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Texas Instruments TL7702BCD
- Part No.:
- TL7702BCD
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7702BCD.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:883
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Product details
Overview
TL7702BCD from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microcomputer systems. It monitors the SENSE input for undervoltage conditions, provides true and complement reset outputs (RESET/RESET), features a 2.53 V ±25 mV temperature-compensated reference voltage (REF), supports 3.6–18 V supply range, and delivers adjustable reset pulse duration via external CT capacitor. It is used in industrial control and embedded computing where reliable power-on and brownout reset is required.
For engineers reviewing the TL7702BCD datasheet, TL7702BCD pinout, TL7702BCD application, or TL7702BCD equivalent, key selection considerations include its 2.53 V threshold accuracy, dual active-high/active-low reset outputs, SOIC-8 package compatibility, and operation across 0°C to 70°C ambient temperature.
Technical Context
The TL7702BCD implements a precision bandgap-based voltage reference and comparator architecture to detect undervoltage at the SENSE pin with 2.53 V nominal trip point and 10 mV hysteresis. Its internal timing capacitor (CT) interface enables user-defined reset pulse width (td ≈ 2.6×10⁴ × CT), while RESIN allows external reset assertion independent of supply monitoring.
It delivers complementary open-collector RESET and RESET outputs capable of sinking 20 mA each, operates with VCC ≥ 1 V for defined reset behavior, and maintains stable REF output (2.53 V ±0.05 V) over temperature and load - all within a single SOIC-8 package rated for commercial temperature range (0°C to 70°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.6 V to 18 V - supports wide-input industrial and legacy 5 V/12 V systems without external regulation |
| SENSE Threshold (VIT−) | 2.53 V ±25 mV - precise undervoltage detection point for 3.3 V rail supervision |
| Hysteresis | 10 mV - prevents chatter during slow-rising/falling supply transitions |
| Reference Output (REF) | 2.53 V ±0.05 V at −500 µA - stable internal reference usable for external comparator biasing |
| Reset Output Drive | 20 mA sink per output - sufficient to drive standard logic inputs and pull-up networks directly |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded applications including networking and computing |
| Package | SOIC-8 (4.90 mm × 3.91 mm) - surface-mount compatible with standard PCB assembly processes |
Pinout & Package
TL7702BCD is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 4.90 mm × 3.91 mm body size, and RoHS-compliant NiPdAu lead finish. Thermal resistance RθJA = 109.2°C/W enables operation up to 70°C ambient with moderate power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference voltage output | Provides stable 2.53 V reference for external circuitry; requires 0.1 µF bypass capacitor to GND |
| 2 (RESIN) | Reset input | Active-low external override: forces RESET high / RESET low when pulled low, independent of SENSE |
| 3 (CT) | Timing capacitor connection | Controls reset pulse duration (td ≈ 26 ms per µF); sets delay after SENSE recovers above threshold |
| 4 (GND) | Ground reference | Primary return path for all internal circuits and output sinks; must be low-impedance |
| 5 (RESET) | Active-low reset output | Open-collector output; requires external pull-up; asserts low during undervoltage or RESIN activation |
| 6 (RESET) | Active-high reset output | Open-collector output; requires external pull-down; asserts high during undervoltage or RESIN activation |
| 7 (SENSE) | Supply voltage monitor input | Monitors external rail (e.g., 3.3 V) for drop below 2.53 V; internally compared against precision reference |
| 8 (VCC) | Power supply input | Primary IC supply; powers internal circuitry; RESET defined down to VCC ≥ 1 V |
Key Features
| Feature | Design Value |
|---|---|
| True and complement reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Externally adjustable pulse duration | CT pin enables precise, user-configurable reset hold time (e.g., 2.6 ms with 0.1 µF) to meet processor reset timing requirements |
| Precision voltage sensor | 2.53 V ±25 mV threshold with 10 mV hysteresis ensures accurate 3.3 V rail supervision without calibration |
| Temperature-compensated reference | REF output remains stable across 0°C–70°C, enabling use as a system-level reference for ADCs or comparators |
| Power-on reset generation | Guarantees valid reset assertion at VCC ≥ 1 V, ensuring microcontroller initialization before functional operation begins |
Applications
| Industrial PLC Control | Network Router Power Management |
|---|---|
Use Scenario: Supervises 3.3 V I/O rail in programmable logic controller modules subject to intermittent brownouts. IC Role / Device Role / Timing Role: Reset controller asserting both RESET and RESET outputs to hold CPU and FPGA in reset until stable 3.3 V is confirmed. Use Value: Prevents corrupted firmware execution during partial power recovery by enforcing minimum 2.6 ms reset pulse via 0.1 µF CT capacitor. |
Use Scenario: Monitors 5 V switching supply feeding Ethernet PHY and packet processor in enterprise routers. IC Role / Device Role / Timing Role: Dual-output supervisor providing active-low reset to ARM core and active-high enable to power sequencer. Use Value: Eliminates external logic inversion; REF pin supplies stable bias to auxiliary voltage monitor circuit. |
| Embedded Medical Data Logger | Factory Automation HMI Panel |
Use Scenario: Ensures clean boot sequence for ARM Cortex-M4 MCU in battery-backed data acquisition unit. IC Role / Device Role / Timing Role: Primary reset source triggered by SENSE monitoring regulated 3.3 V rail; RESIN tied high for autonomous operation. Use Value: 2.53 V threshold matches 3.3 V LDO dropout margin; 10 mV hysteresis avoids false resets during transient load spikes. |
Use Scenario: Controls reset timing for display controller and touch interface ASIC in industrial human-machine interface. IC Role / Device Role / Timing Role: Supervisor with externally adjustable CT delay synchronizing reset release across multiple subsystems. Use Value: Configurable pulse width accommodates varying power-up sequencing delays between LCD driver and microcontroller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G01DBVR | Fixed 1.0 ms reset delay; no CT adjustment; 3-pin SOT-23 package; lower quiescent current (1.1 µA) | Lacks dual reset outputs and REF pin; suited for space-constrained, low-power designs without timing flexibility | Choose for ultra-low-power battery applications where fixed delay suffices and board area is critical |
| MAX6816EUS+T | Single active-low reset output; push-pull (not open-collector); includes debounce circuitry for noisy environments | No complement output or reference voltage; optimized for mechanical switch debouncing + reset, not rail supervision | Prefer when integrating manual reset button debouncing with reset generation, not precision voltage monitoring |
Compared with TPS3808G01DBVR and MAX6816EUS+T, TL7702BCD uniquely combines adjustable reset timing, dual complementary outputs, and a buffered reference voltage - making it optimal for multi-rail embedded systems requiring design flexibility and signal-level interoperability.
Availability
TL7702BCD is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, and embedded computing applications requiring stable component supply, long-term lifecycle support, and commercial-temperature-grade reliability.
Supply support for TL7702BCD 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 and embedded processing solutions, with decades of expertise in power management, signal chain, and timing products.
The TL77xxB family was engineered specifically for robust, precision supply-voltage supervision in microprocessor-based systems - emphasizing threshold accuracy, noise immunity, and flexible reset timing across industrial and computing environments.
FAQ
What is the exact undervoltage threshold voltage of TL7702BCD?
The TL7702BCD has a nominal negative-going input threshold voltage (VIT−) of 2.53 V at 25°C, with a guaranteed range of 2.505 V to 2.555 V across temperature and process variation. This value is specified for the TL7702B variant and applies directly to TL7702BCD, which is the commercial-temperature SOIC-8 version of that device.
Does TL7702BCD provide both active-high and active-low reset outputs?
Yes, TL7702BCD provides true and complement reset outputs: pin 6 (RESET) is active-high and pin 5 (RESET) is active-low. Both are open-collector outputs requiring external pull-up (for RESET) or pull-down (for RESET) resistors, enabling direct interface with mixed-logic systems without additional level-shifting components.
How is the reset pulse duration set on TL7702BCD?
The reset pulse duration on TL7702BCD is set externally via capacitor CT connected to pin 3. The delay time follows td ≈ 2.6 × 10⁴ × CT (with CT in farads and td in seconds). For example, a 0.1 µF capacitor yields approximately 2.6 ms delay - a common value meeting most microcontroller reset timing requirements.
What is the function of the REF pin on TL7702BCD?
The REF pin (pin 1) on TL7702BCD delivers a precision 2.53 V ±0.05 V reference voltage, derived from an internal temperature-compensated bandgap circuit. It can be used to bias external comparators or ADC references, but requires a 0.1 µF bypass capacitor to GND for stability and noise rejection.
Is TL7702BCD compatible with 3.3 V supply rails?
Yes, TL7702BCD is fully compatible with 3.3 V systems: its 2.53 V SENSE threshold is intentionally selected to supervise 3.3 V rails with adequate margin, and its 3.6 V minimum VCC rating is satisfied when powered from a regulated 3.3 V supply with typical tolerance and ripple - provided VCC remains ≥3.6 V (e.g., via dedicated 5 V bias or local LDO).
TL7702BCD 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:
- 2.53V
- 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
TL7702BCD FAQ
1.How can I place an order for TL7702BCD through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7702BCD 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 TL7702BCD reliable?
The price and inventory of TL7702BCD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7702BCD is usually 5 days.
3.What payment methods are accepted for TL7702BCD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7702BCD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7702BCD?
TL7702BCD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7702BCD 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 TL7702BCD?
For technical support, including TL7702BCD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7702BCD requirements.
6.How does Aetrix verify that TL7702BCD is sourced from the original manufacturer or authorized distributors?
All TL7702BCD 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 TL7702BCD meets industry standards.
7.What is the process for return or replacement of TL7702BCD?
All TL7702BCD units undergo pre-shipment inspection (PSI). If there is an issue with TL7702BCD, 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 TL7702BCD part is unused and in its original packaging.
Return procedure for TL7702BCD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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