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Texas Instruments TL7709ACD
- Part No.:
- TL7709ACD
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7709ACD.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:266
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Product details
Overview
TL7709ACD from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microprocessor systems, featuring a 7.6 V ±0.1 V threshold voltage (VIT−), 20 mV hysteresis, externally adjustable reset pulse duration via CT pin, and dual active-high/active-low open-collector RESET outputs. It operates across 3.5 V to 18 V supply range and supports 0°C to 70°C industrial temperature operation in SOIC-8 package.
For engineers reviewing the TL7709ACD datasheet, TL7709ACD pinout, TL7709ACD application, or TL7709ACD equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed timing behavior, real-world reset circuit implementation guidance, and cross-referenced alternatives for embedded power-monitoring designs requiring reliable undervoltage detection and controlled system initialization.
Technical Context
The TL7709ACD implements a precision bandgap-based voltage reference with <±10 mV supply variation and <±16 mV temperature drift (–40°C to +85°C), feeding a comparator that monitors SENSE input against a trimmed 7.6 V trip point. Its internal delay timer uses an external capacitor (CT) to generate a programmable reset pulse (0.65–2.6 ms typical with 0.1 µF).
It features dual complementary reset outputs (RESET and RESET) with open-collector topology, enabling flexible interface to TTL/CMOS logic, and includes RESIN for manual reset override and REF for external reference use. The device guarantees functional operation only above VCC = 3.6 V and enters undefined state below 2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 7.5 V to 7.7 V at 25°C - precise undervoltage detection point for 9 V nominal rails |
| Hysteresis | 20 mV - prevents chatter during slow-rising/falling supply transitions |
| Supply Range | 3.5 V to 18 V - supports wide-input industrial and legacy microcontroller systems |
| Reset Pulse Duration | 0.65–2.6 ms (with 0.1 µF CT) - ensures sufficient hold time for CPU/MCU initialization |
| Reference Voltage | 2.48–2.58 V - stable, temperature-compensated output usable for external analog circuits |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial ambient environments |
| Output Type | Open-collector RESET and RESET - enables wired-OR configuration and level-shifting flexibility |
Pinout & Package
TL7709ACD is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and RoHS-compliant NiPdAu lead finish. Thermal resistance RθJA is 97°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Voltage reference output | Provides stable 2.5 V reference for external circuitry; requires 0.1 µF bypass to GND |
| RESIN (Pin 2) | Manual reset input | Active-low asynchronous reset trigger; overrides automatic supervision when pulled low |
| CT (Pin 3) | Timing capacitor connection | Sets reset pulse width per td = 1.3×10⁴×CT; 0.1 µF yields ~1.3 ms delay |
| GND (Pin 4) | Ground reference | Common return path for all internal circuitry and external decoupling capacitors |
| RESET (Pin 5) | Inverted reset output | Active-low open-collector signal; requires external pull-up for logic-high assertion |
| RESET (Pin 6) | Non-inverted reset output | Active-high open-collector signal; requires external pull-up for logic-high assertion |
| SENSE (Pin 7) | Supply monitoring input | Monitors regulated rail (e.g., 9 V) for undervoltage; threshold set internally to 7.6 V |
| VCC (Pin 8) | Power supply input | Primary power source (3.5–18 V); powers internal circuitry and enables supervision function |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable reset pulse | Capacitor-programmable delay (0.65–2.6 ms typical) eliminates fixed-timing constraints in BOM |
| Precision voltage sensing | 7.6 V ±0.1 V threshold with 20 mV hysteresis ensures repeatable, noise-immune reset activation |
| Temperature-compensated reference | 2.5 V output stable within ±16 mV over –40°C to +85°C - usable as system-level analog reference |
| Dual complementary reset outputs | Simultaneous active-high and active-low signals simplify interface to diverse logic families and FPGA reset controllers |
| Wide operating supply range | 3.5 V to 18 V operation supports legacy 9 V, 12 V, and modern multi-rail embedded systems without auxiliary regulators |
Applications
| Industrial PLC Controller | Legacy 9 V Microcontroller System |
|---|---|
Use Scenario: Power sequencing and brownout protection in programmable logic controllers with 9 V DC input rails. IC Role / Device Role / Timing Role: Monitors 9 V supply at SENSE pin; asserts RESET on drop below 7.6 V to halt CPU execution and prevent corrupted I/O states. Use Value: Prevents firmware lockup and EEPROM corruption during line sags by guaranteeing >1.3 ms reset hold time via CT capacitor. |
Use Scenario: Reset generation for TMS1XXXNLL-based microcomputer systems powered from unregulated 9 V wall adapters. IC Role / Device Role / Timing Role: Acts as dedicated supervisor replacing discrete RC-reset networks; provides accurate, temperature-stable threshold detection. Use Value: Eliminates timing drift and false resets caused by resistor/capacitor tolerance and thermal coefficient mismatches. |
| Multi-Rail Power Management | Embedded Instrumentation Front-End |
Use Scenario: Coordinating reset sequencing across 5 V, 9 V, and 12 V rails in test equipment with mixed-voltage ASICs. IC Role / Device Role / Timing Role: Supervises primary 9 V rail; RESET output triggers secondary supervisors or power-good latches for dependent supplies. Use Value: Enables deterministic power-up order without custom timing networks or FPGA-based sequencing logic. |
Use Scenario: Ensuring clean startup of analog front-end modules (ADC drivers, sensor amplifiers) powered from 9 V supplies. IC Role / Device Role / Timing Role: Holds digital control logic in reset until analog rails stabilize; REF pin supplies bias voltage to precision op-amps. Use Value: Avoids transient glitches and ADC conversion errors during power ramp by synchronizing analog/digital domain readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL7709ACP | Same electrical specs and pinout; packaged in 8-pin PDIP (9.81 mm × 6.35 mm) instead of SOIC-8 | Preferred for through-hole prototyping, legacy board rework, or high-vibration environments where surface-mount reliability is a concern | Select TL7709ACP when manual soldering, socket-based testing, or mechanical robustness outweighs PCB space constraints. |
| TPS3808G33 | 3.3 V fixed threshold, 200 ms min reset timeout, higher accuracy (±0.5%), integrated watchdog timer, and enable input | Designed for modern 3.3 V microcontrollers; lacks adjustable delay and dual reset outputs; requires different timing architecture | Choose TPS3808G33 only for new 3.3 V designs needing tighter threshold tolerance and watchdog functionality - not a drop-in replacement. |
Compared with TL7709ACP and TPS3808G33, the TL7709ACD offers unique value in legacy 9 V systems requiring SOIC-8 footprint, field-adjustable reset timing, and dual complementary outputs - capabilities neither alternative replicates without redesign.
Availability
TL7709ACD is available at Aetrix Electronics and suitable for industrial PLC controllers, legacy microcontroller systems, multi-rail power management, and embedded instrumentation front-ends requiring stable component supply with guaranteed long-term sourcing.
Supply support for TL7709ACD 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 founded in 1930, specializing in analog, embedded processing, and power management technologies with broad industrial, automotive, and communications product portfolios.
The TL77xxA family was engineered specifically as cost-effective, precision supply-voltage supervisors for microcomputer and microprocessor reset control - targeting reliability-critical applications where predictable power-on and brownout response is mandatory.
FAQ
What is the exact undervoltage detection threshold of the TL7709ACD?
The TL7709ACD has a guaranteed negative-going input threshold voltage (VIT−) of 7.5 V to 7.7 V at 25°C, with typical value 7.6 V. This threshold applies to the SENSE pin and is factory-trimmed for precision. Hysteresis is 20 mV, ensuring stable switching without oscillation during marginal supply conditions. The TL7709ACD does not monitor VCC directly - it relies on the external voltage applied to SENSE.
How do I configure the reset pulse duration for the TL7709ACD?
Reset pulse duration on the TL7709ACD 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 ~1.3 ms typical delay. Values between 0.01 µF and 1 µF produce pulses from ~130 µs to ~13 ms. Ensure CT is ceramic or film type with low leakage; place close to the IC with short traces to minimize noise coupling.
Can the TL7709ACD be used with a 5 V supply rail?
No - the TL7709ACD is designed for 9 V nominal systems and has a fixed 7.6 V threshold. Applying it to a 5 V rail would cause immediate, permanent assertion of RESET since SENSE voltage (5 V) remains below the 7.5–7.7 V trip point. For 5 V systems, use TL7705ACD (4.55 V threshold) or TL7702ACD (2.5 V threshold) instead. Threshold is not user-adjustable on TL7709ACD.
What is the purpose of the REF pin on the TL7709ACD?
The REF pin (Pin 1) on the TL7709ACD outputs a precision 2.48–2.58 V temperature-compensated reference voltage. It is intended for use as a stable bias source in external analog circuits - such as ADC references, op-amp feedback networks, or sensor excitation - and must be bypassed with a 0.1 µF capacitor to GND to suppress noise and ensure regulator stability. It is not used for internal supervision.
Does the TL7709ACD support manual reset override?
Yes - the TL7709ACD includes a dedicated RESIN (Pin 2) input for manual reset override. Driving RESIN low forces both RESET and RESET outputs into their active states regardless of SENSE voltage or supply condition. This allows system-level reset initiation via pushbutton, microcontroller GPIO, or watchdog timeout signal. RESIN is active-low and compatible with TTL/CMOS logic levels.
TL7709ACD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 7.6V
- 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
TL7709ACD FAQ
1.How can I place an order for TL7709ACD through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7709ACD 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 TL7709ACD reliable?
The price and inventory of TL7709ACD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7709ACD is usually 5 days.
3.What payment methods are accepted for TL7709ACD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7709ACD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7709ACD?
TL7709ACD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7709ACD 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 TL7709ACD?
For technical support, including TL7709ACD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7709ACD requirements.
6.How does Aetrix verify that TL7709ACD is sourced from the original manufacturer or authorized distributors?
All TL7709ACD 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 TL7709ACD meets industry standards.
7.What is the process for return or replacement of TL7709ACD?
All TL7709ACD units undergo pre-shipment inspection (PSI). If there is an issue with TL7709ACD, 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 TL7709ACD part is unused and in its original packaging.
Return procedure for TL7709ACD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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