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Analog Devices Inc./Maxim Integrated MAX1232EWE+T
- Part No.:
- MAX1232EWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX1232EWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,399
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Product details
Overview
MAX1232EWE+T from Maxim Integrated is a microprocessor supervisory circuit that monitors +5V supply voltage, provides 250ms reset pulse width, supports digitally selectable 5% or 10% VCC tolerance, features a programmable watchdog timer (150ms/600ms/1.2s), and includes a debounced manual reset input - all in a 16-pin wide SO package for industrial-grade embedded systems requiring reliable power-on reset and software execution monitoring.
For engineers reviewing the MAX1232EWE+T datasheet, MAX1232EWE+T pinout, MAX1232EWE+T application, or MAX1232EWE+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for μP supervision in temperature-critical controllers and intelligent instruments.
Technical Context
The MAX1232EWE+T integrates three core supervision functions: precision voltage detection with dual-threshold selection (4.62V typical at 5%, 4.37V at 10%), a falling-edge-triggered watchdog timer whose timeout is set by TD pin voltage (GND = 150ms, open = 600ms, VCC = 1.2s), and a debounced pushbutton reset input (PBRST) with guaranteed recognition of ≥20ms low pulses and 250ms minimum reset assertion.
It delivers complementary active-high (RST) and open-drain active-low (RST) reset outputs, both held active for ≥250ms after VCC rise, brownout recovery, or manual trigger - ensuring stable μP initialization. No external components are required, and operating current is specified at 50–200µA over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - compatible with standard +5V rail; no level-shifting needed. |
| Reset Pulse Width | ≥250ms - ensures full μP power stabilization before release. |
| VCC Trip Point | 4.62V (5% tol.) or 4.37V (10% tol.) - selected via TOL pin connection. |
| Watchdog Timeout | 150ms / 600ms / 1.2s - set by TD pin (GND / open / VCC); falling-edge triggered. |
| Operating Current | 50µA to 200µA - ultra-low quiescent draw enables battery-backed operation. |
| PBRST Recognition | Guaranteed for ≥20ms low pulse - eliminates mechanical switch bounce without external RC. |
| Temperature Range | –40°C to +85°C - qualified for industrial environments without derating. |
Pinout & Package
MAX1232EWE+T is housed in a 16-pin wide SO (SOIC-W) package with 0.300" body width and standard 0.050" pitch. Pin 1 is marked with a notch or dot; pins 1–8 and 9–16 are on opposing sides. All N.C. pins are internally unconnected and must remain floating or grounded per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 10, 12, 14, 16 | N.C. | No internal connection; leave unconnected or tie to GND per PCB noise control best practice. |
| 2 | PBRST | Debounced active-low manual reset input; recognizes ≥20ms low pulse; internal ~40kΩ pull-up to VCC. |
| 4 | TD | Watchdog timebase select: GND = 150ms, open = 600ms, VCC = 1.2s timeout. |
| 6 | TOL | Tolerance select: GND = 5% trip (4.62V), VCC = 10% trip (4.37V). |
| 8 | GND | Analog/digital ground reference for all internal comparators and logic. |
| 9 | RST | Active-high reset output; drives high/low; sinks/source capability per IOH/IOL specs. |
| 11 | RST | Active-low open-drain reset output; requires external pull-up; sinks up to 10mA. |
| 13 | ST | Watchdog strobe input; triggered only on falling edge; must be toggled within timeout window. |
| 15 | VCC | +5V supply input; accepts 4.5V–5.5V; powers all internal circuits and reset drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-threshold voltage monitor | Selectable 4.62V (5%) or 4.37V (10%) trip point via single TOL pin - simplifies BOM across varying supply stability requirements. |
| Three-range programmable watchdog | Hardware-configurable timeout (150ms/600ms/1.2s) eliminates firmware dependency for timing setup - reduces validation effort. |
| Integrated debounce on PBRST | Eliminates need for external RC filter or microcontroller GPIO polling - saves board space and firmware overhead. |
| Complementary RST outputs | Simultaneous active-high and open-drain active-low reset signals support legacy and modern μP interface standards without level shifters. |
| Zero-external-component operation | Full supervision functionality achieved with no capacitors, resistors, or diodes - improves long-term reliability and reduces assembly cost. |
Applications
| Industrial Controllers | Embedded Data Loggers |
|---|---|
|
Use Scenario: Programmable logic controllers (PLCs) operating in factory-floor environments with fluctuating 5V rails and EMI-induced software hangs. IC Role / Device Role / Timing Role: Supervisory IC providing brownout detection, hardware-initiated reset, and watchdog-triggered recovery to prevent system lockup. Use Value: Ensures deterministic restart within 250ms after power recovery or ST timeout - maintaining process continuity and data integrity. |
Use Scenario: Battery-powered environmental sensors logging temperature/humidity at fixed intervals, deployed in remote locations for months. IC Role / Device Role / Timing Role: Low-power (50–200µA) supervisor enabling reliable wake-up and reset during cold-start or brownout events. Use Value: Prevents corrupted flash writes by holding reset until VCC stabilizes above 4.62V and sustaining it ≥250ms - preserving stored calibration data. |
| Medical Diagnostic Instruments | Test & Measurement Equipment |
|
Use Scenario: Portable ultrasound or ECG units requiring fail-safe boot sequencing and software crash recovery under variable battery discharge profiles. IC Role / Device Role / Timing Role: Dual-reset-output supervisor interfacing with ARM Cortex-M host and analog front-end ASICs. Use Value: Active-low RST drives analog subsystem enable while active-high RST controls digital processor - enabling staged power-up and isolation of fault domains. |
Use Scenario: Benchtop oscilloscopes and spectrum analyzers where firmware crashes must not require manual power cycle. IC Role / Device Role / Timing Role: Watchdog timer with 600ms timeout (TD = open) monitors main CPU's heartbeat signal (ST pin) during acquisition loops. Use Value: Forces controlled reboot before memory corruption occurs - reducing mean time to recovery (MTTR) from minutes to <300ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT46D3+ | Fixed 4.63V reset threshold; no TOL pin; no watchdog timer; 200ms reset pulse; SOT23-3 package. | Suitable only for basic power-monitoring-only use; lacks software supervision capability. | Select when watchdog functionality is unnecessary and board space is constrained. |
| TPS3808G33DBVR | Fixed 3.3V supply monitoring; adjustable delay (0–10s); no manual reset input; 6-pin SOT23 package. | Designed for lower-voltage systems; incompatible with +5V VCC supervision or PBRST-driven field service reset. | Choose only for 3.3V μP systems requiring long-delay reset; not a functional substitute for MAX1232EWE+T. |
Compared with MAX6326UT46D3+ and TPS3808G33DBVR, the MAX1232EWE+T uniquely combines dual-threshold VCC monitoring, programmable watchdog timing, and debounced manual reset in a single 16-pin wide SO package - making it the only option among the three capable of full-featured supervision for industrial +5V microprocessor systems.
Availability
MAX1232EWE+T is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic instruments, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1232EWE+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 industrial, communications, and computing applications.
The MAX1232EWE+T belongs to Maxim's microprocessor supervisory product line, engineered specifically to replace legacy DS1232 devices with enhanced accuracy, lower power, and flexible watchdog configuration for demanding embedded systems.
FAQ
What is the operating temperature range of the MAX1232EWE+T?
The MAX1232EWE+T is rated for operation from –40°C to +85°C, making it suitable for industrial environments where ambient temperatures exceed commercial-grade limits. This range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet. The device maintains full specification compliance across this entire range without derating, and its 16-pin wide SO package supports thermal dissipation under sustained load conditions. MAX1232EWE+T meets industrial qualification standards for temperature cycling and long-term reliability.
How does the MAX1232EWE+T select between 5% and 10% VCC tolerance?
The MAX1232EWE+T selects VCC tolerance via the TOL pin: connecting TOL to GND sets the trip point to 4.62V (5% of 5V), while connecting TOL to VCC sets it to 4.37V (10%). These thresholds are guaranteed across temperature and supply variation, with typical values listed in the DC Electrical Characteristics table. The MAX1232EWE+T uses internal precision references to achieve this selectability without external resistors. This dual-threshold capability allows one footprint to serve multiple power-rail stability requirements.
Does the MAX1232EWE+T require external components to function?
No, the MAX1232EWE+T requires no external components for full operation - including voltage monitoring, watchdog timing, and manual reset functionality. Its internal pull-up on PBRST, precision bandgap reference, and oscillator-free watchdog design eliminate the need for capacitors, resistors, or timing crystals. This zero-external-component requirement is explicitly stated in the Features section and verified in the Typical Operating Circuit diagram. MAX1232EWE+T simplifies layout, reduces BOM count, and improves field reliability versus discrete supervision solutions.
What is the function of the TD pin on the MAX1232EWE+T?
The TD pin on the MAX1232EWE+T configures the watchdog timer timeout period: grounding TD yields 150ms, leaving TD open yields 600ms, and tying TD to VCC yields 1.2s. This selection is implemented via internal resistor ladder and comparator circuitry, with all three settings guaranteed across temperature. The watchdog triggers only on falling edges of the ST input, and the timeout begins at the last detected edge. MAX1232EWE+T's TD-based configuration avoids firmware dependencies and enables hardware-level timing control.
Can the MAX1232EWE+T replace the DS1232 directly?
Yes, the MAX1232EWE+T is explicitly described as a plug-in upgrade for the Dallas DS1232, with identical pinout in 8-pin PDIP/SO packages. However, the MAX1232EWE+T itself is the 16-pin wide SO variant - so direct replacement requires matching package type. For 16-pin layouts, MAX1232EWE+T offers enhanced features (lower power, adjustable tolerance, programmable watchdog) over DS1232. MAX1232EWE+T retains functional compatibility while improving performance and flexibility in industrial designs.
MAX1232EWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- 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 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:
- 16-SOIC
MAX1232EWE+T FAQ
1.How can I place an order for MAX1232EWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1232EWE+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 MAX1232EWE+T reliable?
The price and inventory of MAX1232EWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1232EWE+T is usually 5 days.
3.What payment methods are accepted for MAX1232EWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1232EWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1232EWE+T?
MAX1232EWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1232EWE+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 MAX1232EWE+T?
For technical support, including MAX1232EWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1232EWE+T requirements.
6.How does Aetrix verify that MAX1232EWE+T is sourced from the original manufacturer or authorized distributors?
All MAX1232EWE+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 MAX1232EWE+T meets industry standards.
7.What is the process for return or replacement of MAX1232EWE+T?
All MAX1232EWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1232EWE+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 MAX1232EWE+T part is unused and in its original packaging.
Return procedure for MAX1232EWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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