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Texas Instruments TL7770-12CN
- Part No.:
- TL7770-12CN
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
TL7770-12CN.pdf
- Description:
- IC SUPERVISOR PWR SUP SUPPORT
- Quantity:
- Payment:
- Shipping:
Inventory:550
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Product details
Overview
TL7770-12CN from Texas Instruments is a dual-channel power-supply supervisor IC designed for microcomputer/microprocessor systems requiring precise 12-V undervoltage and programmable overvoltage monitoring. It delivers true/complementary reset outputs, 250-mA peak SCR gate drive, and externally adjustable reset pulse duration via timing capacitor. Used in industrial power-up sequencing and fault-protected power supplies.
For engineers reviewing the TL7770-12CN datasheet, TL7770-12CN pinout, TL7770-12CN application, or TL7770-12CN equivalent, key selection criteria include its 10.68–11.12 V undervoltage threshold at 1VSU, dual independent sensing channels, SCR-triggered overvoltage protection, and PDIP-16 package compatibility with legacy board layouts.
Technical Context
The TL7770-12CN implements two independent voltage supervisors: Channel 1 monitors a fixed 12-V supply (1VSU) with ±36 mV hysteresis, while Channel 2 supports programmable undervoltage sensing (2VSU) down to 1.47–1.53 V. Each channel features separate RESIN control inputs and CT timing terminals.
Its internal architecture integrates a temperature-compensated voltage reference, dual comparators with hysteresis, a time-delay latch, and an SCR driver stage capable of 25-mA continuous or 250-mA peak gate current - enabling direct triggering of external high-current SCRs during overvoltage events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Undervoltage Threshold (1VSU) | 10.68–11.12 V - sets precise 12-V rail monitoring window with guaranteed trip point |
| Hysteresis (1VSU) | 36 mV - prevents chatter during slow-rising/falling 12-V supply transitions |
| SCR Drive Current | 250 mA peak / 25 mA continuous - directly drives high-current external SCR gates without buffer stages |
| Reset Activation Voltage | 1 V minimum VCC - ensures early reset assertion during brownout or slow power ramp-up |
| Supply Range | 3.5–18 V - supports wide-input industrial and automotive auxiliary rails |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control environments |
| Package | PDIP-16 - through-hole mounting compatible with manual assembly and legacy test fixtures |
Pinout & Package
TL7770-12CN uses a 16-pin plastic DIP (N package) with 0.3-inch body width and standard through-hole footprint. Pin 1 is marked by a notch or dot; leads are spaced 0.1 inch (2.54 mm) apart.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | 1RESIN / 2RESIN | Active-low manual reset inputs - initiate time-delayed reset when pulled low during normal operation |
| 3, 4 | 1CT / 2CT | Timing capacitor connections - set reset pulse duration (td ≈ 20 × 10³ × C) for each channel independently |
| 5, 6 | 1RESET / 2RESET | True active-low reset outputs - drive microcontroller / FPGA reset pins directly |
| 7, 8 | 1RESET / 2RESET | Complementary active-high reset outputs - provide logic-level compatible signals for OR-ing or status indication |
| 9, 10 | 1VSU / 2VSU | Undervoltage sense inputs - monitor system supply rails; 1VSU is factory-set for 12-V, 2VSU is programmable |
| 11, 12 | 1VSO / 2VSO | Overvoltage sense inputs - trigger SCR drive when voltage exceeds 2.48–2.68 V threshold |
| 13, 14 | 1SCR DRIVE / 2SCR DRIVE | SCR gate drive outputs - deliver 250-mA peak current to trigger external high-power SCRs |
| 15 | GND | Power ground reference - common return for all analog and digital circuitry |
| 16 | VCC | Positive supply input - powers internal circuitry; must be ≥3.5 V for full functionality |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supervisors | Enables simultaneous monitoring of main 12-V rail and auxiliary low-voltage rail (e.g., 1.5-V logic) without external multiplexing |
| Programmable reset pulse duration | External capacitor (CT) sets delay time - eliminates need for discrete RC timers or firmware-based delays |
| 250-mA SCR gate drive | Directly triggers high-current SCRs for overvoltage crowbar protection - removes requirement for discrete transistor drivers |
| True + complementary reset outputs | Provides both active-low and active-high signals per channel - simplifies interface to diverse MCU/FPGA reset architectures |
| Temperature-compensated reference | Maintains stable 12-V threshold across 0°C–70°C - avoids calibration drift in industrial ambient conditions |
Applications
| Industrial PLC Power Sequencing | Telecom Line Card Protection |
|---|---|
Use Scenario: Ensures safe startup and shutdown of multi-rail PLC backplanes where 12-V analog I/O and 3.3-V logic must power up/down in strict order. IC Role / Device Role / Timing Role: TL7770-12CN supervises 12-V supply and a secondary rail (via 2VSU), asserting synchronized reset until both reach valid levels and remain stable for user-defined td. Use Value: Prevents metastability and latch-up in mixed-voltage PLC modules by guaranteeing clean, timed reset release aligned with actual rail stability - not just nominal voltage crossing. | Use Scenario: Protects telecom line cards from overvoltage transients on -48-V DC distribution buses during lightning-induced surges or hot-swap events. IC Role / Device Role / Timing Role: TL7770-12CN senses overvoltage at VSO and triggers its 250-mA SCR drive output to activate an external crowbar SCR, shorting the bus and blowing upstream fuses within microseconds. Use Value: Achieves sub-10 µs fault response without external comparators or gate drivers - reducing BOM count and PCB area in space-constrained line card designs. |
| Medical Diagnostic Equipment | Automotive Body Control Module |
Use Scenario: Monitors critical 12-V battery-derived rails powering imaging sensors and ADCs in portable ultrasound devices where brownout resilience is mandatory. IC Role / Device Role / Timing Role: TL7770-12CN asserts RESET when VCC drops below 1 V during battery sag, holding microcontroller in reset until 12-V rail recovers above 10.68 V and remains stable for td. Use Value: Guarantees deterministic recovery from deep brownouts - eliminating corrupted sensor data acquisition or unsafe actuator commands due to partial MCU execution. | Use Scenario: Supervises 12-V ignition-switched supply and 5-V microcontroller core rail in BCMs, detecting undervoltage during cranking and overvoltage during load dump. IC Role / Device Role / Timing Role: TL7770-12CN uses 1VSU for 12-V monitoring and 2VSU for 5-V rail; its dual RESIN inputs allow coordinated reset initiation from CAN wake-up or ignition signal edges. Use Value: Enables single-chip dual-rail supervision with independent timing - replacing two discrete supervisors and reducing layout complexity in cost-sensitive automotive modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL7705CN | Single-channel 5-V supervisor; no SCR drive; no programmable CT; only one VSU/VSO pair | Lacks dual-channel capability and overvoltage crowbar function - suitable only for basic 5-V reset generation | Select only if application requires only 5-V monitoring and no overvoltage protection |
| TPS3619-50DBVR | Single-channel, 5-V fixed threshold; no SCR drive; SOT-23-5 package; no CT adjustment | Smaller footprint but no dual sensing, no overvoltage response, and no timing flexibility - limited to simple reset-only use cases | Choose for space-constrained designs needing only basic 5-V reset, not dual-rail or SCR-triggered protection |
Compared with TL7770-12CN, TL7705CN provides simpler 5-V supervision but omits dual-channel operation and SCR drive, while TPS3619-50DBVR offers ultra-small packaging at the cost of losing programmable timing, overvoltage response, and 12-V capability - making TL7770-12CN uniquely suited for robust dual-rail industrial protection.
Availability
TL7770-12CN is available at Aetrix Electronics and suitable for industrial PLC power sequencing, telecom line card protection, medical diagnostic equipment, automotive body control modules, and legacy system upgrades requiring stable component supply with long-term obsolescence management.
Supply support for TL7770-12CN 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 for industrial, automotive, and communications markets.
The TL7770 family was developed specifically for high-reliability power-supply supervision in microcomputer systems, emphasizing dual-rail monitoring, SCR-based overvoltage protection, and field-programmable reset timing - targeting industrial control and telecom infrastructure.
FAQ
What is the undervoltage detection threshold for TL7770-12CN at the 1VSU pin?
The TL7770-12CN has a factory-trimmed undervoltage threshold of 10.68 V to 11.12 V at the 1VSU pin, optimized for reliable 12-V supply monitoring with 36 mV hysteresis to prevent false triggering during marginal voltage conditions. This specification is guaranteed across the 0°C to 70°C operating range and is documented in the SLVS019F datasheet electrical characteristics table.
Can TL7770-12CN drive an external SCR directly without additional components?
Yes, TL7770-12CN can drive an external SCR gate directly using its dedicated SCR DRIVE output, which delivers up to 250-mA peak current and 25-mA continuous current - sufficient to trigger most power SCRs used in crowbar protection circuits. No external transistor or driver stage is required, as confirmed by the functional block diagram and absolute maximum ratings in the TL7770-12CN datasheet.
How is the reset pulse duration controlled in TL7770-12CN?
The reset pulse duration in TL7770-12CN is controlled by an external timing capacitor (CT) connected to either 1CT or 2CT pin, with duration calculated as td ≈ 20 × 10³ × C (in seconds, with C in farads). This allows field-adjustable reset hold times from microseconds to seconds, eliminating fixed-timing dependencies and enabling design-specific reliability tuning per channel.
Does TL7770-12CN provide both true and complementary reset outputs?
Yes, TL7770-12CN provides both true active-low (1RESET/2RESET) and complementary active-high (1RESET/2RESET) reset outputs for each of its two independent channels. These outputs are electrically isolated and can drive different logic families or be wire-OR'd, as shown in the functional block diagram and pin description section of the TL7770-12CN datasheet.
What package type and lead finish does TL7770-12CN use?
TL7770-12CN uses a 16-pin plastic dual in-line package (PDIP-N) with through-hole leads finished in matte tin (NIPDAU), RoHS-compliant, and rated for 0°C to 70°C operation. The package outline, dimensions, and tape-and-reel information are specified in TI's DW/N package addendum documents dated March 2026.
TL7770-12CN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TL7770-12CN FAQ
1.How can I place an order for TL7770-12CN through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7770-12CN 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 TL7770-12CN reliable?
The price and inventory of TL7770-12CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7770-12CN is usually 5 days.
3.What payment methods are accepted for TL7770-12CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7770-12CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7770-12CN?
TL7770-12CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7770-12CN 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 TL7770-12CN?
For technical support, including TL7770-12CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7770-12CN requirements.
6.How does Aetrix verify that TL7770-12CN is sourced from the original manufacturer or authorized distributors?
All TL7770-12CN 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 TL7770-12CN meets industry standards.
7.What is the process for return or replacement of TL7770-12CN?
All TL7770-12CN units undergo pre-shipment inspection (PSI). If there is an issue with TL7770-12CN, 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 TL7770-12CN part is unused and in its original packaging.
Return procedure for TL7770-12CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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