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Texas Instruments TPS3705-30DR
- Part No.:
- TPS3705-30DR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3705-30DR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,026
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Product details
Overview
TPS3705-30DR from Texas Instruments is a precision processor supervisory IC with integrated watchdog timer, 2.63 V supply voltage monitoring threshold, 200 ms power-on reset delay, and power-fail comparator functionality. It operates over –40°C to 85°C and supports microcontroller-based systems requiring reliable power sequencing and fault detection in industrial control and portable equipment.
For engineers reviewing the TPS3705-30DR datasheet, TPS3705-30DR pinout, TPS3705-30DR application, or TPS3705-30DR equivalent, key selection criteria include its fixed 2.63 V VIT– threshold, active-low RESET output, WDI/WDO watchdog interface, PFI/PFO power-fail signaling, and compatibility with MSP430 and similar low-power MCUs.
Technical Context
The TPS3705-30DR integrates a precision bandgap reference (1.25 V), dual comparators for VDD and PFI supervision, and a monostable watchdog timer with 1.6 s timeout. Its reset logic asserts active-low RESET when VDD falls below 2.63 V or rises above it with 200 ms delay, while the watchdog requires periodic WDI transitions to prevent WDO assertion.
It implements hysteresis (50 mV on VDD, 10 mV on PFI) to reject noise-induced false triggers and uses internal resistor dividers for threshold setting-no external components required for basic operation. The device supports manual reset via MR and delivers <50 µA quiescent current across 2–6 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT– Threshold | 2.63 V (precision negative-going supply monitor; ensures stable reset release at nominal 3.0 V rail) |
| Reset Delay | 200 ms (fixed internal timing; eliminates need for external capacitor in power-on sequencing) |
| Watchdog Timeout | 1.6 s (typical; provides fail-safe recovery window for firmware hangs without external timing elements) |
| Supply Current | 50 µA max (enables long battery life in portable and low-power embedded systems) |
| Operating Temp | –40°C to 85°C (supports industrial-grade reliability without derating) |
| PFI Input Range | 0–VDD (allows flexible external voltage divider for secondary rail monitoring, e.g., 12 V via 910k/120k) |
| Output Drive | 1 mA sink (RESET), 500 µA source (WDO); sufficient for direct MCU NMI or GPIO interfacing) |
Pinout & Package
TPS3705-30DR is available in 8-pin SOIC (D package, 3.90 mm × 4.90 mm) and 8-pin MSOP-PowerPAD™ (DGN package, 3.00 mm × 3.00 mm). Both packages support standard PCB assembly and thermal dissipation up to 725 mW (SOIC) or 2.14 W (MSOP-PowerPAD).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low input; forces RESET assertion independent of VDD level-used for system-initiated resets or brownout recovery |
| 2 VDD | Supply Voltage Input | Primary power rail (2–6 V); powers internal reference, comparators, and watchdog oscillator |
| 3 GND | Ground Reference | Return path for all internal circuits and output drivers; must be low-impedance for noise immunity |
| 4 PFI | Power-Fail Input | Analog comparator input for secondary voltage monitoring (e.g., battery or auxiliary rail); threshold = 1.25 V |
| 5 PFO | Power-Fail Output | Active-low open-drain output; signals PFI threshold breach-requires external pull-up for MCU interrupt |
| 6 WDI | Watchdog Input | Edge-sensitive input; rising or falling transition resets watchdog timer-must be toggled within 1.6 s |
| 7 RESET | Reset Output | Active-low open-drain reset signal; drives MCU reset pin directly or via pull-up; 200 ms delay on power-up |
| 8 WDO | Watchdog Output | Active-low open-drain watchdog timeout signal; used for system-level fault escalation or backup reset generation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Watchdog Timer | 1.6 s timeout with edge-triggered WDI-eliminates need for external RC or dedicated watchdog IC in safety-critical firmware |
| Fixed 200 ms Power-On Reset | No external capacitor required-reduces BOM count and layout area while ensuring deterministic boot timing |
| Dual Supervision Channels | Simultaneous VDD (2.63 V) and PFI (1.25 V) monitoring enables primary rail + battery/auxiliary rail supervision in one device |
| Low Quiescent Current | 50 µA max-extends operational lifetime in battery-powered applications such as handheld instruments and remote sensors |
| Industrial Temperature Range | –40°C to 85°C operation-guarantees performance across factory floors, outdoor enclosures, and automotive under-hood environments |
Applications
| Industrial PLC Control | Portable Medical Device |
|---|---|
Use Scenario: Programmable logic controller executing real-time motion control with multiple I/O modules and fieldbus communication. IC Role / Device Role / Timing Role: Primary supervisor for 3.3 V CPU core and 5 V I/O rails; provides 200 ms power-on reset and watchdog supervision of firmware execution loop. Use Value: Prevents spurious startup due to slow-rising rails and recovers from lockups without operator intervention-meeting IEC 61131-2 reliability requirements. |
Use Scenario: Battery-powered glucose meter with LCD display, Bluetooth LE connectivity, and sensor calibration routines. IC Role / Device Role / Timing Role: Monitors main 3.0 V LDO output and battery voltage via PFI; asserts RESET on brownout and triggers low-battery alert via PFO. Use Value: Ensures safe shutdown before data corruption occurs and extends usable battery life by enabling graceful power-down at 2.7 V. |
| Automotive Body Control Module | Wireless Sensor Node |
Use Scenario: CAN-connected BCM managing door locks, lighting, and HVAC functions in 12 V vehicle electrical system. IC Role / Device Role / Timing Role: Supervises 3.3 V microcontroller supply and monitors 12 V battery via resistive divider on PFI; generates reset and power-fail interrupt. Use Value: Maintains functional safety during cold cranking (transient 6 V dips) and detects battery discharge before deep discharge damage. |
Use Scenario: LoRaWAN-enabled environmental sensor node deployed in unattended outdoor locations for years. IC Role / Device Role / Timing Role: Provides ultra-low-power supervision of 3.0 V coin-cell supply; watchdog guards against firmware stalls during sleep/wake cycles. Use Value: Achieves >5-year battery life while guaranteeing autonomous recovery from software faults-critical for remote maintenance avoidance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar processor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706R | 2.63 V threshold, no watchdog timer, 200 ms reset delay, SOIC-8 only | Lacks WDI/WDO interface; suitable only where watchdog is implemented in firmware or external circuit | Select when cost sensitivity outweighs need for hardware watchdog and MSOP packaging is not required |
| TPS3808G33 | 2.93 V threshold, adjustable reset delay (1–10 s), 2.5 µA IQ, no PFI/PFO | Higher threshold and programmable delay suit 3.3 V systems needing longer initialization; lacks power-fail monitoring | Choose for ultra-low-power designs with precise delay tuning but no secondary rail monitoring requirement |
Compared with MAX706R and TPS3808G33, the TPS3705-30DR uniquely combines fixed 2.63 V supervision, integrated watchdog, and dual-rail monitoring in a single 8-pin package-making it optimal for space-constrained, safety-aware embedded systems requiring both reset and power-fail signaling.
Availability
TPS3705-30DR is available at Aetrix Electronics and suitable for industrial control, portable medical instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TPS3705-30DR 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, with decades of experience in high-reliability industrial and automotive IC design.
The TPS370x family was engineered specifically for robust microprocessor supervision in harsh environments-delivering precision voltage monitoring, deterministic reset timing, and integrated watchdog functionality without external components.
FAQ
What is the exact supply voltage threshold monitored by the TPS3705-30DR?
The TPS3705-30DR monitors VDD with a precise negative-going threshold (VIT–) of 2.63 V, with ±70 mV hysteresis. This value is factory-trimmed and guaranteed over –40°C to 85°C. It is designed for use with nominal 3.0 V systems, ensuring reset assertion before critical logic levels degrade.
Does the TPS3705-30DR require an external capacitor for reset timing?
No, the TPS3705-30DR features an internal 200 ms power-on reset timer-no external capacitor is needed. This simplifies layout, reduces BOM count, and improves timing consistency across temperature and voltage variations compared to RC-based solutions.
How does the watchdog function operate on the TPS3705-30DR?
The TPS3705-30DR watchdog requires a rising or falling edge on WDI at least once every 1.6 s (typical). If missed, WDO goes active-low. Leaving WDI unconnected disables the watchdog. The timer is independent of VDD monitoring and resets on each valid WDI transition.
Can the TPS3705-30DR monitor a 12 V supply rail?
Yes-the PFI input accepts voltages up to VDD + 0.3 V and is referenced to an internal 1.25 V comparator. Using a resistor divider (e.g., 910 kΩ/120 kΩ), the TPS3705-30DR can accurately detect 12 V drops below ~10.7 V, generating a PFO interrupt for power-fail warning.
What package options are available for the TPS3705-30DR?
The TPS3705-30DR is offered in two industry-standard packages: 8-pin SOIC (D, 3.90 mm × 4.90 mm) and 8-pin MSOP-PowerPAD™ (DGN, 3.00 mm × 3.00 mm). Both are RoHS-compliant, lead-free, and supported by full thermal and reliability characterization data.
TPS3705-30DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS3705-30DR FAQ
1.How can I place an order for TPS3705-30DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3705-30DR 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 TPS3705-30DR reliable?
The price and inventory of TPS3705-30DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3705-30DR is usually 5 days.
3.What payment methods are accepted for TPS3705-30DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3705-30DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3705-30DR?
TPS3705-30DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3705-30DR 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 TPS3705-30DR?
For technical support, including TPS3705-30DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3705-30DR requirements.
6.How does Aetrix verify that TPS3705-30DR is sourced from the original manufacturer or authorized distributors?
All TPS3705-30DR 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 TPS3705-30DR meets industry standards.
7.What is the process for return or replacement of TPS3705-30DR?
All TPS3705-30DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3705-30DR, 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 TPS3705-30DR part is unused and in its original packaging.
Return procedure for TPS3705-30DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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