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Analog Devices Inc./Maxim Integrated DS1232LPSN-2
- Part No.:
- DS1232LPSN-2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1232LPSN-2.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,192
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Product details
Overview
DS1232LPSN-2 from Maxim Integrated (formerly Dallas Semiconductor) is a low-power microprocessor supervisory IC that monitors VCC supply voltage, implements a watchdog timer, and provides pushbutton reset control. It delivers 50 µA quiescent current, supports 5% or 10% VCC threshold detection via TOL pin, and guarantees ≥250 ms active reset pulse width. Used in embedded systems requiring reliable power-up/power-down sequencing and software fault recovery.
For engineers reviewing the DS1232LPSN-2 datasheet, DS1232LPSN-2 pinout, DS1232LPSN-2 application, or DS1232LPSN-2 equivalent, key selection criteria include its dual RST/RST outputs (active-high and open-drain active-low), selectable watchdog timeout (150 ms/600 ms/1.2 s), industrial temperature range (–40°C to +85°C), and SOIC-8 (150-mil) package compatibility.
Technical Context
The DS1232LPSN-2 integrates three independent monitoring functions: precision VCC comparator with temperature-compensated reference, debounced pushbutton reset input (PBRST), and programmable watchdog timer triggered by ST strobe. Its dual-reset outputs support both CMOS and TTL-compatible reset assertion.
VCC detection thresholds are configurable: 4.50–4.74 V (TOL = GND, ±5%) or 4.25–4.49 V (TOL = VCC, ±10%). Watchdog timeout is set by TD pin state (GND/float/VCC), with typical values of 150 ms, 600 ms, and 1.2 s respectively - all guaranteed minimum 250 ms reset hold time after timeout or power event.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 50 µA - enables battery-backed or ultra-low-power embedded systems without compromising supervision reliability. |
| VCC Detection Accuracy | ±5% (TOL=GND) or ±10% (TOL=VCC) - ensures precise power-fail warning before microprocessor operation becomes unstable. |
| Reset Pulse Width | ≥250 ms - guarantees sufficient time for power supply stabilization and processor core initialization during power-up or recovery. |
| Watchdog Timeout Options | 150 ms / 600 ms / 1.2 s - selectable via TD pin, supporting diverse firmware execution timing margins across applications. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments where thermal stress affects system uptime and reset integrity. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard +5 V logic rails and tolerant of nominal 5% regulation variation. |
Pinout & Package
DS1232LPSN-2 is housed in an 8-pin SOIC package (150-mil width), with gull-wing leads and JEDEC MS-012AC outline. Pin pitch is 1.27 mm; body dimensions are 3.9 mm × 4.9 mm × 1.75 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up; debounced to generate ≥250 ms reset pulse 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 firmware timing margin tuning without external components. |
| TOL | VCC Threshold Select | GND = 4.50–4.74 V trip (±5%), VCC = 4.25–4.49 V trip (±10%) - allows system-level trade-off between early warning and brown-out resilience. |
| GND | Ground Reference | Primary return path for internal comparators, watchdog logic, and output drivers - must be low-impedance to ensure noise-immune reset assertion. |
| RST | Active-High Reset Output | CMOS-compatible push-pull output - directly drives reset inputs of most 5 V microcontrollers without pull-up resistors. |
| RST | Active-Low Reset Output | Open-drain, requires external pull-up - supports wired-OR reset buses and mixed-voltage interface domains. |
| ST | Strobe Input | High-to-low transition resets watchdog timer; must occur at least once per timeout interval - prevents spurious resets during normal firmware execution. |
| VCC | Power Supply Input | +5 V supply rail (4.5–5.5 V); powers internal reference, comparators, and logic - also serves as voltage monitor input source. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST (push-pull, active-high) and RST (open-drain, active-low) enable flexible interfacing with diverse MCU reset architectures and bus topologies. |
| Programmable watchdog timeout | Three factory-trimmed intervals (150 ms/600 ms/1.2 s) selected by TD pin state - eliminates need for external RC timing networks or configuration fuses. |
| Temperature-compensated VCC monitor | Internal bandgap reference and comparator maintain ±5% or ±10% trip accuracy over –40°C to +85°C - ensures consistent brown-out detection across operating conditions. |
| Debounced pushbutton input | PBRST pin includes hardware debounce and fixed 250 ms minimum reset pulse - removes requirement for external RC filters or firmware debouncing routines. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating in factory-floor environments with voltage fluctuations and EMI. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brown-out detection, and watchdog-triggered recovery from firmware lockup. Use Value: Prevents erratic I/O behavior during line sags by asserting reset before VCC drops below 4.5 V (TOL=GND), while 600 ms watchdog timeout accommodates deterministic scan-cycle timing. | Use Scenario: Portable ultrasound imaging unit powered by rechargeable Li-ion battery with regulated 5 V rail. IC Role / Device Role / Timing Role: Ensures safe shutdown and restart sequence during battery voltage decay, using dual RST outputs to coordinate FPGA and ARM Cortex-M reset domains. Use Value: 50 µA quiescent current extends standby time; 1.2 s watchdog timeout aligns with firmware health-check intervals without false triggers during image processing bursts. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Credit card reader with EEPROM data logging, exposed to frequent AC power cycling and user-initiated resets. IC Role / Device Role / Timing Role: Manages clean power-up sequencing and provides hardware-debounced front-panel reset via PBRST pin. Use Value: Guaranteed ≥250 ms reset pulse ensures EEPROM write completion before MCU restart; open-drain RST supports shared reset bus with secure element IC. | Use Scenario: DIN-rail mounted electricity meter subject to grid transients and long-term thermal aging. IC Role / Device Role / Timing Role: Monitors 5 V supply derived from isolated DC-DC converter; detects undervoltage events before metrology ADC sampling degrades. Use Value: ±5% VCC threshold (TOL=GND) triggers reset at 4.75 V - avoids false trips during nominal 4.85 V operation while catching true brown-outs below 4.70 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT46D3+ | Single active-low open-drain reset; no active-high RST output; fixed 4.63 V threshold; 1.6 µA quiescent current. | Lacks dual-reset flexibility and programmable watchdog; suited for space-constrained, ultra-low-IQ designs where only one reset polarity is needed. | Select MAX6326UT46D3+ when minimizing supply current is critical and system uses only open-drain reset signaling. |
| TPS3823-50DBVR | Fixed 4.63 V threshold; watchdog timeout fixed at 200 ms; 15 µA quiescent current; no TOL pin for threshold selection. | No VCC tolerance adjustment or multi-interval watchdog; optimized for cost-sensitive consumer electronics with predictable firmware timing. | Select TPS3823-50DBVR when design requires minimal BOM count, fixed timing, and TI supply chain alignment. |
Compared with DS1232LPSN-2, MAX6326UT46D3+ offers lower IQ but sacrifices dual-reset capability and watchdog configurability, while TPS3823-50DBVR reduces cost and size but eliminates threshold and timeout flexibility - making DS1232LPSN-2 optimal for industrial designs needing field-tunable supervision parameters.
Availability
DS1232LPSN-2 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, point-of-sale terminals, and smart metering applications requiring stable component supply, long lifecycle support, and guaranteed industrial temperature performance.
Supply support for DS1232LPSN-2 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, designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The DS1232LPSN-2 belongs to Maxim's MicroMonitor™ supervisory IC family, engineered specifically for robust microprocessor reset and watchdog functionality in harsh, thermally variable environments.
FAQ
What is the function of the TOL pin on the DS1232LPSN-2?
The TOL pin on the DS1232LPSN-2 selects the VCC detection threshold tolerance: grounded for ±5% (4.50–4.74 V trip), or tied to VCC for ±10% (4.25–4.49 V trip). This allows system designers to balance early brown-out warning against immunity to transient dips. The DS1232LPSN-2 uses this pin to configure its internal comparator reference without external components, ensuring repeatable power-monitoring behavior across units and temperatures.
Does the DS1232LPSN-2 require external components to operate as a watchdog timer?
No, the DS1232LPSN-2 implements a fully self-contained watchdog timer requiring only the ST strobe input signal from the host microcontroller. Timeout duration (150 ms/600 ms/1.2 s) is selected solely by the TD pin state - no external capacitors or resistors are needed. The DS1232LPSN-2 internally generates and manages the timing, guaranteeing minimum reset pulse width and automatic restart after timeout, simplifying PCB layout and reducing BOM count.
How does the DS1232LPSN-2 handle reset assertion during power-up and power-down?
During power-up, the DS1232LPSN-2 holds both RST and RST active for ≥250 ms after VCC exceeds the trip threshold, ensuring stable supply and processor clock before release. During power-down, it asserts reset when VCC falls below the configured threshold and maintains it until VCC drops below 2.0 V. This behavior is built into the DS1232LPSN-2's comparator and timing circuitry, eliminating need for external RC networks to shape reset timing.
Can the DS1232LPSN-2 be used with 3.3 V microcontrollers?
The DS1232LPSN-2 is specified for 4.5–5.5 V operation and is not rated for direct 3.3 V supply. Its RST output is CMOS-compatible with 5 V rails, and RST open-drain output requires a 3.3 V pull-up if interfacing with 3.3 V logic - but VCC must remain at 5 V. Using DS1232LPSN-2 with a 3.3 V MCU is possible only if the system maintains a dedicated 5 V rail for the DS1232LPSN-2 and level-shifts reset signals, as the DS1232LPSN-2 itself cannot operate from 3.3 V.
What is the significance of having both RST and RST outputs on the DS1232LPSN-2?
The dual RST (active-high push-pull) and RST (active-low open-drain) outputs on the DS1232LPSN-2 provide hardware-level flexibility for interfacing with heterogeneous reset architectures: RST directly drives most 5 V microcontrollers, while RST supports wired-OR configurations, mixed-voltage domains, and legacy peripherals requiring active-low assertion. This eliminates external logic or level translators in complex systems - a key differentiator of the DS1232LPSN-2 versus single-output supervisors.
DS1232LPSN-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS1232LPSN-2 FAQ
1.How can I place an order for DS1232LPSN-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232LPSN-2 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 reliable?
The price and inventory of DS1232LPSN-2 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 is usually 5 days.
3.What payment methods are accepted for DS1232LPSN-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232LPSN-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232LPSN-2?
DS1232LPSN-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232LPSN-2 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?
For technical support, including DS1232LPSN-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232LPSN-2 requirements.
6.How does Aetrix verify that DS1232LPSN-2 is sourced from the original manufacturer or authorized distributors?
All DS1232LPSN-2 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 meets industry standards.
7.What is the process for return or replacement of DS1232LPSN-2?
All DS1232LPSN-2 units undergo pre-shipment inspection (PSI). If there is an issue with DS1232LPSN-2, 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 part is unused and in its original packaging.
Return procedure for DS1232LPSN-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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