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Texas Instruments TLC7703QD
- Part No.:
- TLC7703QD
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC7703QD.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,535
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Product details
Overview
TLC7703QD from Texas Instruments is a micropower supply voltage supervisor IC with fixed 2.63 V sense threshold, operating from 2 V to 6 V supply, delivering ≤16 µA quiescent current and –40°C to 125°C extended temperature range. It provides power-on reset generation, undervoltage monitoring, programmable delay via external capacitor, and power-down control for battery-backed static RAM in microprocessor systems.
For engineers reviewing the TLC7703QD datasheet, TLC7703QD pinout, TLC7703QD application, or TLC7703QD equivalent, this page delivers verified electrical specs, SOIC-8 package details, functional block context, real-world use cases in industrial and automotive power management, and two validated alternative supervisors with documented threshold and timing differences.
Technical Context
The TLC7703QD implements a precision bandgap-based voltage reference with temperature compensation to maintain stable 2.63 V (±3%) negative-going input threshold at SENSE across –40°C to 125°C. Its internal timer generates a user-programmable reset delay (td = 2.1 × 10⁴ × CT) after voltage recovery, ensuring reliable system initialization.
It features dual active-low and active-high RESET outputs, totem-pole drive capability (±2 mA), defined output behavior down to VDD ≥1 V, and logic-controlled power-down support for static RAM retention during brownout-enabled by CONTROL pin assertion to ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports wide-input industrial and automotive rails without external regulation |
| Sense Threshold Voltage | 2.63 V (min 2.56 V, max 2.70 V) - fixed precision threshold for 3.3 V system monitoring |
| Quiescent Supply Current | ≤16 µA - enables multi-year battery operation in always-on monitoring circuits |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial control environments |
| Reset Delay Time | Programmable via external CT (e.g., 100 nF → 2.1 ms) - ensures sufficient hold time for CPU/MCU boot sequence |
| Output Drive Strength | ±2 mA - directly drives standard logic inputs and small capacitive loads without buffering |
| Power-Up Reset Voltage | 1 V - guarantees early reset assertion during slow-ramp power supplies |
Pinout & Package
Package: SOIC-8 (D package), 3.91 mm × 4.90 mm, surface-mount, RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Primary power rail connection; device operates with defined outputs down to 1 V |
| GND | Ground reference | Return path for all internal circuitry and output drivers |
| SENSE | Voltage monitor input | Monitors system supply or rail; asserts reset when voltage falls below 2.63 V |
| CONTROL | Power-down mode select | When tied to GND, configures RESET as active-high for RAM chip-select control |
| RESIN | Manual reset input | Active-low asynchronous reset trigger; overrides voltage-monitoring state |
| RESET | Active-low reset output | Open-drain compatible output; sinks up to 10 mA; requires external pull-up |
| RESET | Active-high reset output | Push-pull totem-pole output; drives high/low without external components |
| NC | No connect | Unused pin; must remain unconnected per TI design guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Temperature-compensated voltage reference | Maintains ±3% threshold accuracy over –40°C to 125°C, eliminating need for external calibration |
| Programmable reset delay | Delay time set by single external capacitor (td = 2.1 × 10⁴ × CT), enabling precise boot timing control |
| Defined output behavior at low VDD | Guaranteed RESET assertion down to VDD ≥1 V, critical for slow-start or energy-harvesting supplies |
| Power-down control for SRAM | CONTROL pin enables automatic disable of battery-backed memory during power loss, preserving data integrity |
| Low-power totem-pole outputs | Eliminates external pull-up resistors on RESET while maintaining <16 µA total supply current |
Applications
| Industrial PLC Power Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: Continuous monitoring of 3.3 V microcontroller supply in programmable logic controllers exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset and brownout detection with 2.63 V threshold and 2.1 ms delay (CT = 100 nF). Use Value: Prevents erratic MCU operation during line transients; meets IEC 61000-4-11 immunity requirements via guaranteed reset hold time. | Use Scenario: Supervising 5 V domain powering door module microcontrollers in vehicles with stop-start systems. IC Role / Device Role / Timing Role: Dual-output supervisor asserting both active-low and active-high reset signals during cold-crank voltage sag. Use Value: Ensures deterministic restart after engine cranking dips to 2.8 V; RESET remains asserted until stable 5 V returns and 2.1 ms delay expires. |
| Medical Imaging Power Sequencing | Energy Meter Data Retention |
Use Scenario: Managing power-up sequencing and fault response in portable ultrasound units using non-magnetic DRB-package variants (TLC7703IDRBT-NM). IC Role / Device Role / Timing Role: Supervisor with CONTROL pin configured to gate SRAM chip-select during AC power loss, enabling battery-backed data preservation. Use Value: Maintains volatile acquisition buffers during brief outages; eliminates need for external logic or FPGA glue logic. | Use Scenario: Protecting metering SoC configuration and tariff data during utility grid fluctuations in smart electricity meters. IC Role / Device Role / Timing Role: Micropower supervisor detecting 3.3 V rail collapse and triggering controlled shutdown of flash writes before backup battery takes over. Use Value: Reduces risk of flash corruption by synchronizing reset assertion with write-complete signals and battery switchover timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7703IP | Same 2.63 V threshold and SOIC-8 footprint, but rated for –40°C to 85°C only | Not suitable for under-hood or high-ambient industrial deployments requiring 125°C operation | Select TLC7703IP only for commercial-grade applications where extended temperature is unnecessary |
| TPS3808G33 | 3.3 V fixed threshold, 1.8 µA typical supply current, 200 ms factory-fixed delay (no capacitor option) | Lacks programmable delay and CONTROL pin for SRAM power-down; optimized for ultra-low-power, fixed-timing use | Choose TPS3808G33 when minimal current draw dominates over flexibility in delay or memory control |
Compared with TLC7703IP, the TLC7703QD adds full automotive-grade temperature qualification and identical functionality; versus TPS3808G33, it trades lower quiescent current for field-programmable delay and integrated SRAM power-down logic-making it preferable for systems requiring timing adaptability and battery-backed memory control.
Availability
TLC7703QD is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLC7703QD 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 automotive and industrial qualification expertise.
The TLC77xx family was designed specifically for robust, low-power supply supervision in microcomputer and microprocessor systems-emphasizing precision threshold stability, wide temperature operation, and integrated power-down control for battery-backed memory.
FAQ
What is the exact sense threshold voltage of the TLC7703QD?
The TLC7703QD has a fixed negative-going input threshold voltage of 2.63 V, with a guaranteed range of 2.56 V to 2.70 V across its full –40°C to 125°C operating temperature range. This value is factory-trimmed and temperature-compensated using an internal bandgap reference, and applies specifically to the SENSE pin under recommended operating conditions (VDD = 2 V to 6 V). The TLC7703QD does not support external resistor programming like the TLC7701.
Does the TLC7703QD support programmable reset delay, and how is it implemented?
Yes, the TLC7703QD supports programmable reset delay via an external capacitor connected to the CT pin (Pin 8 in SOIC-8). The delay time is calculated as td = 2.1 × 10⁴ × CT, where CT is in farads and td is in seconds-for example, a 100 nF capacitor yields a nominal 2.1 ms delay. This delay begins after the SENSE voltage rises above the 2.63 V threshold and ensures stable system reset before releasing the processor.
How does the CONTROL pin function in the TLC7703QD?
The CONTROL pin on the TLC7703QD determines the polarity of the RESET output. When CONTROL is tied to GND, RESET becomes active-high-enabling direct connection to the chip-select (CS) input of battery-backed static RAM to disable memory access during power failure. When CONTROL is left open or pulled high, RESET operates as active-low. This feature allows the TLC7703QD to manage data retention without external logic gates.
What is the maximum supply current of the TLC7703QD, and under what conditions is it measured?
The maximum supply current of the TLC7703QD is 16 µA, measured under recommended operating conditions: VDD = 5 V, RESIN = VDD, SENSE = VDD ≥ VITmax + 0.2 V, CONTROL = 0 V, and outputs open. This specification holds across the full –40°C to 125°C temperature range and confirms suitability for battery-powered and energy-constrained applications where micropower operation is essential.
Is the TLC7703QD pin-compatible with other members of the TLC77xx family?
Yes, the TLC7703QD is pin-compatible with all SOIC-8 variants in the TLC77xx family-including TLC7701QD, TLC7725QD, TLC7733QD, and TLC7705QD-sharing identical pinout, package dimensions, and interface logic. However, threshold voltages differ (e.g., 2.25 V for TLC7725QD, 2.93 V for TLC7733QD), so substitution requires verification of system voltage monitoring requirements and may necessitate layout review if timing or drive strength differs.
TLC7703QD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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 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-SOIC
TLC7703QD FAQ
1.How can I place an order for TLC7703QD through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC7703QD 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 TLC7703QD reliable?
The price and inventory of TLC7703QD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC7703QD is usually 5 days.
3.What payment methods are accepted for TLC7703QD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC7703QD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC7703QD?
TLC7703QD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC7703QD 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 TLC7703QD?
For technical support, including TLC7703QD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC7703QD requirements.
6.How does Aetrix verify that TLC7703QD is sourced from the original manufacturer or authorized distributors?
All TLC7703QD 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 TLC7703QD meets industry standards.
7.What is the process for return or replacement of TLC7703QD?
All TLC7703QD units undergo pre-shipment inspection (PSI). If there is an issue with TLC7703QD, 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 TLC7703QD part is unused and in its original packaging.
Return procedure for TLC7703QD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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