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Analog Devices Inc./Maxim Integrated DS1232LPSN-2/T&R
- Part No.:
- DS1232LPSN-2/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1232LPSN-2/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,636
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Product details
Overview
DS1232LPSN-2/T&R from Maxim Integrated (formerly Dallas Semiconductor) is a low-power microprocessor supervisory IC that monitors VCC, implements watchdog timer functionality, and manages pushbutton reset with 250 ms minimum active reset pulse width; features dual RST outputs (active-high and open-drain active-low), 50 µA quiescent current, and 5% or 10% VCC threshold selection via TOL pin; used in embedded microcontroller systems requiring reliable power-up/power-down sequencing and software fault recovery.
For engineers reviewing the DS1232LPSN-2/T&R datasheet, DS1232LPSN-2/T&R pinout, DS1232LPSN-2/T&R application, or DS1232LPSN-2/T&R equivalent, key selection considerations include VCC trip point tolerance (4.50–4.74 V at TOL=GND), watchdog timeout options (150/600/1200 ms), dual-reset output drive capability, industrial temperature range (−40°C to +85°C), and SOIC-8 (150-mil) package compatibility.
Technical Context
The DS1232LPSN-2/T&R integrates three independent monitoring functions: precision VCC detection using a temperature-compensated bandgap reference and comparator, debounced pushbutton reset with guaranteed 250 ms active pulse, and a programmable watchdog timer with three timeout settings selected by TD pin state (GND/float/VCC). It operates across 4.5 V to 5.5 V supply and maintains reset assertion for ≥250 ms after power-up or power-fail recovery.
Its dual RST outputs serve complementary interface needs: RST (active-high CMOS) drives logic-high reset directly, while RST (open-drain active-low) supports wired-OR configurations and level-shifting; both outputs remain asserted during VCC undervoltage, power-down, and watchdog timeout events, ensuring deterministic processor halt and restart behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point (TOL=GND) | 4.50–4.74 V - sets precise 5% VCC monitor threshold for +5 V nominal supply |
| Quiescent Current | 50 µA - enables battery-backed or ultra-low-power embedded operation |
| Reset Pulse Width | ≥250 ms - ensures full microprocessor initialization and clock stabilization |
| Watchdog Timeout Options | 150 ms / 600 ms / 1.2 s - selectable via TD pin connection, prevents runaway code execution |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded environments |
| Output Types | RST (CMOS active-high), RST (open-drain active-low) - supports mixed-logic and bus-shared reset schemes |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V microcontroller rails |
Pinout & Package
DS1232LPSN-2/T&R is housed in an 8-pin SOIC package (150-mil width), with pin 1 marked by notch or dot. The package is RoHS-compliant and designed for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up; debounced input triggering ≥250 ms reset pulse on release |
| TD | Watchdog Time Delay Select | Configures watchdog timeout: GND=150 ms, float=600 ms, VCC=1.2 s |
| TOL | VCC Threshold Select | GND selects 4.50–4.74 V (5%); VCC selects 4.25–4.49 V (10%) trip point |
| GND | Ground Reference | System ground return for all internal comparators, timers, and outputs |
| VCC | +5 V Power Supply | Primary power input; monitored for undervoltage and used as reference for I/O levels |
| ST | Strobe Input | High-to-low transition resets watchdog timer; must be strobed before timeout to prevent reset |
| RST | Active-High Reset Output | CMOS-compatible, driven high during reset; requires no external pull-up |
| RST | Active-Low Open-Drain Reset Output | Must be externally pulled up; enables wired-OR reset buses and voltage-level translation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST (CMOS active-high) and RST (open-drain active-low) provide flexible interface options for diverse MCU reset architectures |
| Programmable watchdog timeout | Three factory-trimmed intervals (150/600/1200 ms) selected without external components via TD pin state |
| Adjustable VCC monitor threshold | 5% or 10% tolerance selection via single TOL pin connection - eliminates need for external resistor dividers |
| Guaranteed power-on reset timing | ≥250 ms reset assertion after VCC rise ensures stable clock and memory initialization before CPU release |
| Industrial temperature rating | −40°C to +85°C operation validated per datasheet - suitable for uncontrolled ambient deployments |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating in factory-floor environments with variable line voltage and EMI exposure. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, hardware watchdog, and manual reset - ensures deterministic recovery from brownouts or software hangs. Use Value: Prevents corrupted I/O states and unsafe actuator commands by forcing controlled reboot within 250 ms of fault detection. | Use Scenario: Portable ultrasound or patient monitor with battery backup and strict regulatory uptime requirements. IC Role / Device Role / Timing Role: Power supervisor and watchdog enforcing safe boot sequence and runtime integrity checks during clinical operation. Use Value: Guarantees system reset before VCC drops below 4.5 V (TOL=GND), preserving data integrity and meeting IEC 62304 safety-critical timing constraints. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Non-safety-critical vehicle subsystem (e.g., lighting or HVAC control) powered from switched 5 V rail subject to load dump transients. IC Role / Device Role / Timing Role: Resets microcontroller upon detected VCC sag or watchdog timeout caused by transient-induced firmware lockup. Use Value: Dual RST outputs allow simultaneous reset of main MCU and companion CAN transceiver using shared reset net. | Use Scenario: ANSI C12.20-certified electricity meter with tamper-detection logic and long-life lithium backup. IC Role / Device Role / Timing Role: Low-power (50 µA) supervisor enabling >10-year battery life while maintaining reliable power-fail detection and reset coordination. Use Value: Enables accurate last-read storage and secure shutdown before VCC decay compromises EEPROM write integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | Single active-low reset output; fixed 1.6 s watchdog; no TOL-selectable VCC threshold | Lacks dual-reset flexibility and adjustable trip point; requires external resistor for threshold tuning | Choose when only one reset polarity is needed and fixed watchdog interval suffices |
| TPS3823-50DBVR | Single active-low reset; fixed 5% VCC threshold at 5.0 V; 200 ms reset timeout; 12 µA quiescent current | Lower IQ but no pushbutton reset or programmable watchdog; no active-high output | Prefer for ultra-low-power battery systems where pushbutton override and dual outputs are unnecessary |
Compared with MAX692AESA+ and TPS3823-50DBVR, DS1232LPSN-2/T&R uniquely delivers dual-polarity reset outputs, user-selectable VCC trip tolerance, and three-programmable watchdog timeouts - all in a single 8-pin SOIC without external components, making it optimal for space-constrained industrial controllers requiring field-serviceable reset initiation.
Availability
DS1232LPSN-2/T&R is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for DS1232LPSN-2/T&R 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, medical, and communications applications.
The DS1232LPSN-2/T&R belongs to Maxim's MicroMonitor™ supervisory IC family, engineered specifically for robust microprocessor reset and watchdog control in harsh, unattended embedded systems.
FAQ
What is the function of the TOL pin on the DS1232LPSN-2/T&R?
The TOL pin on the DS1232LPSN-2/T&R selects the VCC monitor threshold tolerance: connecting TOL to GND configures a 5% trip point (4.50–4.74 V), while connecting it to VCC selects a 10% trip point (4.25–4.49 V). This eliminates external resistor networks and allows field-configurable power-supply monitoring sensitivity without changing the DS1232LPSN-2/T&R footprint or bill of materials.
Does the DS1232LPSN-2/T&R support both active-high and active-low reset signaling?
Yes, the DS1232LPSN-2/T&R provides two independent reset outputs: RST is a CMOS active-high output, and RST is an open-drain active-low output. This dual-output architecture enables direct interfacing with MCUs requiring either polarity, supports wired-OR reset busing, and simplifies integration into mixed-voltage or legacy systems without additional level-shifting circuitry.
How does the watchdog timer on the DS1232LPSN-2/T&R operate?
The DS1232LPSN-2/T&R watchdog timer forces reset if the ST input is not strobed low before timeout. Timeout duration is set by the TD pin: 150 ms (TD=GND), 600 ms (TD floating), or 1.2 s (TD=VCC). A high-to-low ST transition resets the timer; failure to strobe results in ≥250 ms reset assertion on both RST outputs, ensuring recovery from software hangs.
What is the quiescent current consumption of the DS1232LPSN-2/T&R?
The DS1232LPSN-2/T&R draws 50 µA typical quiescent current under normal operation (VCC = 5 V, no reset asserted). This ultra-low power draw makes it suitable for battery-backed or energy-harvesting systems where standby current directly impacts operational lifetime - significantly lower than standard supervisory ICs like the MAX692AESA+ (15 µA) or TPS3823-50DBVR (12 µA), though those lack DS1232LPSN-2/T&R's feature set.
Is the DS1232LPSN-2/T&R rated for industrial temperature operation?
Yes, the DS1232LPSN-2/T&R is specified for −40°C to +85°C operation, as indicated by the "N" suffix in its part number. This industrial temperature grade is validated per datasheet absolute maximum and DC operating conditions, ensuring reliable VCC monitoring, watchdog timing, and reset generation across extended thermal ranges encountered in factory automation, outdoor metering, and transportation electronics.
DS1232LPSN-2/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS1232LPSN-2/T&R FAQ
1.How can I place an order for DS1232LPSN-2/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232LPSN-2/T&R 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 DS1232LPSN-2/T&R reliable?
The price and inventory of DS1232LPSN-2/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1232LPSN-2/T&R is usually 5 days.
3.What payment methods are accepted for DS1232LPSN-2/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232LPSN-2/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232LPSN-2/T&R?
DS1232LPSN-2/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232LPSN-2/T&R 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 DS1232LPSN-2/T&R?
For technical support, including DS1232LPSN-2/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232LPSN-2/T&R requirements.
6.How does Aetrix verify that DS1232LPSN-2/T&R is sourced from the original manufacturer or authorized distributors?
All DS1232LPSN-2/T&R 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 DS1232LPSN-2/T&R meets industry standards.
7.What is the process for return or replacement of DS1232LPSN-2/T&R?
All DS1232LPSN-2/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1232LPSN-2/T&R, 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 DS1232LPSN-2/T&R part is unused and in its original packaging.
Return procedure for DS1232LPSN-2/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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