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Analog Devices Inc./Maxim Integrated DS1232LPS-2/T&R
- Part No.:
- DS1232LPS-2/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1232LPS-2/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,535
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Product details
Overview
DS1232LPS-2/T&R from Maxim Integrated (formerly Dallas Semiconductor) is a low-power microprocessor supervisory IC that monitors VCC, implements watchdog timer functionality, and provides pushbutton reset control. It delivers 50 µA quiescent current, supports 5% or 10% VCC threshold detection (4.75 V or 4.5 V), and guarantees ≥250 ms active reset pulse width. Used in embedded controllers where reliable power-up sequencing and crash recovery are critical.
For engineers reviewing the DS1232LPS-2/T&R datasheet, DS1232LPS-2/T&R pinout, DS1232LPS-2/T&R application, or DS1232LPS-2/T&R equivalent, key selection criteria include its dual RST outputs (active-high CMOS and active-low open-drain), selectable watchdog timeout (150/600/1200 ms), industrial temperature range, and 8-pin SOIC (150-mil) package compatibility with legacy DS1232 designs.
Technical Context
The DS1232LPS-2/T&R integrates three independent monitoring functions: precision VCC comparator with TOL-selectable trip points (4.75 V at TOL=GND, 4.5 V at TOL=VCC), debounced pushbutton reset input (PBRST) generating ≥250 ms reset pulses on release, and a non-disableable watchdog timer triggered by ST strobe edges with timeout configurable via TD pin (GND/float/VCC).
Its dual-reset architecture provides both active-high RST (CMOS) and active-low RST (open-drain) outputs for flexible interface to diverse microprocessor reset inputs. The device operates across 4.5 V to 5.5 V supply and maintains functional reset assertion down to VCC = 2.0 V, ensuring fail-safe behavior during brownout conditions.
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 before microprocessor logic fails, aligning with 5 V ±5% tolerance |
| Watchdog Timeout Options | 150 ms / 600 ms / 1200 ms - selectable via TD pin connection, supporting fast-recovery or long-loop firmware |
| Reset Pulse Width | ≥250 ms - ensures full microprocessor initialization and clock stabilization after power-up or fault |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation and remote telemetry |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerates typical regulator ripple |
| Output Types | RST (CMOS active-high), RST (open-drain active-low) - supports direct connection to both TTL and open-collector reset inputs |
Pinout & Package
DS1232LPS-2/T&R is housed in an 8-pin SOIC package (150-mil width), footprint-compatible with industry-standard 500-mil DIP but optimized for surface-mount assembly and space-constrained PCBs.
| 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→1200 ms |
| TOL | VCC Threshold Select | GND→4.75 V trip, VCC→4.5 V trip - sets power-fail sensitivity per system margin requirements |
| GND | Ground Reference | Return path for all internal comparators, timers, and output drivers |
| RST | Active-High Reset Output | CMOS-level output; drives high during reset, requires no external pull-up |
| RST | Active-Low Reset Output | Open-drain output; requires external pull-up for level translation or wired-OR reset bus |
| ST | Watchdog Strobe Input | Edge-triggered (high-to-low); resets watchdog timer; must be strobed within timeout window |
| VCC | Power Supply Input | +5 V supply rail; powers internal reference, comparator, and logic; monitored for brownout |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high CMOS and active-low open-drain signals eliminate need for external level-shifting or OR-ing logic |
| Selectable VCC detection threshold | TOL pin allows field-configurable 5% (4.75 V) or 10% (4.5 V) supply monitoring without BOM change |
| Non-disableable watchdog timer | Guarantees system recovery even if firmware disables watchdog control paths - prevents silent lockup |
| Debounced pushbutton interface | Internal hardware debouncing removes need for RC filters or firmware polling, reducing firmware overhead |
| Low-voltage reset hold-down | Maintains valid RST assertion down to VCC = 2.0 V, preventing spurious release during deep brownout |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Microcontroller-based motion control and I/O scanning in noisy factory environments with fluctuating 5 V rails. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and watchdog timeout recovery. Use Value: Prevents erratic actuator movement during voltage sags by asserting reset before MCU logic destabilizes; dual RST outputs interface directly to both FPGA configuration logic and ARM Cortex-M reset pins. | Use Scenario: Battery-powered infusion pump requiring fail-safe restart after power interruption or software hang. IC Role / Device Role / Timing Role: System supervisor ensuring deterministic boot and runtime crash recovery under strict safety compliance. Use Value: 50 µA quiescent current extends battery life; guaranteed 250 ms reset pulse meets IEC 62304 power-cycle timing requirements; open-drain RST enables shared reset bus with safety monitor IC. |
| Telecom Remote Terminal Unit | Automotive Body Control Module |
Use Scenario: Outdoor-mounted RTU operating across −40°C to +85°C with intermittent solar/battery power. IC Role / Device Role / Timing Role: Power supervisor and watchdog managing cold-start sequencing and firmware hang detection. Use Value: Industrial temp grade ensures reliability at extreme ambient; TOL-selectable threshold accommodates aging DC-DC converter drift; ST strobe driven from UART TX line for low-overhead watchdog feed. | Use Scenario: 5 V-powered BCM managing door locks, lighting, and diagnostics in vehicles with unstable battery transients. IC Role / Device Role / Timing Role: Voltage monitor and reset generator coordinating MCU startup with CAN transceiver enable timing. Use Value: Dual RST outputs allow synchronous reset of MCU and CAN PHY; VCC trip point set to 4.5 V (TOL=VCC) avoids false resets during cranking dips while maintaining safety margin. |
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 threshold; no TOL pin; 1.6 µA quiescent current | Lacks dual-reset outputs and programmable watchdog timeout; suited for simpler, ultra-low-power systems | Choose when only basic power-on reset is needed and board space is extremely constrained |
| TPS3823-50DBVR | Single active-low reset; fixed 4.63 V threshold; 200 ms reset timeout; 12 µA quiescent current; no watchdog or PBRST | No pushbutton or watchdog functionality; designed purely for power-supply monitoring | Choose when system uses separate watchdog IC or firmware-managed reset, and lowest possible IQ is critical |
Compared with MAX692AESA+ and TPS3823-50DBVR, DS1232LPS-2/T&R uniquely combines dual-reset signaling, user-selectable VCC threshold, hardware-debounced pushbutton support, and configurable watchdog timeout - making it suitable for complex embedded systems requiring integrated supervision without firmware dependency.
Availability
DS1232LPS-2/T&R is available at Aetrix Electronics and suitable for industrial automation, medical device, telecom infrastructure, and automotive body electronics requiring stable component supply and long-term lifecycle assurance.
Supply support for DS1232LPS-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
Maxim Integrated (acquired by Analog Devices in 2021) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The DS1232LPS-2/T&R belongs to Maxim's MicroMonitor™ supervisory IC product line, engineered to provide robust, integrated power-up sequencing, brownout protection, and crash recovery for 5 V microcontroller-based systems.
FAQ
What is the function of the TOL pin on the DS1232LPS-2/T&R?
The TOL pin on the DS1232LPS-2/T&R selects the VCC detection threshold: connecting TOL to GND sets the trip point to 4.75 V (±5%), while connecting it to VCC sets it to 4.5 V (±10%). This allows system designers to match the reset activation voltage to their power supply tolerance and noise margin without changing the DS1232LPS-2/T&R part number or layout.
Does the DS1232LPS-2/T&R support both active-high and active-low reset signaling?
Yes, the DS1232LPS-2/T&R provides two independent reset outputs: RST is a CMOS active-high output that drives high during reset, and RST is an open-drain active-low output requiring an external pull-up. This dual-output architecture enables direct interfacing with microcontrollers, FPGAs, and peripheral ICs that accept either reset polarity, eliminating level-shifting components.
Can the watchdog timer on the DS1232LPS-2/T&R be disabled?
No, the watchdog timer on the DS1232LPS-2/T&R cannot be disabled. It is a hardwired feature requiring periodic strobing of the ST input (high-to-low transition) to prevent timeout. This design ensures fail-safe operation: if firmware hangs or watchdog disable commands are corrupted, the DS1232LPS-2/T&R will still force a reset, preventing undetected system lockup.
What is the minimum reset pulse width guaranteed by the DS1232LPS-2/T&R?
The DS1232LPS-2/T&R guarantees a minimum reset pulse width of 250 ms for both RST and RST outputs during power-up, power-down, and pushbutton-initiated reset events. This duration exceeds typical microprocessor reset timing requirements and ensures stable clock acquisition and register initialization before program execution resumes.
Is the DS1232LPS-2/T&R compatible with the original DS1232 in terms of pinout and function?
Yes, the DS1232LPS-2/T&R is pin-compatible with the DS1232 in its 8-pin SOIC (150-mil) package and retains identical pin assignments and core functionality. However, it adds super-low power operation (50 µA vs. ~200 µA), improved accuracy, and enhanced brownout hold-down - making it a direct drop-in upgrade for existing DS1232 designs seeking lower power and higher reliability.
DS1232LPS-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:
- 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/T&R FAQ
1.How can I place an order for DS1232LPS-2/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232LPS-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 DS1232LPS-2/T&R reliable?
The price and inventory of DS1232LPS-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 DS1232LPS-2/T&R is usually 5 days.
3.What payment methods are accepted for DS1232LPS-2/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232LPS-2/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232LPS-2/T&R?
DS1232LPS-2/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232LPS-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 DS1232LPS-2/T&R?
For technical support, including DS1232LPS-2/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232LPS-2/T&R requirements.
6.How does Aetrix verify that DS1232LPS-2/T&R is sourced from the original manufacturer or authorized distributors?
All DS1232LPS-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 DS1232LPS-2/T&R meets industry standards.
7.What is the process for return or replacement of DS1232LPS-2/T&R?
All DS1232LPS-2/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1232LPS-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 DS1232LPS-2/T&R part is unused and in its original packaging.
Return procedure for DS1232LPS-2/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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