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Texas Instruments TPS3306-15DGKR
- Part No.:
- TPS3306-15DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3306-15DGKR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,218
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Product details
Overview
TPS3306-15DGKR from Texas Instruments is a dual-voltage supervisory IC designed for DSP and microprocessor systems requiring independent monitoring of 3.3 V and 1.5 V rails. It provides power-on reset with 100 ms delay, watchdog timer (0.8 s timeout), open-drain RESET and PFO outputs, and operates from –40°C to +85°C in VSSOP-8 package.
For engineers reviewing the TPS3306-15DGKR datasheet, TPS3306-15DGKR pinout, TPS3306-15DGKR application, or TPS3306-15DGKR equivalent, this page delivers verified specifications, terminal functions, real-world use cases, and validated alternative parts for dual-rail power supervision in embedded control and portable electronics.
Technical Context
The TPS3306-15DGKR integrates two independent voltage comparators (SENSE1/SENSE2) with fixed thresholds of 2.93 V and 1.40 V (typ), respectively, enabling simultaneous supervision of 3.3 V and 1.5 V supplies. Its internal 100 ms reset delay timer ensures reliable system initialization after both rails exceed their thresholds.
A dedicated power-fail comparator (PFI/PFO) references an internal 1.25 V bandgap and supports external resistor networks for flexible low-battery or auxiliary supply monitoring. The watchdog circuit responds to WDI transitions and resets on timeout, with RESET asserted for full delay duration - all while consuming only 15 µA (typ) supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 2.7 V to 6 V - supports operation across wide input range including 3.3 V and 5 V systems. |
| SENSE1 threshold (VIT1) | 2.93 V (typ) - monitors 3.3 V rail with ±3% tolerance; asserts RESET if voltage drops below threshold. |
| SENSE2 threshold (VIT2) | 1.40 V (typ) - precisely supervises 1.5 V core supply; hysteresis ≥15 mV prevents chatter near trip point. |
| RESET delay time (td) | 100 ms (typ) - guarantees stable processor boot by holding reset until both supplies stabilize. |
| Watchdog timeout (tt(out)) | 0.8 s (typ) - detects firmware lockup; requires WDI transition within interval to prevent system reset. |
| Supply current (IDD) | 15 µA (typ) - ultra-low quiescent current enables use in battery-powered applications. |
| Operating temperature | –40°C to +85°C - qualified for industrial and automotive-adjacent embedded environments. |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 1.1 mm max height, 0.65 mm lead pitch, exposed thermal pad (non-electrical), RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE1 | Voltage sense input 1 | Monitors primary supply (e.g., 3.3 V); internally compared to 2.93 V reference. |
| 2 - SENSE2 | Voltage sense input 2 | Monitors secondary supply (e.g., 1.5 V); internally compared to 1.40 V reference. |
| 3 - PFI | Power-fail comparator input | Accepts external voltage divider output; trips when input falls below 1.25 V reference. |
| 4 - GND | Ground reference | Common return path for all analog and digital circuitry; must be low-impedance. |
| 5 - RESET | Active-low reset output | Open-drain output; pulled low during fault or power-up; requires external pull-up. |
| 6 - PFO | Power-fail output | Open-drain output; signals auxiliary supply failure; requires external pull-up. |
| 7 - WDI | Watchdog timer input | Edge-triggered; any transition (low→high or high→low) resets internal 0.8 s timer. |
| 8 - VDD | Supply voltage input | Primary power source (2.7–6 V); powers internal comparators, logic, and timers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 3.3 V and 1.5 V rails with fixed, factory-trimmed thresholds - eliminates need for external resistive dividers on main supplies. |
| Integrated 100 ms power-on reset timer | Ensures deterministic system startup by holding RESET active until both SENSE inputs exceed thresholds and timing window expires - no external RC required. |
| Configurable power-fail detection | PFI input referenced to precise 1.25 V internal bandgap allows monitoring of any voltage >1.25 V via external resistor network (e.g., battery, 5 V aux, or 2.5 V I/O rail). |
| Watchdog with 0.8 s timeout | Self-resetting timer detects software hangs; WDI accepts either edge - simplifies firmware implementation without dedicated clock source. |
| Ultra-low quiescent current | 15 µA typical supply current enables integration into always-on subsystems and battery-backed applications without significant drain. |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Dual-core DSP-based controller with separate 3.3 V I/O and 1.5 V core supplies operating in harsh factory environments. IC Role / Device Role / Timing Role: Supervisory IC providing synchronized power-on reset, continuous dual-rail monitoring, and watchdog safety net for firmware execution. Use Value: Prevents erratic behavior during brownouts by asserting RESET before either rail collapses; 100 ms delay ensures FPGA configuration completes before CPU release. |
Use Scenario: Battery-powered handheld ECG device with 3.3 V analog front-end and 1.5 V low-power MCU core. IC Role / Device Role / Timing Role: Voltage supervisor and low-battery detector using PFI to monitor battery voltage via resistor divider. Use Value: Triggers early warning via PFO before battery reaches critical level; 15 µA IDD extends runtime between charges without compromising supervision integrity. |
| Automotive Infotainment Head Unit | Network Edge Gateway |
Use Scenario: In-vehicle infotainment system with 3.3 V SoC I/O and 1.5 V DDR memory supply, subject to cold-crank transients. IC Role / Device Role / Timing Role: Dual-supply monitor ensuring safe boot sequence and detecting undervoltage on memory rail during engine start. Use Value: SENSE2's 1.40 V threshold provides margin against DDR3L minimum operating voltage (1.35 V); hysteresis prevents false resets during transient dips. |
Use Scenario: Industrial Ethernet gateway with isolated 3.3 V communication interface and 1.5 V microcontroller core, deployed in remote locations. IC Role / Device Role / Timing Role: System supervisor enforcing clean boot and detecting firmware stalls via WDI, with PFO signaling PoE supply degradation. Use Value: Watchdog timeout matches typical firmware task cycle time; open-drain outputs interface directly with optocouplers or logic-level translators for isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-15DR | Same electrical specs and functionality; SOIC-8 (D) package instead of VSSOP-8 (DGK). Larger footprint (3.9 mm × 4.9 mm vs. 3.0 mm × 3.0 mm), higher thermal resistance. | Preferred where board space is not constrained and legacy SOIC assembly lines are used; less suitable for high-density portable designs. | Select TPS3306-15DR for compatibility with existing SOIC footprints or where thermal dissipation via larger leads is advantageous. |
| TPS3808G15DBVR | Single-supply supervisor (1.5 V only), no SENSE1 input or PFI/PFO; includes enable input and adjustable delay; 1.5 µA IDD (lower than TPS3306-15DGKR). | Applicable only when monitoring one rail; lacks dual-rail coordination, watchdog, or power-fail capability - not drop-in compatible. | Choose TPS3808G15DBVR only for cost-sensitive single-rail applications where watchdog and PFI features are unnecessary. |
Compared with TPS3306-15DR, the TPS3306-15DGKR offers 33% smaller PCB area and better thermal performance in compact layouts; versus TPS3808G15DBVR, it delivers essential dual-rail coordination and system-level safety features - making it irreplaceable for DSP/microprocessor platforms requiring simultaneous 3.3 V/1.5 V supervision.
Availability
TPS3306-15DGKR is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive infotainment head units, and network edge gateways requiring stable component supply and long-term design continuity.
Supply support for TPS3306-15DGKR 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 power management technologies, serving industrial, automotive, and communications markets.
The TPS3306 family was engineered specifically for dual-supply DSP and processor systems, addressing the need for coordinated reset sequencing, independent rail monitoring, and integrated watchdog safety in resource-constrained embedded platforms.
FAQ
What is the exact SENSE1 and SENSE2 threshold voltage for TPS3306-15DGKR?
The TPS3306-15DGKR has factory-trimmed thresholds: SENSE1 trips at 2.93 V (typ), with min/max of 2.86 V/3.02 V over temperature; SENSE2 trips at 1.40 V (typ), with min/max of 1.37 V/1.43 V. These values are specified in Table 1 of the SLVS290C datasheet and apply exclusively to the -15 variant.
Can TPS3306-15DGKR monitor voltages other than 3.3 V and 1.5 V?
Yes - the PFI input accepts externally divided voltages referenced to the internal 1.25 V comparator. By selecting R1 and R2 per VPFI,trip = 1.25 V × (R1 + R2)/R2, the TPS3306-15DGKR can supervise any voltage above 1.25 V, such as battery, 5 V aux, or 2.5 V I/O rails, while SENSE1/SENSE2 remain dedicated to 3.3 V/1.5 V.
How does the watchdog timer in TPS3306-15DGKR behave during power-up?
During power-up, the TPS3306-15DGKR disables the watchdog until VDD exceeds 1.1 V and RESET deasserts. Once active, the watchdog requires a WDI transition every 0.8 s (typ); leaving WDI unconnected or floating disables the function entirely - no internal pull-up or default behavior is present.
Is TPS3306-15DGKR pin-compatible with other TPS3306 variants like TPS3306-18DGKR?
Yes - all TPS3306-x DGK variants share identical VSSOP-8 pinout, electrical interface, and timing characteristics. Only the SENSE2 threshold differs (1.40 V for -15 vs. 1.68 V for -18); SENSE1 remains fixed at 2.93 V. No PCB changes are needed when substituting within the same package.
What is the maximum sink current capability of the RESET and PFO outputs in TPS3306-15DGKR?
Both RESET and PFO are open-drain outputs rated for 5 mA maximum sink current (IOL) per Absolute Maximum Ratings table. At 2 mA load and VDD = 3.3 V, VOL is guaranteed ≤0.4 V - sufficient to drive standard logic inputs or MOSFET gates directly with appropriate pull-up.
TPS3306-15DGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.4V, 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 70ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TPS3306-15DGKR FAQ
1.How can I place an order for TPS3306-15DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-15DGKR 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 TPS3306-15DGKR reliable?
The price and inventory of TPS3306-15DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-15DGKR is usually 5 days.
3.What payment methods are accepted for TPS3306-15DGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-15DGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3306-15DGKR?
TPS3306-15DGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-15DGKR 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 TPS3306-15DGKR?
For technical support, including TPS3306-15DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-15DGKR requirements.
6.How does Aetrix verify that TPS3306-15DGKR is sourced from the original manufacturer or authorized distributors?
All TPS3306-15DGKR 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 TPS3306-15DGKR meets industry standards.
7.What is the process for return or replacement of TPS3306-15DGKR?
All TPS3306-15DGKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-15DGKR, 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 TPS3306-15DGKR part is unused and in its original packaging.
Return procedure for TPS3306-15DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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