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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:
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Product details
Overview
DS1232LPSN-2+T&R from Maxim Integrated (acquired by Analog Devices) is a low-power microprocessor supervisory IC that monitors VCC supply voltage, implements a watchdog timer, and debounces pushbutton reset - with 50 µA quiescent current, 4.5V/4.75V VCC trip points selectable via TOL pin, and dual active-high/active-low RST outputs. It is used in embedded systems requiring reliable power-up sequencing and 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 criteria include its 250 ms minimum reset pulse width, 150/600/1200 ms watchdog timeout options set by TD pin, industrial temperature range (–40°C to +85°C), dual RST outputs, 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 reference (±1.5% trip accuracy), a programmable watchdog timer with three timeout settings (150 ms, 600 ms, 1.2 s) controlled by TD pin logic state, and a debounced pushbutton reset input (PBRST) guaranteeing ≥250 ms active reset pulse on release.
It features dual complementary reset outputs - RST (active-high, push-pull) and RST̅ (active-low, open-drain) - enabling direct interface with both TTL and CMOS microprocessors; power-on reset assertion lasts ≥250 ms, and power-fail detection activates reset within 175 µs of VCC crossing threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 50 µA - enables battery-backed or ultra-low-power embedded systems without compromising supervision integrity |
| VCC Trip Point (TOL=GND) | 4.50–4.74 V - triggers reset when 5 V supply drops below 4.75 V ±5%, meeting standard 5 V microprocessor brown-out thresholds |
| VCC Trip Point (TOL=VCC) | 4.25–4.49 V - supports tighter 10% tolerance monitoring for legacy or noise-sensitive designs |
| Watchdog Timeout Options | 150 ms / 600 ms / 1.2 s - selected by grounding, floating, or tying TD to VCC; ensures flexible software execution timing validation |
| Reset Pulse Width | ≥250 ms - guarantees sufficient time for microprocessor core and peripherals to fully initialize after power-up or fault recovery |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade operation without derating or external thermal management |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V rail tolerances and avoids false triggering during nominal ripple |
Pinout & Package
DS1232LPSN-2+T&R is supplied in an 8-pin SOIC package (150-mil width, JEDEC MS-012), with lead finish matte tin and RoHS-compliant construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up; debounced with ≥250 ms reset pulse generated on release - eliminates mechanical switch bounce in manual reset paths |
| TD | Watchdog Timeout Select | Configures watchdog period: GND = ~150 ms, float = ~600 ms, VCC = ~1.2 s - enables single-pin programmability without external components |
| TOL | Supply Tolerance Select | Selects VCC trip threshold: GND = 4.75 V (5%), VCC = 4.5 V (10%) - adapts to system-level power rail stability requirements |
| GND | Ground Reference | Primary return path for internal comparators, watchdog timer, and output drivers - must be low-impedance to ensure accurate threshold detection |
| VCC | Power Supply Input | +5 V supply input (4.5–5.5 V); powers all internal circuitry and serves as reference for TOL and TD logic decisions |
| ST | Strobe Input | Active-low watchdog feed signal; high-to-low transition resets timeout counter - connects directly to microprocessor address/data/control lines |
| RST | Active-High Reset Output | Push-pull CMOS output; asserts high during reset condition - drives TTL/CMOS inputs without pull-up resistors |
| RST̅ | Active-Low Reset Output | Open-drain output; requires external pull-up; asserts low during reset - interfaces with legacy processors needing active-low reset |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | RST (push-pull, active-high) and RST̅ (open-drain, active-low) eliminate need for external level-shifting or inversion logic |
| Programmable watchdog timeout | Three factory-trimmed timeout options (150/600/1200 ms) selected solely by TD pin connection - no external RC network required |
| Adjustable VCC detection threshold | 5% or 10% tolerance selection via TOL pin simplifies design across varying power supply quality and aging margins |
| Guaranteed 250 ms reset pulse | Ensures robust processor initialization regardless of VCC ramp rate or PBRST contact bounce duration |
| Industrial temperature qualification | –40°C to +85°C operation validated per JEDEC JESD22-A108, supporting deployment in harsh environments without derating |
Applications
| Industrial PLC Control | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Microcontroller-based I/O modules in programmable logic controllers experience voltage sags during relay switching or EMI events. IC Role / Device Role / Timing Role: DS1232LPSN-2+T&R monitors 5 V rail and asserts RST/RST̅ within 175 µs if VCC falls below 4.75 V, halting unsafe execution and forcing safe restart. Use Value: Prevents corrupted I/O state or spurious actuator commands during transient brownouts, improving functional safety compliance. | Use Scenario: Portable ultrasound units powered by Li-ion batteries require reliable boot-up and crash recovery under variable load conditions. IC Role / Device Role / Timing Role: DS1232LPSN-2+T&R provides 250 ms power-on reset and 600 ms watchdog timeout, ensuring FPGA and ARM Cortex-M4 initialize fully before data acquisition begins. Use Value: Eliminates boot failures due to marginal VCC ramp rates and prevents silent firmware hangs during long imaging sessions. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: BCM microcontrollers manage door locks, lighting, and HVAC; subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: DS1232LPSN-2+T&R uses TOL=VCC to lower trip point to 4.5 V, allowing continued operation during 12 V system dips to 9 V while still detecting true failure. Use Value: Reduces nuisance resets during engine cranking, increasing system uptime and user experience reliability. | Use Scenario: Revenue-grade electricity meters operate unattended for 15+ years and must survive grid surges, lightning-induced transients, and capacitor aging. IC Role / Device Role / Timing Role: DS1232LPSN-2+T&R's 50 µA quiescent current and –40°C to +85°C rating enable always-on supervision without battery drain or thermal drift issues. Use Value: Ensures meter firmware remains recoverable over full product lifetime, meeting IEC 62053-21 tamper-resistance and data integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+ | Single active-low reset output; fixed 2.93 V threshold; no watchdog or pushbutton debounce | Lacks watchdog and PBRST functionality - suitable only for basic power-monitoring-only use cases | Choose when only brown-out detection is needed and board space is constrained |
| TPS3808G12DBVR | Adjustable reset threshold (0.4–5 V); 200 ms min reset pulse; no dual RST outputs; watchdog optional via external timer | Requires external components for watchdog implementation; lacks native pushbutton debounce and complementary outputs | Prefer when precise threshold tuning or extended voltage range (down to 0.4 V) is required |
Compared with MAX6326US29D3+ and TPS3808G12DBVR, DS1232LPSN-2+T&R uniquely integrates dual-reset outputs, hardware-debounced pushbutton support, and a 3-option watchdog - all in one SOIC-8 footprint - reducing BOM count and PCB complexity for industrial microcontroller systems.
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 assurance, and guaranteed traceable sourcing.
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
Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and healthcare applications - with emphasis on reliability, longevity, and specification rigor.
The DS1232LPSN-2+T&R belongs to Maxim's MicroMonitor™ family, engineered specifically for fail-safe microprocessor supervision in mission-critical embedded systems where deterministic reset behavior and low-power operation are mandatory.
FAQ
What is the function of the TOL pin on DS1232LPSN-2+T&R?
The TOL pin on DS1232LPSN-2+T&R selects the VCC detection tolerance: when tied to GND, it sets a 5% threshold (4.75 V for 5 V supply); when tied to VCC, it sets a 10% threshold (4.5 V). This allows system designers to match the reset trigger point to actual power rail stability and aging margins without changing the DS1232LPSN-2+T&R part number or layout.
Does DS1232LPSN-2+T&R support both active-high and active-low reset signaling?
Yes, DS1232LPSN-2+T&R provides two independent reset outputs: RST (active-high, push-pull) and RST̅ (active-low, open-drain). This dual-output architecture enables direct interface with diverse microprocessors - including legacy devices requiring active-low reset and modern SoCs preferring active-high - without external inverters or pull-up resistors on RST̅.
How is the watchdog timeout configured on DS1232LPSN-2+T&R?
The watchdog timeout on DS1232LPSN-2+T&R is set by the TD pin: grounding TD yields ~150 ms, leaving TD floating yields ~600 ms, and connecting TD to VCC yields ~1.2 s. The DS1232LPSN-2+T&R does not support disabling the watchdog - it must be strobed via the ST pin at intervals less than the selected timeout to prevent unintended reset assertion.
What is the minimum reset pulse width guaranteed by DS1232LPSN-2+T&R?
DS1232LPSN-2+T&R guarantees a minimum reset pulse width of 250 ms for both RST and RST̅ outputs during power-up, power-down, and pushbutton-initiated reset events. This duration is factory-trimmed and specified across temperature and supply voltage, ensuring reliable microprocessor initialization even under worst-case VCC ramp conditions.
Is DS1232LPSN-2+T&R qualified for industrial temperature operation?
Yes, DS1232LPSN-2+T&R is rated for industrial temperature operation from –40°C to +85°C, as indicated by the "N" suffix in the part number. This qualification is verified per JEDEC standards and applies to all electrical specifications in the datasheet - making DS1232LPSN-2+T&R suitable for deployment in factory automation, outdoor infrastructure, and other thermally demanding environments.
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:
- Active
- 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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