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Analog Devices Inc./Maxim Integrated DS1232LP+
- Part No.:
- DS1232LP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
DS1232LP+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:736
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Product details
Overview
DS1232LP+ 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 50 µA quiescent current, 4.5–5.5 V operation, and dual active-high/active-low RST outputs. It is used in embedded systems requiring reliable power-up sequencing and fault recovery, such as industrial controllers and legacy microcontroller-based instrumentation.
For engineers reviewing the DS1232LP+ datasheet, DS1232LP+ pinout, DS1232LP+ application, or DS1232LP+ equivalent, key selection considerations include its dual-reset output configuration, selectable 5%/10% VCC tolerance via TOL pin, programmable watchdog timeout (150 ms / 600 ms / 1.2 s), and support for 8-pin DIP, SOIC, and µ-SOP packages.
Technical Context
The DS1232LP+ integrates three independent monitoring functions: precision VCC detection using an internal temperature-compensated reference (trip points 4.25–4.74 V depending on TOL state), a debounced pushbutton reset input (PBRST) generating ≥250 ms reset pulses, and a non-disableable watchdog timer triggered by ST strobe edges with timeout set by TD pin logic level.
Its dual RST outputs - one CMOS active-high, one open-drain active-low - enable direct interface to both TTL/CMOS processors and external pull-up configurations. The device asserts reset during power-down (VCC < trip point) and holds it active for ≥250 ms after power-up or pushbutton release, ensuring processor stabilization before execution resumes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 50 µA - enables battery-backed or ultra-low-power standby operation without compromising supervision reliability. |
| VCC Operating Range | 4.5 V to 5.5 V - supports standard +5 V microprocessor rails with margin for ripple and droop. |
| VCC Trip Accuracy | ±5% or ±10% - selected via TOL pin grounding (4.75 V threshold) or tying to VCC (4.5 V threshold). |
| Watchdog Timeout Options | 150 ms / 600 ms / 1.2 s - set by TD pin at GND / floating / VCC, enabling adaptation to software loop timing constraints. |
| Reset Pulse Width | ≥250 ms - guaranteed minimum duration for both RST and RST outputs ensures robust processor initialization. |
| Operating Temperature | 0°C to +70°C - commercial-grade rating; industrial variant DS1232LPN+ supports –40°C to +85°C. |
| Output Types | RST (CMOS active-high), RST (open-drain active-low) - provides flexible interfacing to diverse processor reset architectures. |
Pinout & Package
DS1232LP+ is available in 8-pin DIP (300-mil), 8-pin SOIC (150-mil), and 118-mil µ-SOP packages. Pinout is identical across these 8-pin variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up; debounced to generate ≥250 ms reset pulse on release. |
| TD | Watchdog Timeout Select | Ground = ~150 ms, float = ~600 ms, VCC = ~1.2 s; determines maximum software loop interval before forced reset. |
| TOL | VCC Threshold Select | Ground = 4.75 V trip (±5%), VCC = 4.5 V trip (±10%); sets power-fail detection sensitivity. |
| GND | Ground Reference | Return path for all internal comparators, timers, and output drivers. |
| RST | Active-High Reset Output | CMOS-compatible, rail-to-rail output; drives high during reset assertion. |
| RST | Active-Low Reset Output | Open-drain, requires external pull-up; sinks current during reset assertion. |
| ST | Watchdog Strobe Input | High-to-low edge resets watchdog timer; must be toggled within timeout window to prevent reset. |
| VCC | Power Supply Input | +5 V supply pin; powers internal reference, comparator, timer, and output buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Reset Architecture | Simultaneous CMOS active-high and open-drain active-low RST signals eliminate need for external level-shifting or inversion logic. |
| Programmable Watchdog Timeout | Three discrete timeout settings (150/600/1200 ms) selected by simple TD pin connection - no external components required. |
| VCC Monitoring with Selectable Threshold | TOL pin configures detection sensitivity to match system power rail tolerance (5% or 10%), avoiding false resets due to nominal ripple. |
| Guaranteed Power-On Reset Hold Time | Resets remain asserted for ≥250 ms after VCC rises above trip point - ensures stable clock and supply before CPU boot. |
| Integrated Pushbutton Debounce | Hardware-based PBRST input filtering eliminates firmware debounce code and prevents contact-bounce-induced spurious resets. |
Applications
| Industrial PLC Controller | Legacy Medical Instrumentation |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating in factory-floor environments with noisy 5 V supplies and occasional brownouts. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, watchdog timeout enforcement, and hardware reset initiation. Use Value: Prevents erratic program execution during voltage sag by asserting reset before VCC drops below 4.5 V and holding it ≥250 ms post-recovery. | Use Scenario: Battery-backed patient monitor with long idle periods and infrequent CPU wake-ups requiring ultra-low quiescent current. IC Role / Device Role / Timing Role: Low-power supervisor managing power-on reset, pushbutton-initiated calibration reset, and software-loop watchdog. Use Value: 50 µA quiescent current extends battery life while maintaining full supervision capability across all operational states. |
| Point-of-Sale Terminal | Telecom Line Card |
Use Scenario: Embedded terminal with EEPROM-based configuration storage and frequent user-initiated reboots via front-panel button. IC Role / Device Role / Timing Role: Hardware reset manager handling both power-related and user-triggered reset events. Use Value: Debounced PBRST input guarantees clean ≥250 ms reset pulse regardless of switch bounce, preventing partial reboots or corrupted EEPROM writes. | Use Scenario: Carrier-grade line card with hot-swap capability and strict uptime requirements under fluctuating backplane voltages. IC Role / Device Role / Timing Role: Fault-detection agent monitoring VCC stability and software liveliness via ST strobe from control processor. Use Value: Non-disableable watchdog forces recovery if firmware hangs, while dual RST outputs interface directly to both FPGA and ASIC reset domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | Higher quiescent current (10 µA typical), fixed 4.65 V reset threshold, no TOL-selectable tolerance. | Lacks programmable VCC trip point and dual RST outputs; single active-low reset only. | Choose when fixed-threshold supervision suffices and board space allows SOIC-8 footprint. |
| TPS3823-50DBVR | Lower quiescent current (3 µA), fixed 4.63 V threshold, no watchdog or pushbutton input. | Supervises only VCC; no built-in timer or manual reset functionality - requires external circuitry for those features. | Choose for minimal power-supply-only monitoring where watchdog and PBRST are handled separately. |
Compared with MAX692AESA+ and TPS3823-50DBVR, the DS1232LP+ uniquely combines ultra-low quiescent current (50 µA), selectable VCC tolerance, integrated watchdog with three timeout options, and dual-output reset - making it optimal for space-constrained, self-contained supervision in legacy 5 V systems.
Availability
DS1232LP+ is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, point-of-sale terminals, and telecom line cards requiring stable component supply and long-term obsolescence management.
Supply support for DS1232LP+ 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 applications.
The DS1232LP+ belongs to Maxim's MicroMonitor™ family of supervisory circuits, engineered specifically for reliable power-up sequencing, software watchdog enforcement, and manual reset management in 5 V microprocessor systems.
FAQ
What is the function of the TOL pin on the DS1232LP+?
The TOL pin on the DS1232LP+ selects the VCC detection threshold tolerance: grounded for ±5% (4.75 V trip), tied to VCC for ±10% (4.5 V trip). This allows system designers to align reset activation with actual power rail stability margins, preventing premature resets due to nominal supply ripple. The DS1232LP+ uses this pin to configure its internal comparator reference without external resistors.
Does the DS1232LP+ support both active-high and active-low reset outputs simultaneously?
Yes, the DS1232LP+ provides two independent reset outputs: RST (CMOS active-high) and RST (open-drain active-low). Both assert simultaneously during power failure, pushbutton press, or watchdog timeout. This dual-output architecture enables direct compatibility with processors requiring either reset polarity - eliminating level shifters or inverters in mixed-signaling systems using the DS1232LP+.
How is the watchdog timeout configured on the DS1232LP+?
The DS1232LP+ watchdog timeout is set by the TD pin: connect to GND for ~150 ms, leave floating for ~600 ms, or tie to VCC for ~1.2 s. A high-to-low edge on the ST pin resets the timer; failure to strobe within the selected window forces both RST outputs active for ≥250 ms. The DS1232LP+ watchdog cannot be disabled - it must be actively serviced.
What package options are available for the DS1232LP+?
The DS1232LP+ is offered in 8-pin DIP (300-mil), 8-pin SOIC (150-mil), and 118-mil µ-SOP packages. All share identical pinout and electrical specifications. The 16-pin SOIC variant (DS1232LPS) is a different part number with NC pins and not interchangeable with DS1232LP+. DS1232LP+ marking is "DS1232L" on DIP/SOIC and "1232" on µ-SOP.
Is the DS1232LP+ suitable for industrial temperature applications?
The standard DS1232LP+ is rated for 0°C to +70°C operation. For industrial environments requiring –40°C to +85°C, the DS1232LPN+ variant is specified and marked with suffix 'N'. Both share identical functionality and pinout, but DS1232LPN+ undergoes extended temperature screening. Always verify the suffix and temperature grade when sourcing DS1232LP+ for wide-temperature deployments.
DS1232LP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
DS1232LP+ FAQ
1.How can I place an order for DS1232LP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232LP+ 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 DS1232LP+ reliable?
The price and inventory of DS1232LP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1232LP+ is usually 5 days.
3.What payment methods are accepted for DS1232LP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232LP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232LP+?
DS1232LP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232LP+ 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 DS1232LP+?
For technical support, including DS1232LP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232LP+ requirements.
6.How does Aetrix verify that DS1232LP+ is sourced from the original manufacturer or authorized distributors?
All DS1232LP+ 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 DS1232LP+ meets industry standards.
7.What is the process for return or replacement of DS1232LP+?
All DS1232LP+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1232LP+, 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 DS1232LP+ part is unused and in its original packaging.
Return procedure for DS1232LP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1232LP+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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