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Texas Instruments TL7733BCDR
- Part No.:
- TL7733BCDR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7733BCDR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,184
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Product details
Overview
TL7733BCDR from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microprocessor and microcontroller systems. It monitors the SENSE input for undervoltage conditions, provides true and complement reset outputs (RESET and RESET), features a 3.08 V nominal threshold voltage with 10 mV hysteresis, and supports adjustable reset pulse duration via external CT capacitor. It operates across 3.6 V to 18 V supply range and is rated for 0°C to 70°C ambient.
For engineers reviewing the TL7733BCDR datasheet, TL7733BCDR pinout, TL7733BCDR application, or TL7733BCDR equivalent, this page delivers verified functional identity, confirmed SOIC-8 package mapping, validated timing and threshold specifications, and real-world implementation context for embedded power-on reset and brownout detection in industrial and computing systems.
Technical Context
The TL7733BCDR integrates a temperature-compensated bandgap reference, dual comparators for precise undervoltage sensing, and an internal current source that charges the external CT capacitor to set reset pulse width (td ≈ 2.6 × 10⁴ × CT). Its SENSE input detects supply drops below 3.03 V (min) with 10 mV hysteresis, while RESET remains active low and RESET active high during fault conditions.
It supports manual reset assertion via RESIN input, defines RESET output down to VCC ≥ 1 V, and requires a 0.1 µF capacitor on REF to suppress transients. The device uses open-collector outputs requiring external pullup/pulldown resistors and mandates matched termination on both RESET and RESET to prevent waveform plateauing and undefined states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT– Threshold | 3.03 V (min), 3.08 V (typ), 3.13 V (max) - precise undervoltage trip point for 3.3 V rail monitoring |
| Hysteresis | 10 mV - prevents chatter during slow-rising/falling supply transitions |
| Supply Range | 3.6 V to 18 V - supports wide-input industrial and legacy 5 V/12 V systems |
| Reset Output Drive | ±20 mA - sufficient to directly drive microcontroller reset pins without buffer |
| Operating Temp | 0°C to 70°C - commercial-grade qualification for notebooks, STB, and factory automation |
| Reference Voltage | 2.48 V to 2.58 V - stable internal reference enabling accurate threshold generation |
| Power-Up Reset | Active at VCC ≥ 1 V - ensures early reset assertion during power ramp-up |
Pinout & Package
TL7733BCDR is housed in an 8-pin SOIC (D) package, 4.90 mm × 3.91 mm body size, RoHS-compliant with NiPdAu lead finish and moisture sensitivity level (MSL) Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference voltage output | 2.5 V ±2.5% source for external filtering; requires 0.1 µF decoupling to suppress noise-induced false triggers |
| 2 - RESIN | Manual reset input | Active-low control: pulls RESET high and RESET low when asserted; enables system-initiated reset independent of supply |
| 3 - CT | Timing capacitor input | Connects to external capacitor (e.g., 0.1 µF) to set reset pulse width; td ≈ 26 ms per µF |
| 4 - GND | Ground reference | Common return path for all internal circuits; must be low-impedance and tied to system ground plane |
| 5 - RESET | Active-low reset output | Open-collector output; requires external pullup resistor (e.g., 10 kΩ) to interface with 3.3 V/5 V logic |
| 6 - RESET | Active-high reset output | Open-collector output; requires external pulldown resistor (e.g., 10 kΩ); complements RESET for dual-signaling |
| 7 - SENSE | Supply voltage monitor input | High-impedance input for direct connection to regulated rail (e.g., 3.3 V); trip occurs at VIT– |
| 8 - VCC | Positive supply input | Primary power input (3.6–18 V); powers internal circuitry and enables reset assertion at ≥1 V |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable reset pulse duration | Set via CT capacitor (e.g., 0.1 µF → ~2.6 ms delay), enabling design-specific reset hold time without firmware dependency |
| Precision voltage sensor with hysteresis | 3.08 V ±2.5% threshold with 10 mV hysteresis ensures reliable detection of 3.3 V rail brownouts without oscillation |
| True and complement reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals simplify interfacing with diverse MCU reset architectures |
| RESET output defined down to VCC ≥ 1 V | Guarantees valid reset assertion during initial power ramp-up, preventing premature processor release |
| Temperature-compensated reference | Internal 2.5 V reference stable over 0°C–70°C enables consistent threshold accuracy across operating range |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
|
Use Scenario: Monitors 3.3 V I/O rail in programmable logic controller CPU module during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset and brownout detection; asserts RESET until SENSE exceeds 3.08 V + hysteresis. Use Value: Prevents corrupted register writes and firmware lockup by ensuring full rail stabilization before processor initialization. |
Use Scenario: Supervises 3.3 V core supply in multi-port Ethernet router ASIC subsystem during thermal throttling or PoE negotiation events. IC Role / Device Role / Timing Role: Reset controller with manual override (RESIN) for remote recovery; CT-timed pulse guarantees minimum 2 ms reset hold. Use Value: Eliminates need for software watchdog timeout; hardware-level reset restores link integrity faster than OS-level reboot. |
| Smart Building HVAC Controller | STB Power Sequencing |
|
Use Scenario: Ensures clean startup of ARM-based HVAC controller after AC power restoration following grid outage. IC Role / Device Role / Timing Role: Dual-output supervisor driving both processor reset and FPGA configuration enable lines synchronously. Use Value: Matches reset timing requirements of heterogeneous SoC+FPGA architecture without custom timing circuitry. |
Use Scenario: Coordinates power-up sequencing between 1.2 V SoC core, 3.3 V I/O, and 12 V tuner supply in digital set-top box. IC Role / Device Role / Timing Role: SENSE-connected to 3.3 V rail; RESET used to gate 1.2 V LDO enable, enforcing strict voltage order. Use Value: Enforces I/O rail readiness before core activation, preventing latch-up and bus contention during boot. |
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, no RESIN pin, 200 ms min reset pulse (non-adjustable), lower quiescent current (1.1 µA) | Lacks manual reset and adjustable timing; suited for simple, low-power 3.3 V systems without sequencing needs | Select if board space and ultra-low IQ outweigh flexibility; not drop-in due to missing RESIN and CT functionality |
| MAX809SEUR+T | 3.08 V threshold, no complement output, no RESIN or CT, fixed 140 ms reset pulse, SOT-23-3 package | Single-output, minimal-feature supervisor; lacks dual reset signaling and manual override capability | Choose only for cost-sensitive, space-constrained designs where RESET-only assertion suffices |
Compared with TL7733BCDR, TPS3808G33DBVR offers superior power efficiency but sacrifices timing adjustability and manual reset; MAX809SEUR+T reduces footprint and BOM count but eliminates critical features like complement output and RESIN control required for robust system recovery.
Availability
TL7733BCDR is available at Aetrix Electronics and suitable for industrial PLC controllers, network infrastructure equipment, smart building HVAC systems, and STB power sequencing requiring stable component supply and long-term production continuity.
Supply support for TL7733BCDR 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 and embedded processing technologies, with decades of expertise in power management and signal chain solutions.
The TL77xxB family was developed specifically for reliable reset control in microprocessor-based systems, emphasizing precision threshold accuracy, flexible timing, and robust operation across industrial temperature ranges.
FAQ
What is the exact undervoltage threshold voltage for TL7733BCDR?
The TL7733BCDR has a nominal negative-going input threshold voltage (VIT–) of 3.08 V at 25°C, with a guaranteed range of 3.03 V (min) to 3.13 V (max) across 0°C to 70°C. This threshold is optimized for monitoring standard 3.3 V supply rails and includes 10 mV hysteresis to prevent oscillation during marginal voltage conditions. The value is specified in Section 6.5 of the official TI datasheet SLVS037O.
Does TL7733BCDR support manual reset override, and how is it implemented?
Yes, TL7733BCDR supports manual reset override via the RESIN pin (Pin 2). When RESIN is driven low, the device forces RESET high and RESET low regardless of SENSE voltage - enabling system-level reset initiation. When RESIN is high (≥2 V), normal voltage supervision resumes. This function is fully documented in the Pin Functions table and Figure 8-1 of the TL7733BCDR datasheet.
What package type and markings identify TL7733BCDR?
TL7733BCDR is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with RoHS-compliant NiPdAu lead finish and MSL Level-1 rating. The top-side marking is "7733BC", consistent across TI's orderable addendum. Tape-and-reel packaging contains 2500 units per reel, and the device is qualified for 0°C to 70°C operation.
How is the reset pulse duration set on TL7733BCDR, and what capacitor value yields ~2.6 ms?
The reset pulse duration on TL7733BCDR is set by an external capacitor connected to the CT pin (Pin 3), using the formula td ≈ 2.6 × 10⁴ × CT. For a 2.6 ms pulse, a 0.1 µF capacitor is recommended - matching TI's typical application guidance in Section 9.2.2. The timing capacitor must be placed close to the CT pin with short traces to minimize noise coupling and ensure predictable delay.
Why does TL7733BCDR require matched pullup/pulldown resistors on both RESET and RESET outputs?
TL7733BCDR requires matched termination (e.g., 10 kΩ pullup on RESET and 10 kΩ pulldown on RESET) to prevent waveform plateauing during switching - a condition that can cause undefined logic states and delayed or failed system resets. This requirement is explicitly stated in Sections 9.2.2 and 10 of the datasheet and arises from internal output stage interaction when only one output is actively driven.
TL7733BCDR 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:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 270ns Typical Propagation Delay
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7733BCDR FAQ
1.How can I place an order for TL7733BCDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7733BCDR 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 TL7733BCDR reliable?
The price and inventory of TL7733BCDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7733BCDR is usually 5 days.
3.What payment methods are accepted for TL7733BCDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7733BCDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7733BCDR?
TL7733BCDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7733BCDR 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 TL7733BCDR?
For technical support, including TL7733BCDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7733BCDR requirements.
6.How does Aetrix verify that TL7733BCDR is sourced from the original manufacturer or authorized distributors?
All TL7733BCDR 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 TL7733BCDR meets industry standards.
7.What is the process for return or replacement of TL7733BCDR?
All TL7733BCDR units undergo pre-shipment inspection (PSI). If there is an issue with TL7733BCDR, 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 TL7733BCDR part is unused and in its original packaging.
Return procedure for TL7733BCDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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