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Texas Instruments TL7702BIDR
- Part No.:
- TL7702BIDR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7702BIDR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,427
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Product details
Overview
TL7702BIDR from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microcomputer and microprocessor systems. It monitors the SENSE input for undervoltage conditions, provides true and complement reset outputs (RESET and RESET), features a 2.53 V ±25 mV temperature-compensated reference voltage, and supports adjustable reset pulse duration via external CT capacitor. It operates across –40°C to 85°C and is used in industrial embedded controllers requiring reliable power-on and brownout reset.
For engineers reviewing the TL7702BIDR datasheet, TL7702BIDR pinout, TL7702BIDR application, or TL7702BIDR equivalent, this page delivers verified functional identity, confirmed SOIC-8 package mapping, validated timing and threshold specifications, real-world implementation constraints (e.g., mandatory REF decoupling, CT resistor requirement), and two technically documented alternative parts with explicit differences in threshold voltage and temperature range.
Technical Context
The TL7702BIDR implements a dual-comparator architecture with precision voltage sensing at the SENSE input and an internal temperature-compensated 2.53 V reference driving the REF output. Its reset logic responds to both power-up (VCC ≥ 1 V) and dynamic undervoltage events, with active-high and active-low outputs driven by open-collector stages requiring external pullup/pulldown resistors.
Reset assertion timing is externally programmable via CT pin: td ≈ 2.6 × 10⁴ × CT (seconds), where CT is in farads. The device exhibits 10 mV hysteresis (VIT+ − VIT−) and guarantees defined RESET behavior down to VCC = 1 V, enabling robust operation during slow-ramp or noisy supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 2.53 V ±25 mV at 25°C; ensures accurate 2.5 V supply monitoring for 3.3 V systems |
| Hysteresis | 10 mV; prevents chatter during marginal voltage transitions near threshold |
| REF Output | 2.53 V ±25 mV, ±5% over –40°C to 85°C; stable reference for external comparator or ADC use |
| Operating Range | VCC = 3.6 V to 18 V; supports wide-input industrial and telecom power rails |
| Temp Range | –40°C to 85°C; qualified for extended-temperature industrial environments |
| Reset Pulse Delay | Externally set via CT capacitor; enables design-specific reset hold time (e.g., 0.1 µF → ~2.6 ms) |
| Output Type | Open-collector RESET and RESET; requires external pullup (RESET) and pulldown (RESET) resistors |
Pinout & Package
TL7702BIDR is housed in an SOIC-8 (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 | Provides stable 2.53 V reference; requires 0.1 µF bypass capacitor to GND to suppress noise-induced false triggers |
| 2 - RESIN | Reset input control | Active-low override: pulls RESET high and RESET low when asserted; disables automatic supervision |
| 3 - CT | Timing capacitor connection | Controls reset pulse duration; external capacitor sets delay (td ≈ 2.6×10⁴×CT); series resistor (≥560 Ω) required to prevent false triggering during fast VCC slew |
| 4 - GND | Ground reference | Primary return path for all internal circuitry and external decoupling capacitors |
| 5 - RESET | Active-low reset output | Open-collector output; must be pulled up to system VCC or logic rail; asserts low during undervoltage or power-up |
| 6 - RESET | Active-high reset output | Open-collector output; must be pulled down to GND; asserts high during undervoltage or power-up |
| 7 - SENSE | Supply voltage monitoring input | High-impedance input sensing system rail; triggers reset when voltage falls below 2.53 V threshold |
| 8 - VCC | Power supply input | Device supply rail (3.6–18 V); powers internal comparators, reference, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| True + 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, application-tailored reset hold time-critical for ensuring full microcontroller initialization before release |
| Precision Voltage Sensor | 2.53 V ±25 mV threshold with 10 mV hysteresis ensures repeatable, noise-immune detection of 2.5 V supply faults |
| RESET Defined Down to VCC = 1 V | Guarantees valid reset assertion even during very slow power ramps or deep brownouts, improving system reliability |
| Temperature-Compensated Reference | REF output maintains ±5% accuracy over –40°C to 85°C, enabling use as a stable bias source in analog circuits |
Applications
| Industrial PLC Controllers | Factory Automation Gateways |
|---|---|
Use Scenario: Monitoring 3.3 V I/O power rail in programmable logic controller backplane modules subject to voltage sags during motor switching. IC Role / Device Role / Timing Role: TL7702BIDR acts as primary undervoltage supervisor, asserting RESET to halt CPU execution and prevent corrupted register writes during rail collapse. Use Value: 2.53 V threshold precisely matches 3.3 V rail tolerance; 10 mV hysteresis avoids oscillation during transient dips; –40°C to 85°C rating ensures field reliability. | Use Scenario: Providing synchronized reset to ARM-based gateway SoC and companion FPGA in industrial Ethernet node with shared 5 V supply. IC Role / Device Role / Timing Role: TL7702BIDR generates matched-duration RESET and RESET pulses to coordinate cold start of heterogeneous processors without additional glue logic. Use Value: Dual open-collector outputs drive separate pullup/pulldown networks; REF pin supplies stable bias to FPGA configuration circuitry. |
| Building Management Systems | Networked HVAC Controllers |
Use Scenario: Supervising auxiliary 12 V DC power in smart thermostat hubs exposed to automotive-grade thermal cycling and EMI. IC Role / Device Role / Timing Role: TL7702BIDR monitors 12 V rail via resistive divider at SENSE; CT capacitor sets 100 ms reset pulse to ensure complete MCU boot sequence. Use Value: Wide 3.6–18 V VCC range accommodates unregulated 12 V inputs; MSL Level-1 packaging supports reflow assembly in high-volume production. | Use Scenario: Enabling fail-safe restart of Zigbee/Wi-Fi co-processor in HVAC zone controller after AC line interruption. IC Role / Device Role / Timing Role: TL7702BIDR's RESIN pin accepts manual reset signal from front-panel button while maintaining autonomous supervision of main 3.3 V rail. Use Value: RESIN override allows field service reset without power cycle; SOIC-8 footprint fits compact PCB layouts with minimal board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL7705BIDR | 4.55 V nominal threshold (vs. TL7702BIDR's 2.53 V); identical SOIC-8 package and –40°C to 85°C rating | Designed for 5 V system supervision instead of 3.3 V; not interchangeable without adjusting SENSE divider ratio | Select TL7705BIDR only when supervising 5 V rails; verify resistor divider scaling and timing capacitor recalibration |
| TPS3808G125DBVR | Fixed 1.25 V threshold, 200 ms factory-programmed delay, push-pull outputs (no external resistors needed), lower quiescent current (1.1 µA vs. 3 mA) | Lacks adjustable delay and dual reset outputs; optimized for ultra-low-power battery-backed systems, not industrial reset coordination | Choose TPS3808G125DBVR for space-constrained, low-ICC designs where fixed delay suffices; TL7702BIDR remains preferred for flexible timing and complementary signaling |
Compared with TL7705BIDR and TPS3808G125DBVR, the TL7702BIDR uniquely combines 2.5 V threshold accuracy, user-adjustable reset timing, true/complement outputs, and industrial temperature range in a standard SOIC-8-making it optimal for 3.3 V microcontroller supervision where timing flexibility and logic-level compatibility are critical.
Availability
TL7702BIDR is available at Aetrix Electronics and suitable for industrial PLC controllers, factory automation gateways, building management systems, and networked HVAC controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL7702BIDR 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 for industrial, automotive, and communications markets.
The TL77xxB family was engineered specifically for robust, precision supply-voltage supervision in microprocessor-based systems-emphasizing threshold accuracy, noise immunity, and configurable reset timing over wide operating temperatures.
FAQ
What is the exact reset threshold voltage of the TL7702BIDR, and how does it vary with temperature?
The TL7702BIDR has a nominal negative-going input threshold voltage (VIT−) of 2.53 V at 25°C, with a guaranteed range of 2.48 V to 2.58 V across the full –40°C to 85°C operating temperature range. This specification is explicitly confirmed in Section 6.5 of the official TI datasheet SLVS037O, and the 10 mV hysteresis (VHYS) remains stable across temperature, ensuring consistent trip-point behavior in industrial thermal environments.
Does the TL7702BIDR require external components to function, and if so, which ones are mandatory?
Yes, the TL7702BIDR requires three mandatory external components: a 0.1 µF capacitor from REF to GND (to stabilize the reference and prevent false triggering), an external timing capacitor (CT) to set reset pulse duration, and a series resistor (≥560 Ω) between CT and VCC to avoid false resets during rapid VCC slew. Additionally, pullup and pulldown resistors are required on RESET and RESET outputs respectively, as both are open-collector.
Can the TL7702BIDR be used to supervise a 5 V supply, or is it limited to 3.3 V systems?
The TL7702BIDR is specifically optimized for 2.5 V threshold detection and is not intended for direct 5 V supervision. To monitor a 5 V rail, a precision resistive divider must be used at the SENSE input to scale the voltage down to ~2.53 V. For native 5 V supervision, TI recommends the TL7705BIDR, which has a 4.55 V threshold and identical package and temperature rating-making it a functionally aligned but electrically distinct alternative.
What is the purpose of the RESIN pin on the TL7702BIDR, and how should it be used in a typical design?
The RESIN pin on the TL7702BIDR is an active-low reset override input. When pulled low, it forces RESET high and RESET low regardless of SENSE voltage-effectively disabling automatic supervision and providing a manual or system-initiated reset signal. In typical designs, RESIN connects to a front-panel pushbutton (with pullup) or a watchdog timer output, enabling coordinated system reset independent of supply conditions.
How does the TL7702BIDR's reset pulse duration get calculated, and what is the recommended CT value for a 2.6 ms delay?
The TL7702BIDR's reset pulse duration (td) is calculated using td ≈ 2.6 × 10⁴ × CT, where CT is in farads and td in seconds. For a 2.6 ms delay, solve: 0.0026 = 2.6 × 10⁴ × CT → CT = 0.1 µF. This value is explicitly recommended in TI's Application Report SLVA671 and validated in Figure 9-1 of the TL7702BIDR datasheet for microcontroller reset timing compliance.
TL7702BIDR 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:
- 2.53V
- 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
TL7702BIDR FAQ
1.How can I place an order for TL7702BIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7702BIDR 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 TL7702BIDR reliable?
The price and inventory of TL7702BIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7702BIDR is usually 5 days.
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TL7702BIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7702BIDR 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 TL7702BIDR?
For technical support, including TL7702BIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7702BIDR requirements.
6.How does Aetrix verify that TL7702BIDR is sourced from the original manufacturer or authorized distributors?
All TL7702BIDR 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 TL7702BIDR meets industry standards.
7.What is the process for return or replacement of TL7702BIDR?
All TL7702BIDR units undergo pre-shipment inspection (PSI). If there is an issue with TL7702BIDR, 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 TL7702BIDR part is unused and in its original packaging.
Return procedure for TL7702BIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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