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Texas Instruments TL7770-5IDWR
- Part No.:
- TL7770-5IDWR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TL7770-5IDWR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,042
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Product details
Overview
TL7770-5IDWR from Texas Instruments is a dual-channel power-supply supervisor IC designed for microcomputer/microprocessor reset control. It provides independent overvoltage and undervoltage monitoring on two supply rails (VSU/VSO), features true/complementary RESET outputs, 250-mA peak SCR gate drive, and operates across 3.5 V to 18 V supply range with –40°C to 85°C industrial temperature rating.
For engineers reviewing the TL7770-5IDWR datasheet, TL7770-5IDWR pinout, TL7770-5IDWR application, or TL7770-5IDWR equivalent, key selection considerations include its dual-threshold sensing architecture, externally adjustable reset pulse duration via timing capacitor, precision undervoltage thresholds (4.46 V/10.68 V nominal), SCR-triggering capability, and SOIC-16 package compatibility with industrial-grade thermal performance.
Technical Context
The TL7770-5IDWR implements two independent voltage-monitoring channels: Channel 1 (1VSU/1VSO) is factory-configured for 5-V undervoltage detection (VIT+ = 4.46 V) and programmable overvoltage sensing; Channel 2 (2VSU/2VSO) supports adjustable undervoltage threshold down to 1.47 V and fixed overvoltage trip at 2.48 V. Each channel includes dedicated RESIN input, CT timing terminal, and complementary RESET/RESET outputs.
Its internal architecture integrates a temperature-compensated voltage reference, precision comparator network, time-delay latch, and high-current SCR driver stage capable of 250-mA peak output. Reset activation occurs when VCC exceeds 1 V, and latched reset duration is determined by external CT capacitance per td ≈ 20 × 10³ × C (seconds).
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 (min) - precise 5-V rail monitoring with 15 mV hysteresis for noise immunity |
| Overvoltage Threshold (VSO) | 2.48 V (min) - fixed trigger point enabling external resistor-divider programming for custom OV levels |
| SCR Drive Output | 250-mA peak / 25-mA continuous - directly drives high-current external SCRs for overvoltage fault shutdown |
| Reset Output Drive | ±16 mA - sufficient sink/source current to interface with TTL/CMOS logic without buffer stages |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including automotive under-hood applications |
| Timing Capacitor Range | 10 µF max - sets reset pulse width via RC network; enables configurable delay from microseconds to seconds |
Pinout & Package
TL7770-5IDWR is housed in a 16-pin SOIC (DW) package measuring 10.3 mm × 7.5 mm × 2.65 mm, with 1.27-mm lead pitch and RoHS-compliant NiPdAu finish. The package is rated MSL Level-1 (unlimited floor life) and compatible with standard reflow profiles up to 260°C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | 1RESIN / 2RESIN | Active-low manual reset inputs - initiate time-delayed reset independently per channel |
| 3, 4 | 1CT / 2CT | Timing capacitor connections - set reset pulse duration via external capacitor (td ≈ 20×10³×C) |
| 5, 6 | 1RESET / 2RESET | Active-low reset outputs - drive microcontroller reset pins directly with 16-mA sink capability |
| 7, 8 | 1RESET / 2RESET | Complementary active-high reset outputs - provide inverted logic for mixed-signal system interfacing |
| 9, 10 | 1VSU / 2VSU | Undervoltage sense inputs - monitor supply rails for brownout conditions with factory-trimmed thresholds |
| 11, 12 | 1VSO / 2VSO | Overvoltage sense inputs - enable programmable OV protection using external resistor dividers |
| 13, 14 | 1SCR DRIVE / 2SCR DRIVE | SCR gate drive outputs - deliver 250-mA peak current to trigger external high-power SCRs during OV faults |
| 15 | GND | Power ground reference - common return path for all analog and digital circuitry |
| 16 | VCC | Positive supply input - powers internal circuitry and defines operating voltage range (3.5–18 V) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supervisors | Enables simultaneous monitoring of primary and auxiliary rails (e.g., 5 V + 12 V) with separate reset timing |
| True/complementary RESET outputs | Eliminates need for external inverters when interfacing with both active-low and active-high reset domains |
| 250-mA SCR gate drive | Directly triggers high-current SCRs for fail-safe overvoltage shutdown without discrete driver transistors |
| Externally adjustable reset pulse | Capacitor-programmable delay ensures reliable processor initialization across varying power-up slopes |
| Temperature-compensated reference | Maintains ±1.5% threshold accuracy over –40°C to +85°C, critical for stable operation in harsh environments |
Applications
| Industrial PLC Power Management | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring dual supply rails (5 V logic + 12 V I/O) in programmable logic controllers during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-channel supervisor providing synchronized reset assertion and SCR-triggered shutdown upon undervoltage or overvoltage faults. Use Value: Prevents firmware corruption during unstable battery conditions by enforcing minimum VCC > 1 V before releasing reset and initiating SCR-based rail isolation. | Use Scenario: Protecting microcontroller subsystems in vehicle body electronics exposed to ISO 7637-2 transient surges and battery voltage fluctuations. IC Role / Device Role / Timing Role: Overvoltage supervisor triggering external SCR to disconnect sensitive 5-V domain during 24-V load dump events. Use Value: Achieves sub-100-ns fault response via direct SCR drive, eliminating reliance on slower microcontroller-based software protection. |
| Telecom Power Shelf Controller | Medical Diagnostic Equipment |
Use Scenario: Ensuring clean startup of multi-rail power supplies in telecom line cards where 3.3 V, 5 V, and ±12 V must sequence correctly. IC Role / Device Role / Timing Role: Independent VSU monitoring per rail with programmable reset hold-off to accommodate staggered power-up timing. Use Value: Guarantees processor reset remains asserted until all monitored rails exceed their respective VIT+ thresholds and stabilize for td duration. | Use Scenario: Safeguarding FPGA-based imaging subsystems in portable ultrasound devices operating from Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Undervoltage supervisor detecting battery sag below 4.46 V and asserting reset to halt data acquisition before memory corruption occurs. Use Value: Leverages factory-trimmed 15-mV hysteresis to reject noise-induced false resets during motor-driven transducer pulsing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single-channel, 3.3-V fixed threshold, no SCR drive, lower quiescent current (1.5 µA) | Lacks dual-rail monitoring and overvoltage-triggered SCR shutdown capability | Select when only basic 3.3-V reset is required and ultra-low power dominates design priorities |
| MAX6816ESE+ | Single-channel, 5-V fixed threshold, integrated debounced pushbutton interface, no OV/UV programmability | Designed for manual reset systems rather than autonomous supply monitoring with fault shutdown | Choose for human-initiated reset applications where supply supervision is secondary to switch interface functionality |
Compared with TL7770-5IDWR, the TPS3808G33DBVR offers superior power efficiency but sacrifices dual-channel autonomy and SCR-based overvoltage protection; the MAX6816ESE+ provides robust ESD-hardened manual reset handling yet omits programmable voltage thresholds and timing control essential for automated power-rail supervision.
Availability
TL7770-5IDWR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, telecom infrastructure, and medical device applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TL7770-5IDWR 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 decades of heritage in high-reliability industrial and automotive components.
The TL7770 series belongs to TI's legacy power-supply supervision product line, engineered specifically for robust reset control in microcomputer systems subject to voltage transients, brownouts, and overvoltage faults in demanding environments.
FAQ
What is the minimum VCC voltage required for TL7770-5IDWR to assert RESET?
The TL7770-5IDWR asserts RESET when VCC exceeds 1 V (typical), ensuring early reset activation during power-up before the microcontroller reaches operational voltage. This behavior is guaranteed across the full –40°C to +85°C operating range and forms the foundational power-on reset condition for the TL7770-5IDWR.
How does the TL7770-5IDWR generate its reset pulse duration?
The TL7770-5IDWR uses an external timing capacitor connected to the CT pin to set reset pulse width, calculated as td ≈ 20 × 10³ × C (seconds), where C is in farads. This RC-based timing allows designers to configure delays from microseconds to seconds without firmware involvement, a core functional attribute of the TL7770-5IDWR.
Can TL7770-5IDWR monitor both 5-V and 12-V rails simultaneously?
Yes - the TL7770-5IDWR contains two independent supervisor channels: Channel 1 (1VSU) is factory trimmed for 5-V undervoltage detection (4.46 V), while Channel 2 (2VSU) supports adjustable thresholds down to 1.47 V; combined with programmable VSO inputs, it enables concurrent monitoring of 5-V and 12-V rails using the same TL7770-5IDWR device.
What is the purpose of the SCR DRIVE output on TL7770-5IDWR?
The SCR DRIVE output on TL7770-5IDWR delivers 250-mA peak current to trigger external silicon-controlled rectifiers during overvoltage events, enabling hardware-level power rail shutdown independent of software. This feature is integral to the TL7770-5IDWR's fault-protection architecture and distinguishes it from basic reset supervisors.
Is TL7770-5IDWR pin-compatible with other TL7770 variants like TL7770-5CDWR?
Yes - TL7770-5IDWR shares identical SOIC-16 (DW) pinout, electrical characteristics, and functional behavior with TL7770-5CDWR, differing only in temperature grade (–40°C to +85°C vs. 0°C to +70°C) and marking. Both devices use the same PCB footprint and schematic symbol, making TL7770-5IDWR a direct drop-in replacement for extended-temperature applications.
TL7770-5IDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
TL7770-5IDWR FAQ
1.How can I place an order for TL7770-5IDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7770-5IDWR 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 TL7770-5IDWR reliable?
The price and inventory of TL7770-5IDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7770-5IDWR is usually 5 days.
3.What payment methods are accepted for TL7770-5IDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7770-5IDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7770-5IDWR?
TL7770-5IDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7770-5IDWR 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 TL7770-5IDWR?
For technical support, including TL7770-5IDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7770-5IDWR requirements.
6.How does Aetrix verify that TL7770-5IDWR is sourced from the original manufacturer or authorized distributors?
All TL7770-5IDWR 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 TL7770-5IDWR meets industry standards.
7.What is the process for return or replacement of TL7770-5IDWR?
All TL7770-5IDWR units undergo pre-shipment inspection (PSI). If there is an issue with TL7770-5IDWR, 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 TL7770-5IDWR part is unused and in its original packaging.
Return procedure for TL7770-5IDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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