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Analog Devices Inc./Maxim Integrated DS1232N+
- Part No.:
- DS1232N+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
DS1232N+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:672
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Product details
Overview
DS1232N+ from Maxim Integrated (formerly Dallas Semiconductor) is a microprocessor supervisory circuit that monitors VCC, implements pushbutton reset with 250 ms debounced output, and provides watchdog timer functionality with selectable timeouts (150/600/1200 ms). It delivers active-high and open-drain active-low reset outputs, supports 5% or 10% VCC tolerance via TOL pin, and operates across -40°C to +85°C for industrial embedded control systems.
For engineers reviewing the DS1232N+ datasheet, DS1232N+ pinout, DS1232N+ application, or DS1232N+ equivalent, key selection considerations include dual-reset output polarity, programmable watchdog timeout via TD pin, VCC trip point selection (4.25V or 4.50V), industrial temperature rating, and compatibility with 5V microprocessor power rails requiring reliable power-on reset and fail-safe recovery.
Technical Context
The DS1232N+ integrates three independent monitoring functions in a single 8-pin DIP package: precision VCC comparator with temperature-compensated reference, hardware-debounced pushbutton reset input (PBRST), and a non-disableable watchdog timer triggered by ST strobe pulses. Its dual RST outputs-active-high CMOS and active-low open-drain-enable direct interface to diverse microcontroller reset inputs without external level-shifting.
Power-fail detection initiates reset when VCC drops below 4.25V (TOL=VCC) or 4.50V (TOL=GND); reset remains asserted for ≥250 ms after VCC recovery. Watchdog timeout is set by TD pin state (GND/float/VCC), yielding nominal delays of 150 ms, 600 ms, or 1.2 s, with all timeouts guaranteed minimum durations per Table 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.25V (TOL=VCC) or 4.50V (TOL=GND); defines precise brown-out detection threshold for 5V systems |
| Reset Pulse Width | ≥250 ms minimum; ensures stable processor initialization after power-up or manual reset |
| Watchdog Timeout | 150 ms / 600 ms / 1.2 s (TD=GND/float/VCC); prevents runaway code via configurable software supervision interval |
| Operating Temp | -40°C to +85°C; validated for industrial environments without derating |
| Supply Voltage | 4.5V to 5.5V; compatible with standard 5V logic rails and tolerates ±10% variation |
| Reset Outputs | RST (active-high CMOS) and RST (active-low open-drain); supports both microcontroller reset pin types simultaneously |
| Input Leakage | ±1.0 μA max; enables high-impedance pushbutton and strobe interfaces without loading |
Pinout & Package
DS1232N+ uses an 8-pin mini-DIP (300-mil) package with through-hole mounting. Pin 1 is PBRST; Pin 2 is TD; Pin 3 is TOL; Pin 4 is GND; Pin 5 is RST (active-high); Pin 6 is RST (active-low, open-drain); Pin 7 is ST; Pin 8 is VCC. Pins labeled NC are internally unconnected and must remain unconnected on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up; debounced to guarantee ≥250 ms reset pulse on release |
| TD | Watchdog Timeout Select | Configures watchdog period: GND=150ms, float=600ms, VCC=1.2s; no external components required |
| TOL | VCC Threshold Select | GND selects 4.50V trip (5% tolerance), VCC selects 4.25V trip (10% tolerance) |
| GND | Ground Reference | Primary return path for all internal comparators, timers, and output drivers |
| RST | Active-High Reset Output | CMOS-compatible output; drives high during reset, low otherwise; sinks ≤10mA |
| RST | Active-Low Open-Drain Reset | Requires external pull-up; drives low during reset; supports wired-OR reset bus architectures |
| ST | Watchdog Strobe Input | High-to-low transition resets watchdog timer; must occur before timeout to prevent reset assertion |
| VCC | +5V Supply Input | Power source for internal circuitry; also used as reference for TOL and TD logic levels |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-high CMOS and active-low open-drain RST signals eliminate need for external inverters or pull-ups in mixed-interface systems |
| Programmable VCC detection threshold | Selectable 4.25V or 4.50V trip point via TOL pin enables precise match to system's 5V rail tolerance requirements |
| Hardware-debounced pushbutton interface | Internal RC timing and logic ensure clean, glitch-free 250 ms reset pulse regardless of mechanical switch bounce |
| Non-disableable watchdog timer | Guarantees fail-safe operation - if firmware fails to strobe ST, reset is forced; no software bypass possible |
| Industrial temperature range | Validated operation from -40°C to +85°C ensures reliability in harsh environments without thermal derating |
Applications
| Industrial PLC Controller | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating in factory-floor environments with voltage transients and EMI. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brown-out protection, and watchdog supervision to prevent lockup during sensor data acquisition cycles. Use Value: Ensures deterministic restart after line sags and guarantees firmware responsiveness via 600 ms watchdog timeout aligned with I/O scan cycle timing. | Use Scenario: Portable ultrasound imaging device with battery-backed real-time processing and safety-critical boot integrity. IC Role / Device Role / Timing Role: Power monitor and reset manager enforcing strict boot sequence compliance and preventing corrupted image buffer writes during power transitions. Use Value: Dual RST outputs interface directly to ARM Cortex-M reset pins; 4.50V trip point matches medical-grade 5V LDO tolerance, minimizing false resets. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Under-hood body control unit exposed to wide ambient temperature swings and load-dump transients. IC Role / Device Role / Timing Role: System supervisor detecting VCC droop during cranking and asserting reset to halt CAN message transmission until stable supply resumes. Use Value: -40°C to +85°C rating ensures operation at extreme temperatures; 1.2 s watchdog timeout accommodates extended firmware self-test routines. | Use Scenario: DIN-rail mounted electricity meter with tamper detection, metrology ASIC, and secure bootloader. IC Role / Device Role / Timing Role: Boot-time guardian verifying power stability before enabling secure flash programming and cryptographic key loading. Use Value: 250 ms minimum reset hold time satisfies metrology ASIC power-up sequencing requirements; open-drain RST supports shared reset bus with isolated communication ICs. |
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 4.65V trip; no pushbutton input; watchdog timeout not user-selectable (1.6s only) | Lacks dual-reset polarity and programmable watchdog; suited for simpler reset-only designs | Choose MAX692AESA+ only if dual RST outputs and TD-configurable timeout are unnecessary |
| TPS3823-50DBVR | Active-low reset only; fixed 4.63V trip; watchdog timeout fixed at 200 ms; requires external capacitor for delay adjustment | No TOL or TD pin configuration; less flexible for varying VCC tolerance or supervision interval needs | Prefer TPS3823-50DBVR when board space is constrained and only basic reset + fixed watchdog is required |
Compared with MAX692AESA+ and TPS3823-50DBVR, the DS1232N+ uniquely delivers simultaneous active-high/active-low reset outputs, VCC trip selection via TOL, and three discrete watchdog timeouts via TD - making it optimal for industrial designs requiring configurability, robustness, and legacy 5V microcontroller compatibility.
Availability
DS1232N+ is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for DS1232N+ 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 markets.
The DS1232N+ belongs to Maxim's MicroMonitor™ supervisory IC family, engineered specifically for fail-safe microprocessor reset, power monitoring, and watchdog supervision in mission-critical 5V embedded systems.
FAQ
What is the function of the TOL pin on the DS1232N+?
The TOL pin on the DS1232N+ selects the VCC detection threshold: connecting TOL to GND sets a 4.50V trip point (5% tolerance for 5V supply), while connecting it to VCC sets a 4.25V trip point (10% tolerance). This allows system designers to match the DS1232N+'s brown-out detection precisely to their power supply's regulation spec without external components.
Does the DS1232N+ support both active-high and active-low reset outputs?
Yes, the DS1232N+ provides two independent reset outputs: Pin 5 (RST) is an active-high CMOS output, and Pin 6 (RST) is an active-low open-drain output. This dual-output architecture enables direct connection to microcontrollers requiring either reset polarity - for example, interfacing with both legacy 8051 derivatives (active-high) and modern ARM MCUs (active-low) on the same board.
How is the watchdog timeout configured on the DS1232N+?
The watchdog timeout on the DS1232N+ is set by the TD pin: grounding TD yields ~150 ms, leaving TD floating yields ~600 ms, and connecting TD to VCC yields ~1.2 s. These values are guaranteed minimums per datasheet Table 1. The watchdog cannot be disabled - it must be strobed via the ST pin at intervals shorter than the selected timeout to prevent reset assertion.
What is the minimum reset pulse width guaranteed by the DS1232N+?
The DS1232N+ guarantees a minimum reset pulse width of 250 ms for both RST outputs - whether triggered by power-up, power-down, or pushbutton release. This duration is internally timed and independent of external capacitance or supply slew rate, ensuring reliable microprocessor initialization across all operating conditions including slow-ramping power supplies.
Is the DS1232N+ compatible with modern 5V microcontrollers?
Yes, the DS1232N+ is fully compatible with modern 5V microcontrollers: its VCC operating range (4.5V–5.5V), CMOS-level RST output, open-drain RST output (with appropriate pull-up), and 250 ms reset hold time meet or exceed requirements for ARM Cortex-M, PIC, AVR, and legacy 8051 families. Its industrial temperature rating (-40°C to +85°C) further ensures reliability in demanding embedded deployments.
DS1232N+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
DS1232N+ FAQ
1.How can I place an order for DS1232N+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232N+ 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 DS1232N+ reliable?
The price and inventory of DS1232N+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1232N+ is usually 5 days.
3.What payment methods are accepted for DS1232N+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232N+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232N+?
DS1232N+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232N+ 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 DS1232N+?
For technical support, including DS1232N+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232N+ requirements.
6.How does Aetrix verify that DS1232N+ is sourced from the original manufacturer or authorized distributors?
All DS1232N+ 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 DS1232N+ meets industry standards.
7.What is the process for return or replacement of DS1232N+?
All DS1232N+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1232N+, 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 DS1232N+ part is unused and in its original packaging.
Return procedure for DS1232N+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1232N+ Tags
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MIC826SYMT-TR
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