST are unnecessary |
Compared with MAX692CPD+ and TPS3823-50DBVR, DS1232LPN uniquely combines ultra-low 50 µA supply current, dual RST outputs, TOL-selectable VCC threshold, and TD-configurable watchdog - making it the only option supporting full MicroMonitor functionality in legacy DIP-based industrial designs.
Availability
DS1232LPN is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, point-of-sale terminals, and smart energy meters requiring stable component supply and long-lifecycle support.
Supply support for DS1232LPN 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 (acquired by Analog Devices in 2021) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The DS1232LPN belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically for robust microprocessor system health monitoring in harsh, unattended, or safety-critical embedded environments.
FAQ
What is the function of the TOL pin on the DS1232LPN?
The TOL pin on the DS1232LPN selects the VCC trip threshold: connecting TOL to GND sets a 4.75 V threshold (5% tolerance), while connecting TOL to VCC sets a 4.5 V threshold (10% tolerance). This configuration determines the voltage at which the DS1232LPN asserts reset due to supply undervoltage, and is validated across the full –40°C to +85°C operating range.
Does the DS1232LPN provide both active-high and active-low reset outputs?
Yes, the DS1232LPN provides two independent reset outputs: RST (active-high CMOS) and RST (active-low open-drain). Both are asserted simultaneously during power failure, watchdog timeout, or pushbutton event. The open-drain RST requires an external pull-up, enabling wired-OR reset bus configurations in multi-IC systems using DS1232LPN.
How is the watchdog timeout configured on the DS1232LPN?
The watchdog timeout on the DS1232LPN is set via the TD pin: grounding TD yields ~150 ms, leaving TD floating yields ~600 ms, and connecting TD to VCC yields ~1.2 s. The watchdog cannot be disabled and must be strobed via the ST input at intervals less than the selected timeout to prevent reset assertion - a behavior confirmed in DS1232LPN's AC Electrical Characteristics table.
What package type is used for the DS1232LPN?
The DS1232LPN uses an 8-pin plastic DIP (dual in-line package) with 300-mil lead spacing. This package matches legacy DS1232 footprints and supports through-hole assembly. The 'N' suffix in DS1232LPN explicitly denotes the industrial-temperature-grade DIP variant, verified in Maxim's official marking and packaging documentation.
Is the DS1232LPN suitable for battery-powered applications?
Yes, the DS1232LPN is well-suited for battery-powered applications due to its 50 µA typical quiescent current, which minimizes standby power drain. Its guaranteed 250 ms reset pulse and dual-output architecture also ensure reliable startup and fault recovery in systems where battery voltage may sag near cutoff - a key design feature confirmed in the DS1232LPN's DC Electrical Characteristics table.
DS1232LPN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.37V, 4.62V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
DS1232LPN FAQ
1.How can I place an order for DS1232LPN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232LPN 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 DS1232LPN reliable?
The price and inventory of DS1232LPN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1232LPN is usually 5 days.
3.What payment methods are accepted for DS1232LPN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232LPN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232LPN?
DS1232LPN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232LPN 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 DS1232LPN?
For technical support, including DS1232LPN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232LPN requirements.
6.How does Aetrix verify that DS1232LPN is sourced from the original manufacturer or authorized distributors?
All DS1232LPN 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 DS1232LPN meets industry standards.
7.What is the process for return or replacement of DS1232LPN?
All DS1232LPN units undergo pre-shipment inspection (PSI). If there is an issue with DS1232LPN, 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 DS1232LPN part is unused and in its original packaging.
Return procedure for DS1232LPN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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