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Texas Instruments TL7702AIDR
- Part No.:
- TL7702AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7702AIDR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,871
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Product details
Overview
TL7702AIDR from Texas Instruments is a precision supply-voltage supervisor IC designed for reset control in microprocessor and embedded systems. It features a 2.53 V ±50 mV threshold voltage (VIT−), operates from 3.5 V to 18 V supply, delivers dual active-high/active-low reset outputs (RESET/RESET), supports externally adjustable reset pulse duration via CT pin, and is qualified for industrial temperature range (–40°C to +85°C) in SOIC-8 package.
For engineers reviewing the TL7702AIDR datasheet, TL7702AIDR pinout, TL7702AIDR application, or TL7702AIDR equivalent, this page provides verified functional specifications, validated pin functions, confirmed industrial-grade operating conditions, and real-world implementation context for reliable power-on and undervoltage reset generation in resource-constrained embedded designs.
Technical Context
The TL7702AIDR implements a precision bandgap-referenced comparator with hysteresis (10 mV typical) to monitor the SENSE input against a trimmed 2.53 V threshold. Its internal delay timer-controlled by an external capacitor on the CT pin-generates a reset pulse with duration calculable as td = 1.3 × 10⁴ × CT (seconds), enabling design flexibility across timing requirements.
It integrates a stable 2.53 V reference output (REF) with <±10 mV supply variation and <±16 mV over –40°C to +85°C, usable as a system reference source. The device uses open-collector RESET and RESET outputs, requiring external pull-up resistors, and maintains defined reset states during power-up until VCC exceeds ~3.6 V and SENSE rises above VIT+.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.5 V to 18 V - supports wide-input industrial and mixed-rail systems without external regulation |
| Threshold Voltage (VIT−) | 2.48 V to 2.58 V at 25°C - precise 2.53 V nominal trip point for 2.5 V–3.3 V rail monitoring |
| Hysteresis | 10 mV typical - prevents chatter during slow-rising/falling supply transitions |
| Reference Output (REF) | 2.48–2.58 V, ±16 mV over full temp - stable, temperature-compensated voltage source usable for ADC references or biasing |
| Reset Pulse Duration | 0.65–2.6 ms with 0.1 µF CT - externally programmable delay ensures sufficient processor initialization time |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Output Type | Open-collector RESET and RESET - enables wired-OR reset bus and flexible logic-level interfacing |
Pinout & Package
TL7702AIDR 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 |
|---|---|---|
| REF (Pin 1) | Voltage reference output | Provides stable 2.53 V reference; requires 0.1 µF bypass capacitor to GND for noise immunity |
| RESIN (Pin 2) | Manual reset input | Active-low asynchronous reset trigger; accepts TTL/CMOS-compatible logic levels (VIL ≤ 0.6 V, VIH ≥ 2 V) |
| CT (Pin 3) | Timing capacitor connection | Sets reset pulse duration (td = 1.3×10⁴ × CT); must be connected to GND via external capacitor |
| GND (Pin 4) | Ground reference | Analog and digital ground return; critical for REF, CT, and SENSE noise integrity |
| RESET (Pin 5) | Inverted reset output | Active-low open-collector output; requires external pull-up for high-state assertion |
| RESET (Pin 6) | Non-inverted reset output | Active-high open-collector output; requires external pull-up for high-state assertion |
| SENSE (Pin 7) | Supply monitoring input | Monitors external rail (e.g., 2.5 V, 3.3 V); max input 6 V or VCC–1 V, whichever is lower |
| VCC (Pin 8) | Power supply input | Primary device supply; powers internal circuitry and enables operation above 3.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable reset pulse duration | Enables precise timing control (0.65–2.6 ms typical) using standard 0.1 µF ceramic capacitor - eliminates need for fixed-delay ICs or RC networks |
| Temperature-compensated 2.53 V reference | Stable ±16 mV over –40°C to +85°C - usable as system-level analog reference without additional regulators or buffers |
| Dual complementary reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals - simplifies interface to diverse MCU reset inputs (e.g., ARM nRESET vs. x86 RESET#) |
| Wide 3.5–18 V supply range | Operates directly from unregulated 5 V, 12 V, or 15 V rails - avoids dedicated LDO for supervisor power |
| 10 mV hysteresis on SENSE input | Prevents false resets during brown-out recovery with minimal voltage margin - improves system robustness without external hysteresis circuitry |
Applications
| Industrial PLC Controller | Medical Diagnostic Handheld |
|---|---|
|
Use Scenario: Power sequencing and fault recovery in compact, battery-backed PLC modules with 3.3 V I/O and 5 V logic rails. IC Role / Device Role / Timing Role: Monitors 3.3 V supply via resistor divider on SENSE; asserts RESET/RESET for 1.3 ms after power-up or brown-out. Use Value: Guarantees deterministic microcontroller initialization before firmware execution, eliminating boot failures caused by marginal supply ramp rates. |
Use Scenario: Ensuring safe startup and shutdown of low-power ARM-based diagnostic instruments with dual 2.5 V sensor and 3.3 V processing rails. IC Role / Device Role / Timing Role: Uses REF pin as precision ADC reference; SENSE monitors 2.5 V rail directly; CT set to 0.1 µF for 1.3 ms reset hold time. Use Value: Eliminates need for separate voltage reference IC and reset generator, reducing BOM count and PCB area in space-constrained medical enclosures. |
| Automotive Body Control Module (BCM) | Industrial IoT Gateway |
|
Use Scenario: Cold-cranking resilience in 12 V automotive BCMs where battery voltage dips below 6 V during engine start. IC Role / Device Role / Timing Role: SENSE tied to regulated 5 V rail; RESIN linked to ignition signal; RESET holds MCU in reset until post-cranking stabilization. Use Value: Prevents spurious MCU resets during transient undervoltage events, improving functional safety compliance without complex watchdog coordination. |
Use Scenario: Reliable boot sequencing in fanless, convection-cooled gateways using 5 V PoE-derived power with variable load transients. IC Role / Device Role / Timing Role: Monitors 5 V rail directly at SENSE; REF supplies bias to isolated CAN transceiver; RESET drives FPGA configuration reset. Use Value: Provides synchronized, noise-immune reset assertion across CPU, FPGA, and communication peripherals - critical for deterministic network stack initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | Fixed 1.2 V threshold, 200 ms min reset delay, 1.8–6 V supply range | Designed for low-voltage ASICs/FPGAs; lacks REF output and adjustable delay | Select when only basic 1.2 V rail monitoring is needed and longer fixed delay suffices |
| MAX6816EUS+T | Single-channel, 3.08 V threshold, 5 µs debounce, no REF output, 2.7–5.5 V supply | Optimized for pushbutton debouncing and simple microcontroller reset; no SENSE flexibility | Choose for cost-sensitive, single-rail consumer devices where precision reference and dual outputs are unnecessary |
Compared with TPS3808G12DBVR and MAX6816EUS+T, TL7702AIDR uniquely combines a 2.53 V precision threshold, user-adjustable reset timing, and a buffered 2.53 V reference output - making it the only option among the three suitable for systems requiring both accurate low-voltage supervision and a shared analog reference source.
Availability
TL7702AIDR is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and industrial IoT gateway designs requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TL7702AIDR 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 TL77xxA family was engineered for robust, low-cost reset control in microprocessor systems - emphasizing precision threshold accuracy, wide supply tolerance, and flexible timing to replace discrete reset circuits in cost- and space-constrained designs.
FAQ
What is the exact threshold voltage specification for TL7702AIDR?
The TL7702AIDR has a negative-going input threshold voltage (VIT−) of 2.48 V to 2.58 V at 25°C, with a typical value of 2.53 V. This is explicitly specified in the Electrical Characteristics table of the SLVS028K datasheet and applies directly to the TL7702AIDR variant. The threshold remains stable across temperature (±16 mV from –40°C to +85°C) and supply voltage (±10 mV from 3.5 V to 18 V), ensuring consistent 2.5 V rail supervision performance in TL7702AIDR-based designs.
Does TL7702AIDR require external pull-up resistors on its reset outputs?
Yes, TL7702AIDR requires external pull-up resistors on both RESET (Pin 6) and RESET (Pin 5) because they are open-collector outputs. The datasheet specifies that these pins sink current when active but cannot actively drive high. A typical 10 kΩ pull-up to the monitored rail (e.g., 3.3 V or 5 V) ensures proper logic levels for MCU reset inputs. Failure to include pull-ups will result in undefined or floating reset states, compromising system reliability in TL7702AIDR implementations.
Can TL7702AIDR monitor a 2.5 V supply directly without a resistor divider?
Yes, TL7702AIDR can monitor a 2.5 V supply directly at the SENSE pin. Its VIT− threshold of 2.53 V is specifically designed for this purpose, and the absolute maximum SENSE voltage is 6 V (or VCC–1 V), well above 2.5 V. Direct connection eliminates divider errors and component count - a key advantage confirmed in the "TL7702A (Vt = 2.5 V)" application note section of the datasheet. This direct monitoring capability is intrinsic to TL7702AIDR's function and does not require external scaling.
What is the function of the REF pin on TL7702AIDR, and is it mandatory to use?
The REF pin on TL7702AIDR provides a buffered, temperature-compensated 2.53 V reference output. While not mandatory for basic reset functionality, it must be decoupled with a 0.1 µF capacitor to GND to stabilize internal circuitry and prevent noise-induced false resets. Additionally, REF can serve as a precision voltage source for external circuits - such as ADC references or sensor biasing - reducing system BOM. Its stability (±16 mV over temperature) is a documented feature of TL7702AIDR, not optional behavior.
How is the reset pulse duration calculated for TL7702AIDR?
The reset pulse duration (td) for TL7702AIDR is calculated using the formula td = 1.3 × 10⁴ × CT, where CT is the capacitance (in farads) connected between the CT pin (Pin 3) and GND. For example, a 0.1 µF capacitor yields td ≈ 1.3 ms - matching the typical value in the Switching Characteristics table. This relationship is explicitly defined in Section 8.3.2 of the SLVS028K datasheet and applies directly to TL7702AIDR without modification.
TL7702AIDR 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:
- 1µs Maximum Propagation Delay
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7702AIDR FAQ
1.How can I place an order for TL7702AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7702AIDR 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 TL7702AIDR reliable?
The price and inventory of TL7702AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7702AIDR is usually 5 days.
3.What payment methods are accepted for TL7702AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7702AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7702AIDR?
TL7702AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7702AIDR 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 TL7702AIDR?
For technical support, including TL7702AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7702AIDR requirements.
6.How does Aetrix verify that TL7702AIDR is sourced from the original manufacturer or authorized distributors?
All TL7702AIDR 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 TL7702AIDR meets industry standards.
7.What is the process for return or replacement of TL7702AIDR?
All TL7702AIDR units undergo pre-shipment inspection (PSI). If there is an issue with TL7702AIDR, 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 TL7702AIDR part is unused and in its original packaging.
Return procedure for TL7702AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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