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Analog Devices Inc./Maxim Integrated DS1233A-15
- Part No.:
- DS1233A-15
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
DS1233A-15.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,814
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Product details
Overview
DS1233A-15 from Maxim Integrated is a 3.3V precision voltage-monitoring microprocessor supervisory circuit with pushbutton reset control, 2.72V nominal VCC trip point (±15% tolerance), 350ms reset timeout, and internal 5kΩ pull-up resistor. It monitors power supply integrity and external reset button in embedded microcontroller systems requiring reliable power-on and brownout reset.
For engineers reviewing the DS1233A-15 datasheet, DS1233A-15 pinout, DS1233A-15 application, or DS1233A-15 equivalent, key selection criteria include VCC trip accuracy (2.64–2.80V), reset pulse duration (250–450ms), pushbutton debounce timing (250–450ms), operating temperature range (–40°C to +85°C), and TO-92/SOT-223 package compatibility.
Technical Context
The DS1233A-15 implements dual independent monitoring functions: a precision temperature-compensated voltage comparator detects VCC falling below 2.64–2.80V (15% threshold), and a debounced input circuit senses low-going edges on the RST pin for external pushbutton override. Both paths trigger a guaranteed 250–450ms active-low reset pulse.
Its internal architecture integrates a reference generator, comparator, monostable timer, and open-drain output driver with built-in 3.75–6.25kΩ pull-up. No external RC network is required for basic operation, though a 100pF–0.01μF capacitor between RST and GND is mandatory for pushbutton functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.64V to 2.80V - defines brownout detection threshold for 3.3V ±15% supply |
| Reset Timeout | 250–450ms - ensures stable power and processor initialization before release |
| Pushbutton Debounce | 250–450ms - eliminates mechanical switch bounce without external circuitry |
| Operating Temp | –40°C to +85°C - supports industrial-grade embedded deployment |
| Supply Current | 50μA - enables ultra-low-power system monitoring during standby |
| Output Drive | 8mA sink at 0.4V - directly drives standard TTL/CMOS reset inputs |
| Internal Pull-Up | 3.75–6.25kΩ - provides default high state on RST when not actively driven |
Pinout & Package
DS1233A-15 is available in TO-92 (3-pin) and SOT-223 (4-pin) packages. The TO-92 variant uses pins 1 (GND), 2 (RST), and 3 (VCC); the SOT-223 adds pin 4 as secondary GND for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 (TO-92) / PIN 1 (SOT-223) | Ground | Primary return path for internal reference and comparator circuits |
| PIN 2 (TO-92) / PIN 2 (SOT-223) | Reset Output | Open-drain active-low reset signal; accepts external pushbutton connection |
| PIN 3 (TO-92) / PIN 3 (SOT-223) | VCC Supply | Power input (1.2–5.5V); monitored for out-of-tolerance conditions |
| PIN 4 (SOT-223 only) | Ground | Secondary ground terminal for improved thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Voltage Reference | Precision temperature-compensated bandgap reference enables stable 15% trip accuracy across –40°C to +85°C |
| Single-Pin Pushbutton Interface | RST pin serves dual role: reset output and debounced pushbutton input-no extra I/O required |
| Guaranteed Reset Pulse Width | 250–450ms minimum ensures reliable microprocessor initialization after power recovery or manual reset |
| No External Timing Components | Monolithic timer eliminates need for external RC networks, reducing BOM count and layout area |
| Low Quiescent Current | 50μA typical ICC allows continuous monitoring in battery-backed or energy-constrained systems |
Applications
| Industrial PLC Controller | Medical Diagnostic Handheld |
|---|---|
Use Scenario: Power interruption during firmware update or sensor calibration sequence. IC Role / Device Role / Timing Role: DS1233A-15 asserts reset during brownout and holds it 350ms post-recovery to prevent corrupted register writes. Use Value: Prevents flash memory corruption and ensures deterministic boot state after unstable AC line events. | Use Scenario: User-initiated hard reset during ECG waveform freeze or display lockup. IC Role / Device Role / Timing Role: DS1233A-15 debounces mechanical button press and delivers clean 350ms reset pulse to MCU. Use Value: Eliminates spurious resets from contact bounce while guaranteeing full processor restart. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Rapid voltage sag during load dump or battery disconnect in utility metering. IC Role / Device Role / Timing Role: DS1233A-15 detects VCC drop below 2.64V and maintains reset until stable 3.3V rail is restored and held for ≥350ms. Use Value: Avoids false metering data commits and preserves EEPROM integrity during transient grid events. | Use Scenario: Ignition cycling causing repeated 12V-to-3.3V regulator transients in BCM sub-system. IC Role / Device Role / Timing Role: DS1233A-15 monitors 3.3V domain and enforces minimum reset hold time regardless of VCC slew rate. Use Value: Ensures microcontroller completes safe shutdown and avoids undefined peripheral states during power ramp. |
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 | Fixed 3.08V reset threshold; no pushbutton interface; SOT-23-3 package | Single-function power monitor only; requires separate reset button circuit | Select when only power monitoring is needed and board space is constrained |
| TPS3808G15DBVR | Adjustable reset threshold via external resistor divider; 200ms min reset timeout; higher ICC (1.2μA) | Supports custom trip points but lacks integrated pushbutton debounce logic | Select when precise VCC threshold tuning is required and external debounce is acceptable |
Compared with MAX809SEUR+T and TPS3808G15DBVR, the DS1233A-15 uniquely combines 3.3V ±15% monitoring, pushbutton debounce, and 350ms reset hold in one TO-92/SOT-223 device-reducing component count where both power and manual reset supervision are mandatory.
Availability
DS1233A-15 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for DS1233A-15 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, computing, and communications systems.
The DS1233A-15 belongs to Maxim's EconoReset™ supervisory family, engineered to replace discrete reset circuits with integrated voltage monitoring, pushbutton handling, and timing-all in minimal footprint packages.
FAQ
What is the exact VCC trip voltage range for DS1233A-15?
The DS1233A-15 has a guaranteed VCC trip point range of 2.64V to 2.80V at +25°C, corresponding to 3.3V supply with ±15% tolerance. This range is maintained across the full operating temperature range (–40°C to +85°C) due to its precision temperature-compensated voltage reference. The DS1233A-15 does not support adjustable thresholds-it is factory-trimmed to this fixed 15% window.
Does DS1233A-15 require an external capacitor for pushbutton operation?
Yes, DS1233A-15 requires a capacitor of 100pF to 0.01μF connected between the RST pin and ground to enable proper pushbutton debounce functionality. Without this capacitor, the internal debounce circuit cannot reliably detect button release. For applications needing higher reset current drive, a minimum 500pF capacitor plus a parallel 1kΩ external pull-up resistor is recommended.
Can DS1233A-15 be used with a 5V microcontroller system?
No, DS1233A-15 is specifically designed for 3.3V systems and monitors VCC within 2.64–2.80V. Using it with a 5V supply will cause immediate assertion of reset and prevent normal operation. For 5V systems, consider DS1233-15 (4.0–4.24V trip) or DS1233D-15-both are functionally identical but calibrated for 5V rails.
What is the maximum sink current capability of the DS1233A-15 RST output?
The DS1233A-15 RST output can sink up to +8mA while maintaining VOL ≤ 0.4V, meeting standard TTL and CMOS input low-level requirements. This allows direct interfacing with most microcontrollers without external buffer stages. The internal 3.75–6.25kΩ pull-up resistor ensures defined high-state behavior when the output is inactive.
How does DS1233A-15 handle rapid VCC fluctuations during power-up?
DS1233A-15 incorporates hysteresis and slew-rate immunity: it ignores VCC transitions faster than 300μs (2.85V → 2.3V) and guarantees reset remains active for ≥250ms after VCC returns to tolerance. This prevents chatter during noisy power ramp-up. The DS1233A-15 also enforces a minimum 250ms reset pulse even if VCC stabilizes instantly-ensuring robust microprocessor initialization.
DS1233A-15 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.72V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 250ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
DS1233A-15 FAQ
1.How can I place an order for DS1233A-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1233A-15 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 DS1233A-15 reliable?
The price and inventory of DS1233A-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1233A-15 is usually 5 days.
3.What payment methods are accepted for DS1233A-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1233A-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1233A-15?
DS1233A-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1233A-15 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 DS1233A-15?
For technical support, including DS1233A-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1233A-15 requirements.
6.How does Aetrix verify that DS1233A-15 is sourced from the original manufacturer or authorized distributors?
All DS1233A-15 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 DS1233A-15 meets industry standards.
7.What is the process for return or replacement of DS1233A-15?
All DS1233A-15 units undergo pre-shipment inspection (PSI). If there is an issue with DS1233A-15, 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 DS1233A-15 part is unused and in its original packaging.
Return procedure for DS1233A-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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