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Texas Instruments TL7770-5CDWR
- Part No.:
- TL7770-5CDWR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TL7770-5CDWR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,059
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Product details
Overview
TL7770-5CDWR from Texas Instruments is a dual-channel power-supply supervisor IC designed for microcomputer and microprocessor systems requiring precise undervoltage/overvoltage monitoring and SCR-based overvoltage protection. It features two independent voltage-sense channels (1VSU/2VSU and 1VSO/2VSO), 5-V and programmable undervoltage thresholds (4.46 V and 1.47 V typ), 250-mA peak SCR gate drive, and true/complementary reset outputs with externally adjustable pulse duration via CT capacitor.
For engineers reviewing the TL7770-5CDWR datasheet, TL7770-5CDWR pinout, TL7770-5CDWR application, or TL7770-5CDWR equivalent, this device supports critical power-up sequencing, brownout recovery, and high-current overvoltage fault response in industrial control, telecom power supplies, and embedded instrumentation where dual-rail supervision and SCR-triggered shutdown are required.
Technical Context
The TL7770-5CDWR implements two independent analog comparators per channel - one for undervoltage detection at VSU (with hysteresis of 15 mV for 5-V sense) and one for overvoltage detection at VSO (threshold 2.48–2.68 V). Each channel includes a precision temperature-compensated voltage reference and internal timing circuitry that latches RESET/RESET outputs for a capacitor-defined delay (td ≈ 20×10³ × C) after VCC exceeds 1 V and system voltages stabilize above 3.5 V.
Its SCR DRIVE terminals deliver 250-mA peak current for triggering external high-current SCRs during overvoltage events, while maintaining 2-mA active-low gate drive to prevent false triggering. The device operates across 3.5–18 V supply range and is characterized for 0°C to 70°C ambient temperature, with SOIC-16 (DW) package and RoHS-compliant NIPDAU lead finish.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 3.5 V to 18 V - supports wide-input industrial and telecom power rails without external regulation |
| Undervoltage threshold (1VSU) | 4.46 V (min), 4.64 V (typ) - precisely monitors 5-V system rail for brownout detection |
| Undervoltage threshold (2VSU) | 1.47 V (min), 1.53 V (typ) - enables programmable low-voltage sensing for auxiliary or logic rails |
| Overvoltage threshold (VSO) | 2.48 V to 2.68 V - triggers SCR gate drive when sensed voltage exceeds safe limit |
| SCR DRIVE peak current | 250 mA - sufficient to directly trigger high-current external SCRs for overvoltage crowbar |
| Reset output drive | 16 mA sink / –16 mA source - drives standard TTL/CMOS reset inputs without buffering |
| Operating temperature | 0°C to 70°C - qualified for commercial-grade industrial equipment and embedded controllers |
Pinout & Package
TL7770-5CDWR is housed in a 16-pin SOIC (DW) package, 7.5 mm × 10.3 mm body size, 1.27 mm pitch, maximum height 2.65 mm, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1RESIN, 2RESIN | Manual reset input | Active-low inputs to force time-delayed reset assertion during normal operation |
| 1CT, 2CT | Timing capacitor connection | External capacitor sets reset pulse duration (td = 20×10³ × C); requires series resistor RT when VCC and VSU share node |
| 1RESET, 2RESET | True reset output | Active-low open-collector output; sinks 16 mA; used for MCU/system reset assertion |
| 1RESET, 2RESET | Complementary reset output | Active-high push-pull output; sources –16 mA; provides inverted reset signal for logic interface |
| 1VSU, 2VSU | Undervoltage sense input | Dual independent inputs for monitoring 5-V (1VSU) and programmable (2VSU) supply rails |
| 1VSO, 2VSO | Overvoltage sense input | Dual inputs for detecting overvoltage on respective rails; internally referenced to 2.58 V nominal |
| 1SCR DRIVE, 2SCR DRIVE | SCR gate driver output | High-current output delivering 250-mA peak to trigger external SCRs during overvoltage faults |
| VCC | Power supply input | Main supply pin; powers internal circuitry and defines operating range (3.5–18 V) |
| GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supervisors | Enables simultaneous monitoring of primary (5-V) and secondary (programmable) rails without external components |
| Externally adjustable reset pulse | Capacitor-controlled delay (td) allows precise tuning of reset hold time to match system boot requirements |
| 250-mA SCR gate drive | Eliminates need for discrete transistor driver stage when implementing overvoltage crowbar protection |
| True + complementary reset outputs | Provides both active-low and active-high reset signals for direct interfacing with diverse MCU and logic families |
| Temperature-compensated reference | Maintains stable 5-V and 1.5-V threshold accuracy across 0°C–70°C, reducing calibration overhead |
Applications
| Industrial PLC Power Management | Telecom Line Card Supervision |
|---|---|
Use Scenario: Monitors dual DC rails (5 V and 3.3 V) in programmable logic controller backplanes to detect brownout and initiate controlled shutdown before data corruption. IC Role / Device Role / Timing Role: TL7770-5CDWR acts as dual-rail supervisor with independent VSU inputs; asserts synchronized RESET/RESET pulses upon undervoltage event, holding CPU in reset until both rails recover. Use Value: Prevents erratic behavior during partial power loss by ensuring deterministic reset timing and eliminating race conditions between rail recoveries. | Use Scenario: Supervises ±12 V and +5 V supplies in telecom line cards, triggering SCR-based crowbar on overvoltage to protect sensitive transceivers and FPGAs. IC Role / Device Role / Timing Role: TL7770-5CDWR uses VSO inputs to detect overvoltage on either rail; activates 250-mA SCR DRIVE output to fire external SCR, shorting supply to ground within microseconds. Use Value: Achieves sub-10 µs fault response without external comparator or driver, meeting GR-1089-CORE surge immunity requirements. |
| Embedded Instrumentation Reset Control | Motor Drive Controller Power Sequencing |
Use Scenario: Ensures reliable startup of ARM-based measurement instruments by validating 5-V analog supply and 3.3-V digital supply before releasing reset to processor and ADC. IC Role / Device Role / Timing Role: TL7770-5CDWR configures 1VSU for 5-V rail and 2VSU for 3.3-V rail; generates extended reset pulse (via 10 µF CT) to accommodate slow-start LDOs and crystal oscillator stabilization. Use Value: Guarantees full power rail stability prior to firmware execution, eliminating boot failures caused by marginal supply ramp rates. | Use Scenario: Coordinates power-up sequence of gate drivers, isolation amplifiers, and MCU in servo motor drives, preventing shoot-through during initial energization. IC Role / Device Role / Timing Role: TL7770-5CDWR monitors main DC bus (1VSU) and isolated logic supply (2VSU); asserts RESET only after both exceed thresholds and remain stable for capacitor-defined delay. Use Value: Enforces strict sequencing dependency - logic power must stabilize before gate drivers receive enable - reducing risk of MOSFET failure during commissioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-01DBVR | Single-channel, fixed 3.08-V reset threshold; no SCR drive; 200-ms fixed timeout | Lacks dual-rail monitoring and overvoltage crowbar capability; suitable only for basic single-rail reset | Select when only one supply rail requires supervision and SCR protection is unnecessary |
| MAX6822MUT+T | Dual-channel, but no SCR drive; 2.93-V/4.63-V thresholds; 140-ms fixed timeout; SOT-23-6 | Smaller footprint but missing overvoltage response and adjustable timing; limited to low-power applications | Choose for space-constrained designs where overvoltage protection is handled separately |
Compared with TL7770-5CDWR, TPS3823-01DBVR offers simpler integration for single-rail systems but omits dual supervision and SCR triggering, while MAX6822MUT+T provides compact dual monitoring yet lacks the 250-mA fault-current capability essential for robust overvoltage protection in high-power industrial environments.
Availability
TL7770-5CDWR is available at Aetrix Electronics and suitable for industrial PLC power management, telecom line card supervision, and embedded instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for TL7770-5CDWR 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, specializing in analog, embedded processing, and power management technologies with over 90 years of innovation in industrial and automotive electronics.
The TL7770 family was developed specifically for high-reliability power-supply supervision in microcomputer systems, emphasizing dual-rail monitoring, programmable timing, and integrated SCR-driven overvoltage protection for mission-critical industrial infrastructure.
FAQ
What is the function of the RESIN pins on the TL7770-5CDWR?
The 1RESIN and 2RESIN pins on the TL7770-5CDWR are active-low manual reset inputs. When pulled low, they initiate the time-delayed reset sequence - asserting 1RESET/2RESET for a duration set by the external CT capacitor - even when supply voltages are within specification. This allows external microcontrollers or pushbuttons to force a controlled system reset without power cycling. The TL7770-5CDWR interprets a logic-low level below 0.8 V as valid assertion.
How does the TL7770-5CDWR generate its reset pulse duration?
The TL7770-5CDWR generates reset pulse duration using an external timing capacitor (CT) connected to the 1CT and 2CT pins. The delay time (td) follows td ≈ 20 × 10³ × C, where C is in farads and td is in seconds. For example, a 10 µF capacitor yields ~200 ms. A series resistor (RT) is recommended between CT and the supervisor terminal when VCC and VSU are tied together to prevent timing error due to leakage. The TL7770-5CDWR's internal circuitry charges this capacitor to define the hold time.
Can the TL7770-5CDWR monitor both 5-V and 12-V rails simultaneously?
Yes - the TL7770-5CDWR supports dual-rail monitoring: 1VSU is factory-configured for 5-V undervoltage detection (4.46–4.64 V threshold), while 2VSU is programmable for lower thresholds (1.47–1.53 V typical), allowing flexible adaptation to auxiliary rails. However, it does not natively support 12-V sensing; for 12-V monitoring, the TL7770-12CDWR variant is specified with 10.68–11.12 V threshold at 1VSU. The TL7770-5CDWR itself is optimized for 5-V primary rail supervision paired with a secondary low-voltage rail.
What is the purpose of the SCR DRIVE output on the TL7770-5CDWR?
The SCR DRIVE output on the TL7770-5CDWR delivers up to 250-mA peak current to trigger an external silicon-controlled rectifier (SCR) during overvoltage events detected at VSO inputs. This enables fast-acting crowbar protection - shorting the supply rail to ground - to safeguard downstream circuitry. Unlike standard reset outputs, SCR DRIVE remains active only during fault conditions and includes 2-mA active-low drive to suppress false triggering. The TL7770-5CDWR integrates this function to eliminate discrete SCR driver stages.
Is the TL7770-5CDWR pin-compatible with other members of the TL7770 family?
Yes - the TL7770-5CDWR shares identical SOIC-16 (DW) pinout and electrical interface with all TL7770 variants including TL7770-12CDWR, TL7770-5CN, and TL7770-5IDWR. All variants use the same pin assignments for RESIN, RESET, VSU, VSO, SCR DRIVE, CT, VCC, and GND. Differences lie solely in internal resistor networks (defining voltage thresholds) and temperature grade (C vs I), making them drop-in replacements for layout reuse - provided the application's voltage-sensing requirements align with the selected variant's thresholds.
TL7770-5CDWR 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
TL7770-5CDWR FAQ
1.How can I place an order for TL7770-5CDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7770-5CDWR 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 TL7770-5CDWR reliable?
The price and inventory of TL7770-5CDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7770-5CDWR is usually 5 days.
3.What payment methods are accepted for TL7770-5CDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7770-5CDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7770-5CDWR?
TL7770-5CDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7770-5CDWR 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 TL7770-5CDWR?
For technical support, including TL7770-5CDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7770-5CDWR requirements.
6.How does Aetrix verify that TL7770-5CDWR is sourced from the original manufacturer or authorized distributors?
All TL7770-5CDWR 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 TL7770-5CDWR meets industry standards.
7.What is the process for return or replacement of TL7770-5CDWR?
All TL7770-5CDWR units undergo pre-shipment inspection (PSI). If there is an issue with TL7770-5CDWR, 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 TL7770-5CDWR part is unused and in its original packaging.
Return procedure for TL7770-5CDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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