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Analog Devices Inc./Maxim Integrated MAX1232EWE+
- Part No.:
- MAX1232EWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX1232EWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
MAX1232EWE+ from Maxim Integrated is a microprocessor supervisory circuit that monitors +5V power supply voltage, provides 250ms reset pulse width, implements programmable watchdog timeout (150ms/600ms/1.2s), and features debounced manual reset input - all in a 16-pin wide SO package for industrial-grade operation from –40°C to +85°C. It serves as a plug-in upgrade to DS1232 in embedded controllers requiring reliable brownout detection and software execution monitoring.
For engineers reviewing the MAX1232EWE+ datasheet, MAX1232EWE+ pinout, MAX1232EWE+ application, or MAX1232EWE+ equivalent, key selection criteria include VCC trip point tolerance selection (5% or 10%), dual active-high/active-low reset outputs, watchdog timebase configuration via TD pin, and compatibility with lead-free PCB assembly processes.
Technical Context
The MAX1232EWE+ integrates three core supervision functions: precision voltage monitoring with digitally selectable 5% (4.62V typ) or 10% (4.37V typ) VCC trip points, a falling-edge-triggered watchdog timer with three timeout options determined by TD pin state, and a debounced pushbutton reset input (PBRST) that ignores transients <1ms 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 microcontroller reset inputs requiring pull-up. No external components are required for basic operation, and internal 100µA pull-up on PBRST eliminates need for external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5V to +5.5V - supports standard 5V systems with ±10% regulation margin. |
| VCC Trip Point | 4.62V (5% tol, TOL = GND) or 4.37V (10% tol, TOL = VCC) - enables precise brownout threshold selection without external resistors. |
| Reset Pulse Width | 250ms minimum - ensures sufficient time for power supply and µP stabilization after power-up/down/brownout. |
| Watchdog Timeout | 150ms (TD = 0V), 600ms (TD = open), or 1.2s (TD = VCC) - configurable software execution monitoring window. |
| Operating Current | 50µA to 200µA - ultra-low quiescent current enables use in battery-backed or low-power systems. |
| PBRST Input Delay | 1ms to 20ms - debounced response prevents false resets from mechanical switch bounce. |
| Temperature Range | –40°C to +85°C - qualified for industrial environments without derating. |
Pinout & Package
MAX1232EWE+ is housed in a 16-pin wide SO (SOIC-W) package with 0.300" body width and standard 0.050" pitch. Pin 1 is located at the top-left corner adjacent to the index mark; pins are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 10, 12, 14, 16 | N.C. | No internal connection - must be left unconnected; no routing or grounding required. |
| 2 | PBRST | Debounced active-low manual reset input - ignores <1ms glitches; requires ≥20ms low pulse to guarantee reset assertion. |
| 4 | TD | Watchdog timebase select - logic level determines timeout: 0V → 150ms, open → 600ms, VCC → 1.2s. |
| 6 | TOL | Tolerance select input - GND → 5% trip (4.62V), VCC → 10% trip (4.37V). |
| 8 | GND | Analog/digital ground reference - single ground plane recommended for noise immunity. |
| 9 | RST | Active-high reset output (push-pull) - drives high/low directly; sinks up to 12mA, sources up to 1mA. |
| 11 | RST | Active-low reset output (open-drain) - requires external pull-up; sinks up to 10mA. |
| 13 | ST | Watchdog strobe input - falling-edge triggered; must be toggled within selected timeout period to prevent reset. |
| 15 | VCC | +5V power supply input - operates over 4.5V–5.5V; includes internal voltage detector and bandgap reference. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | RST (push-pull, active-high) and RST (open-drain, active-low) enable simultaneous interface with diverse µP reset architectures without level-shifting. |
| Digitally selectable VCC tolerance | 5% or 10% trip point chosen via single TOL pin connection - eliminates external resistor networks and calibration effort. |
| Three-tier programmable watchdog | Hardware-configurable timeout (150ms/600ms/1.2s) via TD pin - supports varying software loop timing without firmware changes. |
| Integrated PBRST debouncing | On-chip RC filtering and digital logic eliminate need for external RC network or Schmitt trigger - reduces BOM count and board space. |
| Zero-external-component operation | Full supervision functionality achieved with no external capacitors, resistors, or diodes - simplifies layout and improves long-term reliability. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
|
Use Scenario: Microcontroller-based programmable logic controllers operating in factory-floor environments with fluctuating 5V rail stability. IC Role / Device Role / Timing Role: Power-supply supervisor and watchdog timer ensuring deterministic reset behavior during voltage sags or software hangs. Use Value: Prevents spurious I/O activation or corrupted data logging by enforcing 250ms minimum reset hold time and validating continuous ST strobing. |
Use Scenario: Portable ultrasound or patient monitor units where firmware integrity and power-on reliability are safety-critical. IC Role / Device Role / Timing Role: Dual-reset-output supervisor providing redundant reset signaling to main µP and safety-monitoring co-processor. Use Value: Enables independent reset control paths (RST for primary processor, RST for watchdog co-processor) while sharing one voltage detection circuit. |
| Automated Test Equipment (ATE) | Energy Metering Gateways |
|
Use Scenario: Rack-mounted test instruments performing automated calibration sequences under variable line conditions. IC Role / Device Role / Timing Role: Brownout detector and manual reset handler for field-serviceable units requiring user-initiated reinitialization. Use Value: Debounced PBRST input rejects switch bounce during technician reset actions, preventing unintended partial reboots or state corruption. |
Use Scenario: Smart electricity meters deployed in utility substations with wide ambient temperature swings and noisy 5V supplies. IC Role / Device Role / Timing Role: Industrial-grade supervisory IC maintaining µP reset integrity across –40°C to +85°C with no performance degradation. Use Value: Guarantees valid reset assertion even during rapid VCC slew rates (≥1.66mV/sec), critical for accurate energy accumulation during grid transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US46D3+ | Single active-low reset output; fixed 4.63V trip; no watchdog or manual reset input. | Suitable only for basic power-on reset; lacks software supervision and user-initiated reset capability. | Select when only VCC monitoring is needed and board space is constrained (SOT23-3 package). |
| TPS3808G33DBVR | Adjustable reset threshold (0.4V–5V); fixed 200ms reset timeout; no dual reset outputs or watchdog. | Requires external resistor divider for threshold setting; lacks ST/PBRST/WD functionality. | Choose for flexible voltage monitoring in mixed-rail systems but not for µP watchdog or manual reset requirements. |
Compared with MAX6326US46D3+ and TPS3808G33DBVR, the MAX1232EWE+ uniquely combines dual reset polarity, programmable watchdog timeout, and debounced manual reset in a single industrial-grade device - making it irreplaceable for applications demanding full µP housekeeping without external components.
Availability
MAX1232EWE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automated test equipment, energy metering gateways, and other applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1232EWE+ 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, computing, and consumer applications.
The MAX1232EWE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically to replace legacy DS1232-style supervisors with enhanced reliability, lower power, and simplified design - targeting embedded systems where power integrity and software execution assurance are mission-critical.
FAQ
What is the operating temperature range for the MAX1232EWE+?
The MAX1232EWE+ is rated for industrial operation from –40°C to +85°C. This range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet. The "E" suffix explicitly denotes this extended temperature grade, and the device maintains full DC and AC electrical specifications across the entire range without derating. All timing parameters - including reset pulse width, watchdog timeout, and PBRST delay - are guaranteed over –40°C to +85°C.
How does the MAX1232EWE+ select between 5% and 10% VCC tolerance?
The MAX1232EWE+ selects VCC tolerance using the TOL pin: connect TOL to GND for 5% tolerance (trip point ≈4.62V) or to VCC for 10% tolerance (trip point ≈4.37V). This selection is implemented internally via comparator reference scaling and requires no external components. The trip voltage tolerances are specified in the DC Electrical Characteristics table, with min/typ/max values provided for both configurations. The MAX1232EWE+ does not support analog or resistor-based threshold adjustment.
Can the MAX1232EWE+ be used as a direct replacement for the DS1232?
Yes, the MAX1232EWE+ is explicitly described in its General Description as a "plug-in upgrade of the Dallas DS1232". Pin compatibility is confirmed across the 8-pin PDIP/SO variants, and the 16-pin wide SO version (MAX1232EWE+) maintains identical functional pin assignments for all active signals (PBRST, TD, TOL, GND, RST, RST, ST, VCC) in pins 2, 4, 6, 8, 9, 11, 13, and 15. The additional N.C. pins in the wide SO package do not affect interoperability.
What is the function of the TD pin on the MAX1232EWE+?
The TD pin on the MAX1232EWE+ configures the watchdog timer timeout period: connecting TD to GND selects 150ms, leaving TD open selects 600ms, and connecting TD to VCC selects 1.2s. This is a hardware-selectable, non-volatile setting - no register writes or initialization sequence is required. The TD pin is sampled at power-up and remains latched; changes during operation have no effect until the next power cycle. The timeout values are guaranteed across temperature and supply voltage per the AC Electrical Characteristics table.
Does the MAX1232EWE+ require external components for basic operation?
No, the MAX1232EWE+ requires no external components for full supervision functionality. Its internal voltage reference, precision comparators, watchdog oscillator, and PBRST debouncing circuitry are fully integrated. The datasheet states "The MAX1232 requires no external components", and this is validated across all operating conditions. External pull-ups are optional only for the open-drain RST output; the push-pull RST output drives actively without external biasing.
MAX1232EWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- 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 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+ FAQ
1.How can I place an order for MAX1232EWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1232EWE+ 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+ reliable?
The price and inventory of MAX1232EWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1232EWE+ is usually 5 days.
3.What payment methods are accepted for MAX1232EWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1232EWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1232EWE+?
MAX1232EWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1232EWE+ 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+?
For technical support, including MAX1232EWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1232EWE+ requirements.
6.How does Aetrix verify that MAX1232EWE+ is sourced from the original manufacturer or authorized distributors?
All MAX1232EWE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1232EWE+?
All MAX1232EWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1232EWE+, 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+ part is unused and in its original packaging.
Return procedure for MAX1232EWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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