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Analog Devices Inc./Maxim Integrated MAX1232CSA-T
- Part No.:
- MAX1232CSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1232CSA-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,097
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Product details
Overview
MAX1232CSA-T from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit that monitors +5V supply voltage, provides a 250ms minimum reset pulse on power-up/brownout, features a digitally programmable watchdog timer (150ms/600ms/1.2s), includes a debounced manual reset input, and operates across 0°C to +70°C - used in embedded controllers for reliable power-on initialization and software fault recovery.
For engineers reviewing the MAX1232CSA-T datasheet, MAX1232CSA-T pinout, MAX1232CSA-T application, or MAX1232CSA-T equivalent, this page delivers verified functional specifications, package-confirmed pin roles, real-world use cases in critical μP systems, and validated alternative options for power-monitoring IC selection.
Technical Context
The MAX1232CSA-T integrates three core supervision functions: precision VCC monitoring with selectable 5% (+4.62V typ) or 10% (+4.37V typ) trip points via TOL pin, a falling-edge-triggered watchdog timer whose timeout is set by TD pin voltage (GND = 150ms, open = 600ms, VCC = 1.2s), and a debounced PBRST input that guarantees recognition of ≥20ms low pulses while ignoring transients <1ms.
It delivers dual active-reset outputs: RST (active-high, push-pull) and RST (active-low, open-drain), enabling flexible interface with diverse microprocessor reset inputs. All functions operate without external components, and supply current remains ≤200µA over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - supports standard +5V rail with ±10% tolerance margin. |
| Reset Pulse Width | 250ms minimum - ensures stable μP initialization after power-up or brownout. |
| VCC Trip Point | +4.62V (5% tol, TOL=GND) or +4.37V (10% tol, TOL=VCC) - precise, digitally selectable threshold. |
| Watchdog Timeout | 150ms / 600ms / 1.2s - selectable via TD pin connection, enabling adaptation to software loop timing. |
| Operating Current | 50µA to 200µA - ultra-low power enables battery-backed or energy-sensitive designs. |
| PBRST Input Delay | 1ms to 20ms - internal debounce rejects noise while guaranteeing response to valid manual reset. |
| Output Drive | RST: ±12mA push-pull; RST: 10mA sink (open-drain) - drives standard logic inputs and pull-up networks. |
Pinout & Package
MAX1232CSA-T is supplied in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PBRST) | Debounced manual reset input | Active-low; ignores <1ms glitches, recognizes ≥20ms assertion; internal ~40kΩ pull-up to VCC. |
| 2 (TD) | Watchdog timebase select | Connect to GND (150ms), float (600ms), or VCC (1.2s); sets timeout period for ST strobe monitoring. |
| 3 (TOL) | Tolerance selection input | Ground for 5% VCC trip (+4.62V typ); connect to VCC for 10% trip (+4.37V typ). |
| 4 (GND) | Ground reference | Primary return path for all internal circuits and reset outputs. |
| 5 (RST) | Active-high reset output | Push-pull driver; asserts high during reset; sinks/source up to ±12mA. |
| 6 (RST) | Active-low reset output | Open-drain MOSFET; requires external pull-up; sinks up to 10mA. |
| 7 (ST) | Watchdog strobe input | Falling-edge sensitive; must be toggled within timeout window to prevent reset assertion. |
| 8 (VCC) | +5V power supply input | Operates from 4.5V–5.5V; powers internal comparators, timer, and outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | RST (push-pull, active-high) and RST (open-drain, active-low) support direct interface with varied μP reset architectures. |
| Selectable voltage threshold | 5% or 10% VCC tolerance via single TOL pin connection - eliminates external resistor dividers. |
| Programmable watchdog timeout | Three discrete settings (150ms/600ms/1.2s) selected by TD pin state - adapts to firmware execution timing without re-spin. |
| Integrated debounce | Hardware-based PBRST filtering rejects mechanical switch bounce and EMI without RC network or firmware overhead. |
| Zero external components | Full supervision functionality achieved with no capacitors, resistors, or diodes - reduces BOM count and board area. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Microcontroller-based PLC modules deployed in factory automation require deterministic reset behavior after line voltage sags or cold starts. IC Role / Device Role / Timing Role: MAX1232CSA-T acts as primary power supervisor and watchdog, asserting both RST and RST outputs for ≥250ms to ensure full μP register initialization and clock stabilization. Use Value: Eliminates spurious resets during transient brownouts and guarantees recovery from hung firmware loops via configurable 600ms watchdog timeout. |
Use Scenario: Portable ultrasound or blood glucose analyzers rely on battery-backed operation where supply voltage drift must trigger safe shutdown before data corruption. IC Role / Device Role / Timing Role: MAX1232CSA-T monitors VCC against 5% threshold (+4.62V) and forces reset if battery drops below safe operating level. Use Value: Ultra-low 200µA quiescent current extends battery life; dual reset outputs enable simultaneous reset of analog front-end and digital controller. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Carrier-grade edge routers undergo frequent remote firmware updates and must recover reliably from failed boot sequences. IC Role / Device Role / Timing Role: MAX1232CSA-T serves as hardware-enforced fail-safe: ST strobe failure triggers 1.2s watchdog timeout, initiating controlled reboot via RST/RST. Use Value: Configurable long timeout prevents false triggers during extended flash writes; debounced PBRST allows field technician-initiated recovery without system disassembly. |
Use Scenario: ANSI C12.20-compliant electricity meters operate unattended for 15+ years and require immunity to grid transients and meter tampering. IC Role / Device Role / Timing Role: MAX1232CSA-T provides brownout detection at 10% VCC tolerance (+4.37V) and latches reset until stable supply returns for ≥250ms. Use Value: Selectable tolerance accommodates aging power supplies; no external components reduce long-term reliability risk from capacitor drift or solder fatigue. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+T | Fixed 2.93V reset threshold; no watchdog timer; 3-pin SOT23 package; 1.6µA typical ICC. | Suitable only for simple power-fail detection - lacks software supervision capability required for μP watchdog use cases. | Select when only basic VCC monitoring is needed and board space is constrained; not a functional substitute for MAX1232CSA-T's dual supervision. |
| TPS3808G12DBVR | Adjustable reset threshold (0.4V–5V) via external resistor; fixed 200ms reset timeout; no manual reset input; 6-pin SOT23. | Requires external resistor network for threshold setting; cannot replace MAX1232CSA-T's integrated TOL-selectable trip point or debounced PBRST. | Choose for designs needing programmable threshold with minimal footprint, but only if watchdog and manual reset functions are handled elsewhere. |
Compared with MAX6326US29D3+T and TPS3808G12DBVR, the MAX1232CSA-T uniquely integrates voltage monitoring, programmable watchdog timing, and debounced manual reset in a single 8-pin SO package - making it the only option among the three that satisfies full μP housekeeping requirements without external components.
Availability
MAX1232CSA-T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, network edge routers, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX1232CSA-T 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 and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on high-reliability, low-power solutions.
The MAX1232CSA-T belongs to Maxim's microprocessor supervisory product line, engineered specifically to replace legacy DS1232 devices with enhanced accuracy, lower power, and integrated watchdog functionality for embedded μP systems.
FAQ
What is the function of the TOL pin on the MAX1232CSA-T?
The TOL pin on the MAX1232CSA-T selects the VCC reset threshold tolerance: connecting TOL to GND configures a 5% trip point (~+4.62V), while connecting it to VCC selects a 10% trip point (~+4.37V). This digital selection eliminates external resistor networks and allows field-configurable brownout sensitivity without changing the MAX1232CSA-T footprint or bill of materials.
Does the MAX1232CSA-T require external components to operate?
No, the MAX1232CSA-T requires no external components to perform full supervision - including power-on reset, brownout detection, watchdog timing, and manual reset debouncing. Its internal voltage reference, oscillator, and logic eliminate the need for capacitors, resistors, or diodes, reducing design complexity and improving long-term reliability compared to discrete supervision solutions.
How does the watchdog timer on the MAX1232CSA-T respond to software failures?
The MAX1232CSA-T watchdog timer monitors the ST pin for falling edges. If the microprocessor fails to toggle ST within the programmed timeout (150ms/600ms/1.2s), the MAX1232CSA-T asserts both RST and RST for ≥250ms. This forces a full system reset, recovering from lockups caused by corrupted code, infinite loops, or interrupt masking - a critical safeguard in safety-critical μP applications.
What is the difference between the RST and RST outputs on the MAX1232CSA-T?
The MAX1232CSA-T provides two complementary reset outputs: RST is active-high with push-pull drive (±12mA), directly compatible with μPs expecting high-asserted reset; RST is active-low, open-drain (10mA sink), requiring an external pull-up but enabling wired-OR configurations and level-shifting. Both remain active for ≥250ms during any reset event - power-up, brownout, watchdog timeout, or PBRST assertion.
Can the MAX1232CSA-T replace the DS1232 in existing designs?
Yes, the MAX1232CSA-T is explicitly designed as a plug-in upgrade for the Dallas DS1232, sharing identical pinout, function mapping, and reset timing. It improves upon the DS1232 with 1/10th the supply current, tighter voltage thresholds, and a programmable watchdog - all while maintaining backward compatibility, allowing drop-in replacement without PCB or firmware changes in DS1232-based systems.
MAX1232CSA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- 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 or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 250ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1232CSA-T FAQ
1.How can I place an order for MAX1232CSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1232CSA-T 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 MAX1232CSA-T reliable?
The price and inventory of MAX1232CSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1232CSA-T is usually 5 days.
3.What payment methods are accepted for MAX1232CSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1232CSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1232CSA-T?
MAX1232CSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1232CSA-T 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 MAX1232CSA-T?
For technical support, including MAX1232CSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1232CSA-T requirements.
6.How does Aetrix verify that MAX1232CSA-T is sourced from the original manufacturer or authorized distributors?
All MAX1232CSA-T 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 MAX1232CSA-T meets industry standards.
7.What is the process for return or replacement of MAX1232CSA-T?
All MAX1232CSA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1232CSA-T, 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 MAX1232CSA-T part is unused and in its original packaging.
Return procedure for MAX1232CSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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