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Texas Instruments TL7702BCDRG4
- Part No.:
- TL7702BCDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7702BCDRG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,823
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Product details
Overview
TL7702BCDRG4 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 and RESET), features an externally adjustable reset pulse duration via CT capacitor, and operates across 3.6 V to 18 V supply range with 2.53 V ±25 mV threshold voltage at 25°C.
For engineers reviewing the TL7702BCDRG4 datasheet, TL7702BCDRG4 pinout, TL7702BCDRG4 application, or TL7702BCDRG4 equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, thermal performance data, and validated alternative options for industrial and computing power-supply monitoring designs.
Technical Context
The TL7702BCDRG4 implements a precision bandgap-based voltage reference and comparator architecture to detect supply drops at the SENSE input. Its negative-going threshold is 2.53 V ±25 mV (25°C), with 10 mV hysteresis, and it guarantees defined RESET output behavior down to VCC ≥ 1 V.
Reset pulse duration is programmable via external CT capacitor (td ≈ 2.6 × 10⁴ × CT seconds), and both open-collector RESET/RESET outputs require matched pullup/pulldown resistors to prevent waveform plateauing-critical for reliable microcontroller reset assertion in servers and automation systems.
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 slow-rising/falling supply transitions. |
| Supply Range | 3.6 V to 18 V; supports wide-input industrial and telecom power rails. |
| RESET Output Type | Open-collector active-high; requires external pullup for logic-level compatibility. |
| RESET Output Type | Open-collector active-low; enables direct interface with MCU reset pins needing low-active assertion. |
| Reference Voltage | 2.53 V ±0.05 V at REF pin; stable internal reference for precision sensing and calibration. |
| Operating Temp | 0°C to 70°C (C-suffix); suitable for commercial-grade embedded computing and office equipment. |
Pinout & Package
TL7702BCDRG4 is housed in an SOIC-8 package (4.90 mm × 3.91 mm body size) with standard JEDEC MS-012AC footprint and RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference voltage output | Provides stable 2.53 V reference; requires 0.1 µF bypass capacitor to suppress noise-induced false triggers. |
| 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 | Determines reset pulse width (td ≈ 2.6×10⁴×CT s); capacitor charges from internal current source (~1.2 µA). |
| 4 - GND | Ground reference | Common return path for all internal circuitry; must be low-impedance for accurate threshold detection. |
| 5 - RESET | Active-low reset output | Open-collector output; sinks up to 20 mA; requires external pulldown or pullup depending on host MCU requirement. |
| 6 - RESET | Active-high reset output | Open-collector output; sources up to 16 mA when pulled up; complements RESET for dual-signaling flexibility. |
| 7 - SENSE | Supply voltage monitoring input | High-impedance input (±0.1 µA leakage); connects directly to regulated rail or via resistor divider for higher-voltage supervision. |
| 8 - VCC | Power supply input | Accepts 3.6–18 V; powers internal reference, comparator, and output drivers; defines operating voltage window. |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage sensor | 2.53 V ±25 mV threshold with 10 mV hysteresis enables reliable 2.5 V rail monitoring without external trimming. |
| 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 allows user-defined reset hold time (e.g., 0.1 µF → ~2.6 ms), ensuring full system initialization before release. |
| RESET output defined from VCC ≥ 1 V | Guarantees valid reset assertion during brownout and power-up sequences where VCC falls below 3 V. |
| Temperature-compensated reference | Bandgap-derived 2.53 V reference maintains ±0.05 V stability over 0°C–70°C, critical for consistent trip points. |
Applications
| Industrial PLC Controllers | Network Switch Power Management |
|---|---|
Use Scenario: Monitors 3.3 V I/O supply in programmable logic controllers subjected to factory EMI and transient load switching. IC Role / Device Role / Timing Role: Supervises SENSE-connected rail and asserts synchronized RESET/RESET pulses to halt CPU execution until stable voltage resumes. Use Value: Prevents firmware corruption during undervoltage events by guaranteeing minimum 2.6 ms reset pulse width via 0.1 µF CT capacitor. |
Use Scenario: Embedded in 12 V–48 V PoE-powered Ethernet switches to supervise auxiliary 3.3 V management rail. IC Role / Device Role / Timing Role: Acts as primary reset controller for ARM-based management MCU; RESIN pin enables remote reset via baseboard controller. Use Value: Dual open-collector outputs interface directly with both 3.3 V and 1.8 V logic families without level shifters. |
| Notebook System Power Sequencing | Building Automation Gateway |
Use Scenario: Integrated into notebook motherboard power tree to monitor core 5 V standby rail during sleep/wake transitions. IC Role / Device Role / Timing Role: Generates clean, chatter-free reset using internal hysteresis and REF-decoupled reference to avoid false triggers from rail ripple. Use Value: 10 mV hysteresis and 2.53 V threshold ensure deterministic reset release after VCC crosses 2.555 V on power-up. |
Use Scenario: Used in HVAC gateway controllers powered from 24 V AC/DC supplies to supervise isolated 3.3 V microcontroller domain. IC Role / Device Role / Timing Role: SENSE input connected via resistor divider to 24 V rail; REF pin stabilizes sensing accuracy against temperature drift. Use Value: Temperature-compensated 2.53 V reference maintains ±0.05 V tolerance from 0°C to 70°C, ensuring field reliability across seasonal ambient shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL7705BCDR | 4.55 V nominal threshold (vs. TL7702BCDRG4's 2.53 V); identical SOIC-8 package and pinout. | Designed for 5 V system supervision instead of 3.3 V; not interchangeable without circuit redesign. | Select TL7705BCDR only when supervising 5 V rails; verify SENSE divider ratio and timing capacitor value. |
| TPS3808G33DBVR | Fixed 3.3 V threshold, 200 ms factory-programmed delay, lower quiescent current (1.8 µA vs. 3 mA), SOT-23-6 package. | Lacks complement output and adjustable delay; suited for space-constrained, low-power applications where fixed timing suffices. | Choose TPS3808G33DBVR for battery-backed or ultra-low-power designs; TL7702BCDRG4 remains preferred for flexible timing and dual-output needs. |
Compared with TL7705BCDR and TPS3808G33DBVR, the TL7702BCDRG4 uniquely combines 2.53 V precision threshold, user-adjustable reset duration, and true/complement outputs in SOIC-8-making it optimal for 3.3 V microcontroller reset control where timing flexibility and noise immunity are critical.
Availability
TL7702BCDRG4 is available at Aetrix Electronics and suitable for industrial PLC controllers, network switch power management, notebook system power sequencing, and building automation gateways requiring stable component supply and long-term production continuity.
Supply support for TL7702BCDRG4 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, precision, and industrial-grade performance.
The TL77xxB product line was engineered specifically for robust supply-voltage supervision in microcomputer and microprocessor systems-targeting applications demanding precise undervoltage detection, configurable reset timing, and fail-safe reset assertion under brownout conditions.
FAQ
What is the exact reset threshold voltage of the TL7702BCDRG4?
The TL7702BCDRG4 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 at 25°C and 2.48 V to 2.58 V across its full 0°C to 70°C operating range. This precision enables reliable supervision of 3.3 V supply rails with adequate margin.
Does the TL7702BCDRG4 require external components to function?
Yes-the TL7702BCDRG4 requires three external components for basic operation: a 0.1 µF capacitor on the REF pin to stabilize the internal reference, a timing capacitor on the CT pin to set reset pulse duration, and matched pullup/pulldown resistors on RESET and RESET outputs due to their open-collector configuration. Omitting any compromises noise immunity or reset timing accuracy.
Can the TL7702BCDRG4 monitor voltages higher than its VCC supply?
Yes-the SENSE input accepts voltages up to 18 V regardless of VCC, enabling direct monitoring of higher rails (e.g., 12 V or 24 V) via a resistor divider. The TL7702BCDRG4's high-impedance SENSE input draws less than 0.2 µA, minimizing divider loading error and preserving accuracy.
What is the purpose of the RESIN pin on the TL7702BCDRG4?
The RESIN pin on the TL7702BCDRG4 provides an active-low hardware reset override: when pulled low, it forces RESET high and RESET low independently of the SENSE voltage. This enables external system-level reset initiation (e.g., front-panel button or watchdog timeout) while retaining undervoltage supervision functionality.
Is the TL7702BCDRG4 pin-compatible with other TL77xxB variants?
Yes-the TL7702BCDRG4 shares identical SOIC-8 pinout and electrical behavior with TL7705BCDR and TL7733BCDR, differing only in threshold voltage (2.53 V, 4.55 V, and 3.08 V respectively). Pin compatibility allows drop-in replacement within the same family when threshold requirements align with the target supply rail.
TL7702BCDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
TL7702BCDRG4 FAQ
1.How can I place an order for TL7702BCDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7702BCDRG4 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 TL7702BCDRG4 reliable?
The price and inventory of TL7702BCDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7702BCDRG4 is usually 5 days.
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TL7702BCDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7702BCDRG4 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 TL7702BCDRG4?
For technical support, including TL7702BCDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7702BCDRG4 requirements.
6.How does Aetrix verify that TL7702BCDRG4 is sourced from the original manufacturer or authorized distributors?
All TL7702BCDRG4 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 TL7702BCDRG4 meets industry standards.
7.What is the process for return or replacement of TL7702BCDRG4?
All TL7702BCDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL7702BCDRG4, 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 TL7702BCDRG4 part is unused and in its original packaging.
Return procedure for TL7702BCDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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