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Analog Devices Inc./Maxim Integrated DS1232LPU/T&R
- Part No.:
- DS1232LPU/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DS1232LPU/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,632
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Product details
Overview
DS1232LPU/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 manages pushbutton reset with debouncing. It delivers 50 µA quiescent current, supports 5% or 10% VCC threshold detection (4.5 V or 4.75 V), 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 DS1232LPU/T&R datasheet, DS1232LPU/T&R pinout, DS1232LPU/T&R application, or DS1232LPU/T&R equivalent, key selection considerations include its dual RST/RST outputs (active-high and open-drain active-low), selectable watchdog timeout (150/600/1200 ms), industrial temperature range (–40°C to +85°C), and 8-pin SOIC package compatibility.
Technical Context
The DS1232LPU/T&R integrates three independent monitoring functions: precision VCC comparator with TOL-selectable trip points (4.25–4.74 V), edge-triggered strobe-based watchdog timer with TD-configurable timeout, and debounced PBRST input generating guaranteed 250 ms minimum reset pulses. All functions operate without external components.
Its dual-reset architecture provides both CMOS-compatible active-high RST and open-drain active-low RST for flexible interface with diverse microcontrollers. The internal power-fail detection holds reset active for ≥250 ms after VCC recovery, ensuring stable processor initialization before execution resumes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 50 µA - enables battery-backed or ultra-low-power embedded systems |
| VCC Trip Point (TOL=GND) | 4.50–4.74 V - triggers reset when 5 V supply drops below 4.75 V ±5% |
| VCC Trip Point (TOL=VCC) | 4.25–4.49 V - triggers reset when 5 V supply drops below 4.5 V ±10% |
| Watchdog Timeout Options | 150 ms (TD=GND), 600 ms (TD=open), 1.2 s (TD=VCC) - configurable fault-detection window |
| Reset Pulse Width | ≥250 ms - ensures sufficient time for microcontroller power stabilization and register reset |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and marginal brown-out conditions |
Pinout & Package
DS1232LPU/T&R is supplied in an 8-pin SOIC (150-mil) package, pin-compatible with DS1232LPS-2 variant. Package dimensions conform to JEDEC MS-012AA.
| 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, open=600 ms, VCC=1.2 s |
| TOL | VCC Threshold Select | GND selects 5% tolerance (4.75 V), VCC selects 10% tolerance (4.5 V) |
| GND | Ground Reference | Return path for all internal comparators and output drivers |
| RST | Active-High Reset Output | CMOS-level output; drives high during reset assertion |
| RST | Active-Low Open-Drain Reset | Open-drain output; requires external pull-up; sinks current during reset |
| ST | Watchdog Strobe Input | Edge-sensitive; high-to-low transition resets watchdog timer |
| VCC | Power Supply Input | +5 V nominal supply; powers internal comparators, timers, and output buffers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST (active-high CMOS) and RST (active-low open-drain) enable direct interfacing with varied MCU reset architectures |
| Configurable VCC detection threshold | TOL pin selects between 4.5 V (10%) or 4.75 V (5%) trip point-no external resistors required |
| Hardware-debounced pushbutton input | PBRST eliminates need for external RC filters or firmware debounce logic |
| Non-disableable watchdog timer | Guarantees system recovery even if watchdog-enable logic fails; requires periodic ST strobing |
| Power-fail hold-off timing | Resets remain asserted ≥250 ms after VCC returns to spec-prevents premature MCU restart during supply recovery |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based control unit operating in factory environments with fluctuating 5 V rail and EMI-induced software hangs. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brown-out detection, hardware watchdog timeout, and front-panel reset initiation. Use Value: Prevents corrupted state execution during undervoltage; forces safe reboot after watchdog timeout; eliminates need for manual power cycle. | Use Scenario: Portable ultrasound or patient monitor where battery life and fault resilience are critical. IC Role / Device Role / Timing Role: Low-power (50 µA) supervisor ensuring reliable boot sequence and automatic recovery from frozen firmware states. Use Value: Extends battery runtime while guaranteeing deterministic reset behavior during power transitions and software faults. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Retail terminal exposed to frequent AC line disturbances and user-initiated reboots via physical button. IC Role / Device Role / Timing Role: Manages pushbutton reset with hardware debouncing and synchronizes reset assertion with VCC stability. Use Value: Eliminates spurious resets from mechanical switch bounce; ensures clean, timed reset pulse regardless of button press duration. | Use Scenario: Utility meter operating unattended for years on 5 V regulated supply derived from mains or backup battery. IC Role / Device Role / Timing Role: Monitors long-term VCC integrity and detects silent firmware lockups via strobed watchdog. Use Value: Enables autonomous recovery without field service; maintains data logging continuity across unexpected crashes. |
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 PBRST or watchdog timer | Suitable only for basic power-monitoring-only use cases; lacks software fault recovery capability | Select when only VCC supervision is needed and board space is constrained |
| TPS3823-33DBVR | Fixed 3.08 V threshold; 200 ms reset timeout; no watchdog or pushbutton support; 1.5 µA quiescent current | Optimized for ultra-low-power 3.3 V systems; incompatible with 5 V operation or multi-function supervision | Select for 3.3 V designs prioritizing minimal current draw over feature set |
Compared with MAX6326US29D3+ and TPS3823-33DBVR, the DS1232LPU/T&R uniquely combines 5 V operation, dual reset outputs, configurable watchdog, and pushbutton management in one 8-pin SOIC-making it the only option among the three supporting full-spectrum microprocessor supervision in industrial 5 V systems.
Availability
DS1232LPU/T&R is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, point-of-sale terminals, and smart energy metering requiring stable component supply and long-term lifecycle support.
Supply support for DS1232LPU/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 communications applications.
The DS1232LPU/T&R belongs to Maxim's MicroMonitor™ family-engineered specifically for robust, single-chip microprocessor supervision in harsh or resource-constrained embedded environments.
FAQ
What is the function of the TOL pin on the DS1232LPU/T&R?
The TOL pin on the DS1232LPU/T&R selects the VCC detection threshold: connecting TOL to ground sets a 5% tolerance (trip at ~4.75 V), while connecting it to VCC sets a 10% tolerance (trip at ~4.5 V). This allows field-configurable brown-out detection without changing the DS1232LPU/T&R part number or PCB layout.
Does the DS1232LPU/T&R support watchdog timer disable?
No-the DS1232LPU/T&R watchdog timer cannot be disabled. It must be periodically strobed via the ST input to prevent timeout. This design ensures fail-safe behavior: if firmware stops strobing ST due to crash or hang, the DS1232LPU/T&R will assert reset within the configured timeout (150/600/1200 ms), forcing system recovery.
What are the electrical characteristics of the RST and RST outputs on the DS1232LPU/T&R?
The DS1232LPU/T&R provides two reset outputs: RST is an active-high CMOS output (VOH ≥ VCC – 0.1 V, VOL ≤ 0.4 V), while RST is an active-low open-drain output requiring an external pull-up resistor. Both deliver ≥250 ms minimum pulse width and sink/source ≥10 mA under specified load conditions.
Can the DS1232LPU/T&R operate from a 3.3 V supply?
No-the DS1232LPU/T&R is specified only for 4.5 V to 5.5 V operation. Its internal voltage reference and comparator circuitry are calibrated for 5 V systems. Using it with 3.3 V violates the absolute maximum ratings and will result in incorrect or non-functional VCC monitoring and reset assertion.
How does the DS1232LPU/T&R handle power-up reset timing?
On power-up, the DS1232LPU/T&R asserts both RST and RST for a minimum of 250 ms after VCC reaches valid level (≥4.5 V), regardless of TOL setting. This ensures the microprocessor and associated peripherals fully stabilize before release from reset-eliminating race conditions during boot initialization.
DS1232LPU/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
DS1232LPU/T&R FAQ
1.How can I place an order for DS1232LPU/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232LPU/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 DS1232LPU/T&R reliable?
The price and inventory of DS1232LPU/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 DS1232LPU/T&R is usually 5 days.
3.What payment methods are accepted for DS1232LPU/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232LPU/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232LPU/T&R?
DS1232LPU/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232LPU/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 DS1232LPU/T&R?
For technical support, including DS1232LPU/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232LPU/T&R requirements.
6.How does Aetrix verify that DS1232LPU/T&R is sourced from the original manufacturer or authorized distributors?
All DS1232LPU/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 DS1232LPU/T&R meets industry standards.
7.What is the process for return or replacement of DS1232LPU/T&R?
All DS1232LPU/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1232LPU/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 DS1232LPU/T&R part is unused and in its original packaging.
Return procedure for DS1232LPU/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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