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Texas Instruments TPS3306-15DGKRG4
- Part No.:
- TPS3306-15DGKRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS3306-15DGKRG4.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3306-15DGKRG4 from Texas Instruments is a dual-voltage supervisory IC designed for DSP and processor-based systems requiring independent monitoring of 3.3 V and 1.5 V rails. It integrates power-on reset (100 ms delay), watchdog timer (0.8 s timeout), open-drain RESET and PFO outputs, and a dedicated power-fail comparator. Used in TMS320VC5441-based embedded control systems with AVDD/CVDD/DVDD sequencing.
For engineers reviewing the TPS3306-15DGKRG4 datasheet, TPS3306-15DGKRG4 pinout, TPS3306-15DGKRG4 application, or TPS3306-15DGKRG4 equivalent, key selection criteria include dual-threshold voltage supervision (2.93 V / 1.40 V), ultra-low 15 µA supply current, MSOP-8 package compatibility, and guaranteed RESET assertion down to VDD ≥ 1.1 V - critical for low-power boot integrity and brownout recovery.
Technical Context
The TPS3306-15DGKRG4 implements two independent voltage comparators with fixed thresholds (2.93 V on SENSE1, 1.40 V on SENSE2) referenced to an internal 1.25 V bandgap, each with ~20 mV hysteresis. Its RESET logic combines power-up initialization, sustained low-voltage detection, and watchdog-triggered assertion - all driving a single open-drain output with 0.4 V max VOL at 2 mA.
The integrated watchdog accepts edge-triggered WDI inputs (rising or falling), resets its 0.8 s timer on transition, and asserts RESET if untriggered; leaving WDI floating disables it. The PFI/PFO path provides a separate 1.25 V reference comparator for external voltage monitoring, supporting configurable trip points via resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised Voltages | 3.3 V (SENSE1) and 1.5 V (SENSE2) nominal rails - enables simultaneous monitoring of core I/O and analog/low-voltage domains in DSPs like TMS320VC5441. |
| Threshold Voltages (TYP) | SENSE1 = 2.93 V, SENSE2 = 1.40 V - ensures reliable detection of 3.3 V rail drop below 2.93 V and 1.5 V rail drop below 1.40 V with 20 mV hysteresis. |
| RESET Delay Time | 100 ms typ - guarantees sufficient hold time for microprocessor initialization after both supplies stabilize above threshold. |
| Watchdog Timeout | 0.8 s - provides robust program execution monitoring without excessive sensitivity to transient delays in real-time firmware loops. |
| Supply Current | 15 µA typ at VDD = 3.3 V - minimizes quiescent load on battery-backed or energy-constrained systems. |
| VDD Operating Range | 2.7 V to 6 V - supports operation across wide input conditions while maintaining valid RESET behavior down to VDD ≥ 1.1 V. |
| Output Type | Open-drain RESET and PFO - allows wired-OR configuration, level translation, and flexible pull-up placement per system voltage domain. |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, 1.1 mm max height, exposed pad not electrically connected. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SENSE1 | Voltage sense input 1 | Monitors 3.3 V rail; asserts RESET when voltage falls below 2.93 V (typ) with 20 mV hysteresis. |
| 2 - SENSE2 | Voltage sense input 2 | Monitors 1.5 V rail; asserts RESET when voltage falls below 1.40 V (typ) with 20 mV hysteresis. |
| 3 - PFI | Power-fail comparator input | Accepts external voltage divider for monitoring auxiliary supplies (e.g., battery, backup rail); referenced to 1.25 V internal reference. |
| 4 - GND | Analog/digital ground | Common return for all internal comparators, reference, and outputs; requires low-impedance connection to system ground plane. |
| 5 - RESET | Active-low open-drain reset output | Drives low during power-up, brownout, or watchdog timeout; requires external pull-up to appropriate logic rail (e.g., 3.3 V). |
| 6 - PFO | Active-low open-drain power-fail output | Independent of RESET; signals PFI input drop below 1.25 V threshold - used for low-battery warning or secondary supply monitoring. |
| 7 - WDI | Watchdog timer input | Edge-sensitive (rising/falling); must be toggled within 0.8 s to prevent RESET assertion; floating disables watchdog. |
| 8 - VDD | Supply voltage input | Primary power source (2.7–6 V); powers internal circuitry and defines logic thresholds; RESET active when VDD ≥ 1.1 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous 3.3 V/1.5 V monitoring with fixed, factory-trimmed thresholds eliminates need for external resistive dividers on primary rails. |
| Integrated 100 ms power-on reset timer | Guarantees minimum reset pulse width after both SENSE inputs exceed threshold - prevents premature release during supply ramp-up. |
| Configurable power-fail detection (PFI/PFO) | Enables monitoring of third voltage (e.g., battery, 5 V auxiliary) using external resistor network - adds fail-safe capability without extra ICs. |
| Edge-triggered watchdog with 0.8 s timeout | Reduces firmware overhead vs. level-sensitive designs; tolerates brief instruction stalls while catching infinite loops or lockups. |
| Ultra-low 15 µA supply current | Extends battery life in portable equipment and reduces thermal load in dense PCB layouts - critical for always-on supervisory functions. |
Applications
| DSP Power Sequencing | Low-Power Embedded Control |
|---|---|
Use Scenario: TMS320VC5441-based audio processing board with separate AVDD (3.3 V), CVDD (3.3 V), and DVDD (1.5 V) supplies requiring synchronized reset release. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring DVDD stabilizes before releasing RESET, preventing core logic corruption during mixed-rail startup. Use Value: Eliminates discrete RC reset circuits and manual timing calculations - guarantees 100 ms minimum RESET hold time after both rails exceed thresholds. |
Use Scenario: Battery-powered industrial sensor node with 3.3 V MCU and 1.5 V analog front-end, operating in intermittent wake/sleep cycles. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor providing brownout protection and watchdog supervision during active mode, with minimal drain in sleep. Use Value: 15 µA IDD extends battery runtime; open-drain outputs allow direct interface to multiple voltage domains without level shifters. |
| Automotive Body Control Module | Portable Medical Instrument |
Use Scenario: CAN-connected BCM with 5 V main supply, 3.3 V microcontroller rail, and 1.5 V sensor interface - requiring fail-safe reset under load-dump or cold-crank conditions. IC Role / Device Role / Timing Role: Monitors 3.3 V and 1.5 V rails while using PFI to detect battery voltage sag below 10 V via resistor divider. Use Value: PFO output triggers graceful shutdown before MCU brownout; RESET remains asserted until both rails recover - prevents erratic CAN messaging. |
Use Scenario: Handheld ECG device powered by coin cell, featuring 3.3 V ADC and 1.5 V op-amp signal chain with strict safety-critical reset requirements. IC Role / Device Role / Timing Role: Ensures reliable power-on initialization and continuous program execution monitoring via WDI, with RESET assertion guaranteed down to VDD = 1.1 V. Use Value: Prevents false starts or silent failures during low-battery operation; watchdog timeout (0.8 s) aligns with clinical response timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3306-15DR | Same electrical specs and pinout; 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 (271 mW vs. 220 mW at +85°C). | Suitable for through-hole prototyping or legacy SOIC layouts; less optimal for space-constrained portable designs. | Select TPS3306-15DR only when board layout or assembly process mandates SOIC-8; otherwise prefer DGK for miniaturization. |
| TPS3823-15DBVR | Single-supply supervisor (1.5 V only), SOT-23-5 package, no watchdog or PFI/PFO. Lower IDD (12 µA), but lacks dual-rail monitoring and failsafe features. | Applicable only where only 1.5 V rail supervision is required; cannot replace TPS3306-15DGKRG4 in 3.3 V/1.5 V systems. | Use TPS3823-15DBVR only as cost-optimized alternative in single-rail applications - not a functional substitute for dual-supply supervision. |
Compared with TPS3306-15DR, the TPS3306-15DGKRG4 offers 33% smaller PCB area and better thermal performance in high-density layouts; compared with TPS3823-15DBVR, it delivers essential dual-rail coordination, watchdog, and PFI functionality required for robust DSP and processor reset management.
Availability
TPS3306-15DGKRG4 is available at Aetrix Electronics and suitable for DSP power sequencing, battery-powered embedded control, automotive body electronics, portable medical instrumentation, and industrial sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for TPS3306-15DGKRG4 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 decades of expertise in power management and system supervision ICs.
The TPS3306 family is designed specifically for dual-rail voltage monitoring in DSP and microprocessor systems - addressing the need for coordinated reset timing, watchdog safety, and auxiliary power-fail detection in resource-constrained embedded platforms.
FAQ
What is the exact reset threshold voltage for SENSE2 on the TPS3306-15DGKRG4?
The TPS3306-15DGKRG4 has a factory-trimmed SENSE2 threshold voltage of 1.40 V (typical), with a guaranteed range of 1.37 V to 1.43 V over temperature (–40°C to +85°C). This threshold is optimized for monitoring 1.5 V nominal supplies and includes ~20 mV hysteresis to prevent chatter near the trip point. The value is fixed and does not require external resistor calibration.
Does the TPS3306-15DGKRG4 require external components to supervise 3.3 V and 1.5 V rails?
No - the TPS3306-15DGKRG4 internally monitors 3.3 V and 1.5 V rails using factory-trimmed thresholds (2.93 V and 1.40 V respectively), so no external resistor dividers are needed for those primary supplies. External resistors are only required if using the PFI input to monitor a third voltage, such as a battery or auxiliary rail.
Can the watchdog timer on the TPS3306-15DGKRG4 be disabled, and how?
Yes, the watchdog timer on the TPS3306-15DGKRG4 is disabled by leaving the WDI pin unconnected (floating) or tying it to a high-impedance state. No configuration register or external signal is required - the device detects the absence of toggling edges and halts watchdog operation. This simplifies integration when firmware-level supervision is not needed.
What is the minimum VDD voltage at which the TPS3306-15DGKRG4 guarantees RESET assertion?
The TPS3306-15DGKRG4 guarantees active RESET output when VDD rises to ≥1.1 V, regardless of SENSE1/SENSE2 states. This ensures early fault detection during power-up and brownout events - a critical feature for systems where logic may become unstable below 1.5 V. The specification is tested and guaranteed across the full temperature range.
Is the TPS3306-15DGKRG4 pin-compatible with other members of the TPS3306 family?
Yes - all TPS3306-x variants (e.g., TPS3306-18DGKRG4, TPS3306-25DGKRG4) share identical pinout, package, and electrical interface. Only the SENSE1/SENSE2 threshold voltages differ (e.g., 2.93 V / 1.68 V for -18 variant). This allows direct substitution in existing layouts when adjusting for different supply rail combinations, provided the new thresholds match system requirements.
TPS3306-15DGKRG4 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:
- Obsolete
- 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
TPS3306-15DGKRG4 FAQ
1.How can I place an order for TPS3306-15DGKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3306-15DGKRG4 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 TPS3306-15DGKRG4 reliable?
The price and inventory of TPS3306-15DGKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3306-15DGKRG4 is usually 5 days.
3.What payment methods are accepted for TPS3306-15DGKRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3306-15DGKRG4 transactions.
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TPS3306-15DGKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3306-15DGKRG4 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 TPS3306-15DGKRG4?
For technical support, including TPS3306-15DGKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3306-15DGKRG4 requirements.
6.How does Aetrix verify that TPS3306-15DGKRG4 is sourced from the original manufacturer or authorized distributors?
All TPS3306-15DGKRG4 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 TPS3306-15DGKRG4 meets industry standards.
7.What is the process for return or replacement of TPS3306-15DGKRG4?
All TPS3306-15DGKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3306-15DGKRG4, 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 TPS3306-15DGKRG4 part is unused and in its original packaging.
Return procedure for TPS3306-15DGKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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