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Texas Instruments TLC7705IPW
- Part No.:
- TLC7705IPW
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC7705IPW.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:671
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Product details
Overview
TLC7705IPW from Texas Instruments is a micropower supply voltage supervisor IC with fixed 4.55 V negative-going threshold, programmable reset delay via external capacitor, and totem-pole RESET/RESET outputs. It operates from 2 V to 6 V supply, draws ≤16 µA quiescent current, and supports power-down control for battery-backed static RAM in microcomputer systems.
For engineers reviewing the TLC7705IPW datasheet, TLC7705IPW pinout, TLC7705IPW application, or TLC7705IPW equivalent, this page delivers verified specifications, TSSOP-8 package details, medical imaging and industrial embedded use cases, and two validated alternative supervisors with documented threshold and timing differences.
Technical Context
The TLC7705IPW implements a precision voltage sensor with temperature-compensated reference and hysteresis (70 mV) to prevent chatter during threshold crossing. Its internal timer generates a user-defined delay (td = 2.1×10⁴ × CT seconds) after SENSE voltage recovers above 4.55 V before deasserting RESET.
It features dual active-high and active-low reset outputs, CONTROL input for RAM power-down mode selection, RESIN for manual reset override, and defined RESET assertion down to VDD ≥ 1 V-enabling reliable power-on reset even during brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 4.55 V (fixed negative-going SENSE threshold; ensures reset activation when supply drops below nominal 5 V rail) |
| Supply Range | 2 V to 6 V (supports single-cell Li-ion, 3.3 V, and 5 V systems without external regulation) |
| Quiescent Current | ≤16 µA at 5 V (enables multi-year battery life in always-on monitoring applications) |
| Reset Delay | Programmable via external CT (td = 2.1×10⁴ × CT; e.g., 100 nF yields ~2.1 ms delay) |
| Output Type | Totem-pole RESET and open-drain RESET (supports direct MCU reset pin drive and external pull-up flexibility) |
| Operating Temp | –40°C to 85°C (qualified for commercial/industrial environments; PW package rated per TI spec) |
| Hysteresis | 70 mV (prevents oscillation near threshold during slow supply ramp or noise) |
Pinout & Package
TLC7705IPW uses an 8-pin TSSOP (PW) package, 3.0 mm × 4.4 mm, 0.65 mm pitch, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Connects to monitored 2–6 V rail; RESET asserts when VDD ≥ 1 V during power-up |
| GND | Ground reference | Common return for all internal circuitry and output drivers |
| SENSE | Voltage monitor input | Monitors external rail; RESET activates when SENSE falls below 4.55 V |
| CONTROL | RAM power-down mode select | Low = active-high RESET; enables automatic CS disable of battery-backed SRAM during power loss |
| RESIN | Manual reset input | Active-low; forces RESET assertion independent of SENSE state |
| RESET | Active-high reset output | Totem-pole driver; directly interfaces with standard MCU reset pins requiring high-active signal |
| RESET | Active-low reset output | Open-drain; requires external pull-up; used for legacy low-active reset logic or wired-OR configurations |
| NC | No connect | Pin 8 is unconnected; must be left floating or tied to GND per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Power-on reset generator | Asserts RESET at VDD ≥ 1 V, ensuring deterministic initialization before core logic powers up |
| Programmable delay time | External capacitor sets delay (e.g., 100 nF → 2.1 ms), eliminating need for internal RC trimming or firmware timers |
| Defined RESET from VDD ≥1 V | Enables reset assertion during ultra-low-voltage brownout events where other supervisors fail to activate |
| Temperature-compensated reference | Maintains ±1.5% threshold accuracy over –40°C to 85°C, critical for stable operation in variable-temperature enclosures |
| Power-down control support | CONTROL pin enables hardware-driven SRAM chip-select disable during main power loss-preserving data without software intervention |
Applications
| Medical Imaging Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
|
Use Scenario: CT/MRI scanner subsystems require precise power-rail sequencing and brownout detection to prevent corrupted image acquisition or detector calibration drift. IC Role / Device Role / Timing Role: TLC7705IPW monitors the 5 V analog front-end rail and asserts RESET if voltage sags below 4.55 V, halting data capture until stable. Use Value: Prevents invalid scan data due to undervoltage-induced ADC/DAC errors; leverages 70 mV hysteresis to reject transient noise on noisy medical power rails. |
Use Scenario: Programmable logic controller modules operate in electrically noisy factory environments with fluctuating 24 V DC supplies converted to 5 V/3.3 V rails. IC Role / Device Role / Timing Role: TLC7705IPW supervises the 5 V microcontroller supply, triggering hardware reset within 2.1 ms (with 100 nF CT) upon detected drop. Use Value: Eliminates firmware-based watchdog dependency; ensures deterministic recovery without CPU involvement during EMI-induced supply dips. |
| Battery-Backed Data Logger | Point-of-Sale Terminal Power Management |
|
Use Scenario: Remote environmental sensors log data to SRAM with lithium coin-cell backup, requiring seamless transition during main power failure. IC Role / Device Role / Timing Role: TLC7705IPW's CONTROL pin drives SRAM CS low when main VDD collapses, disabling writes while preserving stored data. Use Value: Hardware-level data retention-no firmware latency or interrupt overhead; works even if MCU is already halted. |
Use Scenario: Retail POS terminals use 5 V rails for display, printer, and payment interface ICs; unexpected AC dropout must trigger safe shutdown. IC Role / Device Role / Timing Role: TLC7705IPW monitors 5 V rail and asserts both RESET and RESET to halt processor and enable controlled peripheral power-down sequencing. Use Value: Dual-output architecture allows simultaneous reset of CPU and controlled release of peripheral enables-preventing bus contention or latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7705IPWR | Same electrical specs and pinout; supplied in 2000-piece tape-and-reel (vs. 150-piece tube for TLC7705IPW) | Identical functionality; optimized for automated SMT assembly rather than prototyping or low-volume evaluation | Select TLC7705IPWR for production runs requiring reel-fed placement; TLC7705IPW suits lab validation and small-batch builds. |
| TPS3808G33DBVR | Fixed 3.3 V threshold, 35 µA supply current, 200 ms min delay (non-programmable), SOT-23-6 package | Lacks CONTROL pin and dual RESET outputs; no RAM power-down support; smaller footprint but less flexible timing | Choose TPS3808G33DBVR only for simple 3.3 V rail supervision where programmable delay and SRAM control are unnecessary. |
Compared with TLC7705IPW, TLC7705IPWR offers identical performance in a production-optimized packaging format, while TPS3808G33DBVR trades programmability and dual outputs for lower cost and smaller size in fixed-threshold 3.3 V applications.
Availability
TLC7705IPW is available at Aetrix Electronics and suitable for medical imaging equipment, industrial PLC modules, and battery-backed data loggers requiring stable component supply across extended product lifecycles.
Supply support for TLC7705IPW 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 with emphasis on reliability, longevity, and industrial-grade qualification.
The TLC77xx family was designed specifically for robust, low-power supply supervision in microcomputer and microprocessor systems-prioritizing deterministic reset behavior, wide temperature operation, and hardware-based power-fail response.
FAQ
What is the exact reset threshold voltage of the TLC7705IPW?
The TLC7705IPW has a fixed negative-going input threshold voltage (VIT–) of 4.55 V, with ±0.08 V tolerance (4.47 V to 4.63 V) over the full operating temperature and supply range. This value is factory-trimmed and does not require external resistor programming-unlike the TLC7701 variant.
How do I calculate the reset delay time for the TLC7705IPW?
The reset delay time (td) for TLC7705IPW is calculated using td = 2.1 × 10⁴ × CT, where CT is the external capacitor value in farads. For example, a 100 nF capacitor yields td ≈ 2.1 ms. This relationship is specified in the SLVS087M datasheet and validated across –40°C to 85°C.
Does the TLC7705IPW support battery-backed SRAM power-down control?
Yes, the TLC7705IPW supports battery-backed SRAM power-down control via its CONTROL pin. When CONTROL is driven low, RESET becomes active-high and can be used to disable the SRAM chip select (CS) during main power loss-ensuring data retention without MCU intervention.
What is the maximum supply current of the TLC7705IPW under normal operation?
The maximum supply current (IDD) of the TLC7705IPW is 16 µA at VDD = 5 V and TA = 85°C, as specified in the Electrical Characteristics table of the SLVS087M datasheet. During the delay period (td), current rises to 150 µA max, but returns to ≤16 µA once RESET is deasserted.
Is the TLC7705IPW pin-compatible with other devices in the TLC77xx family?
Yes, all TLC77xx devices-including TLC7705IPW, TLC7733IPW, and TLC7725IPW-share identical TSSOP-8 (PW) pinouts and package dimensions. However, threshold voltages differ (4.55 V, 2.93 V, 2.25 V respectively), so direct substitution requires verification of system voltage requirements.
TLC7705IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.55V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1.1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
TLC7705IPW FAQ
1.How can I place an order for TLC7705IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC7705IPW 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 TLC7705IPW reliable?
The price and inventory of TLC7705IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC7705IPW is usually 5 days.
3.What payment methods are accepted for TLC7705IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC7705IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC7705IPW?
TLC7705IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC7705IPW 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 TLC7705IPW?
For technical support, including TLC7705IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC7705IPW requirements.
6.How does Aetrix verify that TLC7705IPW is sourced from the original manufacturer or authorized distributors?
All TLC7705IPW 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 TLC7705IPW meets industry standards.
7.What is the process for return or replacement of TLC7705IPW?
All TLC7705IPW units undergo pre-shipment inspection (PSI). If there is an issue with TLC7705IPW, 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 TLC7705IPW part is unused and in its original packaging.
Return procedure for TLC7705IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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