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Texas Instruments TPS3305-18DRG4
- Part No.:
- TPS3305-18DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3305-18DRG4.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,202
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Product details
Overview
TPS3305-18DRG4 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 operation from 2.7 V to 6 V supply. It delivers active-low and active-high RESET outputs and supports manual reset (MR) and watchdog input (WDI) for robust power sequencing in portable and industrial applications.
For engineers reviewing the TPS3305-18DRG4 datasheet, TPS3305-18DRG4 pinout, TPS3305-18DRG4 application, or TPS3305-18DRG4 equivalent, key selection criteria include dual-rail threshold accuracy (2.93 V / 1.68 V), micropower consumption (40 µA max), guaranteed RESET assertion down to VDD ≥ 1.1 V, and compatibility with SOIC-8 packaging for legacy board integration.
Technical Context
The TPS3305-18DRG4 implements independent voltage sensing on two inputs (SENSE1 and SENSE2) with temperature-compensated reference circuitry, enabling simultaneous monitoring of core (1.8 V) and I/O (3.3 V) supplies. Its internal logic asserts RESET when either input falls below its respective threshold (VIT–), with hysteresis (30 mV typ at 2.93 V) preventing chatter during rail recovery.
A dedicated watchdog timer monitors WDI toggling; failure to toggle within 1.6 s (typ) forces RESET assertion regardless of SENSEn status. The device integrates MR debouncing, propagation delays under 500 ns (MR→RESET), and output drive capability up to 5 mA sink/source - all while maintaining defined behavior across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised Voltages | 3.3 V (SENSE1) and 1.8 V (SENSE2) nominal; thresholds 2.93 V and 1.68 V (typ) - enables precise core/I/O rail supervision in DSP systems |
| Reset Delay Time | 200 ms (typ), factory-programmed - eliminates need for external timing capacitor and ensures reliable power-up sequencing |
| Watchdog Timeout | 1.6 s (typ) - provides fail-safe recovery window for firmware hangs without requiring system-level intervention |
| Supply Current | 40 µA (max) - supports battery-powered and energy-sensitive designs without compromising supervision integrity |
| VDD Operating Range | 2.7 V to 6 V - accommodates wide-input industrial and automotive power domains while maintaining full functionality |
| RESET Validity Threshold | VDD ≥ 1.1 V - guarantees deterministic reset assertion even during brownout conditions before full rail stabilization |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments without derating |
Pinout & Package
TPS3305-18DRG4 is packaged in an 8-pin SOIC (D) package, 3.9 mm × 4.9 mm body size, 1.75 mm max height, with gull-wing leads and RoHS-compliant NiPdAu finish. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1 (Pin 1) | Voltage sense input 1 | Monitors 3.3 V rail; asserts RESET if voltage drops below 2.93 V (typ); includes 30 mV hysteresis |
| SENSE2 (Pin 2) | Voltage sense input 2 | Monitors 1.8 V rail; asserts RESET if voltage drops below 1.68 V (typ); includes 30 mV hysteresis |
| WDI (Pin 3) | Watchdog timer input | Requires periodic toggle (≥ once per 1.6 s); absence triggers forced RESET independent of SENSEn status |
| GND (Pin 4) | Ground reference | Primary return path for internal reference, comparators, and output drivers; must be low-impedance |
| RESET (Pin 5) | Active-low reset output | Open-drain, 5 mA sink capability; pulled low during fault or reset delay; requires external pull-up |
| RESET (Pin 6) | Active-high reset output | Push-pull, 5 mA source/sink; driven high during fault or reset delay; no external pull-up needed |
| MR (Pin 7) | Manual reset input | Active-low; debounced internally; forces RESET assertion when asserted, overriding SENSEn and WDI states |
| VDD (Pin 8) | Supply voltage input | Power source for internal circuitry; valid from 2.7 V to 6 V; RESET remains functional down to 1.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of 3.3 V and 1.8 V rails with separate thresholds and hysteresis - eliminates need for two discrete supervisors |
| Integrated watchdog timer | 1.6 s timeout with WDI input - detects software lockups without external timing components or microcontroller intervention |
| No external capacitor required | Factory-programmed 200 ms reset delay - reduces BOM count, PCB area, and calibration variability |
| Guaranteed operation at low VDD | RESET assertion functional down to VDD = 1.1 V - ensures reliable reset during deep brownout or startup ramp |
| Low quiescent current | 40 µA maximum supply current - extends battery life in portable equipment and reduces thermal load in dense layouts |
Applications
| Processor Power Sequencing | DSP-Based Signal Processing |
|---|---|
Use Scenario: Coordinating power-up order between 3.3 V I/O and 1.8 V core rails in ARM Cortex-A/M series SoCs. IC Role / Device Role / Timing Role: Dual-rail supervisor enforcing minimum 200 ms hold-off on core enable until I/O rail stabilizes. Use Value: Prevents bus contention and configuration errors during boot by ensuring strict voltage sequencing compliance. | Use Scenario: Monitoring supply integrity in real-time audio/video DSP subsystems (e.g., TI C6000 family). IC Role / Device Role / Timing Role: Simultaneous detection of undervoltage on analog front-end (3.3 V) and digital core (1.8 V) supplies. Use Value: Enables immediate system halt and safe state entry before corrupted data processing occurs. |
| Industrial PLC Controller | Automotive Infotainment Module |
Use Scenario: Ensuring clean restart after line transients in programmable logic controller CPU modules. IC Role / Device Role / Timing Role: Combining MR-triggered reset with watchdog supervision to recover from both hardware faults and firmware stalls. Use Value: Eliminates need for external RC networks and improves MTBF through deterministic reset timing. | Use Scenario: Supervising dual-rail power domains in head-unit SoC platforms exposed to automotive battery fluctuations. IC Role / Device Role / Timing Role: Asserting RESET when either 3.3 V interface or 1.8 V core drops below spec, with hysteresis preventing false triggers. Use Value: Meets AEC-Q100 stress test requirements for supply monitoring reliability across temperature and voltage extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3305-18D | Same silicon, SOIC-8 tube-packaged variant (75 pcs/tube); identical electrical specs and pinout | No difference in circuit function or layout - only packaging and reel/tube format differs | Select TPS3305-18D for low-volume prototyping or small-batch production where tape-and-reel handling is unnecessary |
| TPS3808G18 | Single-supply supervisor (1.8 V only); no SENSE1 input or dual-rail capability; 200 ms delay also fixed but lacks watchdog timer | Cannot replace dual-monitoring requirement; suitable only if only 1.8 V rail needs supervision | Choose TPS3808G18 only when system architecture uses separate supervisors per rail and watchdog functionality is not required |
Compared with TPS3305-18D (same die, different packaging), TPS3305-18DRG4 offers tape-and-reel delivery optimized for automated assembly, while TPS3808G18 trades dual-rail capability and watchdog for lower cost and smaller footprint in single-rail applications - neither is pin-compatible nor functionally interchangeable with TPS3305-18DRG4 in dual-supply systems.
Availability
TPS3305-18DRG4 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive infotainment modules, and DSP-based signal processing equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for TPS3305-18DRG4 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 specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in power management and precision analog ICs.
The TPS3305 family was designed specifically for dual-rail power supervision in DSP and microprocessor systems, addressing the need for coordinated reset timing, watchdog safety, and low-power operation in space-constrained embedded applications.
FAQ
What is the exact reset threshold voltage for SENSE2 on the TPS3305-18DRG4?
The TPS3305-18DRG4 has a nominal SENSE2 threshold of 1.68 V (typical), with a specified range of 1.64 V to 1.72 V at 0°C to +85°C and 1.64 V to 1.73 V over the full –40°C to +85°C operating range. This threshold is factory-trimmed and temperature-compensated, ensuring stable 1.8 V rail monitoring across environmental conditions. The TPS3305-18DRG4 datasheet confirms this value in the ELECTRICAL CHARACTERISTICS table under VSENSE2 parameter.
Does the TPS3305-18DRG4 require an external capacitor for its reset delay function?
No, the TPS3305-18DRG4 does not require an external capacitor for its reset delay function. Its 200 ms (typical) power-on reset delay is factory-programmed and implemented entirely within the IC using internal timing circuitry. This eliminates component count, board area, and tolerance-related timing variation - a key design advantage confirmed in the FEATURES section and TIMING REQUIREMENTS table of the TPS3305-18DRG4 datasheet.
Can the TPS3305-18DRG4 monitor voltages other than 3.3 V and 1.8 V?
The TPS3305-18DRG4 is specifically trimmed for 3.3 V (SENSE1) and 1.8 V (SENSE2) nominal supervision, with fixed thresholds of 2.93 V and 1.68 V respectively. While it will respond to any voltage applied to SENSE1 or SENSE2 that crosses those thresholds, it is not user-adjustable or reconfigurable. For other voltage combinations, TI offers variants like TPS3305-25 (3.3 V / 2.5 V) or TPS3305-33 (5.0 V / 3.3 V), but the TPS3305-18DRG4 itself supports only its designated dual-rail pair.
What is the maximum watchdog timeout period for the TPS3305-18DRG4?
The maximum watchdog timeout period for the TPS3305-18DRG4 is 2.3 s, with a typical value of 1.6 s and minimum of 1.1 s, as specified in the TIMING REQUIREMENTS table under "tt(out) Watchdog time-out" parameter. This timeout is measured from the last WDI toggle edge and triggers RESET assertion if no subsequent toggle occurs - providing a deterministic safety window for firmware recovery. The TPS3305-18DRG4 datasheet confirms this across temperature and supply voltage conditions.
Is the TPS3305-18DRG4 pin-compatible with other devices in the TPS3305 family?
Yes, all TPS3305-x variants - including TPS3305-18DRG4, TPS3305-25, and TPS3305-33 - share identical pinout, package options (SOIC-8 and HVSSOP-8), and terminal functions. The only differences are factory-trimmed SENSE1/SENSE2 thresholds and part marking. This allows drop-in replacement across variants when adjusting for different rail voltages, provided the new thresholds meet system requirements. The TPS3305-18DRG4 functional block diagram and TERMINAL FUNCTIONS table confirm consistent pin assignments across the family.
TPS3305-18DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
TPS3305-18DRG4 FAQ
1.How can I place an order for TPS3305-18DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3305-18DRG4 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 TPS3305-18DRG4 reliable?
The price and inventory of TPS3305-18DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3305-18DRG4 is usually 5 days.
3.What payment methods are accepted for TPS3305-18DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3305-18DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3305-18DRG4?
TPS3305-18DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3305-18DRG4 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 TPS3305-18DRG4?
For technical support, including TPS3305-18DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3305-18DRG4 requirements.
6.How does Aetrix verify that TPS3305-18DRG4 is sourced from the original manufacturer or authorized distributors?
All TPS3305-18DRG4 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 TPS3305-18DRG4 meets industry standards.
7.What is the process for return or replacement of TPS3305-18DRG4?
All TPS3305-18DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3305-18DRG4, 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 TPS3305-18DRG4 part is unused and in its original packaging.
Return procedure for TPS3305-18DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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