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Texas Instruments TL7705BCDR
- Part No.:
- TL7705BCDR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7705BCDR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
TL7705BCDR from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for 5-V microprocessor systems. It monitors the SENSE input for undervoltage conditions, provides true and complement active-high/active-low RESET outputs, features an externally adjustable reset pulse duration via CT capacitor, and maintains defined RESET behavior down to VCC ≥ 1 V. Its 4.55 V nominal threshold and ±30 mV hysteresis ensure reliable power-on and brownout detection in industrial control units.
For engineers reviewing the TL7705BCDR datasheet, TL7705BCDR pinout, TL7705BCDR application, or TL7705BCDR equivalent, this page delivers verified electrical characteristics (VIT– = 4.55 V typ, VREF = 2.53 V, ICC = 3 mA max), thermal metrics (RθJA = 109.2°C/W), timing behavior (tPLH/tPHL ≤ 500 ns), and functional mode details - all specific to the SOIC-8, commercial-grade (0°C to 70°C) variant.
Technical Context
The TL7705BCDR implements a dual-comparator architecture with temperature-compensated bandgap reference and precision voltage sensing at the SENSE pin. Its internal timing circuit uses a current source charging an external CT capacitor to generate user-defined reset pulse widths (td ≈ 2.6×10⁴ × CT).
It supports three functional modes: automatic reset on SENSE undervoltage, manual reset override via RESIN, and simultaneous assertion of complementary RESET/RESET outputs. The REF output provides a stable 2.53 V reference for external circuitry, while both open-collector outputs require external pullup/pulldown resistors per layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT– Threshold | 4.55 V nominal; ensures reliable reset activation when monitored 5-V rail drops below safe operating level |
| VHYS Hysteresis | 30 mV; prevents chatter during slow-rising/falling supply transitions |
| VREF Output | 2.53 V ±0.05 V; stable reference for ADC biasing or comparator use |
| ICC Supply Current | 3 mA max at VCC = 18 V; enables low-power system monitoring without burdening supply |
| RθJA Thermal Resistance | 109.2°C/W (SOIC-8); defines maximum power dissipation limit under still-air conditions |
| Reset Pulse Width | Adjustable via CT capacitor (e.g., 0.1 µF → ~2.6 ms); guarantees full microcontroller initialization time |
| Operating Temperature | 0°C to 70°C; qualified for commercial-grade embedded applications |
Pinout & Package
TL7705BCDR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and RoHS-compliant NiPdAu lead finish (Level-2-260°C-1 year MSL rating).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference voltage output | Provides 2.53 V ±0.05 V reference; requires 0.1 µF bypass capacitor to GND for noise immunity |
| 2 (RESIN) | Manual reset input | Active-low override: pulls RESET high and RESET low when asserted; VIH ≥ 2 V, VIL ≤ 0.8 V |
| 3 (CT) | Timing capacitor connection | Controls reset pulse duration (td ≈ 2.6×10⁴ × CT); internal current source charges CT to ~1.8 V |
| 4 (GND) | Ground reference | System return path; must be low-impedance and shared with REF/SENSE decoupling capacitors |
| 5 (RESET) | Active-low reset output | Open-collector output; requires external pullup resistor (TI recommends 10 kΩ) to interface with MCU reset pin |
| 6 (RESET) | Active-high reset output | Open-collector output; requires external pulldown resistor (TI recommends 10 kΩ) to avoid undefined state |
| 7 (SENSE) | Supply voltage monitoring input | Monitors external rail (e.g., 5-V VCC); triggers reset when voltage falls below 4.55 V threshold |
| 8 (VCC) | Power supply input | Operates from 3.6 V to 18 V; RESET remains defined down to VCC ≥ 1 V for early-fail detection |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable reset pulse duration | Enables precise tailoring of reset hold time (e.g., 0.1 µF → 2.6 ms) to match target MCU's minimum reset requirement |
| True and complement reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Precision voltage sensor with temp compensation | Maintains ±30 mV threshold accuracy over 0°C–70°C, ensuring consistent reset behavior across ambient temperature swings |
| RESET output defined from VCC ≥ 1 V | Guarantees valid reset assertion even during severe brownout or partial power loss, improving system fault resilience |
| Reference voltage output (REF) | Delivers stable 2.53 V reference for external analog functions (e.g., ADC reference, comparator thresholds), reducing BOM count |
Applications
| Industrial PLC Controller | 5-V Microcontroller Power Management |
|---|---|
Use Scenario: Monitors 5-V supply rail in programmable logic controller CPU module during factory automation operation. IC Role / Device Role / Timing Role: Voltage supervisor and reset generator; asserts RESET/RESET when SENSE drops below 4.55 V due to line sag or load surge. Use Value: Prevents erratic program execution by enforcing clean reset before firmware restart, leveraging 30 mV hysteresis to reject transient dips. |
Use Scenario: Integrated into notebook motherboard design to supervise core 5-V rail powering ARM-based SoC and peripherals. IC Role / Device Role / Timing Role: Dual-output reset controller; drives SoC reset pin directly via RESET (active-low) and provides status signal via RESET (active-high). Use Value: Eliminates discrete inverter requirement while ensuring 2.6 ms minimum reset pulse (via 0.1 µF CT) meets SoC datasheet specification. |
| Network Equipment Power Sequencing | Building Automation Gateway |
Use Scenario: Used in Ethernet switch power management to coordinate reset of PHY and MAC controllers after 5-V rail stabilization. IC Role / Device Role / Timing Role: Supervisor with manual override; RESIN allows software-triggered reset via GPIO, while SENSE monitors rail integrity. Use Value: Enables both autonomous brownout recovery and controlled system reboot without requiring additional logic or firmware intervention. |
Use Scenario: Embedded in HVAC gateway unit to supervise 5-V supply feeding Zigbee/Wi-Fi radio and sensor interface MCU. IC Role / Device Role / Timing Role: Precision voltage monitor; REF output supplies 2.53 V reference to analog front-end ADC measuring temperature/humidity. Use Value: Reduces component count by integrating reference and reset functions, while maintaining ±0.05 V REF accuracy over commercial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3-V threshold, no REF output, lower ICC (1.5 µA), SOT-23-6 package | Suitable only for 3.3-V systems; lacks dual reset outputs and reference voltage capability | Select when ultra-low quiescent current and small footprint are prioritized over 5-V supervision and REF functionality |
| MAX6326UT46D3+T | 4.63-V threshold, ±1.5% accuracy, no REF output, 5-pin SOT-23 package | Higher threshold tolerance (±1.5% vs ±0.66%), no timing capacitor adjustment, no reference output | Choose for tighter threshold accuracy in space-constrained designs where adjustable pulse width and REF are unnecessary |
Compared with TL7705BCDR, TPS3808G33DBVR offers significantly lower power but cannot supervise 5-V rails or provide reference voltage; MAX6326UT46D3+T delivers higher threshold precision in a smaller package but sacrifices pulse adjustability and dual-output flexibility.
Availability
TL7705BCDR is available at Aetrix Electronics and suitable for industrial PLC controllers, 5-V microcontroller power management, network equipment power sequencing, and building automation gateways requiring stable component supply with guaranteed long-term availability.
Supply support for TL7705BCDR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TL77xxB family was developed specifically for robust, precision supply-voltage monitoring in microprocessor-based systems, emphasizing threshold stability, dual-reset flexibility, and wide operating voltage range (3.6 V–18 V).
FAQ
What is the exact undervoltage threshold voltage for TL7705BCDR?
The TL7705BCDR has a nominal negative-going input threshold voltage (VIT–) of 4.55 V at 25°C, with a guaranteed range of 4.45 V to 4.65 V across its full operating temperature range (0°C to 70°C). This threshold is laser-trimmed and temperature-compensated to maintain stability in commercial-grade applications.
How does the CT pin function in TL7705BCDR, and what capacitor value sets a 2.6-ms reset pulse?
The CT pin in TL7705BCDR connects to an external timing capacitor that controls reset pulse duration via td ≈ 2.6×10⁴ × CT (seconds). A 0.1 µF capacitor yields approximately 2.6 ms, matching typical microcontroller reset requirements. TI recommends a 0.1 µF ceramic capacitor with X7R dielectric for stability and low ESR.
Does TL7705BCDR provide both active-high and active-low reset outputs simultaneously?
Yes, TL7705BCDR provides true and complement reset outputs: RESET (pin 6, active-high open-collector) and RESET (pin 5, active-low open-collector). Both outputs assert/deassert simultaneously during power-up, brownout, or RESIN-triggered events, enabling direct interface with mixed-logic systems without external inversion.
What is the purpose of the REF pin on TL7705BCDR, and what load can it drive?
The REF pin (pin 1) delivers a precision 2.53 V ±0.05 V reference voltage derived from an internal bandgap. It is specified for Iref = –500 µA (sinking), making it suitable for biasing ADC references or comparator thresholds. TI recommends a 0.1 µF bypass capacitor to ground to suppress noise and prevent false triggering.
Can TL7705BCDR operate reliably with a 3.6-V supply, and what is its minimum functional VCC?
Yes, TL7705BCDR operates reliably within the recommended range of 3.6 V to 18 V. Critically, its RESET outputs remain fully defined down to VCC ≥ 1 V - meaning it continues to assert valid reset signals even during deep brownout conditions well below its minimum operating voltage, enhancing system fault coverage.
TL7705BCDR 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:
- 4.55V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 270ns Typical Propagation Delay
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7705BCDR FAQ
1.How can I place an order for TL7705BCDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7705BCDR 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 TL7705BCDR reliable?
The price and inventory of TL7705BCDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7705BCDR is usually 5 days.
3.What payment methods are accepted for TL7705BCDR?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7705BCDR?
TL7705BCDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7705BCDR 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 TL7705BCDR?
For technical support, including TL7705BCDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7705BCDR requirements.
6.How does Aetrix verify that TL7705BCDR is sourced from the original manufacturer or authorized distributors?
All TL7705BCDR 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 TL7705BCDR meets industry standards.
7.What is the process for return or replacement of TL7705BCDR?
All TL7705BCDR units undergo pre-shipment inspection (PSI). If there is an issue with TL7705BCDR, 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 TL7705BCDR part is unused and in its original packaging.
Return procedure for TL7705BCDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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