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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Texas Instruments TL7770-12CDW

Name: TL7770-12CDW
Brand: Texas Instruments
SKU: TL7770-12CDW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TL7770-12CDW

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: TL7770-12CDW.pdf

Description:: IC SUPERVISOR 2 CHANNEL 16SOIC

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Product details

Overview

TL7770-12CDW from Texas Instruments is a dual-channel power-supply supervisor IC designed for microcomputer and microprocessor systems requiring precise 12-V undervoltage monitoring and overvoltage protection. It features independent VSU/ VSO inputs, true/complementary reset outputs (RESET/RESET), 250-mA peak SCR gate drive, and externally adjustable reset pulse duration via timing capacitor CT. It operates across 3.5 V to 18 V supply range with 0°C to 70°C temperature rating.

For engineers reviewing the TL7770-12CDW datasheet, TL7770-12CDW pinout, TL7770-12CDW application, or TL7770-12CDW equivalent, key selection considerations include its fixed 12-V undervoltage threshold (VIT+ = 10.68–11.12 V), programmable overvoltage sensing at VSO (2.48–2.68 V), dual-channel independence, SCR-drive capability for crowbar circuits, and SOIC-16 package compatibility with industrial power-up sequencing and fault-safe shutdown designs.

Technical Context

The TL7770-12CDW integrates two independent voltage supervisors: Channel 1 monitors a 12-V supply at 1VSU with ±15 mV hysteresis and triggers RESET when voltage drops below 10.68 V; Channel 2 provides programmable undervoltage sensing at 2VSU (1.47–1.53 V threshold) and overvoltage detection at 2VSO (2.48–2.68 V). Each channel includes RESIN-triggered time-delay latching and dedicated SCR DRIVE output capable of 250-mA peak current.

Reset activation begins at VCC ≥ 1 V, with full functionality enabled above 3.5 V. The device uses an internal temperature-compensated voltage reference and supports external timing capacitor (CT) values from 10 µF to set delay duration (td ≈ 20 × 10³ × CT seconds). Both RESET outputs remain active until VSU exceeds VIT+ for td after normal supply recovery.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.5 V to 18 V - supports wide-input industrial and automotive auxiliary rails without external regulation.
1VSU Undervoltage Threshold	10.68 V to 11.12 V - factory-trimmed for nominal 12-V rail supervision with 36 mV hysteresis to prevent chatter during brownout recovery.
VSO Overvoltage Threshold	2.48 V to 2.68 V - fixed internal comparator reference enabling external resistor-divider programming for custom overvoltage trip points.
SCR DRIVE Output	250-mA peak / 25-mA continuous - directly drives high-current SCRs for hardware-level overvoltage crowbar protection without external driver stages.
Reset Output Drive	±16 mA - sufficient to directly interface with TTL/CMOS microcontroller reset inputs or pull-up/pull-down networks without buffering.
Operating Temperature	0°C to 70°C - qualified for commercial-grade embedded control, instrumentation, and industrial power modules.
Timing Capacitor Range	10 µF - sets reset pulse duration (td) in seconds per td = 20 × 10³ × CT; enables precise system-level reset hold-time tuning.

Pinout & Package

TL7770-12CDW is housed in a 16-pin SOIC (DW) package with 1.27 mm pitch, RoHS-compliant green finish, and moisture sensitivity level (MSL) Level-1 (unlimited floor life at ≤30°C/60% RH).

Pin/Terminal	Circuit Role	Design Meaning
1RESIN, 2RESIN	Channel reset input	Active-low manual reset trigger; initiates time-delayed latch when pulled low during stable VCC operation.
1CT, 2CT	Timing capacitor connection	Connects external capacitor to set reset pulse duration; requires series resistor (RT) if tied to same node as VSU to avoid timing error.
1RESET, 2RESET	True reset output	Active-low open-collector output; sinks up to 16 mA; used for MCU/system reset assertion.
1RESET, 2RESET	Complementary reset output	Active-high push-pull output; sources up to 16 mA; provides inverted logic for direct enable/disable control.
1VSU, 2VSU	Undervoltage sense input	Monitors supply rail; 1VSU fixed for 12-V supervision; 2VSU programmable for secondary rail (e.g., 1.5-V core).
1VSO, 2VSO	Overvoltage sense input	Accepts resistor-divided voltage; triggers SCR DRIVE when input exceeds 2.48–2.68 V reference.
1SCR DRIVE, 2SCR DRIVE	SCR gate driver output	Delivers 250-mA peak current to fire external SCR; includes 2-mA active-low gate hold for false-trigger immunity.
GND	Ground reference	Common return for all analog and digital circuitry; must be low-impedance connection to minimize noise coupling.
VCC	Power supply input	Primary supply for internal circuitry; powers comparators, reference, and output drivers; minimum functional voltage is 1 V.

Key Features

Feature	Design Value
Dual independent supervisors	Enables simultaneous monitoring of primary (12-V) and auxiliary (e.g., 1.5-V) rails with separate reset outputs and timing controls.
Fixed 12-V undervoltage threshold	Eliminates external resistor divider for main supply monitoring, reducing BOM count and improving accuracy vs. discrete solutions.
Programmable overvoltage detection	Allows flexible crowbar configuration using standard resistor dividers-supports 5-V, 12-V, 24-V, or custom overvoltage trip points.
250-mA SCR gate drive	Directly fires high-current SCRs without external transistors, simplifying overvoltage protection circuitry and improving response speed.
True + complementary reset outputs	Provides both active-low and active-high signals to match diverse MCU reset architectures (e.g., ATmega vs. STM32) without level-shifting.
Externally adjustable reset pulse duration	Permits precise tailoring of reset hold time (from milliseconds to seconds) via single capacitor-critical for reliable boot sequence timing.

Applications

Industrial PLC Power Sequencing	Automotive Body Control Module
Use Scenario: Ensures safe startup and shutdown of multi-rail PLC controllers by verifying 12-V main supply and 3.3-V logic rail before enabling FPGA configuration and I/O drivers. IC Role / Device Role / Timing Role: TL7770-12CDW acts as dual-rail supervisor-1VSU monitors 12-V input while 2VSU monitors regulated 3.3-V output; generates synchronized reset pulses with user-defined hold time. Use Value: Prevents partial initialization and metastability by enforcing strict voltage sequencing and providing >100-ms reset assertion during brownout recovery.	Use Scenario: Protects vehicle body electronics (door locks, lighting, HVAC) from overvoltage transients on 12-V battery line caused by load dump or alternator surge. IC Role / Device Role / Timing Role: TL7770-12CDW senses overvoltage at 1VSO via resistor divider and triggers 1SCR DRIVE to fire external SCR, shorting battery to ground within microseconds. Use Value: Achieves hardware-level crowbar response (<1 µs latency) that clamps transient energy before downstream regulators or MCUs are damaged.
Medical Diagnostic Power Supply	Telecom Line Card Supervision
Use Scenario: Monitors isolated 12-V DC-DC converter output powering analog front-end circuitry in portable ultrasound devices where undervoltage could corrupt signal acquisition. IC Role / Device Role / Timing Role: TL7770-12CDW uses 1VSU to supervise 12-V rail and asserts 1RESET to halt ADC sampling and trigger firmware recalibration if voltage dips below 10.68 V. Use Value: Guarantees data integrity by forcing controlled shutdown before analog supply falls into non-linear operating region of op-amps and references.	Use Scenario: Provides fail-safe reset for DSP-based line cards in central office equipment, supervising both 3.3-V core and 12-V interface supplies under varying thermal and load conditions. IC Role / Device Role / Timing Role: TL7770-12CDW configures Channel 1 for 12-V supervision (1VSU) and Channel 2 for 3.3-V monitoring (2VSU); generates independent reset signals for each subsystem. Use Value: Enables modular fault isolation-failure in one rail resets only affected subsystem, preserving uptime of other line card functions.

Industrial PLC Power Sequencing

Automotive Body Control Module

Use Scenario: Ensures safe startup and shutdown of multi-rail PLC controllers by verifying 12-V main supply and 3.3-V logic rail before enabling FPGA configuration and I/O drivers.

IC Role / Device Role / Timing Role: TL7770-12CDW acts as dual-rail supervisor-1VSU monitors 12-V input while 2VSU monitors regulated 3.3-V output; generates synchronized reset pulses with user-defined hold time.

Use Value: Prevents partial initialization and metastability by enforcing strict voltage sequencing and providing >100-ms reset assertion during brownout recovery.

Use Scenario: Protects vehicle body electronics (door locks, lighting, HVAC) from overvoltage transients on 12-V battery line caused by load dump or alternator surge.

IC Role / Device Role / Timing Role: TL7770-12CDW senses overvoltage at 1VSO via resistor divider and triggers 1SCR DRIVE to fire external SCR, shorting battery to ground within microseconds.

Use Value: Achieves hardware-level crowbar response (<1 µs latency) that clamps transient energy before downstream regulators or MCUs are damaged.

Medical Diagnostic Power Supply

Telecom Line Card Supervision

Use Scenario: Monitors isolated 12-V DC-DC converter output powering analog front-end circuitry in portable ultrasound devices where undervoltage could corrupt signal acquisition.

IC Role / Device Role / Timing Role: TL7770-12CDW uses 1VSU to supervise 12-V rail and asserts 1RESET to halt ADC sampling and trigger firmware recalibration if voltage dips below 10.68 V.

Use Value: Guarantees data integrity by forcing controlled shutdown before analog supply falls into non-linear operating region of op-amps and references.

Use Scenario: Provides fail-safe reset for DSP-based line cards in central office equipment, supervising both 3.3-V core and 12-V interface supplies under varying thermal and load conditions.

IC Role / Device Role / Timing Role: TL7770-12CDW configures Channel 1 for 12-V supervision (1VSU) and Channel 2 for 3.3-V monitoring (2VSU); generates independent reset signals for each subsystem.

Use Value: Enables modular fault isolation-failure in one rail resets only affected subsystem, preserving uptime of other line card functions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL7705CDW	Single-channel 5-V supervisor; no overvoltage detection or SCR drive; lacks complementary reset output.	Suitable only for basic 5-V microcontroller reset; cannot replace TL7770-12CDW in dual-rail or crowbar applications.	Select only if system requires simple undervoltage reset on a single 5-V rail with no overvoltage protection or secondary monitoring.
TPS3619-50DBVR	Single-channel 5-V supervisor with watchdog timer; no SCR drive; fixed 200-ms reset pulse; no programmable timing capacitor.	Designed for microcontroller watchdog and reset, not for overvoltage crowbar or dual-rail coordination.	Choose when system needs integrated watchdog functionality and deterministic 200-ms reset pulse, but does not require dual-channel supervision or SCR triggering.

Compared with TL7770-12CDW, TL7705CDW offers lower integration and no overvoltage capability, while TPS3619-50DBVR adds watchdog timing but sacrifices dual-channel flexibility and SCR drive-making TL7770-12CDW uniquely suited for hardware-fault-tolerant dual-rail systems requiring crowbar protection.

Availability

TL7770-12CDW is available at Aetrix Electronics and suitable for industrial PLC power sequencing, automotive body control modules, medical diagnostic power supplies, and telecom line card supervision requiring stable component supply and long-term manufacturability.

Supply support for TL7770-12CDW 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 precision analog IC design and industrial-grade reliability.

The TL7770 family was developed specifically for robust power-supply supervision in microcomputer systems-emphasizing dual-rail monitoring, hardware-level overvoltage protection via SCR drive, and field-configurable reset timing for mission-critical embedded applications.

FAQ

What is the undervoltage threshold for TL7770-12CDW on the 1VSU pin?

The TL7770-12CDW has a factory-trimmed undervoltage threshold of 10.68 V to 11.12 V at the 1VSU pin, optimized for nominal 12-V supply monitoring. This threshold includes 36 mV hysteresis to prevent oscillation during slow voltage recovery. The specification applies across the full 0°C to 70°C operating range and is guaranteed per the SLVS019F datasheet revision July 1999.

Does TL7770-12CDW support overvoltage protection, and how is it implemented?

Yes, TL7770-12CDW implements overvoltage protection via its VSO inputs (1VSO and 2VSO), each referencing an internal 2.48–2.68 V comparator. When the divided input voltage exceeds this threshold, the corresponding SCR DRIVE output activates with 250-mA peak current to trigger an external SCR. This hardware crowbar action provides sub-microsecond response-far faster than software-based fault handling-and is confirmed in the functional block diagram and absolute maximum ratings section of the TL7770-12CDW datasheet.

Can TL7770-12CDW generate reset pulses of different durations for each channel?

Yes, TL7770-12CDW supports independent reset pulse duration control per channel using separate timing capacitors: 1CT for Channel 1 and 2CT for Channel 2. Pulse duration follows td ≈ 20 × 10³ × CT (seconds), allowing distinct hold times-for example, 200 ms for main CPU reset and 50 ms for peripheral initialization. The SLVS019F datasheet explicitly defines this relationship and confirms dual-capacitor configurability in Figure 4 and timing requirements tables.

What is the operating temperature range for TL7770-12CDW, and how is it designated?

TL7770-12CDW is rated for 0°C to 70°C operation and belongs to the TL7770C series, as indicated by the "C" suffix in the part number. This commercial-grade temperature range is validated per the recommended operating conditions table (page 4 of SLVS019F), where TA min/max are specified as 0°C and 70°C. The DW package variant is fully characterized across this range for parameters including VIT, Vhys, and ICC.

Is TL7770-12CDW pin-compatible with other TL7770 variants like TL7770-5CDW?

Yes, TL7770-12CDW is pin-compatible with TL7770-5CDW and all other TL7770x CDW variants-they share identical SOIC-16 (DW) package dimensions, pinout, and terminal functions. The only functional difference lies in the factory-trimmed undervoltage thresholds: TL7770-12CDW uses 10.68–11.12 V at 1VSU, while TL7770-5CDW uses 4.46–4.64 V. This allows drop-in replacement in layouts where the 1VSU resistor network matches the required threshold.

TL7770-12CDW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 16-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 2

Voltage - Threshold:: 12V, 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

TL7770-12CDW FAQ

1.How can I place an order for TL7770-12CDW through Aetrix?

Please submit a Request for Quotation (RFQ) for TL7770-12CDW 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 TL7770-12CDW reliable?

The price and inventory of TL7770-12CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7770-12CDW is usually 5 days.

3.What payment methods are accepted for TL7770-12CDW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7770-12CDW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TL7770-12CDW?

TL7770-12CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TL7770-12CDW 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 TL7770-12CDW?

For technical support, including TL7770-12CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7770-12CDW requirements.

6.How does Aetrix verify that TL7770-12CDW is sourced from the original manufacturer or authorized distributors?

All TL7770-12CDW 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 TL7770-12CDW meets industry standards.

7.What is the process for return or replacement of TL7770-12CDW?

All TL7770-12CDW units undergo pre-shipment inspection (PSI). If there is an issue with TL7770-12CDW, 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 TL7770-12CDW part is unused and in its original packaging.

Return procedure for TL7770-12CDW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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