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Analog Devices Inc./Maxim Integrated DS1232LPS-2
- Part No.:
- DS1232LPS-2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1232LPS-2.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,316
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Product details
Overview
DS1232LPS-2 from Maxim Integrated (formerly Dallas Semiconductor) is a low-power microprocessor supervisory circuit in 8-pin SOIC (150-mil) package that monitors VCC, provides pushbutton reset with 250 ms debounce, and implements a selectable watchdog timer (150/600/1200 ms). It delivers active-high and open-drain active-low reset outputs for 5 V systems requiring reliable power-up/power-down sequencing in industrial control and embedded instrumentation.
For engineers reviewing the DS1232LPS-2 datasheet, DS1232LPS-2 pinout, DS1232LPS-2 application, or DS1232LPS-2 equivalent, key selection criteria include VCC trip accuracy (±5% or ±10% via TOL pin), quiescent current (50 µA), guaranteed 250 ms reset pulse width, and watchdog timeout configurability via TD pin-critical for fail-safe microcontroller operation in unattended systems.
Technical Context
The DS1232LPS-2 integrates three independent monitoring functions: precision VCC detection using a temperature-compensated bandgap reference and comparator, hardware-debounced pushbutton reset input (PBRST), and a programmable watchdog timer triggered by ST strobe pulses. All functions drive dual RST outputs-active-high CMOS and active-low open-drain-with synchronized 250 ms minimum assertion time.
Its power-monitoring logic asserts reset when VCC falls below 4.50 V (TOL = VCC) or 4.62 V (TOL = GND), and holds reset active for ≥250 ms after VCC recovery. The watchdog timeout is set by TD voltage level (GND/float/VCC), with typical values of 150 ms, 600 ms, and 1.2 s respectively-non-disableable and requiring periodic ST edge transitions to prevent timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Accuracy | ±5% (TOL=GND) or ±10% (TOL=VCC); ensures reliable reset at 4.62 V or 4.37 V nominal, preventing premature or delayed processor restart. |
| Quiescent Current | 50 µA typical; enables battery-backed or ultra-low-power embedded systems to maintain supervision without significant drain. |
| Reset Pulse Width | ≥250 ms minimum; guarantees sufficient time for power supply stabilization and microprocessor initialization on power-up or manual reset. |
| Watchdog Timeout Options | 150 ms / 600 ms / 1.2 s (TD=GND/float/VCC); allows tuning to software execution latency while preventing spurious resets. |
| Operating Temperature | 0°C to +70°C; validated for commercial-grade applications including test equipment and peripheral controllers. |
| Output Types | RST (CMOS active-high) and RST̅ (open-drain active-low); supports direct interface to both TTL/CMOS inputs and external pull-up configurations. |
Pinout & Package
DS1232LPS-2 is housed in an 8-pin SOIC package with 150-mil body width and standard JEDEC MS-012AC footprint. Pin spacing is 0.050 inch (1.27 mm), compatible with automated assembly and reflow profiles per IPC-J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low debounced input; generates ≥250 ms reset pulse on button release-eliminates need for external RC debounce network. |
| TD | Watchdog Timeout Select | Configures watchdog period: GND=150 ms, float=600 ms, VCC=1.2 s; no external components required. |
| TOL | VCC Threshold Select | Ground = 5% tolerance (4.62 V trip), VCC = 10% tolerance (4.37 V trip); sets reset activation point for varying supply stability requirements. |
| GND | Ground Reference | Primary return path for internal comparators, timers, and output drivers; must be low-impedance connection to system ground plane. |
| RST | Active-High Reset Output | CMOS-compatible output asserted high during fault conditions; directly drives microcontroller RESET# inputs requiring active-high assertion. |
| RST̅ | Active-Low Open-Drain Reset | Open-drain output requiring external pull-up; enables wired-OR reset bus sharing across multiple supervisors or logic families. |
| ST | Watchdog Strobe Input | Edge-triggered input; falling edge resets watchdog timer-must be pulsed at intervals less than selected timeout to prevent reset assertion. |
| VCC | +5 V Supply Input | Power rail monitored for undervoltage; also supplies internal circuitry; operates over 4.5–5.5 V range with 50 µA quiescent draw. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | Simultaneous active-high CMOS and active-low open-drain outputs simplify interface to diverse microcontroller reset architectures without level-shifting. |
| Programmable Watchdog Timeout | Three factory-set timeout options (150/600/1200 ms) selected solely by TD pin voltage-no external timing capacitors or resistors needed. |
| Hardware Pushbutton Debounce | Internal digital debounce eliminates mechanical bounce artifacts and guarantees ≥250 ms clean reset pulse-reduces BOM count and PCB area. |
| VCC Monitoring Accuracy | Temperature-compensated bandgap reference ensures ±5% or ±10% VCC trip point tolerance across full operating temperature range. |
Applications
| Industrial PLC I/O Module | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Microcontroller-based analog front-end and communication interface in DIN-rail mounted I/O modules subject to brownouts and EMI-induced lockups. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, watchdog timeout protection, and front-panel reset-ensuring deterministic recovery without operator intervention. Use Value: Prevents firmware corruption during line transients by asserting reset within 175 µs of VCC drop below threshold and holding it ≥250 ms for stable reboot. | Use Scenario: Embedded controller managing sensor calibration, display updates, and USB host communication in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-power supervisor enabling battery-backed operation while guaranteeing safe shutdown and restart during power cycling or software hangs. Use Value: 50 µA quiescent current extends battery life; dual RST outputs support both MCU reset and auxiliary logic reset sequencing in multi-voltage domains. |
| Test & Measurement Equipment | Point-of-Sale Terminal |
Use Scenario: Benchtop multimeter with real-time waveform capture and flash-based firmware storage vulnerable to power interruption during write cycles. IC Role / Device Role / Timing Role: Power-fail detector and watchdog coordinator-halting writes and asserting reset before VCC drops below safe retention level. Use Value: VCC trip point of 4.62 V (TOL=GND) aligns with NAND flash write voltage margin; 250 ms reset hold prevents partial writes and file system corruption. | Use Scenario: Retail terminal with touch interface, thermal printer, and Ethernet connectivity running Linux-based kiosk software prone to GUI freezes. IC Role / Device Role / Timing Role: Independent watchdog supervisor interfacing with main SoC's ST signal-forcing hard reset if application layer becomes unresponsive. Use Value: Configurable 600 ms watchdog timeout (TD=float) balances responsiveness to hang detection against tolerance for brief UI rendering delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692CPA+ | Higher quiescent current (120 µA), fixed 1.6 s watchdog, no TOL pin for VCC tolerance selection. | Lacks programmable trip accuracy; suited for simpler systems where 5% tolerance is not required. | Choose MAX692CPA+ only if fixed timeout and higher ICC are acceptable-and VCC monitoring tolerance flexibility is unnecessary. |
| TPS3823-50DBVR | Single active-low reset output, fixed 5.0 V threshold (±2%), 200 ms reset timeout, 15 µA ICC. | No pushbutton input or watchdog; optimized for basic power monitoring-not full supervisory functionality. | Select TPS3823-50DBVR when only VCC monitoring is needed and ultra-low ICC (15 µA) outweighs loss of watchdog and PBRST features. |
Compared with MAX692CPA+ and TPS3823-50DBVR, DS1232LPS-2 uniquely combines selectable VCC tolerance, dual reset outputs, hardware-debounced pushbutton, and programmable watchdog-all in a single 8-pin SOIC at 50 µA ICC-making it optimal for compact, feature-complete supervision where design flexibility matters.
Availability
DS1232LPS-2 is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, test equipment, and retail electronics requiring stable component supply, long-term lifecycle support, and verified commercial-temperature performance.
Supply support for DS1232LPS-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 (acquired by Analog Devices in 2021) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The DS1232LPS-2 belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically for robust, low-power microprocessor reset and watchdog control in cost-sensitive, space-constrained embedded systems.
FAQ
What is the function of the TOL pin on the DS1232LPS-2?
The TOL pin on the DS1232LPS-2 selects the VCC detection tolerance: connecting TOL to GND configures a ±5% trip point (4.62 V nominal), while connecting TOL to VCC sets a ±10% trip point (4.37 V nominal). This allows system designers to match the DS1232LPS-2's reset threshold to their power supply regulation tightness and noise margin requirements-ensuring DS1232LPS-2 asserts reset only when VCC deviation risks microprocessor instability.
Does the DS1232LPS-2 require external components to operate?
No, the DS1232LPS-2 operates autonomously with no external timing components. Its watchdog timeout is set solely by the TD pin voltage (GND/float/VCC), VCC threshold is selected via TOL, and pushbutton debounce is fully internal. Only standard decoupling (0.1 µF ceramic capacitor near VCC) and optional external pull-up on RST̅ are recommended-no resistors, capacitors, or crystals are required for core DS1232LPS-2 functionality.
Can the watchdog timer in the DS1232LPS-2 be disabled?
No, the watchdog timer in the DS1232LPS-2 cannot be disabled-it is always active once power is applied. To prevent unwanted reset assertion, the ST input must receive a high-to-low transition at least once per selected timeout interval (150/600/1200 ms). This design ensures fail-safe behavior: if firmware fails to strobe ST, DS1232LPS-2 forces reset, making DS1232LPS-2 appropriate for safety-critical or unattended operation.
What is the difference between the RST and RST̅ outputs of the DS1232LPS-2?
The DS1232LPS-2 provides two complementary reset outputs: RST is an active-high CMOS output capable of directly driving most microcontroller RESET# pins requiring high-level assertion, while RST̅ is an active-low open-drain output requiring an external pull-up resistor-enabling wired-OR connection with other reset sources or compatibility with legacy logic families. Both outputs are asserted simultaneously during any fault condition, giving designers interface flexibility without additional logic.
Is the DS1232LPS-2 suitable for industrial temperature applications?
The DS1232LPS-2 is specified for 0°C to +70°C operation per its datasheet. For industrial temperature range (-40°C to +85°C), the DS1232LPS-2N variant is required-identifiable by the "N" suffix and distinct marking ("DS1232L" with N-grade screening). Using the standard DS1232LPS-2 outside its rated temperature range may result in unreliable reset timing or trip point drift, so DS1232LPS-2N must be selected for extended-temperature deployments.
DS1232LPS-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS1232LPS-2 FAQ
1.How can I place an order for DS1232LPS-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232LPS-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 DS1232LPS-2 reliable?
The price and inventory of DS1232LPS-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1232LPS-2 is usually 5 days.
3.What payment methods are accepted for DS1232LPS-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232LPS-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232LPS-2?
DS1232LPS-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232LPS-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 DS1232LPS-2?
For technical support, including DS1232LPS-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232LPS-2 requirements.
6.How does Aetrix verify that DS1232LPS-2 is sourced from the original manufacturer or authorized distributors?
All DS1232LPS-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 DS1232LPS-2 meets industry standards.
7.What is the process for return or replacement of DS1232LPS-2?
All DS1232LPS-2 units undergo pre-shipment inspection (PSI). If there is an issue with DS1232LPS-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 DS1232LPS-2 part is unused and in its original packaging.
Return procedure for DS1232LPS-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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