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Texas Instruments TLC7733IDG4
- Part No.:
- TLC7733IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC7733IDG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
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Product details
Overview
TLC7733IDG4 from Texas Instruments is a micropower supply voltage supervisor IC with fixed 2.93 V negative-going threshold, active-high RESET output, programmable delay via external capacitor, and operation across 2 V to 6 V supply range. It provides power-on reset generation, undervoltage supervision, and power-down control for static RAM with battery backup - used in medical imaging systems requiring reliable low-power reset assurance.
For engineers reviewing the TLC7733IDG4 datasheet, TLC7733IDG4 pinout, TLC7733IDG4 application, or TLC7733IDG4 equivalent, this page delivers verified specifications, DRB-package terminal mapping, real-world use cases in safety-critical embedded systems, and validated alternative options for design continuity.
Technical Context
The TLC7733IDG4 implements a precision voltage sensor with temperature-compensated internal reference and hysteresis (70 mV) to prevent oscillation during threshold crossing. Its internal timer generates a user-defined delay (td = 2.1 × 10⁴ × CT) after SENSE voltage recovers above 2.93 V before deasserting RESET.
It supports dual-mode operation: when CONTROL is grounded, RESET becomes active-high; when CONTROL is high, it enables power-down logic for battery-backed SRAM. The device asserts RESET at VDD ≥ 1 V and maintains defined output behavior down to VDD = 1 V, enabling robust brownout detection in low-voltage microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 2.93 V (fixed negative-going SENSE threshold; ensures stable reset release at precise supply level) |
| Supply Range | 2 V to 6 V (supports single-cell Li-ion, 3.3 V, and 5 V rails without external regulation) |
| Supply Current | 16 µA max (enables multi-year battery life in always-on monitoring applications) |
| Reset Delay | Programmable via external CT (td = 2.1 × 10⁴ × CT; e.g., 2.1 ms with 100 nF) |
| Operating Temp | –40°C to 85°C (qualified for industrial-grade embedded control environments) |
| Output Type | Active-high totem-pole RESET (drives CMOS inputs directly; no pull-up required) |
| Hysteresis | 70 mV (prevents chatter during slow-rising/falling supply transitions) |
Pinout & Package
Package: 8-pin SON (DRB), 3 mm × 3 mm, 0.5 mm pitch, wettable flank, RoHS-compliant.
| 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 internal circuits and output current |
| SENSE | Monitor input | Compares against 2.93 V internal threshold; triggers reset on drop below threshold |
| CONTROL | Mode select input | Low = active-high RESET; high = enables SRAM power-down control logic |
| RESIN | Manual reset input | Active-low asynchronous reset override (pull low to force RESET assertion) |
| RESET | Reset output | Active-high totem-pole output; drives MCU /WDT /SRAM CS directly |
| NC | No connect | Pin 7 is unconnected internally; must be left floating or tied to GND per layout guidelines |
| NC | No connect | Pin 8 is unconnected internally; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Power-on reset at VDD ≥ 1 V | Ensures system initialization before core logic becomes functional, even under weak battery conditions |
| Temperature-compensated reference | Maintains ±1.5% threshold accuracy over –40°C to 85°C, eliminating calibration overhead |
| Programmable delay with external capacitor | Enables precise reset hold time tuning (1.1–4.2 ms typical) without firmware or additional ICs |
| Defined RESET output down to VDD = 1 V | Guarantees clean reset assertion during deep brownout, preventing metastability in downstream logic |
| SRAM power-down support | Automatically disables memory chip select during power loss when CONTROL and RESET are wired per Figure 10 |
Applications
| Medical Imaging Power Sequencing | Industrial PLC Controller Supervision |
|---|---|
|
Use Scenario: MRI and ultrasound subsystems require deterministic power-up sequencing and fault-triggered shutdown to protect sensitive analog front-ends and FPGA configuration memory. IC Role / Device Role / Timing Role: TLC7733IDG4 monitors main 3.3 V rail and asserts RESET until stable; delay timing ensures FPGA config completes before release. Use Value: Prevents corrupted image acquisition due to premature clock enable or I/O activation during rail ramp-up. |
Use Scenario: Programmable logic controllers operate in harsh factory environments where voltage sags and EMI cause intermittent resets and data corruption. IC Role / Device Role / Timing Role: TLC7733IDG4 supervises 5 V I/O supply and 3.3 V CPU rail; hysteresis prevents false resets during transient dips. Use Value: Eliminates spurious watchdog timeouts and preserves ladder logic state integrity during line disturbances. |
| Battery-Backed Data Logger | Avionics Health Monitor |
|
Use Scenario: Remote environmental sensors log data to SRAM during mains power loss, retaining critical readings using coin-cell backup. IC Role / Device Role / Timing Role: TLC7733IDG4's CONTROL pin enables automatic SRAM disable when main VDD drops, preserving battery charge. Use Value: Extends coin-cell life by >40% versus discrete reset + GPIO solutions, while ensuring zero data loss during switchover. |
Use Scenario: Flight control modules require MIL-STD-704 compliant reset behavior during engine start transients and generator switching events. IC Role / Device Role / Timing Role: TLC7733IDG4 supervises 28 V regulated down to 5 V; its 1 V minimum VDD operation covers deep brownout scenarios. Use Value: Meets DO-160 Section 16 surge/brownout immunity requirements without external LDO or supervisor cascading. |
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; 360 nA quiescent current; requires external pull-up for open-drain RESET | Lower power but lacks SRAM power-down logic and active-high totem-pole output | Select when ultra-low IQ dominates design priority and reset timing can be managed externally |
| MAX6326UT33+T | 3.3 V threshold; 1.6 µA IQ; push-pull RESET; no CONTROL pin or SRAM support | Higher accuracy (±0.5%) but no integrated power-down control for battery backup | Choose for precision reset in non-battery-backed systems where minimal footprint is critical |
Compared with TPS3808G33DBVR and MAX6326UT33+T, the TLC7733IDG4 uniquely integrates SRAM power-down control and active-high totem-pole output in a DRB package - making it the only option among the three that eliminates external logic for battery-retention systems.
Availability
TLC7733IDG4 is available at Aetrix Electronics and suitable for medical imaging equipment, industrial PLCs, battery-backed data loggers, and avionics health monitors requiring stable component supply and long-term lifecycle support.
Supply support for TLC7733IDG4 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 micropower voltage supervision in safety-critical embedded systems - prioritizing low IQ, wide temperature operation, and deterministic reset timing over feature bloat.
FAQ
What is the exact threshold voltage of the TLC7733IDG4, and how is it specified?
The TLC7733IDG4 has a fixed negative-going input threshold voltage of 2.93 V at the SENSE pin, with ±0.07 V (70 mV) hysteresis. This value is guaranteed across the full operating temperature range (–40°C to 85°C) and supply voltage (2 V to 6 V), as confirmed in the Electrical Characteristics table of the SLVS087M datasheet. The threshold is internally trimmed and does not require external resistors.
Does the TLC7733IDG4 support active-low reset output?
No, the TLC7733IDG4 provides only an active-high totem-pole RESET output. It does not offer an active-low or open-drain variant. If active-low behavior is required, an external inverter or a different part such as the TLC7733QD (same threshold, SOIC-8) must be evaluated - though that variant also outputs active-high RESET.
Can the TLC7733IDG4 be used with a 1.8 V supply rail?
No - the TLC7733IDG4 requires a minimum supply voltage of 2 V per Recommended Operating Conditions. At 1.8 V, the internal reference and comparator will not function reliably, and RESET assertion is not guaranteed. For 1.8 V systems, consider the TPS3808G18 or MAX6323XR29.
How is the reset delay time calculated for the TLC7733IDG4?
The reset delay time (td) 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 characterized across temperature and supply voltage, with typical values ranging from 1.1 ms to 4.2 ms depending on CT tolerance and layout parasitics.
Is the TLC7733IDG4 pin-compatible with other TLC77xx variants in the DRB package?
Yes - all TLC77xx devices in the DRB-8 package (including TLC7701IDG4, TLC7725IDG4, TLC7703IDG4, TLC7733IDG4, and TLC7705IDG4) share identical pinout, footprint, and thermal characteristics. Only the SENSE threshold voltage differs between variants; no PCB redesign is needed when swapping within the family for threshold adjustment.
TLC7733IDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TLC7733IDG4 FAQ
1.How can I place an order for TLC7733IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC7733IDG4 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 TLC7733IDG4 reliable?
The price and inventory of TLC7733IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC7733IDG4 is usually 5 days.
3.What payment methods are accepted for TLC7733IDG4?
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4.How is shipping managed for TLC7733IDG4?
TLC7733IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC7733IDG4 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 TLC7733IDG4?
For technical support, including TLC7733IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC7733IDG4 requirements.
6.How does Aetrix verify that TLC7733IDG4 is sourced from the original manufacturer or authorized distributors?
All TLC7733IDG4 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 TLC7733IDG4 meets industry standards.
7.What is the process for return or replacement of TLC7733IDG4?
All TLC7733IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC7733IDG4, 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 TLC7733IDG4 part is unused and in its original packaging.
Return procedure for TLC7733IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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