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Texas Instruments TL7709ACDG4
- Part No.:
- TL7709ACDG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7709ACDG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,893
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Product details
Overview
TL7709ACDG4 from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microprocessor systems operating at 9 V nominal supply rails. It features a 7.6 V ±0.1 V threshold voltage (VIT−), 20 mV hysteresis, externally adjustable reset pulse duration via CT pin (e.g., 1.3 ms with 0.1 µF), and dual active-high/active-low open-collector RESET outputs. It is used in industrial control units where reliable power-on and brownout reset sequencing is required.
For engineers reviewing the TL7709ACDG4 datasheet, TL7709ACDG4 pinout, TL7709ACDG4 application, or TL7709ACDG4 equivalent, key selection considerations include its fixed 7.6 V trip point, SOIC-8 package compatibility, −40°C to +85°C industrial temperature grade, and requirement for external timing capacitor and pull-up resistors on open-collector outputs.
Technical Context
The TL7709ACDG4 implements a precision bandgap-based voltage reference (2.53 V typ) feeding a comparator that monitors the SENSE input against a trimmed threshold of 7.6 V. Its internal delay timer uses an external capacitor (CT) to generate a programmable reset pulse width governed by td = 1.3 × 104 × CT (seconds).
It operates across 3.5 V to 18 V supply range, delivers ±16 mA output drive capability on both RESET and RESET pins, and maintains stable reference voltage (<±16 mV over −40°C to +85°C). The device enters undefined state only when VCC falls below 2 V, ensuring robust power-down behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 7.6 V ±0.1 V - precise undervoltage detection point for 9 V rail monitoring |
| 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 systems |
| Reset Pulse Width | 1.3 ms (typ, with 0.1 µF CT) - ensures sufficient microcontroller initialization time |
| Reference Voltage | 2.53 V (typ) - stable internal reference usable for external circuit biasing |
| Output Type | Open-collector RESET and RESET - enables flexible logic-level translation and wired-OR configurations |
| Operating Temp | 0°C to 70°C (C-grade) - validated for commercial and industrial ambient environments |
Pinout & Package
TL7709ACDG4 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, RoHS-compliant with NiPdAu lead finish and moisture sensitivity level (MSL) 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Voltage reference output | Provides stable 2.53 V reference for external use; requires 0.1 µF bypass capacitor to GND |
| 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 duration per td = 1.3 × 104 × CT; noise-sensitive-requires short trace and local decoupling |
| GND (Pin 4) | Signal ground reference | Common return for all analog and digital functions; must be low-impedance and isolated from noisy power paths |
| RESET (Pin 5) | Inverted reset output | Active-low open-collector output; requires external pull-up for proper logic HIGH assertion |
| RESET (Pin 6) | Non-inverted reset output | Active-high open-collector output; requires external pull-up for proper logic HIGH assertion |
| SENSE (Pin 7) | Supply monitoring input | Monitors external rail (e.g., 9 V); threshold set internally to 7.6 V; max input 15 V |
| VCC (Pin 8) | Power supply input | Primary supply input (3.5–18 V); powers internal circuitry and defines operating margin |
Key Features
| Feature | Design Value |
|---|---|
| Power-on reset generator | Guarantees valid reset assertion until VCC reaches ≥3.6 V and SENSE exceeds 7.6 V |
| Automatic brownout recovery | Reasserts RESET/RESET within 2 µs after SENSE drops below 7.6 V − 20 mV |
| Externally adjustable pulse duration | Enables system-specific reset timing tuning without changing IC-supports 0.65–2.6 ms range with standard capacitors |
| Temperature-compensated reference | 2.53 V reference varies <±16 mV from −40°C to +85°C-enables stable threshold accuracy across environment |
| Wide supply voltage operation | Functions reliably from 3.5 V to 18 V-suitable for multi-rail systems and legacy 9 V/12 V designs |
Applications
| Industrial PLC I/O Module | Legacy 9 V Microcontroller System |
|---|---|
Use Scenario: Power sequencing in modular programmable logic controller backplanes with mixed 5 V, 9 V, and 24 V rails. IC Role / Device Role / Timing Role: Primary supervisor for the 9 V logic rail, generating synchronized reset pulses to CPU, FPGA, and peripheral ASICs. Use Value: Prevents metastability and latch-up during brownout events by holding reset until 9 V rail stabilizes above 7.6 V with 20 mV hysteresis. |
Use Scenario: Reset management in TMS1XXXNLL-based embedded controllers deployed in factory automation equipment. IC Role / Device Role / Timing Role: Dedicated reset controller interfacing directly to SENSE (9 V rail) and driving RESET (active-low) to microcontroller's /RESET pin. Use Value: Ensures 1.3 ms minimum reset pulse width (via 0.1 µF CT) compliant with TMS1XXXNLL datasheet requirements for reliable boot initialization. |
| Multi-Supply Embedded Instrument | DC-DC Converter Monitoring Interface |
Use Scenario: Coordinating startup of analog front-end (±15 V), digital core (5 V), and interface (9 V) supplies in portable test equipment. IC Role / Device Role / Timing Role: Monitors 9 V auxiliary rail and triggers cascaded reset chain via RESIN input to other supervisors. Use Value: Enables deterministic power-up order using manual reset chaining-avoids race conditions between independent supply domains. |
Use Scenario: Supervising output of isolated 9 V DC-DC converter powering isolated communication interfaces (RS-485, CAN transceivers). IC Role / Device Role / Timing Role: SENSE connected to regulated 9 V output; RESET drives enable/disable logic for downstream load switches. Use Value: Provides fail-safe shutdown signal when converter output sags below 7.6 V-prevents corrupted data transmission due to marginal supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL7709ACP | Same electrical specs and pinout; PDIP-8 package (9.81 mm × 6.35 mm) instead of SOIC-8 | Through-hole mounting; higher thermal resistance (RθJA = 85°C/W vs. 97°C/W) and no MSL rating | Select for prototyping, legacy board rework, or high-reliability through-hole assembly where surface-mount is not feasible. |
| TPS3808G33DBVR | 3.3 V fixed threshold; 200 ms min reset pulse; push-pull outputs; 1.8–6.5 V supply range | Not suitable for 9 V rail monitoring; requires different voltage divider or replacement of entire supervision scheme | Choose only if redesigning for lower-voltage systems; not a functional substitute for TL7709ACDG4's 7.6 V threshold and 9 V application context. |
Compared with TL7709ACP and TPS3808G33DBVR, TL7709ACDG4 uniquely supports 9 V rail supervision with programmable timing, SOIC-8 footprint, and industrial temperature range-making it irreplaceable in legacy 9 V microcontroller systems without layout or schematic revision.
Availability
TL7709ACDG4 is available at Aetrix Electronics and suitable for industrial control systems, legacy microcontroller platforms, and multi-rail embedded instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for TL7709ACDG4 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 family-including TL7709ACDG4-is engineered for robust reset control in microcomputer and microprocessor systems, emphasizing precision threshold accuracy, wide supply tolerance, and field-proven reliability in industrial environments.
FAQ
What is the exact undervoltage threshold voltage of TL7709ACDG4?
The TL7709ACDG4 has a guaranteed negative-going input threshold voltage (VIT−) of 7.5 V to 7.7 V at 25°C, with a typical value of 7.6 V. This threshold is factory-trimmed and applies specifically to the TL7709A variant within the TL77xxA family, making it suitable for monitoring 9 V supply rails with 1.3 V headroom.
Does TL7709ACDG4 require external components to operate?
Yes, TL7709ACDG4 requires three external components for basic operation: a 0.1 µF capacitor from REF to GND, a timing capacitor (CT) from Pin 3 to GND to set reset pulse width, and pull-up resistors on both RESET (Pin 6) and RESET (Pin 5) outputs since they are open-collector. These are mandatory per TI's recommended design practices.
Can TL7709ACDG4 monitor a 12 V supply rail?
No-TL7709ACDG4 is specified for SENSE input up to 15 V maximum, but its internal threshold is fixed at 7.6 V. To supervise a 12 V rail, use TL7712A (10.8 V threshold) instead. Applying 12 V directly to SENSE on TL7709ACDG4 would exceed its intended trip point and risk unreliable reset behavior.
What is the function of the RESIN pin on TL7709ACDG4?
The RESIN pin (Pin 2) on TL7709ACDG4 provides an active-low manual reset input. When pulled below 0.6 V, it forces both RESET and RESET outputs into their active states regardless of SENSE or VCC conditions-enabling system-level reset initiation, watchdog timeout recovery, or operator-triggered reboot sequences.
Is TL7709ACDG4 compatible with lead-free PCB assembly processes?
Yes, TL7709ACDG4 is RoHS-compliant with NiPdAu lead finish and rated for MSL Level-1 (unlimited floor life at ≤30°C/60% RH), supporting standard lead-free reflow profiles up to 260°C peak temperature. Its SOIC-8 package is qualified for both wave and reflow soldering per JEDEC J-STD-020.
TL7709ACDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
TL7709ACDG4 FAQ
1.How can I place an order for TL7709ACDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7709ACDG4 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 TL7709ACDG4 reliable?
The price and inventory of TL7709ACDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7709ACDG4 is usually 5 days.
3.What payment methods are accepted for TL7709ACDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7709ACDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7709ACDG4?
TL7709ACDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7709ACDG4 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 TL7709ACDG4?
For technical support, including TL7709ACDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7709ACDG4 requirements.
6.How does Aetrix verify that TL7709ACDG4 is sourced from the original manufacturer or authorized distributors?
All TL7709ACDG4 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 TL7709ACDG4 meets industry standards.
7.What is the process for return or replacement of TL7709ACDG4?
All TL7709ACDG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL7709ACDG4, 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 TL7709ACDG4 part is unused and in its original packaging.
Return procedure for TL7709ACDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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