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Analog Devices Inc./Maxim Integrated DS1233M-55+
- Part No.:
- DS1233M-55+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
DS1233M-55+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,460
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Product details
Overview
DS1233M-55+ from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring microprocessor supervisory circuit that provides active-low reset assertion during power failure or out-of-tolerance VCC conditions. It features a 4.5V to 4.75V high-trip threshold, 350ms minimum reset pulse width, internal 5kΩ pullup resistor, and operates from -40°C to +85°C in TO-92 or 8-pin SOIC packages - used in embedded microcontroller power sequencing for industrial control systems.
For engineers reviewing the DS1233M-55+ datasheet, DS1233M-55+ pinout, DS1233M-55+ application, or DS1233M-55+ equivalent, key selection criteria include VCC trip accuracy (±0.125V), guaranteed 350ms reset hold time after power recovery, compatibility with Motorola 68XXX/HC16 microprocessors, and pin-function equivalence to MC33064/MC34064 series.
Technical Context
The DS1233M-55+ integrates a temperature-compensated bandgap reference and comparator to monitor VCC against a fixed 4.625V nominal trip point (4.5V min / 4.75V max). It asserts RST low on undervoltage or power loss and holds reset active for 200–500ms after VCC returns to tolerance - ensuring stable microprocessor boot.
Its internal 5kΩ pullup eliminates external components for open-drain RST output drive, and it supports supply voltages from 1.2V to 5.5V while drawing only 50µA typical operating current. The device is functionally compatible with MC33064/MC34064 but offers tighter trip tolerance and guaranteed timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.5V to 4.75V (guaranteed window ensures reliable reset at 4.625V ±0.125V) |
| Reset Pulse Width | 200–500ms (ensures full stabilization of 5V logic and microprocessor clocks post-power-up) |
| Operating Current | 50µA typical (enables use in battery-backed or low-power standby modes) |
| Internal Pullup Resistor | 3.75–6.5kΩ (eliminates need for external pullup on RST line) |
| Supply Voltage Range | 1.2V to 5.5V (supports wide-input operation across legacy and modern 3.3V/5V systems) |
| Temperature Range | -40°C to +85°C (qualified for industrial-grade embedded environments) |
Pinout & Package
DS1233M-55+ is available in TO-92 (3-pin) and 8-pin SOIC packages. Pin functions are identical across variants: Pin 1 = RST (active-low open-drain reset output), Pin 2 = VCC (power supply input), Pin 3 = GND (ground). In SOIC, Pins 4–8 are no-connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Active-low reset output | Open-drain driver with internal 5kΩ pullup - directly interfaces to 68XXX/HC16 reset inputs without external components |
| VCC (Pin 2) | Power supply input | Monitored supply rail; trip detection occurs within 4.5–4.75V window - triggers reset if VCC falls below or rises above this band |
| GND (Pin 3) | Ground reference | Common return path for internal reference and comparator - must be low-impedance to ensure accurate trip point stability |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage trip | 4.625V ±0.125V - enables deterministic reset timing in 5V systems with tight supply regulation requirements |
| Guaranteed reset hold time | 200–500ms - ensures microprocessor core, PLLs, and memory controllers fully initialize before release |
| Integrated pullup resistor | 5kΩ typical - removes need for discrete pullup, reducing BOM count and PCB area in space-constrained designs |
| Motorola 68XXX/HC16 compatibility | Pin- and function-compatible with MC33064/MC34064 - allows drop-in replacement without firmware or layout changes |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Power interruption during real-time sensor data acquisition causes corrupted firmware state. IC Role / Device Role / Timing Role: DS1233M-55+ monitors 5V system rail and forces hard reset if VCC drops below 4.5V, holding RST low for ≥350ms after recovery. Use Value: Prevents execution of invalid code sequences by guaranteeing full microcontroller reinitialization after brownout events. | Use Scenario: Battery-backed ECG module requires fail-safe restart when AC adapter reconnects after outage. IC Role / Device Role / Timing Role: DS1233M-55+ detects VCC rise into tolerance and asserts reset for 350ms to synchronize analog front-end calibration and digital signal processor boot. Use Value: Eliminates manual reset button dependency and ensures deterministic startup sequence compliance with IEC 62304 safety requirements. |
| Automotive Body Control Module | Point-of-Sale Terminal |
Use Scenario: Load dump or alternator ripple causes transient VCC sag below 4.5V during vehicle ignition. IC Role / Device Role / Timing Role: DS1233M-55+ triggers immediate RST assertion and maintains reset until VCC stabilizes above 4.75V for ≥350ms. Use Value: Avoids CAN bus arbitration errors and EEPROM write corruption during unstable power transitions. | Use Scenario: Unplanned AC power loss during credit card transaction processing risks incomplete database commits. IC Role / Device Role / Timing Role: DS1233M-55+ detects VCC collapse and initiates controlled shutdown via microcontroller interrupt before final reset assertion. Use Value: Enables atomic transaction rollback and persistent state recovery using onboard SRAM backup powered by supercapacitor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 4.63V trip (±0.5%), 140ms min reset pulse, SOT-23-3 package, no internal pullup | Requires external 10kΩ pullup; shorter reset time limits use in systems needing >200ms stabilization | Preferred for ultra-small footprint designs where 140ms reset suffices and board space is critical |
| TPS3808G33DBVR | 3.3V fixed trip, adjustable delay (0–10s), 6-pin SOT-23, higher quiescent current (1.2µA) | Not pin-compatible; requires different PCB layout and supports programmable delay instead of fixed 350ms | Chosen when system-level reset timing must be tuned per application or multiple voltage rails require coordinated supervision |
Compared with MAX809SEUR+T and TPS3808G33DBVR, DS1233M-55+ delivers guaranteed 350ms reset hold and integrated pullup in a legacy-compatible 3-pin TO-92 or SOIC package - making it optimal for cost-sensitive industrial upgrades requiring direct MC34064 replacement without layout revision.
Availability
DS1233M-55+ is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostic equipment, automotive body electronics, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.
Supply support for DS1233M-55+ 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, automotive, and communications applications.
The DS1233M-55+ belongs to the EconoReset™ family of supervisory circuits engineered for reliable, low-cost power monitoring in microprocessor-based systems where deterministic reset behavior under brownout conditions is essential.
FAQ
What is the exact VCC trip voltage range for DS1233M-55+?
The DS1233M-55+ has a guaranteed VCC trip point range of 4.5V to 4.75V, with a typical value of 4.625V. This specification is validated across the full -40°C to +85°C operating temperature range and ensures consistent reset activation when the monitored 5V supply deviates beyond this window. DS1233M-55+ does not support adjustable or user-programmable trip points.
Does DS1233M-55+ require an external pullup resistor on the RST pin?
No, DS1233M-55+ includes an internal pullup resistor ranging from 3.75kΩ to 6.5kΩ, eliminating the need for an external component. This design simplifies circuit implementation and reduces BOM count. DS1233M-55+ drives RST as an open-drain output, and the internal pullup ensures proper logic-high level when reset is inactive.
Is DS1233M-55+ pin-compatible with MC34064?
Yes, DS1233M-55+ is pin-function compatible with the MC34064 in both TO-92 and SOIC packages. Its RST, VCC, and GND pins align directly, and its electrical behavior - including trip threshold, reset timing, and output drive - meets or exceeds MC34064 specifications. DS1233M-55+ can serve as a drop-in replacement in existing MC34064 designs.
What is the minimum reset pulse width guaranteed by DS1233M-55+?
DS1233M-55+ guarantees a minimum reset pulse width of 200ms, with a typical value of 350ms and a maximum of 500ms. This timing begins when VCC returns to within tolerance and ensures sufficient stabilization time for microprocessors, clock generators, and peripheral ICs before release. DS1233M-55+ does not offer programmable delay adjustment.
Can DS1233M-55+ operate with supply voltages below 3.3V?
Yes, DS1233M-55+ supports supply voltages from 1.2V to 5.5V, enabling use in low-voltage systems. However, its 4.5–4.75V trip threshold means it is intended for monitoring 5V rails - not for supervising sub-3.3V supplies. DS1233M-55+ will assert reset if VCC falls below 4.5V regardless of nominal system voltage, so proper rail assignment is critical.
DS1233M-55+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconoReset
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 200ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
DS1233M-55+ FAQ
1.How can I place an order for DS1233M-55+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1233M-55+ 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 DS1233M-55+ reliable?
The price and inventory of DS1233M-55+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1233M-55+ is usually 5 days.
3.What payment methods are accepted for DS1233M-55+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1233M-55+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1233M-55+?
DS1233M-55+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1233M-55+ 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 DS1233M-55+?
For technical support, including DS1233M-55+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1233M-55+ requirements.
6.How does Aetrix verify that DS1233M-55+ is sourced from the original manufacturer or authorized distributors?
All DS1233M-55+ 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 DS1233M-55+ meets industry standards.
7.What is the process for return or replacement of DS1233M-55+?
All DS1233M-55+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1233M-55+, 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 DS1233M-55+ part is unused and in its original packaging.
Return procedure for DS1233M-55+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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