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Texas Instruments TL7733BID
- Part No.:
- TL7733BID
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7733BID.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:267
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Product details
Overview
TL7733BID 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 an externally adjustable reset pulse duration via CT capacitor, and delivers a 2.53 V reference voltage at REF. It operates over 3.6 V to 18 V supply and supports industrial temperature range (–40°C to 85°C) in SOIC-8 package.
For engineers reviewing the TL7733BID datasheet, TL7733BID pinout, TL7733BID application, or TL7733BID equivalent, this page delivers verified electrical characteristics, functional timing behavior, thermal metrics, and real-world implementation guidance - including CT-based delay calculation (td ≈ 2.6×10⁴ × CT), open-collector output termination requirements, and RESIN-controlled reset override functionality.
Technical Context
The TL7733BID integrates a precision voltage sensor with temperature-compensated reference (2.53 V typ), dual comparators for threshold detection (VIT– = 3.08 V typ), and internal current source for CT-based timing. Its SENSE input detects supply drops below 3.08 V, while RESIN enables external reset assertion independent of supply level.
It delivers active-high RESET and active-low RESET outputs with defined behavior down to VCC ≥ 1 V, supports open-collector interfacing with pullup/pulldown resistors (recommended 10 kΩ), and requires a 0.1 µF capacitor on REF to suppress transients. The device uses a trimmed comparator architecture to achieve ±10 mV hysteresis (VHYS = 10 mV) and maintains reset assertion for user-defined duration after recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT– Threshold | 3.08 V (typical negative-going trip point at SENSE; ensures reliable reset activation when monitored supply falls below 3.08 V) |
| VHYS Hysteresis | 10 mV (prevents chatter during slow supply recovery; output remains asserted until SENSE rises to 3.09 V) |
| VREF Output | 2.53 V (typical stable reference at REF pin; used for external comparator bias or calibration) |
| Supply Range | 3.6 V to 18 V (supports wide-input industrial and telecom power rails without external regulation) |
| Operating Temp | –40°C to 85°C (qualified for extended industrial environments; marked 'I' suffix) |
| Reset Pulse Delay | Adjustable via CT (td ≈ 2.6×10⁴ × CT seconds; e.g., 0.1 µF yields ~2.6 ms delay) |
| Output Drive | ±16 mA (IOH/IOL at RESET/RESET; supports direct interface to TTL/CMOS inputs with proper termination) |
Pinout & Package
TL7733BID is housed in an SOIC-8 (D) package measuring 4.90 mm × 3.91 mm, with standard 1.27 mm lead pitch and RoHS-compliant NiPdAu finish (MSL Level-2, 260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference voltage output | Provides 2.53 V precision reference; requires 0.1 µF bypass capacitor to GND for noise immunity |
| 2 (RESIN) | Reset input control | Active-low override: pulls RESET high and RESET low when asserted, independent of SENSE voltage |
| 3 (CT) | Timing capacitor connection | Controls reset pulse duration; internal current source charges external capacitor to set td ≈ 2.6×10⁴ × CT |
| 4 (GND) | Ground reference | Primary return path for all internal circuitry and output sinks; must be low-impedance |
| 5 (RESET) | Active-low reset output | Open-collector output; requires external pullup resistor (e.g., 10 kΩ) to system VCC or logic rail |
| 6 (RESET) | Active-high reset output | Open-collector output; requires external pulldown resistor (e.g., 10 kΩ) to ensure clean low-state when inactive |
| 7 (SENSE) | Supply voltage monitoring input | High-impedance input sensing external rail; triggers reset when voltage falls below 3.08 V (VIT–) |
| 8 (VCC) | Power supply input | Device operating supply; powers internal circuitry and defines operating range (3.6–18 V) |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable reset pulse duration | Enables precise reset hold time tuning (e.g., 2.6 ms with 0.1 µF CT) to match processor reset timing requirements |
| True and complement reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Precision voltage sensor with temp compensation | Maintains ±0.05 V accuracy over –40°C to 85°C, ensuring consistent reset threshold across industrial temperature range |
| RESET output defined from VCC ≥ 1 V | Guarantees valid reset assertion during brown-out and power-up sequences where supply may dip near 1 V |
| Power-on reset generator | Automatically asserts reset at power-up when VCC reaches ~1 V, then releases after CT delay once SENSE exceeds VIT+ |
Applications
| Wireless Base Station Power Monitoring | Industrial PLC Controller Reset |
|---|---|
Use Scenario: Monitors +5 V and +3.3 V rails in LTE/5G remote radio units subject to transient load drops and thermal cycling. IC Role / Device Role / Timing Role: TL7733BID acts as primary undervoltage supervisor, asserting RESET to halt FPGA configuration and prevent corrupted state during rail collapse. Use Value: 3.08 V threshold matches 3.3 V rail tolerance; 10 mV hysteresis prevents false resets during ripple; CT-adjustable delay ensures full FPGA initialization before release. |
Use Scenario: Embedded controller in programmable logic controller (PLC) rack requiring deterministic restart after AC line sags or backup battery switchover. IC Role / Device Role / Timing Role: TL7733BID serves as fail-safe reset arbiter, using RESIN to synchronize with watchdog timeout and SENSE to monitor 24 V DC input. Use Value: RESIN override allows coordinated reset with safety logic; –40°C to 85°C rating ensures operation in unconditioned cabinet environments; REF output calibrates auxiliary analog monitoring circuits. |
| Server Board Management Controller (BMC) | Factory Automation I/O Module |
Use Scenario: Supervises standby +3.3 VSB and main +12 V rails on server motherboard BMC, interfacing with IPMI firmware. IC Role / Device Role / Timing Role: TL7733BID generates hardware reset signal to BMC microcontroller upon detected undervoltage, with RESET tied to processor reset pin. Use Value: Dual reset outputs simplify interface to both BMC and platform controller hub; 18 V max VCC accommodates legacy 12 V rail tolerances; SOIC-8 footprint fits dense server PCB layouts. |
Use Scenario: Distributed I/O module in automotive test cell with variable 12–24 V DC input and EMI-prone factory floor environment. IC Role / Device Role / Timing Role: TL7733BID supervises local 5 V regulator output, asserting RESET to ARM Cortex-M4 core when input dips below 3.08 V due to cable drop or switching noise. Use Value: 0.1 µF REF capacitor rejects fast transients; CT timing eliminates race conditions between power rail recovery and firmware boot sequence; industrial temp grade ensures reliability under thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V threshold, no REF output, push-pull RESET, 1.8–6 V supply range | Lacks adjustable delay and reference voltage; suited for simpler 3.3 V-only systems without RESIN control | Choose TPS3808G33DBVR only if adjustable CT delay and REF output are unnecessary and supply is strictly ≤6 V. |
| MAX6326LT33D3+T | 3.3 V threshold, fixed 200 ms reset timeout, no RESIN input, ±1.5% threshold accuracy | No external timing adjustment or override capability; higher threshold tolerance than TL7733BID's ±0.05 V | Select MAX6326LT33D3+T when fixed long-duration reset is acceptable and RESIN coordination is not required. |
Compared with TPS3808G33DBVR and MAX6326LT33D3+T, TL7733BID uniquely combines adjustable reset timing, dual reset polarity, RESIN override, and a precision reference output - making it optimal for complex embedded systems requiring flexible, coordinated power management.
Availability
TL7733BID is available at Aetrix Electronics and suitable for wireless infrastructure, industrial automation, and server board management applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL7733BID 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 power management technologies, with decades of experience in high-reliability industrial and automotive ICs.
The TL77xxB family was engineered specifically for robust reset control in microprocessor-based systems, emphasizing precision threshold stability, flexible timing, and fault-resilient operation in harsh electrical environments.
FAQ
What is the exact reset threshold voltage for TL7733BID?
The TL7733BID has a nominal negative-going input threshold (VIT–) of 3.08 V at 25°C, with a full-range specification of 3.00 V to 3.16 V across –40°C to 85°C. This threshold applies to the SENSE pin and triggers reset assertion when the monitored supply falls below this value. The device also provides 10 mV of built-in hysteresis to prevent oscillation during slow supply recovery.
How do I calculate the reset pulse duration for TL7733BID?
The reset pulse duration for TL7733BID is determined by the external capacitor connected to the CT pin using the formula td ≈ 2.6 × 10⁴ × CT, where CT is in farads and td is in seconds. For example, a 0.1 µF capacitor yields approximately 2.6 ms. Note that the internal current source varies ±15%, so actual delay may deviate slightly; design margin should account for this variation.
Does TL7733BID require external pullup/pulldown resistors on its reset outputs?
Yes, TL7733BID requires external termination: RESET (pin 5) is open-collector and needs a pullup resistor (e.g., 10 kΩ to system VCC), while RESET (pin 6) is also open-collector and requires a pulldown resistor (e.g., 10 kΩ to GND). Both outputs must use similar-value resistors even if only one is used, to prevent waveform plateauing that could cause undefined logic states.
Can TL7733BID operate with a 3.3 V supply rail?
No - TL7733BID requires a minimum supply voltage of 3.6 V per its Recommended Operating Conditions. While it supervises 3.3 V rails via the SENSE pin, its own VCC must be ≥3.6 V (up to 18 V). For 3.3 V-only systems, consider alternatives like TPS3808G33DBVR, but note TL7733BID's unique RESIN control and REF output are unavailable there.
What is the function of the RESIN pin on TL7733BID?
The RESIN pin (pin 2) is an active-low reset override input. When pulled low, it forces RESET high and RESET low regardless of SENSE voltage - enabling external reset coordination (e.g., from a watchdog timer or manual switch). When RESIN is high, TL7733BID resumes autonomous supervision of the SENSE input for undervoltage detection.
TL7733BID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7733BID FAQ
1.How can I place an order for TL7733BID through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7733BID 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 TL7733BID reliable?
The price and inventory of TL7733BID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7733BID is usually 5 days.
3.What payment methods are accepted for TL7733BID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7733BID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7733BID?
TL7733BID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7733BID 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 TL7733BID?
For technical support, including TL7733BID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7733BID requirements.
6.How does Aetrix verify that TL7733BID is sourced from the original manufacturer or authorized distributors?
All TL7733BID 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 TL7733BID meets industry standards.
7.What is the process for return or replacement of TL7733BID?
All TL7733BID units undergo pre-shipment inspection (PSI). If there is an issue with TL7733BID, 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 TL7733BID part is unused and in its original packaging.
Return procedure for TL7733BID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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