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Texas Instruments TLC7705QPW
- Part No.:
- TLC7705QPW
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TLC7705QPW.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,942
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Product details
Overview
TLC7705QPW from Texas Instruments is a micropower supply voltage supervisor IC with fixed 4.55 V sense threshold, operating from 2 V to 6 V supply, delivering 16 µA max supply current, –40°C to 125°C temperature range, and programmable reset delay via external capacitor - used for reliable power-on and undervoltage reset in industrial microcontroller systems.
For engineers reviewing the TLC7705QPW datasheet, TLC7705QPW pinout, TLC7705QPW application, or TLC7705QPW equivalent, this page delivers verified electrical specs, TSSOP-8 package details, functional block context, real-world use cases in medical imaging and battery-backed memory, and validated alternative options for design continuity.
Technical Context
The TLC7705QPW integrates a precision temperature-compensated voltage reference, internal power-on reset generator, and automatic undervoltage detection circuitry that asserts RESET when SENSE falls below 4.55 V (with 70 mV hysteresis) and holds it active for a user-defined delay (td = 2.1 × 10⁴ × CT).
It supports dual-output reset signaling (active-high RESET and active-low RESET), includes CONTROL input for static RAM power-down coordination during brownout, and guarantees defined output states down to VDD ≥ 1 V - enabling robust system initialization and data retention control in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports wide-input industrial and automotive auxiliary rails without external regulation. |
| Sense Threshold Voltage | 4.55 V (typ), ±2% over temp - precisely monitors 4.5 V nominal supplies with built-in hysteresis to prevent chatter. |
| Supply Current | 16 µA max - enables multi-year operation on coin-cell or energy-harvested sources in always-on monitoring systems. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood, motor control, and industrial PLC applications requiring extended thermal margin. |
| Reset Delay Time | Programmable via external CT (td = 2.1 × 10⁴ × CT); e.g., 100 nF yields ~2.1 ms - ensures sufficient CPU boot time before release. |
| Output Drive | ±2 mA at VOL ≤ 0.5 V / VOH ≥ 3.7 V @ VDD = 4.5 V - directly interfaces with standard CMOS logic and microcontroller reset inputs. |
| Power-Up Reset Voltage | 1 V - guarantees early assertion of RESET during slow-ramp power-up, preventing metastability in digital logic. |
Pinout & Package
TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Return path for all internal circuits and output drivers; must be low-impedance to ensure noise immunity and accurate threshold sensing. |
| VDD | Positive supply input | Primary power rail (2–6 V); powers internal reference, comparator, timer, and outputs; requires local 0.1 µF ceramic bypass. |
| SENSE | Voltage monitor input | Connects to monitored rail (e.g., microcontroller core voltage); triggers reset when falling below 4.55 V threshold. |
| CONTROL | RAM power-down enable | When pulled low, configures RESET as active-high for chip-select control of battery-backed SRAM during power loss. |
| RESIN | Manual reset input | Active-low asynchronous reset override; pulls RESET low when asserted, independent of SENSE voltage or delay timing. |
| RESET | Active-high reset output | Drives microcontroller / processor reset pin high during fault condition; remains asserted until delay expires post-recovery. |
| RESET | Active-low reset output | Complementary inverted signal to RESET; used for legacy logic families or dual-signaling reset architectures. |
| NC | No connect | Pin 1 is unconnected - no internal bond; must remain floating or grounded per layout guidelines to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable reset delay | External capacitor sets precise td (1.1–4.2 ms typical with 100 nF), eliminating need for discrete RC networks or firmware timers. |
| Defined reset at low VDD | Guaranteed RESET assertion down to VDD = 1 V ensures reliable startup even with weak or sagging supplies. |
| Static RAM power-down support | CONTROL input enables automatic disabling of SRAM chip select during brownout, preserving data integrity with battery backup. |
| Temperature-compensated reference | Internal bandgap reference maintains ±2% threshold accuracy across –40°C to 125°C, critical for field-deployed equipment. |
| Low quiescent current | 16 µA max IDD allows integration into ultra-low-power IoT edge nodes and battery-powered diagnostics without compromising runtime. |
Applications
| Medical Imaging Power Sequencing | Industrial PLC Brownout Protection |
|---|---|
|
Use Scenario: Ensuring safe power-up sequencing and fault recovery in portable ultrasound and MRI subsystems where supply rails ramp at different rates. IC Role / Device Role / Timing Role: Supervisor IC monitoring main 5 V analog supply and asserting synchronized reset to FPGA, ADC, and DSP after stable voltage and programmable delay. Use Value: Prevents corrupted image acquisition by guaranteeing all logic blocks initialize only after analog rails settle within tolerance. |
Use Scenario: Protecting programmable logic controllers from erratic behavior during factory floor voltage sags caused by motor startups or arc welding. IC Role / Device Role / Timing Role: Undervoltage detector triggering controlled shutdown and nonvolatile register save before VDD drops below 4.55 V. Use Value: Eliminates spurious I/O toggling and program counter corruption by holding CPU in reset until supply recovers and delay expires. |
| Battery-Backed Memory Retention | Automotive Body Control Module |
|
Use Scenario: Maintaining data integrity in EEPROM/SRAM modules during vehicle ignition cycling or alternator load dump events. IC Role / Device Role / Timing Role: Dual-output supervisor using CONTROL input to gate SRAM chip select while asserting RESET to preserve volatile state. Use Value: Enables seamless transition to battery power without software intervention, reducing BOM count versus discrete reset + logic solutions. |
Use Scenario: Providing fail-safe reset for microcontrollers managing door locks, lighting, and HVAC in 12 V automotive systems with wide input transients. IC Role / Device Role / Timing Role: Monitoring switched 5 V rail derived from DC/DC converter; asserting reset if input dips below 4.55 V due to load surge. Use Value: Meets AEC-Q100 Class 0 thermal requirements and delivers deterministic reset timing across –40°C to 125°C ambient. |
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 4.55 V threshold, but in PDIP-8 package with wider 0.3" lead spacing and higher thermal resistance (520 mW @ 25°C vs. 525 mW for PW). | Preferred for through-hole prototyping or legacy board rework; not suitable for space-constrained surface-mount designs. | Select TLC7705IPWR only when manual assembly, socketing, or thermal derating above 85°C is required. |
| TPS3808G33DBVR | Fixed 3.3 V threshold, 350 nA quiescent current, 200 ms factory-fixed delay, and push-pull output - lacks dual RESET/RESET and CONTROL pin functionality. | Targets ultra-low-power always-on sensors; cannot replace TLC7705QPW in RAM power-down or dual-output configurations. | Choose TPS3808G33DBVR only for new designs prioritizing nanoamp operation and single-threshold monitoring without memory control. |
Compared with TLC7705IPWR and TPS3808G33DBVR, the TLC7705QPW uniquely combines TSSOP-8 compactness, dual complementary reset outputs, and dedicated CONTROL pin for battery-backed SRAM - making it irreplaceable in space-limited industrial controllers requiring coordinated power-down logic.
Availability
TLC7705QPW is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLC7705QPW 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 heritage in precision analog ICs and industrial-grade reliability.
The TLC77xx family was designed specifically for robust power-supply monitoring in microcomputer and microprocessor systems - emphasizing micropower operation, wide temperature performance, and integrated power-down control for battery-backed memory.
FAQ
What is the exact sense threshold voltage of the TLC7705QPW?
The TLC7705QPW has a fixed negative-going input threshold voltage (VIT–) of 4.55 V (typical), with guaranteed min/max of 4.47 V and 4.63 V over full temperature and supply range. This value is factory-trimmed and does not require external resistor programming, unlike the TLC7701 variant.
Does the TLC7705QPW support both active-high and active-low reset outputs simultaneously?
Yes, the TLC7705QPW provides two complementary reset outputs: RESET (active-high) and RESET (active-low). Both are driven concurrently from the same internal timing and sensing circuitry, enabling direct interface with mixed-logic systems without external inverters.
How is the reset delay time set on the TLC7705QPW?
The reset delay time (td) on the TLC7705QPW is set externally using a capacitor CT connected between the CT pin and GND. The relationship is td = 2.1 × 10⁴ × CT (seconds), so a 100 nF capacitor yields approximately 2.1 ms delay - confirmed in datasheet Figure 7 and Table 1.
Can the TLC7705QPW operate reliably at 2 V supply voltage?
Yes, the TLC7705QPW is fully specified from 2 V to 6 V. At VDD = 2 V, it maintains 1.8 V high-level output voltage (VOH), 0.2 V low-level output voltage (VOL), and continues to assert RESET down to VDD ≥ 1 V - ensuring functional reset generation even during deep brownout conditions.
What is the function of the CONTROL pin on the TLC7705QPW?
The CONTROL pin on the TLC7705QPW enables power-down coordination for static RAM with battery backup. When CONTROL is tied low, RESET becomes active-high and can directly drive the SRAM chip-select line, automatically disabling memory access during power failure - as detailed in Figure 10 of the SLVS087M datasheet.
TLC7705QPW 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
TLC7705QPW FAQ
1.How can I place an order for TLC7705QPW through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC7705QPW 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 TLC7705QPW reliable?
The price and inventory of TLC7705QPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC7705QPW is usually 5 days.
3.What payment methods are accepted for TLC7705QPW?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC7705QPW?
TLC7705QPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC7705QPW 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 TLC7705QPW?
For technical support, including TLC7705QPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC7705QPW requirements.
6.How does Aetrix verify that TLC7705QPW is sourced from the original manufacturer or authorized distributors?
All TLC7705QPW 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 TLC7705QPW meets industry standards.
7.What is the process for return or replacement of TLC7705QPW?
All TLC7705QPW units undergo pre-shipment inspection (PSI). If there is an issue with TLC7705QPW, 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 TLC7705QPW part is unused and in its original packaging.
Return procedure for TLC7705QPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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