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Analog Devices Inc./Maxim Integrated MAX1232ESA-T
- Part No.:
- MAX1232ESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1232ESA-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,371
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Product details
Overview
MAX1232ESA-T from Maxim Integrated is a microprocessor supervisory circuit that monitors +5V supply voltage, provides 250ms reset pulse width, implements programmable watchdog timeout (150ms/600ms/1.2s), and features debounced manual reset input - all in an 8-pin SO package rated for -40°C to +85°C operation. It serves as a plug-in upgrade to DS1232 in embedded controllers requiring reliable power-on reset and software execution supervision.
For engineers reviewing the MAX1232ESA-T datasheet, MAX1232ESA-T pinout, MAX1232ESA-T application, or MAX1232ESA-T equivalent, key selection criteria include adjustable 5%/10% VCC trip points (4.62V/4.37V typ), dual active-high/active-low reset outputs, no external components requirement, and guaranteed 20ms minimum PBRST assertion time.
Technical Context
The MAX1232ESA-T integrates three core supervision functions: precision voltage monitoring with digitally selectable 5% or 10% tolerance thresholds (via TOL pin), a falling-edge-triggered watchdog timer with three timeout modes set by TD pin state (GND/open/VCC), and a debounced pushbutton reset input (PBRST) that ignores sub-1ms glitches and guarantees recognition of ≥20ms pulses.
It delivers dual complementary reset outputs: RST (active-high, push-pull) and RST (active-low, open-drain), enabling direct interface with both standard logic and pull-up–dependent microcontroller reset inputs. The device operates from 4.5V to 5.5V, draws only 50µA to 200µA typical supply current, and requires zero external components for full functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 5.5V - supports standard +5V rail with ±10% margin |
| VCC Trip Point (5%) | 4.62V typical - triggers reset when supply drops below 4.5V nominal |
| VCC Trip Point (10%) | 4.37V typical - enables wider tolerance for noisy or unregulated supplies |
| Reset Pulse Width | 250ms minimum - ensures μP and peripherals fully stabilize before release |
| Watchdog Timeout Options | 150ms / 600ms / 1.2s - selected via TD pin connection (GND / open / VCC) |
| Operating Current | 50µA to 200µA - ultra-low power enables battery-backed or energy-sensitive designs |
| PBRST Recognition Threshold | ≥20ms low pulse - eliminates mechanical switch bounce without external RC |
Pinout & Package
MAX1232ESA-T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm lead pitch and surface-mount footprint compatible with JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PBRST) | Debounced manual reset input | Active-low; ignores <1ms glitches; guarantees response to ≥20ms assertion |
| 2 (TD) | Watchdog timebase select | Configures timeout: GND = 150ms, open = 600ms, VCC = 1.2s |
| 3 (TOL) | Tolerance selection input | GND = 5% trip (4.62V), VCC = 10% trip (4.37V) |
| 4 (GND) | Ground reference | Common return for all internal circuits and reset outputs |
| 5 (RST) | Active-high reset output | Push-pull driver; asserts high during reset; drives μP RESET pin directly |
| 6 (RST) | Active-low reset output | Open-drain MOSFET; requires external pull-up; interfaces with legacy μP reset inputs |
| 7 (ST) | Watchdog strobe input | Falling-edge sensitive; must be toggled within timeout window to prevent reset |
| 8 (VCC) | +5V power supply input | Operates from 4.5V–5.5V; powers internal voltage detector and logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | RST (push-pull, active-high) and RST (open-drain, active-low) enable drop-in compatibility with diverse μP reset architectures |
| No external components required | Eliminates discrete RC networks, pull-ups, or timing capacitors - reduces BOM count and layout area |
| Digitally selectable VCC tolerance | Single TOL pin selects between 5% (4.62V) and 10% (4.37V) trip points - simplifies design across varying supply stability requirements |
| Guaranteed 250ms reset hold time | Ensures stable power and clock startup before μP exits reset - prevents premature execution or latch-up |
| Three-mode watchdog timer | TD pin configures timeout to match software loop timing: 150ms (fast firmware), 600ms (general purpose), or 1.2s (slow peripherals) |
Applications
| Industrial Controllers | Medical Instrumentation |
|---|---|
Use Scenario: PLC modules and remote I/O units operating in electrically noisy factory environments with fluctuating 5V rails. IC Role / Device Role / Timing Role: Supervisory IC providing brownout detection, manual reset override, and watchdog supervision of real-time control firmware. Use Value: Prevents erratic behavior during voltage sags by holding μP in reset until 4.62V is sustained for 250ms, while the 600ms watchdog timeout aligns with deterministic control loop intervals. |
Use Scenario: Portable diagnostic devices powered by Li-ion batteries with regulated 5V DC-DC output subject to load transients. IC Role / Device Role / Timing Role: Power supervisor ensuring safe boot sequence and detecting firmware hangs during sensor acquisition routines. Use Value: 150ms watchdog timeout matches rapid sensor polling cycles; 10% trip point (4.37V) accommodates battery discharge curve without false resets. |
| Communications Gateways | Test & Measurement Equipment |
Use Scenario: Edge routers with multiple Ethernet PHYs and packet processors sharing a single +5V supply. IC Role / Device Role / Timing Role: Centralized reset manager coordinating power-up sequencing and detecting software lockups in network stack threads. Use Value: Dual RST/RST outputs simultaneously reset CPU and auxiliary ASICs; 1.2s watchdog mode accommodates complex initialization sequences during cold boot. |
Use Scenario: Benchtop oscilloscopes and signal generators requiring deterministic startup and fault recovery after firmware updates. IC Role / Device Role / Timing Role: μP monitor enforcing strict power integrity and validating main application firmware execution post-boot. Use Value: Debounced PBRST allows field-service technicians to initiate safe reset without opening enclosure; 250ms reset pulse ensures FPGA configuration completes before μP release. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+T | Fixed 2.93V reset threshold; no watchdog timer; 140ms reset pulse; SOT23-3 package | Suitable only for simple power-monitoring tasks without software supervision | Select when only basic undervoltage detection is needed and board space is constrained |
| TPS3808G12DBVR | Adjustable reset threshold (0.4V–5V); fixed 200ms reset delay; no manual reset input; 6-pin SOT23 | Lacks PBRST and programmable watchdog - requires external circuitry for manual override or timeout flexibility | Choose for precision threshold tuning in low-voltage systems where watchdog independence is not required |
Compared with MAX6326US29D3+T and TPS3808G12DBVR, the MAX1232ESA-T uniquely combines adjustable 5%/10% VCC monitoring, three-mode watchdog, debounced manual reset, and dual complementary reset outputs in a single 8-pin SO package - eliminating need for supplemental logic or timing components in μP supervision designs.
Availability
MAX1232ESA-T is available at Aetrix Electronics and suitable for industrial controllers, medical instrumentation, communications gateways, and test & measurement equipment requiring stable component supply and long-term manufacturability.
Supply support for MAX1232ESA-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, mixed-signal, and power management ICs for demanding industrial, computing, and communications applications.
The MAX1232ESA-T belongs to Maxim's microprocessor supervisory product line, engineered specifically to replace legacy DS1232-style monitors with enhanced reliability, lower power, and flexible watchdog timing - targeting embedded systems where deterministic reset behavior and firmware supervision are critical.
FAQ
What is the operating temperature range for the MAX1232ESA-T?
The MAX1232ESA-T is specified for operation from -40°C to +85°C, making it suitable for industrial and extended-temperature embedded applications. This rating is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet. The 'E' suffix denotes the extended temperature grade, and the 'SA' package code indicates the 8-pin SO variant. The MAX1232ESA-T maintains full electrical performance across this entire range without derating.
How does the MAX1232ESA-T implement its watchdog timer, and what are the timeout options?
The MAX1232ESA-T watchdog timer is triggered by falling edges on the ST pin and offers three timeout durations: 150ms (TD = GND), 600ms (TD = open), or 1.2s (TD = VCC). The timeout period is determined solely by the voltage state of the TD pin, with no external components required. This design allows firmware developers to match the watchdog interval precisely to their software loop timing without hardware changes - a key advantage over fixed-timer supervisors.
Can the MAX1232ESA-T replace the DS1232 directly in existing designs?
Yes, the MAX1232ESA-T is explicitly described as a "plug-in upgrade" of the Dallas DS1232, with identical pinout, function mapping, and reset timing behavior in the 8-pin SO package. It retains the same VCC, GND, RST, RST, PBRST, ST, TOL, and TD pin assignments. Engineers can substitute MAX1232ESA-T for DS1232 without PCB modifications, gaining lower power consumption (1/10th), improved accuracy, and enhanced debounce performance.
What are the voltage trip points supported by the MAX1232ESA-T, and how are they selected?
The MAX1232ESA-T supports two precision VCC trip points: 4.62V (5% tolerance) and 4.37V (10% tolerance), selected by connecting the TOL pin to GND or VCC respectively. These thresholds are guaranteed across temperature and supply variations, with tight min/typ/max spreads (e.g., 4.50V–4.74V for 5%). No external resistors or calibration are needed - selection is purely digital via a single logic-level connection.
Does the MAX1232ESA-T require external components to operate?
No, the MAX1232ESA-T requires no external components for full functionality. Its internal voltage reference, oscillator, debounce circuitry, and logic eliminate the need for external capacitors, resistors, or pull-ups. The only required connections are VCC, GND, and the functional pins (PBRST, TD, TOL, ST, RST, RST). This simplifies design, improves reliability, and reduces bill-of-materials cost compared to discrete supervision solutions.
MAX1232ESA-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1232ESA-T FAQ
1.How can I place an order for MAX1232ESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1232ESA-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 MAX1232ESA-T reliable?
The price and inventory of MAX1232ESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1232ESA-T is usually 5 days.
3.What payment methods are accepted for MAX1232ESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1232ESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1232ESA-T?
MAX1232ESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1232ESA-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 MAX1232ESA-T?
For technical support, including MAX1232ESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1232ESA-T requirements.
6.How does Aetrix verify that MAX1232ESA-T is sourced from the original manufacturer or authorized distributors?
All MAX1232ESA-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 MAX1232ESA-T meets industry standards.
7.What is the process for return or replacement of MAX1232ESA-T?
All MAX1232ESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1232ESA-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 MAX1232ESA-T part is unused and in its original packaging.
Return procedure for MAX1232ESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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