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Texas Instruments TL7759CD
- Part No.:
- TL7759CD
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7759CD.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:928
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Product details
Overview
TL7759CD from Texas Instruments is a supply-voltage supervisor IC designed for microcomputer and microprocessor system reset control. It provides precision undervoltage monitoring with 4.55 V ±120 mV input threshold, true/complementary reset outputs (RESET/RESET), and operates across 1 V to 7 V supply range. Its low 20 µA standby current and defined reset behavior above 1 V make it suitable for embedded power-on reset generation in industrial controllers.
For engineers reviewing the TL7759CD datasheet, TL7759CD pinout, TL7759CD application, or TL7759CD equivalent, this page delivers verified technical context, package-specific timing behavior, functional differences among TL7759 variants, and real-world design implications of its hysteresis (30–70 mV), propagation delay (5 µs), and dual-output drive capability.
Technical Context
The TL7759CD implements a precision bandgap reference-based comparator with internal hysteresis to detect VCC drops below 4.4 V (min) and ensure clean reset assertion. Its dual open-collector outputs-RESET (active-low) and RESET (active-high)-enable direct interface to both active-low and active-high reset inputs without external inversion logic.
It features guaranteed reset assertion when VCC exceeds 1 V, enabling reliable initialization even during slow-ramp or brownout conditions. The device's 5 µs propagation delay and 1 µs rise/fall times support fast-response reset signaling in systems requiring tight timing margins between power stabilization and processor release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Threshold Voltage (VIT–) | 4.4 V to 4.7 V - defines minimum VCC level at which reset deasserts during power-up; critical for avoiding premature processor release |
| Hysteresis (Vhys) | 30 mV to 70 mV - prevents reset chatter near threshold during noisy or slowly recovering supplies |
| Supply Voltage Range | 1 V to 7 V - supports operation from early power ramp through full 5 V or 3.3 V nominal rails |
| Reset Propagation Delay | 5 µs max - ensures deterministic timing between VCC crossing threshold and output state change |
| Standby Current (ICC) | 20 µA - enables low-power retention in battery-backed or energy-sensitive applications |
| Output Drive Capability | 24 mA sink (RESET), –8 mA source (RESET) - directly drives standard logic inputs and small capacitive loads without buffering |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including PLC I/O modules and instrumentation front-ends |
Pinout & Package
TL7759CD is housed in an 8-pin SOIC (D) package per JEDEC MS-012, variation AA, with 1.27 mm lead pitch and 1.75 mm max height. Pin 1 is located at the top-left corner adjacent to the index notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply input - powers internal reference and comparators; must be ≥1 V for defined reset output states |
| 2 | NC | No internal connection - left unconnected; no routing or grounding required |
| 3 | NC | No internal connection - left unconnected; no routing or grounding required |
| 4 | GND | Ground reference - common return for all internal circuitry and output stages |
| 5 | RESET | Active-low open-collector reset output - sinks up to 24 mA; requires external pull-up for logic-high state |
| 6 | RESET | Active-high open-collector reset output - sources up to –8 mA; requires external pull-down for logic-low state |
| 7 | NC | No internal connection - left unconnected; no routing or grounding required |
| 8 | NC | No internal connection - left unconnected; no routing or grounding required |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.55 V threshold with ±120 mV tolerance | Enables accurate reset activation at standard 5 V rail levels while accommodating manufacturing and temperature drift |
| True and complementary reset outputs | Eliminates need for external inverters when interfacing to mixed-reset-logic systems (e.g., MCU with active-low reset + FPGA with active-high reset) |
| Reset defined above 1 V supply | Guarantees predictable reset state during slow power ramps or partial brownouts, preventing undefined processor behavior |
| Low 20 µA standby current | Minimizes quiescent power draw in always-on supervisory circuits, extending battery life in portable or backup-powered systems |
| Wide 1 V to 7 V operating range | Supports direct use across 3.3 V, 5 V, and legacy 6 V systems without external voltage scaling or regulation |
Applications
| Industrial PLC I/O Module | Embedded Data Logger |
|---|---|
|
Use Scenario: Power-up sequencing and brownout recovery in modular I/O subsystems with isolated 5 V logic rails. IC Role / Device Role / Timing Role: Voltage supervisor generating synchronized active-low RESET and active-high RESET signals to initialize microcontroller and FPGA simultaneously. Use Value: Prevents metastability in dual-processor architectures by ensuring both devices exit reset only after stable 5 V rail is confirmed, using the same 4.55 V threshold and 5 µs delay. |
Use Scenario: Battery-backed environmental sensor node requiring reliable wake-from-sleep reset after power restoration. IC Role / Device Role / Timing Role: Supervisor asserting RESET until VCC rises above 4.4 V and remains stable, then holding RESET high for ≥5 µs before release. Use Value: Enables deterministic firmware boot after battery swap or charger reconnection, leveraging 20 µA quiescent current to preserve backup power during extended off periods. |
| Medical Diagnostic Instrument | Point-of-Sale Terminal |
|
Use Scenario: Safety-critical power monitoring in handheld ultrasound units with dual 3.3 V and 5 V domains. IC Role / Device Role / Timing Role: Single-supply monitor on main 5 V rail, driving both microcontroller reset and analog front-end enable via complementary outputs. Use Value: Ensures analog signal chain is held in known state (via RESET) while digital core initializes (via RESET), eliminating transient glitches during power-up. |
Use Scenario: Retail terminal with hot-swappable power adapter and USB host controller requiring glitch-free reset coordination. IC Role / Device Role / Timing Role: Reset generator asserting both outputs within 5 µs of VCC crossing 4.55 V, with hysteresis preventing bounce during AC adapter switching transients. Use Value: Guarantees USB enumeration starts only after stable 5 V is confirmed, avoiding enumeration failures caused by marginal supply dips during plug-in events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V threshold; push-pull outputs; 1.8 µA typical ICC; 200 ms programmable delay option | Designed for lower-voltage systems; lacks complementary outputs; requires external RC for delay tuning | Prefer when 3.3 V rail supervision is primary need and board space allows for delay configuration components |
| MAX809SEUR+T | 4.63 V threshold (±2.5%); single active-low reset output; 12 µA ICC; SOT-23-3 package | Smaller footprint but no RESET complement; tighter threshold tolerance but no hysteresis spec provided | Choose for space-constrained designs where only one reset polarity is needed and higher threshold accuracy outweighs dual-output flexibility |
Compared with TL7759CD, TPS3808G33DBVR offers ultra-low current and delay configurability but targets 3.3 V systems exclusively, while MAX809SEUR+T saves board area and improves threshold precision yet sacrifices the complementary output architecture essential for mixed-logic reset distribution.
Availability
TL7759CD is available at Aetrix Electronics and suitable for industrial automation, embedded data acquisition, and medical diagnostics requiring stable component supply across long-lifecycle production programs.
Supply support for TL7759CD 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions since 1930.
The TL77xx family was developed specifically for robust, low-cost power-supply monitoring in microprocessor-based systems, emphasizing precision threshold stability, dual-output flexibility, and wide-voltage operation without external components.
FAQ
What is the exact input voltage threshold specification for TL7759CD?
The TL7759CD has a negative-going input threshold voltage (VIT–) of 4.4 V (min) to 4.7 V (max) over its full operating temperature range of 0°C to 70°C. At 25°C, the typical value is 4.55 V ±120 mV. This threshold determines the lowest VCC level at which the device releases reset, and it is factory-trimmed for consistency across production lots.
Does TL7759CD require external components to function as a reset generator?
No, TL7759CD operates autonomously without external resistors or capacitors. Its internal precision reference and comparator eliminate the need for external threshold-setting networks. Only external pull-up (for RESET) and pull-down (for RESET) resistors are required to establish logic levels, as both outputs are open-collector.
Can TL7759CD be used with a 3.3 V supply rail?
Yes, TL7759CD supports supply voltages from 1 V to 7 V, making it fully compatible with 3.3 V systems. However, its 4.4–4.7 V threshold means it will assert reset continuously on a nominal 3.3 V rail. It is intended for monitoring higher rails (e.g., 5 V) or used with external resistor dividers to scale down higher voltages for supervision.
What is the meaning of "NC" pins on TL7759CD, and how should they be handled?
The TL7759CD has four NC (No Connection) pins - pins 2, 3, 7, and 8 - with no internal bonding or circuit connection. These pins must remain unconnected on the PCB; neither grounding nor routing is required or recommended. Leaving them floating poses no functional or reliability risk per TI's characterization.
How does the hysteresis of TL7759CD improve system reliability?
TL7759CD provides 30–70 mV of hysteresis between its positive- and negative-going thresholds, preventing rapid reset toggling during supply voltage fluctuations near the trip point. This eliminates false resets caused by noise, ripple, or slow recovery after brief brownouts - a key requirement in electrically noisy industrial environments where TL7759CD is commonly deployed.
TL7759CD 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:
- 4.55V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 5µs Maximum Propagation Delay
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7759CD FAQ
1.How can I place an order for TL7759CD through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7759CD 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 TL7759CD reliable?
The price and inventory of TL7759CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7759CD is usually 5 days.
3.What payment methods are accepted for TL7759CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7759CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7759CD?
TL7759CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7759CD 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 TL7759CD?
For technical support, including TL7759CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7759CD requirements.
6.How does Aetrix verify that TL7759CD is sourced from the original manufacturer or authorized distributors?
All TL7759CD 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 TL7759CD meets industry standards.
7.What is the process for return or replacement of TL7759CD?
All TL7759CD units undergo pre-shipment inspection (PSI). If there is an issue with TL7759CD, 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 TL7759CD part is unused and in its original packaging.
Return procedure for TL7759CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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