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Texas Instruments UCC2946PWTRG4
- Part No.:
- UCC2946PWTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC2946PWTRG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,489
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Product details
Overview
UCC2946PWTRG4 from Texas Instruments is a microprocessor supervisor IC with integrated watchdog timer, programmable reset threshold (1.235 V ±2%), programmable reset period (140–320 ms), and programmable watchdog period (0.96–2.56 s). It operates from 2.1 V to 5.5 V, draws ≤18 µA supply current, and asserts valid reset down to VDD = 1 V - used in industrial embedded systems requiring robust power-on and fault recovery.
For engineers reviewing the UCC2946PWTRG4 datasheet, UCC2946PWTRG4 pinout, UCC2946PWTRG4 application, or UCC2946PWTRG4 equivalent, key selection criteria include its −40°C to +95°C operating temperature range, TSSOP-8 package, independent RES/WDO outputs, and precision 400 nA timing current sources for external capacitor-based programming of reset and watchdog intervals.
Technical Context
The UCC2946PWTRG4 implements dual independent timing paths: one for power-on reset (POR) using RP pin and 400 nA current source charging CRP, and another for watchdog timeout using WP pin and identical 400 nA source charging CWP. Both thresholds reference an internal 1.235 V bandgap with 15 mV hysteresis.
Its RES output remains asserted low until VDD exceeds the programmed RTH voltage and sustains it for the full reset period; WDO asserts low only if WDI fails to toggle within the programmed watchdog window. Watchdog function is automatically disabled during active reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 2.1 V to 5.5 V - supports 3.3 V and 5 V logic rails with margin for brownout tolerance |
| Reset Threshold Accuracy | 1.235 V ±2% - enables precise undervoltage detection for reliable microprocessor initialization |
| Supply Current (IDD) | ≤18 µA max - ensures minimal impact on battery-backed or low-power systems |
| Valid Reset at Low VDD | RES functional down to VDD = 1 V - guarantees reset assertion during deep brownout |
| Reset Period Range | 140 ms to 320 ms (with CRP = 64 nF) - configurable via external capacitor for system boot timing alignment |
| Watchdog Period Range | 0.96 s to 2.56 s (with CWP = 64 nF) - user-adjustable timeout for firmware activity monitoring |
| Temperature Range | −40°C to +95°C - qualified for industrial-grade operation without derating |
Pinout & Package
UCC2946PWTRG4 is housed in an 8-pin TSSOP (PW) package, 3.0 mm × 4.4 mm, 0.65 mm pitch, thermally enhanced for surface-mount assembly on dense PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal analog and digital circuitry; must be low-impedance connection to system ground plane |
| RTH (Pin 2) | Reset threshold input | Voltage divider node compared to 1.235 V internal reference; sets custom reset trip point |
| RES (Pin 3) | Active-low reset output | Open-drain output asserting low during power-up, brownout, or manual reset; requires external pull-up |
| RP (Pin 4) | Reset period timing | 400 nA current source charges external CRP capacitor to define reset pulse duration |
| WDI (Pin 5) | Watchdog input | Edge-sensitive input toggled by host MCU to prevent watchdog timeout; accepts CMOS-level transitions |
| WP (Pin 6) | Watchdog period timing | 400 nA current source charges external CWP capacitor to define watchdog timeout interval |
| VDD (Pin 8) | Power supply | Single-supply input powering all internal blocks; decoupling with 0.1 µF capacitor required |
| WDO (Pin 7) | Active-low watchdog output | Open-drain output asserting low on watchdog timeout; may be wired-OR'd with RES or fed to NMI |
Key Features
| Feature | Design Value |
|---|---|
| Fully programmable reset threshold | Set via external R1/R2 divider on RTH pin - supports monitoring of any rail ≥1.235 V, not just VDD |
| Independent reset and watchdog outputs | Separate RES and WDO pins allow flexible reset architecture - e.g., WDO → NMI, RES → hard reset |
| Glitch-immune reset detection | Rejects transients <100 mV/120 µs per Figure 1 - prevents spurious resets from supply noise |
| Low-quiescent-current timing | 400 nA precision current sources for RP and WP - enable long timeouts with nanoampere power budget |
| Extended low-VDD operation | Valid RES assertion down to VDD = 1 V - ensures reset integrity during severe brownout or backup battery switchover |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Power cycling and firmware crashes in remote metering units deployed in unregulated AC environments. IC Role / Device Role / Timing Role: UCC2946PWTRG4 monitors main 3.3 V rail and provides POR reset plus periodic watchdog supervision of metrology firmware. Use Value: Prevents lockup during voltage sags; 95°C rating ensures reliability inside sealed outdoor enclosures. |
Use Scenario: Long-term field deployment where firmware must recover autonomously from memory corruption or sensor hang. IC Role / Device Role / Timing Role: UCC2946PWTRG4 acts as fail-safe supervisor - RES initiates cold boot on power-up, WDO triggers NMI-based recovery on missed WDI toggle. Use Value: Eliminates need for manual reset; programmable watchdog period aligns with 2-second metrology sampling interval. |
| Factory Automation HMI | Railway Signaling Interface |
Use Scenario: Human-machine interface panels exposed to EMI-rich factory floors with frequent power interruptions. IC Role / Device Role / Timing Role: UCC2946PWTRG4 supervises ARM Cortex-M4 application processor, asserting RES on brownout and WDO on GUI task stall. Use Value: 2% reset threshold accuracy avoids false triggers; TSSOP-8 footprint saves space on compact display controller PCBs. |
Use Scenario: Safety-critical signaling modules requiring deterministic reset behavior under wide ambient temperature swings (−40°C to +70°C). IC Role / Device Role / Timing Role: UCC2946PWTRG4 provides dual-redundant supervision - RES ensures clean boot, WDO validates real-time communication stack liveness. Use Value: −40°C to +95°C rating exceeds EN 50121-3-2 requirements; independent outputs support SIL-2-compliant voting logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V reset threshold; no watchdog timer; 1.6 µA typical IDD | Lacks programmable watchdog - suitable only for basic POR, not fault recovery | Select when only power-on reset is needed and ultra-low current is critical |
| MAX6816EUT+T | Fixed 3.0 V threshold; includes debounced pushbutton input; no programmable watchdog period | Designed for manual reset integration, not autonomous firmware supervision | Select when board-level reset button debounce is required alongside fixed-threshold POR |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the UCC2946PWTRG4 uniquely combines fully programmable reset threshold, reset period, and watchdog period in a single industrial-temperature TSSOP-8 package - enabling tailored supervision for diverse MCU boot and runtime safety requirements without external logic.
Availability
UCC2946PWTRG4 is available at Aetrix Electronics and suitable for industrial automation, smart metering, and railway signaling applications requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across temperature extremes.
Supply support for UCC2946PWTRG4 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 for industrial, automotive, and communications markets.
The UCC2946PWTRG4 belongs to TI's microprocessor supervisor product line, engineered specifically for robust, programmable power monitoring and fault recovery in harsh-environment embedded systems.
FAQ
What is the operating temperature range of the UCC2946PWTRG4?
The UCC2946PWTRG4 is rated for operation from −40°C to +95°C, making it suitable for industrial environments where ambient temperatures exceed commercial-grade limits. This range is confirmed in the SLUS247B datasheet's Electrical Characteristics table under "UCC2946" column and Absolute Maximum Ratings section. The device maintains full specification compliance across this range without derating.
Can the UCC2946PWTRG4 monitor a voltage other than VDD?
Yes - the UCC2946PWTRG4 uses the RTH pin to sense an externally divided voltage, allowing it to monitor any rail ≥1.235 V, such as 1.8 V, 2.5 V, or 3.3 V supplies. The reset threshold is set by VRESET = 1.235 V × (R1 + R2)/R2, as defined in the Application Information section of SLUS247B. This flexibility is intrinsic to the UCC2946PWTRG4's architecture.
How does the UCC2946PWTRG4 handle supply voltage glitches?
The UCC2946PWTRG4 rejects short-duration, low-amplitude VDD glitches using built-in filtering: transients below 100 mV overdrive or shorter than 120 µs (per Figure 1 in SLUS247B) do not trigger RES. This immunity is achieved via internal edge-detect circuitry and timing hysteresis, ensuring the UCC2946PWTRG4 only asserts reset during genuine brownout conditions.
What is the function of the WP and RP pins on the UCC2946PWTRG4?
The WP (Pin 6) and RP (Pin 4) pins each source a precision 400 nA current to charge external capacitors CWP and CRP, respectively. Charging time defines the watchdog period (TWP = 25 × CWP) and reset period (TRP = 3.125 × CRP), both in milliseconds and nanofarads. This capacitor-based timing gives the UCC2946PWTRG4 full programmability without trimming resistors or internal RC networks.
Is the UCC2946PWTRG4 pin-compatible with UCC3946 or UCC1946?
No - while UCC2946PWTRG4 shares identical pinout and functionality with UCC3946 and UCC1946 in SOIC-8, TSSOP-8, and DIP-8 packages, its temperature rating (−40°C to +95°C) differs from UCC3946 (0°C to +70°C) and UCC1946 (−55°C to +125°C). The UCC2946PWTRG4 is not a drop-in replacement where extended temperature compliance is required, though PCB layout remains identical for TSSOP-8 variants.
UCC2946PWTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- 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-TSSOP
UCC2946PWTRG4 FAQ
1.How can I place an order for UCC2946PWTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2946PWTRG4 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 UCC2946PWTRG4 reliable?
The price and inventory of UCC2946PWTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2946PWTRG4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2946PWTRG4 transactions.
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4.How is shipping managed for UCC2946PWTRG4?
UCC2946PWTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2946PWTRG4 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 UCC2946PWTRG4?
For technical support, including UCC2946PWTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2946PWTRG4 requirements.
6.How does Aetrix verify that UCC2946PWTRG4 is sourced from the original manufacturer or authorized distributors?
All UCC2946PWTRG4 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 UCC2946PWTRG4 meets industry standards.
7.What is the process for return or replacement of UCC2946PWTRG4?
All UCC2946PWTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC2946PWTRG4, 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 UCC2946PWTRG4 part is unused and in its original packaging.
Return procedure for UCC2946PWTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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