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Analog Devices Inc./Maxim Integrated DS1232SN+T&R
- Part No.:
- DS1232SN+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
DS1232SN+T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,575
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Product details
Overview
DS1232SN+T&R from Maxim Integrated (formerly Dallas Semiconductor) is a microprocessor supervisory circuit that monitors VCC, provides pushbutton reset control, and implements a programmable watchdog timer. It delivers active-high and open-drain active-low reset outputs, supports 5% or 10% VCC tolerance selection via TOL pin, guarantees ≥250 ms reset pulse width, and operates across –40°C to +85°C for industrial embedded systems.
For engineers reviewing the DS1232SN+T&R datasheet, DS1232SN+T&R pinout, DS1232SN+T&R application, or DS1232SN+T&R equivalent, key selection criteria include dual-reset output polarity, selectable VCC trip point (4.25 V or 4.50 V), watchdog timeout options (150/600/1200 ms), industrial temperature rating, and 8-pin mini-DIP package compatibility with legacy designs.
Technical Context
The DS1232SN+T&R integrates three independent monitoring functions in a single IC: precision voltage monitoring using a temperature-compensated bandgap reference and comparator, hardware-debounced pushbutton reset with guaranteed 250 ms minimum pulse width, and a non-disableable watchdog timer with three timeout settings selected by TD pin state (GND/float/VCC).
Its dual RST outputs-active-high CMOS and active-low open-drain-enable direct interfacing with diverse microprocessor reset inputs; the open-drain RST supports wired-OR configurations and level translation, while the CMOS RST drives standard logic loads without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50 V (TOL=GND) or 4.25 V (TOL=VCC); sets precise power-fail detection threshold for 5 V systems |
| Reset Pulse Width | ≥250 ms minimum; ensures full processor initialization and power stabilization before release |
| Watchdog Timeout | 150 ms (TD=GND), 600 ms (TD=float), 1.2 s (TD=VCC); configurable fault-detection window |
| Operating Temp | –40°C to +85°C; validated for industrial environments without derating |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic rails and tolerates nominal ±10% variation |
| Output Drive | RST: CMOS, 8 mA sink/source; RST: open-drain, 10 mA sink; supports mixed-signal interface requirements |
Pinout & Package
DS1232SN+T&R uses an 8-pin mini-DIP (300-mil) package with through-hole mounting. Pin 1 is PBRST; pins 5 and 6 are dual RST outputs (CMOS high-active and open-drain low-active); pin 3 is TOL for VCC tolerance selection; pin 2 is TD for watchdog timeout configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low, internally pulled up; debounced input generating ≥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 Tolerance Select | GND=5% trip (4.50 V), VCC=10% trip (4.25 V); sets power-fail detection threshold |
| GND | Ground Reference | Common return for all analog and digital circuitry; required for accurate voltage monitoring |
| RST | Reset Output (Active High) | CMOS-compatible, rail-to-rail output; drives standard microprocessor reset inputs directly |
| RST | Reset Output (Active Low, Open Drain) | Open-drain output enabling wired-OR reset buses and level-shifting without external components |
| ST | Strobe Input | High-to-low transition resets watchdog timer; derived from CPU address/data/control signals |
| VCC | Power Supply Input | +5 V supply pin; powers internal reference, comparator, and logic; monitored for out-of-tolerance condition |
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-up resistors |
| Selectable VCC trip point | TOL pin configures 4.50 V (5%) or 4.25 V (10%) detection threshold, matching system-level power supply tolerance requirements |
| Guaranteed 250 ms reset pulse | Hardware-enforced minimum pulse width ensures reliable microprocessor initialization after power-up or manual reset |
| Non-disableable watchdog timer | Forces reset if ST is not strobed within configured timeout - prevents software lockup without requiring enable/disable logic |
| Industrial temperature range | –40°C to +85°C operation validated per specification; supports deployment in harsh environmental conditions |
Applications
| Industrial PLC Control | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Microcontroller-based I/O modules in factory automation systems subject to voltage transients and EMI-induced software hangs. IC Role / Device Role / Timing Role: Supervisory IC providing power-fail detection, manual reset, and watchdog timeout to force controlled restart of safety-critical firmware. Use Value: Prevents undetected firmware lockup during brownouts; dual RST outputs interface directly with both MCU reset and FPGA configuration logic. | Use Scenario: Portable ultrasound or patient monitor units requiring fail-safe boot sequencing and runtime integrity checks. IC Role / Device Role / Timing Role: System-level supervisor ensuring valid power-on reset, user-initiated recalibration reset, and periodic watchdog strobe during signal acquisition loops. Use Value: Meets IEC 62304 Class C software safety requirements via hardware-enforced reset timing and deterministic timeout behavior. |
| Point-of-Sale Terminals | Energy Metering Gateways |
Use Scenario: Embedded Linux gateways in retail kiosks exposed to unregulated AC adapters and frequent power cycling. IC Role / Device Role / Timing Role: Power supervisor managing cold-start reset, pushbutton recovery, and watchdog supervision of application processor heartbeat signals. Use Value: Eliminates need for discrete RC reset circuits and external watchdog ICs - reduces BOM count and PCB area in space-constrained enclosures. | Use Scenario: Smart electricity meters operating continuously in outdoor utility cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-grade supervisory circuit monitoring 5 V rail stability, supporting manual meter reset, and enforcing firmware execution integrity via watchdog. Use Value: –40°C to +85°C rating ensures reliable operation over full environmental range; open-drain RST enables shared reset bus across multiple ASICs. |
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; no active-high RST; fixed 4.65 V trip; watchdog timeout not programmable | Lacks dual-reset capability and adjustable watchdog; suitable only where CMOS RST is unnecessary | Choose when board layout prohibits adding external inverter and system requires simpler, fixed-threshold supervision |
| TPS3823-50DBVR | Single active-low reset; 5% accuracy at 4.63 V; no pushbutton input; watchdog disabled by default and requires enable pin | No PBRST support; no hardware debounce; watchdog must be actively enabled - increases firmware complexity | Prefer when lowest quiescent current (12 μA) is critical and pushbutton reset is handled separately in software or external logic |
Compared with MAX692AESA+ and TPS3823-50DBVR, DS1232SN+T&R uniquely delivers dual-polarity reset outputs, hardware-debounced pushbutton support, and field-selectable watchdog timeout - making it optimal for legacy 5 V systems requiring robust, self-contained supervision without firmware dependencies.
Availability
DS1232SN+T&R is available at Aetrix Electronics and suitable for industrial PLC control, medical diagnostic equipment, point-of-sale terminals, and energy metering gateways requiring stable component supply and long-term manufacturability.
Supply support for DS1232SN+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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The DS1232SN+T&R belongs to the MicroMonitor™ family of supervisory circuits engineered specifically for reliable microprocessor reset and watchdog functionality in 5 V embedded systems with demanding environmental and safety requirements.
FAQ
What is the function of the TOL pin on the DS1232SN+T&R?
The TOL pin on the DS1232SN+T&R selects the VCC detection threshold: grounded for 5% tolerance (4.50 V trip), tied to VCC for 10% tolerance (4.25 V trip). This allows system designers to match the DS1232SN+T&R's power-fail detection point to their specific 5 V supply regulation spec without external components.
Does the DS1232SN+T&R provide both active-high and active-low reset outputs?
Yes, the DS1232SN+T&R provides two independent reset outputs: pin 5 (RST) is active-high CMOS, and pin 6 (RST) is active-low open-drain. This dual-output architecture enables direct connection to microprocessors requiring either polarity and supports wired-OR reset buses - a key feature distinguishing DS1232SN+T&R from many single-output supervisors.
How is the watchdog timeout configured on the DS1232SN+T&R?
The watchdog timeout on the DS1232SN+T&R is set by the TD pin: connect TD to GND for ~150 ms, leave TD floating for ~600 ms, or tie TD to VCC for ~1.2 s. The DS1232SN+T&R does not support disabling the watchdog - it must be strobed via the ST pin to prevent timeout, ensuring continuous runtime supervision.
What is the operating temperature range of the DS1232SN+T&R?
The DS1232SN+T&R is rated for industrial operation from –40°C to +85°C, as indicated by the "N" suffix in the part number. This extended range is validated per the device's absolute maximum and recommended operating conditions, making DS1232SN+T&R suitable for deployment in non-climate-controlled industrial and outdoor electronics.
Can the DS1232SN+T&R replace older DS1232 variants in existing designs?
Yes, the DS1232SN+T&R is a direct replacement for earlier DS1232 versions in 8-pin DIP packages, maintaining identical pinout, electrical characteristics, and functional behavior. Its "N" suffix confirms industrial temperature qualification, and the "+T&R" denotes tape-and-reel packaging - both fully compatible with legacy DS1232 footprints and schematics.
DS1232SN+T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DS1232SN+T&R FAQ
1.How can I place an order for DS1232SN+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1232SN+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 DS1232SN+T&R reliable?
The price and inventory of DS1232SN+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 DS1232SN+T&R is usually 5 days.
3.What payment methods are accepted for DS1232SN+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1232SN+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1232SN+T&R?
DS1232SN+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1232SN+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 DS1232SN+T&R?
For technical support, including DS1232SN+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1232SN+T&R requirements.
6.How does Aetrix verify that DS1232SN+T&R is sourced from the original manufacturer or authorized distributors?
All DS1232SN+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 DS1232SN+T&R meets industry standards.
7.What is the process for return or replacement of DS1232SN+T&R?
All DS1232SN+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1232SN+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 DS1232SN+T&R part is unused and in its original packaging.
Return procedure for DS1232SN+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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