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Analog Devices Inc./Maxim Integrated DS1233MS-55+
- Part No.:
- DS1233MS-55+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1233MS-55+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:173
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Product details
Overview
DS1233MS-55+ from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring microprocessor supervisory circuit that provides active-low reset assertion during power supply undervoltage or failure events. It features a 4.5 V to 4.75 V high-trip threshold, 350 ms minimum reset pulse width, internal 5 kΩ pullup resistor, and operates from 1.2 V to 5.5 V supply across –40°C to +85°C - used in embedded microcontroller power sequencing for industrial control modules.
For engineers reviewing the DS1233MS-55+ datasheet, DS1233MS-55+ pinout, DS1233MS-55+ application, or DS1233MS-55+ equivalent, key selection criteria include reset threshold accuracy, guaranteed 350 ms reset timeout, TO-92/SOIC package compatibility, VCC operating range down to 1.2 V, and pin-function equivalence with MC33064/MC34064 series.
Technical Context
The DS1233MS-55+ integrates a temperature-compensated voltage reference and comparator to detect VCC deviations beyond its factory-trimmed trip window (VHTL = 4.75 V, VLTL = 4.00 V). Its internal power-fail logic asserts RST low on out-of-tolerance detection and holds it active for ≥350 ms after VCC recovery.
It delivers rail-to-rail reset timing control without external RC components, supports 1.2 V minimum VCC operation, and includes an internal 5 kΩ pullup on RST - eliminating need for discrete pullup resistors in most 5 V microprocessor reset circuits compatible with Motorola 68XXX and HC16 families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.5 V (min), 4.625 V (typ), 4.75 V (max) - ensures reliable reset activation before 5 V systems enter unstable operating region |
| Reset Pulse Width | 200–500 ms (typ 350 ms) - guarantees sufficient stabilization time for microprocessor power-up and clock lock |
| Supply Voltage Range | 1.2 V to 5.5 V - enables use with low-voltage logic and legacy 5 V systems without level-shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded environments including PLCs and motor drives |
| Internal Pullup Resistor | 3.75–6.5 kΩ - eliminates external pullup component while maintaining TTL/CMOS-compatible RST drive strength |
| Output Sink Current | 8 mA (min) - sufficient to directly drive reset inputs of MC68HC11, HC16, and similar microcontrollers |
| Quiescent Current | 50 µA (max) - enables integration into battery-backed or ultra-low-power monitoring paths |
Pinout & Package
DS1233MS-55+ is available in 8-pin SOIC (150-mil) surface-mount package. Pinout matches industry-standard reset supervisor layout with dedicated RST, VCC, GND, and NC terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-Low Reset Output | Open-drain output asserted low during VCC fault or power-up; requires external pullup if not using internal 5 kΩ resistor |
| VCC | Power Supply Input | Monitored supply rail; device operates and monitors over 1.2–5.5 V range with no auxiliary bias required |
| GND | Ground Reference | Common return path for reference, comparator, and output stages; must be low-impedance for accurate trip-point stability |
| NC | No Connect | Four pins (pins 4–7 in SOIC) are unconnected die pads - no routing or termination required on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage threshold | Factory-trimmed 4.625 V typical trip point with ±125 mV tolerance - eliminates manual calibration in production test |
| Guaranteed reset timeout | 350 ms minimum active-reset duration - ensures full microprocessor initialization before release |
| Integrated pullup resistor | 5 kΩ internal RST pullup - reduces BOM count and PCB area vs. discrete 4.7 kΩ resistor solutions |
| Wide VCC operating range | 1.2 V to 5.5 V supply support - allows single part number across mixed-voltage designs (e.g., 3.3 V core + 5 V I/O) |
| Motorola 68XXX compatibility | Pin- and function-compatible with MC33064/MC34064 - enables drop-in replacement in legacy industrial controller designs |
Applications
| Industrial PLC Power Monitoring | Embedded Microcontroller Reset Control |
|---|---|
Use Scenario: Monitoring 5 V backplane supply in programmable logic controllers subject to brownout and transient noise. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset to ARM Cortex-M or Renesas RX microcontrollers during undervoltage events. Use Value: Prevents corrupted firmware execution by guaranteeing ≥350 ms reset hold time after VCC recovery - critical for deterministic boot sequence. | Use Scenario: Providing power-on reset for HC16-based motor control boards in HVAC systems. IC Role / Device Role / Timing Role: Precision reset generator with 4.625 V trip threshold synchronized to 5 V rail stabilization. Use Value: Eliminates need for external RC network and pullup resistor - reduces component count and improves long-term trip-point stability. |
| Legacy 68HC11 System Upgrade | Low-Power Sensor Node Supervision |
Use Scenario: Replacing aging MC34064 in field-deployed 68HC11-based instrumentation with extended temperature requirements. IC Role / Device Role / Timing Role: Pin-compatible reset supervisor delivering identical RST timing and trip behavior at lower quiescent current. Use Value: Enables direct PCB-level replacement without layout changes while improving thermal margin via –40°C to +85°C rating. | Use Scenario: Battery-powered environmental sensor node requiring reliable reset during Li-ion voltage sag. IC Role / Device Role / Timing Role: Low-current (50 µA) supervisor monitoring 3.3 V LDO output derived from declining battery voltage. Use Value: Maintains functional reset assertion down to 1.2 V VCC - extends usable battery life before system shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US31D3+ | Fixed 3.09 V reset threshold; 140 ms min reset timeout; SOT23-3 package | Designed for 3.3 V systems only; lacks internal pullup; shorter timeout may not meet processor requirements | Select when board space is constrained and 3.3 V reset timing suffices |
| TPS3808G33DBVR | Adjustable threshold via external resistor; 200 ms min timeout; 1.8–6 V VCC range; 1.6 µA quiescent current | Requires external resistor network; longer enable delay; optimized for ultra-low-power battery apps | Select when fine threshold tuning or sub-µA standby current is mandatory |
Compared with MAX6326US31D3+ and TPS3808G33DBVR, the DS1233MS-55+ offers fixed 4.625 V trip accuracy, guaranteed 350 ms reset hold, integrated pullup, and proven compatibility with 5 V microprocessor reset inputs - making it optimal for industrial control upgrades where reliability and drop-in fit are prioritized over ultra-low power or adjustable thresholds.
Availability
DS1233MS-55+ is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller reset, and legacy system maintenance requiring stable component supply and long-lifecycle availability.
Supply support for DS1233MS-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 and mixed-signal ICs for industrial, automotive, and communications applications.
The DS1233MS-55+ belongs to the EconoReset™ family of microprocessor supervisors - engineered specifically to replace discrete reset circuits in cost-sensitive, high-reliability embedded systems with minimal external components.
FAQ
What is the exact reset threshold voltage range for DS1233MS-55+?
The DS1233MS-55+ has a specified VCC trip point of 4.5 V (minimum), 4.625 V (typical), and 4.75 V (maximum), corresponding to its "-55" suffix designation. This range ensures robust detection of 5 V supply degradation before microprocessor operation becomes unreliable. The DS1233MS-55+ uses a precision temperature-compensated reference to maintain this accuracy across –40°C to +85°C.
Does DS1233MS-55+ require an external pullup resistor on the RST pin?
No, the DS1233MS-55+ includes an internal 5 kΩ pullup resistor on the RST pin, eliminating the need for an external component in standard 5 V microprocessor reset applications. This feature reduces BOM count and improves layout simplicity. The DS1233MS-55+ datasheet confirms RST output is open-drain with internal pullup enabled by default.
Is DS1233MS-55+ pin-compatible with MC34064?
Yes, the DS1233MS-55+ is explicitly pin- and function-compatible with the MC34064, as confirmed in its datasheet's "Pin function compatible with…" statement. Both devices share identical RST/VCC/GND pin assignments in SOIC packages, enabling direct replacement in legacy designs without PCB modification. The DS1233MS-55+ retains full electrical and timing equivalence for Motorola 68XXX-series microprocessor reset interfaces.
What is the minimum reset pulse width guaranteed by DS1233MS-55+?
The DS1233MS-55+ guarantees a minimum reset pulse width of 200 ms, with a typical value of 350 ms and maximum of 500 ms. This timing ensures sufficient stabilization time for microprocessors and associated peripherals after power-up or brownout recovery. The DS1233MS-55+ achieves this without external timing components, relying on internal monostable circuitry calibrated across temperature and voltage.
Can DS1233MS-55+ operate from a 3.3 V supply?
No, the DS1233MS-55+ is not rated for reliable operation from 3.3 V. Its trip threshold is fixed at ~4.6 V, and its recommended VCC operating range starts at 1.2 V but requires sufficient headroom above the trip point to assert reset correctly. For 3.3 V systems, use DS1233M-33+ or DS1233M-3+ variants. The DS1233MS-55+ is designed exclusively for 5 V nominal supply monitoring.
DS1233MS-55+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconoReset
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS1233MS-55+ FAQ
1.How can I place an order for DS1233MS-55+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1233MS-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 DS1233MS-55+ reliable?
The price and inventory of DS1233MS-55+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1233MS-55+ is usually 5 days.
3.What payment methods are accepted for DS1233MS-55+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1233MS-55+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1233MS-55+?
DS1233MS-55+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1233MS-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 DS1233MS-55+?
For technical support, including DS1233MS-55+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1233MS-55+ requirements.
6.How does Aetrix verify that DS1233MS-55+ is sourced from the original manufacturer or authorized distributors?
All DS1233MS-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 DS1233MS-55+ meets industry standards.
7.What is the process for return or replacement of DS1233MS-55+?
All DS1233MS-55+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1233MS-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 DS1233MS-55+ part is unused and in its original packaging.
Return procedure for DS1233MS-55+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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