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Texas Instruments TL7702ACD
- Part No.:
- TL7702ACD
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7702ACD.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,386
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Product details
Overview
TL7702ACD from Texas Instruments is a precision supply-voltage supervisor IC designed for reset control in microcomputer systems. It features a 2.53 V (typ) undervoltage detection threshold at SENSE, operates from 3.5 V to 18 V supply, delivers dual active-high/active-low reset outputs (RESET and RESET), and supports externally adjustable reset pulse duration via CT capacitor. It is used in embedded systems requiring reliable power-on and brownout reset signaling.
For engineers reviewing the TL7702ACD datasheet, TL7702ACD pinout, TL7702ACD application, or TL7702ACD equivalent, this page provides verified technical context, real-world timing behavior, package-specific layout guidance, and validated alternative options for industrial and computing reset circuit design.
Technical Context
The TL7702ACD implements a precision voltage-sense comparator with temperature-compensated 2.53 V reference, triggering reset when SENSE falls below VIT− (2.48–2.58 V). Its internal delay timer uses an external CT capacitor to generate a programmable reset pulse (0.65–2.6 ms with 0.1 µF), independent of supply voltage variation.
It delivers dual open-collector reset outputs-RESET (active-high) and RESET (active-low)-with ±16 mA drive capability, referenced to GND and compatible with TTL/CMOS logic families. The device remains functional across 0°C to 70°C ambient and requires no external biasing beyond REF decoupling and CT timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 2.48–2.58 V (min/max at 25°C); sets precise 2.53 V nominal undervoltage trip point for 3.3 V or lower supply monitoring |
| Supply Range | 3.5 V to 18 V; supports wide-input industrial and legacy microcontroller power rails without external regulation |
| Reset Pulse Duration | 0.65–2.6 ms (with 0.1 µF CT); ensures sufficient system initialization time before processor release |
| Reference Voltage | 2.48–2.58 V (±10 mV over 3.5–18 V VCC); stable, temperature-compensated output usable as auxiliary voltage source |
| Output Drive | ±16 mA (RESET/RESET); directly interfaces standard pull-up resistors and logic inputs without buffering |
| Operating Temp | 0°C to 70°C (TL7702ACD grade); qualified for commercial-grade embedded computing and peripheral applications |
| Hysteresis | 10 mV (VIT+ − VIT−); prevents chatter during slow-rising/falling supply transitions |
Pinout & Package
TL7702ACD is housed in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm body), RoHS-compliant with NiPdAu lead finish and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Voltage reference output | Provides stable 2.53 V reference; must be decoupled with 0.1 µF capacitor to GND for noise immunity |
| RESIN (Pin 2) | Manual reset input | Active-low asynchronous reset trigger; accepts TTL-compatible logic levels (VIL ≤ 0.6 V, VIH ≥ 2 V) |
| CT (Pin 3) | Timing capacitor connection | Sets reset pulse width (td = 1.3×10⁴ × CT seconds); connects to GND with ceramic capacitor |
| GND (Pin 4) | Signal ground reference | Return path for all analog and digital functions; must be low-impedance and star-connected near device |
| RESET (Pin 5) | Inverted reset output | Open-collector active-low signal; requires external pull-up for CMOS/TTL compatibility |
| RESET (Pin 6) | Non-inverted reset output | Open-collector active-high signal; complements Pin 5 for dual-signaling or level-shifting needs |
| SENSE (Pin 7) | Supply monitoring input | Monitors regulated rail (e.g., 3.3 V); max input = min(VCC−1 V, 6 V) per datasheet limit |
| VCC (Pin 8) | Power supply input | Primary supply input (3.5–18 V); powers internal circuitry and enables reset generation |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable reset pulse | Capacitor-programmable delay (0.65–2.6 ms with 0.1 µF) eliminates fixed-timing constraints in BOM-sensitive designs |
| Temperature-compensated reference | 2.53 V ±10 mV over full supply range and ±16 mV over –40°C to +85°C; enables stable sensing without calibration |
| Dual complementary reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals simplify interface to diverse MCU reset architectures |
| Wide operating supply range | 3.5 V to 18 V operation supports direct connection to unregulated or multi-rail systems without LDO dependency |
| Low quiescent current | 1.8–3 mA supply current enables use in always-on monitoring circuits without significant power penalty |
Applications
| Industrial PLC Controller | Medical Diagnostic Handheld |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers with multiple isolated DC rails. IC Role / Device Role / Timing Role: Monitors 3.3 V I/O rail and asserts synchronized reset to FPGA and ARM Cortex-M core upon undervoltage. Use Value: Prevents metastability and register corruption during brownout by guaranteeing ≥1.2 ms reset hold time with 0.1 µF CT. |
Use Scenario: Battery-powered portable ultrasound unit requiring deterministic boot after Li-ion voltage sag. IC Role / Device Role / Timing Role: Senses 3.3 V system rail derived from buck converter; triggers hardware reset before ADC/DAC initialization. Use Value: Eliminates firmware-level watchdog dependency with guaranteed 2.53 V threshold accuracy across 0–70°C operating range. |
| Automotive Infotainment Head Unit | Network Router Power Management |
Use Scenario: Cold-cranking resilience in 12 V automotive systems where main supply dips below 6 V during engine start. IC Role / Device Role / Timing Role: Monitors post-regulator 5 V rail using resistor divider on SENSE; generates clean reset pulse after voltage recovery. Use Value: Avoids false resets during transient dips via 10 mV hysteresis and robust 3.5–18 V supply tolerance. |
Use Scenario: Multi-stage power-up coordination in enterprise-grade routers with separate CPU, PHY, and memory rails. IC Role / Device Role / Timing Role: Provides sequenced reset assertion across domains using dual outputs and external RC timing. Use Value: Enables deterministic boot order without complex CPLD-based sequencing logic or additional supervisors. |
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% threshold accuracy (vs. TL7702ACD's ±2%); integrates watchdog timer; 1.8–6 V supply only | Requires external voltage divider for >6 V rails; lacks dual complementary outputs | Preferred for low-voltage, high-accuracy applications where watchdog functionality is needed and supply ≤6 V |
| MAX6326UT29D3+T | 2.93 V fixed threshold; 1.6–5.5 V supply; push-pull (not open-collector) outputs; no REF output | Not suitable for 3.3 V rail monitoring without scaling; incompatible with existing pull-up resistor networks | Appropriate for space-constrained designs needing ultra-low IQ (<1 µA) and fixed-threshold simplicity on sub-5.5 V supplies |
Compared with TL7702ACD, TPS3808G01DBVR offers tighter threshold tolerance but narrower supply range and no reference output, while MAX6326UT29D3+T sacrifices flexibility for ultra-low power and fixed timing-neither provides the same combination of programmable delay, dual outputs, and 3.5–18 V operation.
Availability
TL7702ACD is available at Aetrix Electronics and suitable for industrial automation, medical handhelds, and automotive infotainment systems requiring stable component supply with long-term lifecycle support.
Supply support for TL7702ACD 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 company specializing in analog and embedded processing technologies, with decades of leadership in power management and supervisory ICs.
The TL77xxA product line was engineered specifically for robust, low-cost reset control in microprocessor systems-emphasizing precision threshold stability, wide supply tolerance, and field-proven reliability in commercial-grade environments.
FAQ
What is the exact undervoltage detection threshold of the TL7702ACD?
The TL7702ACD has a nominal undervoltage detection threshold of 2.53 V at the SENSE pin, with a guaranteed range of 2.48 V to 2.58 V at 25°C. This threshold is temperature-compensated and maintains ±10 mV stability over the full 3.5–18 V supply range, making it ideal for precise 3.3 V rail monitoring in the TL7702ACD application.
Can the TL7702ACD monitor a 5 V supply directly?
No-the TL7702ACD's SENSE input maximum voltage is limited to min(VCC−1 V, 6 V), and its fixed 2.53 V threshold is optimized for 3.3 V or lower rails. To monitor a 5 V supply, a resistor divider must scale the voltage to ~2.53 V at SENSE; alternatively, the TL7705ACD (4.55 V threshold) is the correct family variant for direct 5 V supervision.
Does the TL7702ACD require external pull-up resistors on its reset outputs?
Yes-both RESET (Pin 6) and RESET (Pin 5) are open-collector outputs. Each requires an external pull-up resistor (typically 4.7 kΩ to 10 kΩ) to VCC or logic rail to establish valid HIGH states. This design allows flexible voltage translation and wired-OR reset bus configurations in the TL7702ACD implementation.
How is the reset pulse duration set on the TL7702ACD?
The reset pulse duration is set by an external capacitor connected to the CT pin (Pin 3). Using the formula td = 1.3 × 10⁴ × CT, a 0.1 µF capacitor yields a typical pulse width of 1.3 ms. This externally adjustable timing eliminates reliance on internal RC tolerances and enables precise reset hold time tuning in the TL7702ACD design.
Is the REF pin on the TL7702ACD intended for use as a system reference voltage?
Yes-the REF pin (Pin 1) delivers a stable, temperature-compensated 2.53 V output with <±10 mV variation over supply and temperature. It can serve as an auxiliary reference for ADCs, comparators, or bias networks, provided it is decoupled with a 0.1 µF capacitor to GND-this capability is explicitly documented in the TL7702ACD datasheet and enhances system integration efficiency.
TL7702ACD 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:
- 1µs Maximum Propagation Delay
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7702ACD FAQ
1.How can I place an order for TL7702ACD through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7702ACD 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 TL7702ACD reliable?
The price and inventory of TL7702ACD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7702ACD is usually 5 days.
3.What payment methods are accepted for TL7702ACD?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7702ACD?
TL7702ACD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7702ACD 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 TL7702ACD?
For technical support, including TL7702ACD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7702ACD requirements.
6.How does Aetrix verify that TL7702ACD is sourced from the original manufacturer or authorized distributors?
All TL7702ACD 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 TL7702ACD meets industry standards.
7.What is the process for return or replacement of TL7702ACD?
All TL7702ACD units undergo pre-shipment inspection (PSI). If there is an issue with TL7702ACD, 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 TL7702ACD part is unused and in its original packaging.
Return procedure for TL7702ACD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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