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Texas Instruments TPS3305-18DG4
- Part No.:
- TPS3305-18DG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3305-18DG4.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,265
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Product details
Overview
TPS3305-18DG4 from Texas Instruments is a dual-voltage supervisor IC for DSP and processor-based systems, monitoring 3.3 V (SENSE1) and 1.8 V (SENSE2) rails with factory-programmed 200 ms reset delay, watchdog timeout of 1.6 s typ, and supply current ≤40 µA. It delivers active-low and active-high RESET outputs in an SOIC-8 package for core/I/O power sequencing in embedded computing.
For engineers reviewing the TPS3305-18DG4 datasheet, TPS3305-18DG4 pinout, TPS3305-18DG4 application, or TPS3305-18DG4 equivalent, this page provides verified electrical parameters, terminal functions, dual-threshold supervision behavior, watchdog timing, and real-world use cases in portable and industrial DSP platforms.
Technical Context
The TPS3305-18DG4 implements two independent voltage monitoring channels with temperature-compensated 1.25 V reference, hysteresis (15–40 mV), and precise threshold tolerances (±1.5% typ). Its internal oscillator drives both power-on reset and watchdog timer logic without external components.
RESET assertion occurs when either SENSE1 falls below 2.93 V or SENSE2 falls below 1.68 V, or when WDI remains static >1.6 s. After recovery, a fixed 200 ms delay ensures stable system initialization before deasserting RESET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised Voltages | SENSE1 = 3.3 V nominal (VIT+ = 2.93 V), SENSE2 = 1.8 V nominal (VIT+ = 1.68 V) |
| Reset Delay Time | 200 ms typ - ensures reliable power rail stabilization before releasing processor reset |
| Watchdog Timeout | 1.6 s typ - detects firmware lockup without requiring external timing components |
| Supply Current | 40 µA max - enables battery-backed operation in portable equipment |
| Operating Voltage Range | 2.7 V to 6 V - supports wide-input industrial and automotive power domains |
| Temperature Range | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
| Output Types | Active-low RESET and active-high RESET - simplifies interface to diverse processor reset inputs |
Pinout & Package
TPS3305-18DG4 is housed in an SOIC-8 (D) package, 3.9 mm × 4.9 mm × 1.75 mm, with gull-wing leads and RoHS-compliant NiPdAu finish. Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC MS-012AA standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1 (Pin 1) | Voltage monitor input 1 | Monitors 3.3 V rail; asserts RESET if voltage drops below 2.93 V |
| SENSE2 (Pin 2) | Voltage monitor input 2 | Monitors 1.8 V core rail; asserts RESET if voltage drops below 1.68 V |
| WDI (Pin 3) | Watchdog timer input | Must toggle ≥1/1.6 s; failure triggers RESET regardless of SENSEn status |
| GND (Pin 4) | Ground reference | Common return path for all analog and digital circuitry; requires low-impedance PCB connection |
| RESET (Pin 5) | Active-low reset output | Open-drain output; requires external pull-up for microcontroller reset input compatibility |
| RESET (Pin 6) | Active-high reset output | Push-pull output; directly drives FPGA or ASIC reset pins without pull-up |
| MR (Pin 7) | Manual reset input | Active-low; forces RESET assertion when pulled low, overriding all other conditions |
| VDD (Pin 8) | Supply voltage input | Power source for internal circuitry; operates from 2.7 V to 6 V; defined RESET output down to 1.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of I/O (3.3 V) and core (1.8 V) rails eliminates need for two discrete supervisors |
| No external capacitor required | Factory-programmed 200 ms reset delay removes timing capacitor, reducing BOM count and board area |
| Watchdog timer with 1.6 s timeout | Self-contained fault detection prevents software hang without MCU intervention or external RC network |
| Low quiescent current (40 µA) | Enables long-term operation in battery-powered systems such as handheld test equipment and remote sensors |
| Wide supply range (2.7–6 V) | Supports direct connection to unregulated 3.3 V or 5 V supplies, simplifying power architecture |
Applications
| Processor Power Sequencing | DSP-Based Signal Processing |
|---|---|
Use Scenario: Coordinating startup of 3.3 V I/O and 1.8 V core supplies in ARM Cortex-A8-based industrial controllers. IC Role / Device Role / Timing Role: Dual-threshold supervisor enforcing strict power-up order and holding reset until both rails stabilize. Use Value: Prevents latch-up and undefined state during boot by guaranteeing 200 ms minimum hold time after both SENSE1 and SENSE2 exceed thresholds. | Use Scenario: Ensuring reliable restart after brownout in TI C6000-series DSP audio analyzers. IC Role / Device Role / Timing Role: Watchdog-enforced reset generator detecting firmware stalls and initiating controlled recovery sequence. Use Value: Restores signal processing pipeline within 1.6 s of WDI inactivity, avoiding data corruption in real-time FFT pipelines. |
| Portable Test Equipment | Industrial Motor Control |
Use Scenario: Maintaining system integrity in handheld oscilloscope front-ends powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-current supervisor monitoring battery-derived 3.3 V and LDO-regulated 1.8 V rails under dynamic load. Use Value: 40 µA IDD extends battery life while ensuring immediate reset assertion during voltage sag caused by high-current ADC sampling bursts. | Use Scenario: Supervising isolated power rails in servo drive gate driver boards with separate 3.3 V logic and 1.8 V FPGA core supplies. IC Role / Device Role / Timing Role: Dual-rail monitor interfacing with opto-isolated MR input for safe manual reset during maintenance. Use Value: Enables field-serviceable reset via external pushbutton without exposing control logic to noisy motor power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3305-18D | Same silicon die, identical electrical specs; SOIC-8 package without G4 suffix (RoHS-compliant but unspecified lead finish) | No functional difference; D variant uses standard NiPdAu finish per TI's Package Option Addendum | Select TPS3305-18D when exact RoHS compliance documentation is not required or when legacy procurement channels prefer non-G4 ordering codes |
| MAX6816EUT+T | Single-supply supervisor (1.8 V only); no watchdog; 200 ms delay; SOT-23-6 package | Lacks dual-rail capability and WDI functionality; suitable only for single-rail 1.8 V systems | Choose MAX6816EUT+T only when supervising one rail and space-constrained layout prohibits SOIC-8; not a functional substitute for TPS3305-18DG4 |
Compared with TPS3305-18D, the TPS3305-18DG4 offers identical performance with explicit G4 marking confirming NiPdAu lead finish and full RoHS compliance; versus MAX6816EUT+T, it provides essential dual-rail monitoring and watchdog coverage required for DSP boot integrity.
Availability
TPS3305-18DG4 is available at Aetrix Electronics and suitable for industrial motor control, portable test equipment, and DSP-based signal processing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3305-18DG4 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.
The TPS3305 family was designed specifically for dual-rail power supervision in DSP and microprocessor systems, addressing the need for coordinated core/I/O voltage monitoring and fail-safe watchdog protection in resource-constrained embedded platforms.
FAQ
What is the exact reset threshold voltage for SENSE2 on the TPS3305-18DG4?
The TPS3305-18DG4 has a nominal SENSE2 threshold of 1.68 V (VIT+), with a typical tolerance of ±1.5% over –40°C to +85°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VSENSE2" parameter. The corresponding hysteresis is 15 mV, ensuring noise immunity during rail recovery. This threshold is fixed and not adjustable.
Does the TPS3305-18DG4 require an external capacitor for its reset delay function?
No, the TPS3305-18DG4 does not require an external capacitor for its reset delay function. Its 200 ms power-on reset delay is factory-programmed and implemented using internal timing circuitry. This eliminates component count, reduces PCB area, and improves timing consistency across temperature and voltage variations compared to RC-based solutions.
Can the TPS3305-18DG4 monitor voltages other than 3.3 V and 1.8 V?
The TPS3305-18DG4 is specifically configured for 3.3 V (SENSE1) and 1.8 V (SENSE2) supervision, with fixed internal thresholds of 2.93 V and 1.68 V respectively. It cannot be reconfigured for other voltage levels. For different combinations, TI offers TPS3305-25 (3.3 V / 2.5 V) and TPS3305-33 (5.0 V / 3.3 V) variants - each with dedicated threshold trimming.
What is the maximum supply voltage rating for the TPS3305-18DG4?
The absolute maximum supply voltage (VDD) for the TPS3305-18DG4 is +7 V, but its recommended operating range is 2.7 V to 6.0 V. Operation above 6 V risks exceeding safe dissipation limits and may compromise long-term reliability. The device guarantees defined RESET output behavior down to VDD = 1.1 V, enabling brownout detection in low-voltage scenarios.
How does the watchdog timer on the TPS3305-18DG4 interact with the voltage monitoring function?
The watchdog timer on the TPS3305-18DG4 operates independently of the SENSE1/SENSE2 comparators. If the WDI pin remains static for >1.6 s (typ), RESET is asserted regardless of whether both monitored rails are within specification. Recovery requires both WDI toggling and both SENSE inputs exceeding their thresholds, followed by the 200 ms delay - ensuring robust fault containment.
TPS3305-18DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.68V, 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS3305-18DG4 FAQ
1.How can I place an order for TPS3305-18DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3305-18DG4 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 TPS3305-18DG4 reliable?
The price and inventory of TPS3305-18DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3305-18DG4 is usually 5 days.
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TPS3305-18DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3305-18DG4 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 TPS3305-18DG4?
For technical support, including TPS3305-18DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3305-18DG4 requirements.
6.How does Aetrix verify that TPS3305-18DG4 is sourced from the original manufacturer or authorized distributors?
All TPS3305-18DG4 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 TPS3305-18DG4 meets industry standards.
7.What is the process for return or replacement of TPS3305-18DG4?
All TPS3305-18DG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3305-18DG4, 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 TPS3305-18DG4 part is unused and in its original packaging.
Return procedure for TPS3305-18DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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