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Analog Devices Inc./Maxim Integrated MAX1232CSA-TG068
- Part No.:
- MAX1232CSA-TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1232CSA-TG068.pdf
- Description:
- IC SUPERVISOR MICROPROC MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:465
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Product details
Overview
MAX1232CSA-TG068 from Maxim Integrated is an 8-pin SO microprocessor supervisory IC that monitors +5V supply voltage with selectable 5% or 10% tolerance (4.62V or 4.37V typical trip points), provides 250ms minimum reset pulse width, features a digitally programmable watchdog timer (150ms/600ms/1.2s), and includes a debounced manual reset input. It serves as a plug-in upgrade to the DS1232 in embedded μP systems requiring reliable power-on reset and software execution monitoring.
For engineers reviewing the MAX1232CSA-TG068 datasheet, MAX1232CSA-TG068 pinout, MAX1232CSA-TG068 application, or MAX1232CSA-TG068 equivalent, key selection considerations include its dual active-high/active-low reset outputs, no-external-components design, adjustable VCC trip point via TOL pin, and guaranteed 20ms PBRST recognition threshold for robust manual reset handling.
Technical Context
The MAX1232CSA-TG068 integrates three core supervision functions: precision voltage detection with user-selectable 5% or 10% VCC tolerance, a falling-edge-triggered watchdog timer with three timeout options determined by TD pin state (GND/open/VCC), and a debounced pushbutton reset input (PBRST) that ignores transients <1ms and guarantees recognition of ≥20ms pulses. Its RST output sources/sinks current while RST is open-drain.
It operates across 0°C to +70°C, requires no external components, and delivers 250ms minimum reset assertion during power-up, brownout, or manual reset events. The internal voltage reference and comparator ensure stable trip-point accuracy over temperature and supply variation, and the ST strobe input must be toggled on each falling edge to prevent timeout-induced reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5V to +5.5V - supports standard 5V rail with ±10% margin |
| VCC Trip Point | 4.62V (5% tol, TOL=GND) or 4.37V (10% tol, TOL=VCC) - factory-trimmed precision detection |
| Reset Pulse Width | 250ms minimum - ensures μP and peripherals fully stabilize before release |
| Watchdog Timeout | 150ms (TD=GND), 600ms (TD=open), or 1.2s (TD=VCC) - software execution monitoring flexibility |
| PBRST Recognition | ≥20ms low pulse required - rejects mechanical bounce and noise |
| Operating Current | 50µA to 200µA - ultra-low power vs. DS1232 (1/10th consumption) |
| Output Drive | RST: ±12mA push-pull; RST: 10mA open-drain sink - drives diverse reset logic interfaces |
Pinout & Package
MAX1232CSA-TG068 is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch and standard JEDEC MS-012 outline.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PBRST | Debounced active-low manual reset input; internal ~40kΩ pull-up to VCC; ignores <1ms glitches |
| 2 | TD | Watchdog timebase select: GND=150ms, open=600ms, VCC=1.2s timeout period |
| 3 | TOL | Tolerance select: GND=5% (4.62V), VCC=10% (4.37V) VCC trip point |
| 4 | GND | Analog/digital ground reference for all internal comparators and logic |
| 5 | RST | Active-high reset output; push-pull driver capable of sourcing/sinking up to 12mA |
| 6 | RST | Active-low open-drain reset output; requires external pull-up; sinks up to 10mA |
| 7 | ST | Watchdog strobe input; reset triggered if falling edge absent beyond selected timeout |
| 8 | VCC | +5V power supply input; monitored for brownout; absolute max −1V to +7V |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | RST (push-pull active-high) and RST (open-drain active-low) enable direct interface to both TTL and CMOS μP reset inputs without level-shifting |
| No External Components | Integrated voltage reference, comparator, watchdog oscillator, and debounce logic eliminate BOM cost and layout area |
| Selectable Brownout Threshold | 5% or 10% VCC tolerance set via single TOL pin connection - simplifies design for varying supply stability requirements |
| Guaranteed Manual Reset Timing | PBRST requires ≥20ms low pulse and asserts reset for ≥250ms - ensures deterministic system recovery regardless of button quality |
| Ultra-Low Power Operation | 50–200µA ICC - enables use in battery-backed or energy-constrained μP systems where DS1232 would drain excessively |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
|
Use Scenario: Programmable logic controllers operating in noisy factory environments with fluctuating 5V supplies. IC Role / Device Role / Timing Role: Supervisory IC providing brownout detection, watchdog-based firmware crash recovery, and operator-initiated reset via front-panel button. Use Value: Prevents erratic operation during voltage sags by holding μP in reset until VCC stabilizes for ≥250ms, and recovers from hung code via 600ms watchdog timeout. |
Use Scenario: Portable ultrasound or blood analyzer units requiring fail-safe boot integrity and battery-efficient supervision. IC Role / Device Role / Timing Role: Low-power (50µA) μP monitor ensuring correct initialization after battery insertion and detecting firmware lockups during long diagnostic runs. Use Value: Enables 150ms watchdog timeout for fast-recovery critical subsystems and eliminates external RC networks-reducing size and improving reliability. |
| Network Edge Routers | Automotive Infotainment Gateways |
|
Use Scenario: Carrier-grade Ethernet routers with multi-core processors needing coordinated reset sequencing and supply monitoring. IC Role / Device Role / Timing Role: Dual-output supervisor asserting both active-high and active-low reset signals to synchronize CPU, FPGA, and PHY initialization. Use Value: RST drives TTL-level reset; RST sinks current into microcontroller's open-drain reset pin - eliminating need for discrete MOSFET or buffer. |
Use Scenario: In-vehicle infotainment gateways exposed to wide temperature swings and load-dump transients on 5V rails. IC Role / Device Role / Timing Role: Precision voltage monitor with 4.37V (10%) trip point tolerating automotive cold-crank dips, plus debounced physical reset for service mode entry. Use Value: TOL tied to VCC selects 10% tolerance, allowing safe operation down to 4.25V while maintaining 250ms reset hold time for EEPROM write completion. |
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 | Single active-low open-drain reset only; fixed 2.93V threshold; no watchdog or manual reset | Suitable only for simple power-fail detection without software supervision | Choose when only basic undervoltage reset is needed and board space is constrained |
| TPS3808G12DBVR | Adjustable threshold (0.4–5.8V) via resistor divider; fixed 200ms reset timeout; no manual reset or watchdog | Requires external resistors; lacks PBRST and ST functionality for full μP housekeeping | Prefer when precise custom trip voltage is mandatory and watchdog/PB reset are handled elsewhere |
Compared with MAX1232CSA-TG068, the MAX6326 offers simpler, lower-cost reset-only supervision but omits watchdog and manual reset; the TPS3808 provides flexible threshold setting but adds external components and removes integrated supervision features - making MAX1232CSA-TG068 the only option combining all three functions in one 8-pin SO package.
Availability
MAX1232CSA-TG068 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, and network edge routers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1232CSA-TG068 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 high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.
The MAX1232CSA-TG068 belongs to Maxim's microprocessor supervisory product line, engineered specifically to replace legacy DS1232-style monitors with enhanced reliability, lower power, and integrated watchdog functionality for embedded μP systems.
FAQ
What is the function of the TOL pin on the MAX1232CSA-TG068?
The TOL pin on the MAX1232CSA-TG068 selects the VCC reset threshold tolerance: connecting TOL to GND sets a 5% trip point (typically 4.62V), while connecting it to VCC selects a 10% trip point (typically 4.37V). This allows system designers to match the reset threshold to their specific 5V supply stability requirements without external components. The MAX1232CSA-TG068 uses this pin to configure its internal voltage comparator reference, enabling field-flexible brownout protection.
Does the MAX1232CSA-TG068 require external components to operate?
No, the MAX1232CSA-TG068 requires no external components to perform its core supervision functions. All necessary circuitry-including the voltage reference, comparator, watchdog oscillator, debounce logic, and output drivers-is integrated internally. This eliminates the need for external RC networks, pull-up resistors (PBRST has an internal ~40kΩ pull-up), or threshold-setting resistors, reducing BOM count and PCB area. The MAX1232CSA-TG068 is designed for drop-in deployment in μP systems previously using the DS1232.
How does the watchdog timer on the MAX1232CSA-TG068 work?
The MAX1232CSA-TG068 watchdog timer monitors the ST (strobe) input and triggers reset if no falling edge occurs within the selected timeout period-150ms (TD=GND), 600ms (TD=open), or 1.2s (TD=VCC). It resets the μP by asserting both RST and RST outputs for ≥250ms. The timer is edge-sensitive (not level-sensitive), requiring periodic software toggling of ST. This ensures the MAX1232CSA-TG068 detects both hardware hangs and infinite-loop software failures.
What is the minimum pulse width required on PBRST to guarantee reset activation in the MAX1232CSA-TG068?
The MAX1232CSA-TG068 guarantees reset activation when the PBRST pin is held low for a minimum of 20ms, as specified in the datasheet's AC Electrical Characteristics table. Pulses shorter than 1ms are ignored due to internal debouncing. Once recognized, the reset outputs remain active for at least 250ms after PBRST returns high. This timing ensures reliable manual reset across mechanical switch variations and EMI noise. The MAX1232CSA-TG068's internal pull-up eliminates need for external resistors.
Can the MAX1232CSA-TG068 be used in automotive applications?
The MAX1232CSA-TG068 is rated for 0°C to +70°C operation (C-grade), making it suitable for under-hood-adjacent or cabin-mounted infotainment gateways where ambient temperatures stay within commercial range. It supports 10% VCC tolerance (4.37V trip) to withstand cold-crank dips, and its 250ms reset hold time accommodates EEPROM writes during power transitions. However, for under-hood engine control units requiring −40°C to +125°C, the MAX1232ESA or MAX1232MJA variants are recommended instead of the MAX1232CSA-TG068.
MAX1232CSA-TG068 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- 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-TG068 FAQ
1.How can I place an order for MAX1232CSA-TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1232CSA-TG068 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-TG068 reliable?
The price and inventory of MAX1232CSA-TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1232CSA-TG068 is usually 5 days.
3.What payment methods are accepted for MAX1232CSA-TG068?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1232CSA-TG068 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1232CSA-TG068?
MAX1232CSA-TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1232CSA-TG068 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-TG068?
For technical support, including MAX1232CSA-TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1232CSA-TG068 requirements.
6.How does Aetrix verify that MAX1232CSA-TG068 is sourced from the original manufacturer or authorized distributors?
All MAX1232CSA-TG068 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-TG068 meets industry standards.
7.What is the process for return or replacement of MAX1232CSA-TG068?
All MAX1232CSA-TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1232CSA-TG068, 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-TG068 part is unused and in its original packaging.
Return procedure for MAX1232CSA-TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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