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Texas Instruments TL7770-5IDW
- Part No.:
- TL7770-5IDW
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TL7770-5IDW.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,160
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Product details
Overview
TL7770-5IDW from Texas Instruments is a dual-channel power-supply supervisor IC designed for microcomputer/microprocessor reset control, featuring independent 5-V undervoltage sensing (1VSU), programmable overvoltage detection (VSO), true/complementary reset outputs (1RESET/1RESET), 250-mA peak SCR gate drive, and operation across –40°C to 85°C.
For engineers reviewing the TL7770-5IDW datasheet, TL7770-5IDW pinout, TL7770-5IDW application, or TL7770-5IDW equivalent, this device supports precision dual-supply monitoring in industrial embedded systems requiring robust power-on reset, fault-triggered SCR latching, and externally adjustable reset pulse duration via timing capacitor CT.
Technical Context
The TL7770-5IDW integrates two independent voltage supervisors: Channel 1 monitors a fixed 5-V supply at 1VSU (VIT+ = 4.46 V typ, hysteresis = 15 mV), while Channel 2 supports programmable undervoltage sensing at 2VSU (VIT– = 1.47–1.53 V) and overvoltage detection at 2VSO (VT = 2.48–2.68 V). Each channel provides RESIN-triggered time-delayed reset with external CT-based pulse width control.
It employs temperature-compensated bandgap reference circuitry, delivers 2-mA active-low SCR gate drive for false-trigger immunity, and asserts RESET when VCC exceeds 1 V (min), enabling reliable power-up initialization. The device sustains 25-mA continuous SCR drive current and operates across 3.5 V to 18 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.5 V to 18 V - supports wide-input industrial power rails without external regulation |
| Undervoltage Threshold (1VSU) | 4.46 V (typ) - precise 5-V rail monitoring with ±1.5% tolerance over temperature |
| Overvoltage Threshold (VSO) | 2.48 V to 2.68 V - programmable trip point for external overvoltage protection circuits |
| SCR Drive Peak Current | 250 mA - sufficient to trigger high-current external SCRs during overvoltage faults |
| Reset Activation Voltage | 1 V (min) - ensures early assertion of RESET before microcontroller core logic becomes unstable |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments without derating |
| Timing Capacitor Range | 10 µF max - sets reset pulse duration (td ≈ 20×10³ × C) for system-level hold-off timing |
Pinout & Package
TL7770-5IDW is housed in a 16-pin SOIC (DW) package, 7.5 mm × 10.3 mm body, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1RESIN, 2RESIN | Reset Input Control | Active-low inputs that initiate time-delayed reset assertion during normal operation |
| 1RESET, 2RESET | True Reset Output | Open-collector, low-active outputs synchronized to VSU/VSO thresholds and RESIN triggers |
| 1RESET, 2RESET | Complementary Reset Output | Push-pull, high-active counterparts to 1RESET/2RESET for direct interface with logic inputs |
| 1VSU, 2VSU | Undervoltage Sense Input | Dual independent inputs: 1VSU fixed for 5-V monitoring; 2VSU programmable for custom threshold |
| 1VSO, 2VSO | Overvoltage Sense Input | Inputs for external resistor-divider networks to set overvoltage trip points per channel |
| 1SCR DRIVE, 2SCR DRIVE | SCR Gate Driver Output | High-current outputs delivering 250-mA peak to trigger external silicon-controlled rectifiers |
| 1CT, 2CT | Timing Capacitor Terminal | Connects external capacitor to set reset pulse duration (td = 20×10³ × C seconds) |
| VCC | Power Supply Input | Main supply input (3.5–18 V); powers internal circuitry and enables RESET assertion above 1 V |
| GND | Ground Reference | Common return path for all analog and digital functions; required for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent Supervision Channels | Enables simultaneous monitoring of primary (5-V) and auxiliary (programmable) supplies without cross-coupling |
| Externally Adjustable Reset Pulse Duration | CT-based timing allows precise system-level reset hold-off (e.g., 100 ms to 10 s) without firmware dependency |
| 250-mA Peak SCR Gate Drive | Directly triggers high-power external SCRs for overvoltage crowbar protection, eliminating discrete driver stages |
| 2-mA Active-Low SCR Gate Drive | Reduces false triggering by ensuring SCR remains off unless both overvoltage condition and drive signal align |
| True and Complementary Reset Outputs | Provides native compatibility with both active-low and active-high reset inputs on diverse microcontrollers and FPGAs |
| Temperature-Compensated Voltage Reference | Maintains ±1.5% threshold accuracy across –40°C to +85°C, critical for unattended industrial deployments |
Applications
| Industrial PLC Power Management | Telecom Line Card Supervision |
|---|---|
|
Use Scenario: Monitoring dual DC rails (5 V logic + 12 V I/O) in programmable logic controllers subject to brownouts and surges. IC Role / Device Role / Timing Role: TL7770-5IDW independently supervises each rail, asserts reset on undervoltage, and triggers SCR crowbar on overvoltage. Use Value: Prevents corrupted state transitions during power anomalies and enables automatic hardware-level fault containment. |
Use Scenario: Ensuring clean boot sequencing and fault response in carrier-grade line cards with multiple isolated power domains. IC Role / Device Role / Timing Role: TL7770-5IDW provides synchronized reset to DSPs/FPGAs while driving external SCRs to disconnect faulty line interfaces. Use Value: Eliminates need for discrete comparators, timers, and SCR drivers-reducing BOM count and board area by >40%. |
| Motor Drive Controller Safety Monitoring | Medical Diagnostic Equipment Power Integrity |
|
Use Scenario: Detecting bus voltage collapse or overvoltage in servo amplifier modules where failure could damage motors or sensors. IC Role / Device Role / Timing Role: TL7770-5IDW channels monitor DC link and control supply, asserting reset and initiating SCR-based shutdown within microseconds. Use Value: Meets IEC 61800-5-2 functional safety requirements for hardware-initiated safe torque off (STO) sequences. |
Use Scenario: Guaranteeing deterministic reset behavior in portable ultrasound or imaging devices operating from battery + adapter inputs. IC Role / Device Role / Timing Role: TL7770-5IDW ensures microcontroller resets only after stable 5-V rail is established and maintains reset during transient dips. Use Value: Avoids data corruption or unintended actuation during battery swap or AC adapter disconnect events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3619-50DBVR | Single-channel, fixed 5-V supervisor; no SCR drive; 200-ms factory-fixed delay; no programmable overvoltage sense | Lacks dual-channel independence and overvoltage-triggered crowbar capability; suitable only for basic reset-only use cases | Select when SCR protection is unnecessary and board space constraints preclude dual discrete supervisors |
| MAX6822TUT+T | Single-channel, 5-V supervisor with watchdog timer; no SCR output; 1.6-V min VCC; no programmable VSO | Includes watchdog functionality but omits overvoltage detection and dual-rail supervision; lower supply voltage support | Choose when system requires periodic software sanity checks alongside reset, not hardware fault containment |
Compared with TL7770-5IDW, TPS3619-50DBVR reduces integration by removing SCR drive and second channel, while MAX6822TUT+T trades dual-supply monitoring for watchdog capability-neither replicates the TL7770-5IDW's combined overvoltage-triggered crowbar and dual independent reset generation.
Availability
TL7770-5IDW is available at Aetrix Electronics and suitable for industrial PLC power management, telecom line card supervision, and motor drive controller safety monitoring requiring stable component supply across extended temperature ranges.
Supply support for TL7770-5IDW 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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of industrial-grade reliability validation.
The TL7770 family was engineered specifically for high-reliability power-supply supervision in microcomputer systems, emphasizing dual-rail monitoring, hardware-based fault response, and SCR-driven overvoltage protection.
FAQ
What is the minimum VCC voltage required for TL7770-5IDW to assert RESET?
The TL7770-5IDW asserts RESET when VCC exceeds 1 V (minimum), enabling early reset activation before microcontroller core logic becomes operational. This threshold is guaranteed across –40°C to +85°C and ensures deterministic power-on behavior even during slow-ramp or brownout conditions. The TL7770-5IDW does not function below 1 V, entering undefined operation per absolute maximum ratings.
How does the TL7770-5IDW generate its reset pulse duration?
The TL7770-5IDW uses an external timing capacitor (CT) connected to pins 1CT and 2CT to set reset pulse width: td ≈ 20 × 10³ × C seconds, where C is in farads. For example, a 1-µF capacitor yields ~20 ms pulse duration. The TL7770-5IDW datasheet specifies CT up to 10 µF, supporting pulses from milliseconds to tens of seconds without software intervention.
Can TL7770-5IDW monitor both 5-V and 12-V supplies simultaneously?
Yes - TL7770-5IDW has two independent channels: Channel 1 (1VSU) is factory-configured for 5-V undervoltage detection (VIT+ = 4.46 V), while Channel 2 (2VSU) supports programmable undervoltage sensing and 2VSO enables overvoltage detection for a second rail such as 12 V. The TL7770-5IDW achieves true dual-rail supervision without shared thresholds or timing dependencies.
What is the purpose of the 2-mA active-low SCR drive specification in TL7770-5IDW?
The 2-mA active-low SCR drive in TL7770-5IDW prevents false triggering by holding the SCR gate in a known low state until an overvoltage event occurs and the internal SCR is enabled. This design ensures the external SCR remains fully off during normal operation, eliminating spurious crowbar activation due to noise or transients - a key reliability feature confirmed in TI's SLVS019F datasheet.
Is TL7770-5IDW pin-compatible with TL7770-5CDW?
Yes - TL7770-5IDW and TL7770-5CDW share identical DW (SOIC-16) package dimensions, pinout, and electrical interface. The only difference is temperature rating: TL7770-5IDW is specified for –40°C to +85°C, while TL7770-5CDW is rated for 0°C to +70°C. All timing, threshold, and drive specifications remain functionally identical across both variants, making TL7770-5IDW a direct drop-in replacement in extended-temperature designs.
TL7770-5IDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 5V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 270ns Typical Propagation Delay
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
TL7770-5IDW FAQ
1.How can I place an order for TL7770-5IDW through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7770-5IDW 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 TL7770-5IDW reliable?
The price and inventory of TL7770-5IDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7770-5IDW is usually 5 days.
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TL7770-5IDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7770-5IDW 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 TL7770-5IDW?
For technical support, including TL7770-5IDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7770-5IDW requirements.
6.How does Aetrix verify that TL7770-5IDW is sourced from the original manufacturer or authorized distributors?
All TL7770-5IDW 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 TL7770-5IDW meets industry standards.
7.What is the process for return or replacement of TL7770-5IDW?
All TL7770-5IDW units undergo pre-shipment inspection (PSI). If there is an issue with TL7770-5IDW, 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 TL7770-5IDW part is unused and in its original packaging.
Return procedure for TL7770-5IDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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