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Texas Instruments TLC7733QDR
- Part No.:
- TLC7733QDR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC7733QDR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,380
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Product details
Overview
TLC7733QDR from Texas Instruments is a micropower supply voltage supervisor IC with fixed 2.93 V threshold, active-low RESET output, programmable delay via external capacitor, and operation across –40°C to 125°C. It provides power-on reset, undervoltage supervision, and power-down control for static RAM with battery backup in microprocessor systems.
For engineers reviewing the TLC7733QDR datasheet, TLC7733QDR pinout, TLC7733QDR application, or TLC7733QDR equivalent, this page delivers verified specifications, DRB-package terminal mapping, real-world use cases in medical imaging and industrial control, and validated alternative options for design continuity.
Technical Context
The TLC7733QDR implements a precision voltage-sensing comparator with temperature-compensated internal reference and hysteresis (70 mV), ensuring stable reset assertion during supply transients. Its internal timer generates a user-defined delay (td = 2.1 × 10⁴ × CT) before deasserting RESET after SENSE voltage recovers above threshold.
It supports dual-mode reset control: standard undervoltage monitoring on SENSE, and CONTROL-pin-enabled active-high RESET for memory power-down sequencing. The device asserts RESET when VDD ≥ 1 V and maintains it until SENSE exceeds 2.93 V and the delay expires.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 2.93 V (fixed negative-going trip point for SENSE input; ensures reliable detection of 3.3 V rail brownout) |
| Supply Range | 2 V to 6 V (supports operation from single Li-ion to 5 V logic rails without external regulation) |
| Supply Current | 9–16 µA (ultra-low quiescent current enables years of battery-backed operation) |
| Reset Delay | Programmable via external CT (e.g., 100 nF yields 2.1 ms typical delay; critical for CPU initialization timing) |
| Operating Temp | –40°C to 125°C (qualified for automotive under-hood and industrial motor-control environments) |
| Output Type | Active-low totem-pole RESET (drives 2 mA sink at 0.5 V max VOL; directly interfaces with most microcontroller reset inputs) |
| Hysteresis | 70 mV (prevents chatter during slow-rising or noisy supply conditions) |
Pinout & Package
The TLC7733QDR is housed in an 8-pin SON (Small Outline No-lead) package, designated DRB, measuring 3.0 mm × 3.0 mm × 0.9 mm with wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 2–6 V; powers internal reference, comparator, and output stage |
| GND | Ground reference | Return path for all currents; must be low-impedance for stable threshold accuracy |
| SENSE | Voltage monitor input | Compares applied voltage against 2.93 V internal threshold; high-impedance (≤10 µA input leakage) |
| CONTROL | Reset polarity select | Low = active-high RESET; high = active-low RESET; enables memory CS control during power loss |
| RESIN | Manual reset input | Active-low asynchronous reset override; pulls RESET low when asserted |
| RESET | Active-low reset output | Open-drain compatible totem-pole output; sinks 2 mA minimum at 0.5 V |
| RESET | Active-high reset output | Complementary to RESET; driven high when RESET is low |
| CT | Delay timing capacitor connection | Connects external capacitor to set reset timeout; 0.1 µF yields ~2.1 ms typical delay |
Key Features
| Feature | Design Value |
|---|---|
| Power-on reset generation | Asserts RESET at VDD ≥ 1 V - ensures CPU remains held until minimal supply stability is achieved |
| Programmable reset delay | Configurable via single external capacitor (CT); eliminates need for discrete RC networks or timers |
| Battery-backed RAM support | CONTROL pin enables automatic chip-select disable during main power failure - preserves data integrity |
| Micropower operation | Max 16 µA supply current - extends battery life in portable and remote sensor applications |
| Wide temperature range | –40°C to 125°C operation - qualified for harsh environments including automotive engine control units |
| Temperature-compensated reference | Stable 2.93 V threshold over full temp range - avoids calibration drift in precision monitoring systems |
Applications
| Medical Imaging Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
|
Use Scenario: Ensuring clean boot and fault-safe shutdown in MRI gradient amplifier control boards where 3.3 V FPGA supplies must stabilize before configuration. IC Role / Device Role / Timing Role: Monitors 3.3 V rail (SENSE), asserts RESET until voltage exceeds 2.93 V + hysteresis, then delays 2.1 ms before release to meet FPGA TSTART requirement. Use Value: Prevents partial configuration and metastability by guaranteeing FPGA reset duration exceeds minimum spec (≥2 ms), even during cold-start voltage ramp. |
Use Scenario: Supervising isolated 24 V DC-to-3.3 V converter outputs in modular I/O backplanes subject to EMI-induced dips. IC Role / Device Role / Timing Role: Detects 3.3 V rail drop below 2.93 V, holds microcontroller in reset for programmable duration while upstream regulator recovers. Use Value: Eliminates spurious reboots caused by transient noise; 70 mV hysteresis prevents oscillation during marginal supply conditions. |
| Automotive Body Control Module (BCM) | Energy Meter Data Logger Backup |
|
Use Scenario: Monitoring 5 V system rail in BCMs operating near engine bay ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Provides temperature-stable 2.93 V threshold supervision with guaranteed operation across full –40°C to 125°C range. Use Value: Maintains reset integrity without derating or external compensation - reduces BOM count versus discrete solutions. |
Use Scenario: Enabling automatic SRAM retention during AC mains failure in smart electricity meters using coin-cell backup. IC Role / Device Role / Timing Role: Uses CONTROL pin tied to MCU bank select signal to drive SRAM CS low during power loss, disabling writes while preserving contents. Use Value: Guarantees zero-data-loss write abort during brownout - meets IEC 62056-21 metering compliance requirements. |
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; 350 ms factory-programmed delay; 1.5 µA quiescent current | Lacks CONTROL pin for memory power-down; no manual RESIN input | Preferred for simple 3.3 V rail monitoring where ultra-low IQ and fixed delay suffice |
| MAX6326UT33+T | 3.3 V threshold; 140 ms min delay; push-pull RESET; ±1.5% threshold accuracy | No SENSE/CONTROL flexibility; higher 12 µA IQ; only –40°C to 85°C rated | Suitable for commercial-grade 3.3 V systems requiring tighter threshold tolerance but not extended temperature range |
Compared with TLC7733QDR, TPS3808G33DBVR offers lower IQ and simpler integration but forfeits programmable delay and memory control features; MAX6326UT33+T provides superior threshold accuracy yet lacks the extended temperature rating and flexible reset architecture required for automotive or industrial deployment.
Availability
TLC7733QDR is available at Aetrix Electronics and suitable for medical imaging equipment, automotive body control modules, and industrial programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLC7733QDR 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 monitoring in microcomputer and microprocessor systems - prioritizing precision threshold stability, wide temperature operation, and integrated power-down control for battery-backed memory.
FAQ
What is the exact threshold voltage of the TLC7733QDR?
The TLC7733QDR has a fixed negative-going input threshold voltage of 2.93 V on the SENSE pin, with ±70 mV hysteresis. This value is specified across the full operating temperature range (–40°C to 125°C) and supply voltage range (2 V to 6 V), ensuring consistent brownout detection for 3.3 V systems.
How do I configure the reset delay time for the TLC7733QDR?
The reset delay time (td) of the TLC7733QDR is set by an external capacitor connected to the CT pin using the formula td = 2.1 × 10⁴ × CT. For example, a 100 nF capacitor yields a typical delay of 2.1 ms. The capacitor must be placed close to the CT pin with short traces to minimize noise coupling and ensure timing accuracy.
Does the TLC7733QDR support active-high reset output?
Yes, the TLC7733QDR provides both active-low RESET and active-high RESET outputs simultaneously. The polarity of the primary RESET output is controlled by the CONTROL pin: when CONTROL is low, RESET is active-high; when CONTROL is high, RESET is active-low - enabling direct interface with diverse microcontroller reset architectures.
Can the TLC7733QDR be used to protect battery-backed SRAM during power failure?
Yes, the TLC7733QDR includes dedicated power-down control logic. By connecting the CONTROL pin to the microprocessor's memory bank select signal and driving SRAM chip select (CS) with RESET, the device automatically disables the memory during main power loss - preserving data integrity without additional logic or firmware intervention.
What package type and dimensions does the TLC7733QDR use?
The TLC7733QDR uses the DRB package: an 8-pin SON (Small Outline No-lead) measuring 3.0 mm × 3.0 mm × 0.9 mm with wettable flanks. This RoHS-compliant, lead-free package supports automated optical inspection and is optimized for space-constrained industrial and automotive PCB layouts.
TLC7733QDR 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:
- 2.93V
- 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
TLC7733QDR FAQ
1.How can I place an order for TLC7733QDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC7733QDR 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 TLC7733QDR reliable?
The price and inventory of TLC7733QDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC7733QDR is usually 5 days.
3.What payment methods are accepted for TLC7733QDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC7733QDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC7733QDR?
TLC7733QDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC7733QDR 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 TLC7733QDR?
For technical support, including TLC7733QDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC7733QDR requirements.
6.How does Aetrix verify that TLC7733QDR is sourced from the original manufacturer or authorized distributors?
All TLC7733QDR 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 TLC7733QDR meets industry standards.
7.What is the process for return or replacement of TLC7733QDR?
All TLC7733QDR units undergo pre-shipment inspection (PSI). If there is an issue with TLC7733QDR, 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 TLC7733QDR part is unused and in its original packaging.
Return procedure for TLC7733QDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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