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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:3,666
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Product details
Overview
DS1232LPS-2+ from Maxim Integrated (formerly Dallas Semiconductor) is a low-power microprocessor supervisory IC that monitors VCC supply voltage, implements a watchdog timer, and manages pushbutton reset-featuring 50 µA quiescent current, dual active-high/active-low RST outputs, and 250 ms minimum reset pulse width. It supports industrial temperature range (–40°C to +85°C) and is used in embedded controllers where reliable power-up sequencing and software fault recovery are critical.
For engineers reviewing the DS1232LPS-2+ datasheet, DS1232LPS-2+ pinout, DS1232LPS-2+ application, or DS1232LPS-2+ equivalent, key selection considerations include its dual-reset output configuration, selectable VCC trip tolerance (4.5 V or 4.75 V), programmable watchdog timeout (150 ms / 600 ms / 1.2 s), and 8-pin SOIC (150-mil) package compatibility with legacy DS1232 designs.
Technical Context
The DS1232LPS-2+ integrates three independent monitoring functions: precision VCC detection using a temperature-compensated bandgap reference and comparator, a debounced pushbutton reset input (PBRST) that guarantees ≥250 ms active reset on release, and a non-disableable watchdog timer triggered by ST strobe edges with timeout set via TD pin (GND/float/VCC).
Its dual RST outputs-RST (active-high CMOS) and RST̅ (active-low open-drain)-enable direct interfacing with both TTL/CMOS processors and external pull-up/down requirements. Power-fail detection initiates reset when VCC drops below 4.5 V (TOL = VCC) or 4.75 V (TOL = GND), and reset remains asserted for ≥250 ms after VCC recovery to ensure processor stabilization.
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 Trip Point | 4.50 V (min) at TOL = VCC or 4.50 V (min) at TOL = GND - ensures reset activation before microprocessor brownout |
| Reset Pulse Width | ≥250 ms - provides sufficient time for power rail settling and CPU core initialization |
| Watchdog Timeout Options | 150 ms (TD = GND), 600 ms (TD = float), 1.2 s (TD = VCC) - allows tuning to firmware execution cycle margins |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control environments |
| Package | 8-pin SOIC (150-mil) - surface-mount compatible with automated PCB assembly and space-constrained layouts |
| Reset Outputs | RST (CMOS active-high), RST̅ (open-drain active-low) - supports mixed-logic-level host interfaces without external level shifters |
Pinout & Package
DS1232LPS-2+ is housed in an 8-pin SOIC package (150-mil body width, JEDEC MS-012AC), with gull-wing leads and standard 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up; 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 |
| TOL | VCC Threshold Select | GND → 4.75 V trip, VCC → 4.5 V trip - sets supply fault detection sensitivity |
| GND | Ground Reference | Primary return path for internal comparators, timer, and I/O drivers |
| VCC | +5 V Supply Input | Power source for internal circuitry; monitored for out-of-tolerance conditions |
| ST | Strobe Input | High-to-low edge resets watchdog timer; must be toggled within selected timeout window |
| RST | Active-High Reset Output | CMOS-compatible, driven high during reset assertion; requires no external pull-up |
| RST̅ | Active-Low Reset Output | Open-drain, requires external pull-up; enables wired-OR reset bus or mixed-voltage logic interface |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST (CMOS active-high) and RST̅ (open-drain active-low) eliminate need for external inverters or level translators |
| Programmable watchdog timeout | Three factory-set intervals via single TD pin connection - avoids trimming resistors or external timing components |
| VCC threshold select via TOL pin | Hardware-selectable 4.5 V or 4.75 V trip point - matches common 5 V system tolerances without external feedback networks |
| Guaranteed 250 ms reset pulse | Internally timed on power-up, power-down, and PBRST release - ensures deterministic processor initialization |
| Industrial temperature rating | –40°C to +85°C operation - validated across full range without derating or thermal compensation circuits |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Microcontroller-based logic sequencer in programmable logic controller rack modules exposed to variable line voltage and ambient temperature swings. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, hardware watchdog, and front-panel reset - ensuring deterministic restart after brownout or firmware hang. Use Value: Prevents corrupted I/O state or unsafe actuator positioning by enforcing full reset before resuming control loop execution. | Use Scenario: Portable ultrasound imaging device with battery backup and real-time signal processing firmware. IC Role / Device Role / Timing Role: Low-power supervisor maintaining system integrity during battery switchover and intermittent power loss. Use Value: 50 µA quiescent current extends battery life while guaranteeing safe shutdown and clean restart upon power restoration. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: ANSI C12.20-compliant electricity meter with tamper-detection firmware and EEPROM data logging. IC Role / Device Role / Timing Role: Power supervisor and watchdog enforcing valid boot sequence and preventing unauthorized firmware execution during voltage transients. Use Value: Dual RST outputs enable simultaneous reset of MCU and isolated communication ICs (e.g., RS-485 transceiver) without timing skew. | Use Scenario: CAN-connected door module managing window lift, mirror fold, and interior lighting under load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Voltage monitor and watchdog ensuring microcontroller reset during 6 V cold-crank or 40 V load dump events. Use Value: 4.5 V trip point (TOL = VCC) triggers reset before microcontroller enters undefined state, preserving EEPROM calibration data. |
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 4.65 V trip; no TOL pin; 1.6 µA quiescent current | Lacks dual-reset outputs and programmable watchdog; better suited for ultra-low-power sleep-mode monitoring only | Select when minimal current draw dominates over flexible reset signaling and watchdog configurability |
| TPS3823-50DBVR | Single active-low reset; fixed 4.63 V trip; no pushbutton input or watchdog; 15 µA quiescent current | No PBRST or ST functionality; designed for basic power-good monitoring only | Select when only VCC supervision is required and external reset logic handles pushbutton/watchdog duties |
Compared with MAX692AESA+ and TPS3823-50DBVR, DS1232LPS-2+ uniquely delivers dual-reset signaling, hardware-programmable watchdog timeout, and integrated pushbutton debounce in one 8-pin SOIC - making it optimal for cost-sensitive industrial controllers needing full supervision without external support components.
Availability
DS1232LPS-2+ is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply across extended product lifecycles.
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, medical, and communications applications.
The DS1232LPS-2+ belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically for robust microprocessor reset and watchdog functionality in harsh, unattended embedded environments.
FAQ
What is the function of the TOL pin on the DS1232LPS-2+?
The TOL pin on the DS1232LPS-2+ selects the VCC trip voltage threshold: when tied to GND, DS1232LPS-2+ asserts reset at 4.75 V; when tied to VCC, it trips at 4.5 V. This hardware-selectable option eliminates external resistor dividers and allows matching to different 5 V system tolerances without redesigning the feedback network.
Does the DS1232LPS-2+ support watchdog timer disable?
No, the DS1232LPS-2+ watchdog timer cannot be disabled. It must be strobed via the ST input at intervals shorter than the selected timeout (150 ms / 600 ms / 1.2 s) to prevent automatic reset assertion. This design ensures fail-safe behavior - if firmware hangs or fails to service the watchdog, DS1232LPS-2+ forces a controlled restart.
How does the DS1232LPS-2+ handle power-up reset timing?
On power-up, the DS1232LPS-2+ holds both RST and RST̅ active for a minimum of 250 ms after VCC rises above the selected trip threshold. This guaranteed minimum duration ensures stable power rails and microprocessor clock startup before releasing reset - critical for reliable boot in systems with slow-rising supplies or large decoupling capacitance.
Can the DS1232LPS-2+ replace the original DS1232 in existing designs?
Yes, DS1232LPS-2+ is pin-compatible with the DS1232 in 8-pin SOIC packages and shares identical pinout, electrical behavior, and functional scope. Key improvements include 50 µA quiescent current (vs. ~1 mA for DS1232) and enhanced industrial temperature qualification - enabling drop-in upgrade in legacy systems seeking lower power and broader operating range.
What is the maximum sink current capability of the RST̅ output on the DS1232LPS-2+?
The RST̅ output on the DS1232LPS-2+ is an open-drain driver rated for 10 mA sink current at 0.4 V. This allows direct interface with standard TTL/CMOS inputs and supports pull-up to voltages up to VCC + 0.5 V, enabling use in mixed-voltage systems where DS1232LPS-2+ supervises both 3.3 V and 5 V domains.
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:
- 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:
- 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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