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

Texas Instruments TL7705BCD

Name: TL7705BCD
Brand: Texas Instruments
SKU: TL7705BCD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TL7705BCD

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TL7705BCD.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

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Product details

Overview

TL7705BCD from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for 5-V microprocessor systems. It monitors the SENSE input for undervoltage conditions, provides true and complement active-high/active-low RESET outputs, features an externally adjustable reset pulse duration via CT pin, and delivers a stable 2.53 V reference voltage at REF. It operates across 3.6 V to 18 V supply range and supports 0°C to 70°C ambient operation.

For engineers reviewing the TL7705BCD datasheet, TL7705BCD pinout, TL7705BCD application, or TL7705BCD equivalent, key selection considerations include its 4.55 V negative-going threshold voltage (V_IT–), ±30 mA output drive capability, open-collector/open-drain output architecture requiring external pullup/pulldown resistors, and SOIC-8 package compatibility with standard PCB layout practices for embedded reset control.

Technical Context

The TL7705BCD implements a precision bandgap-based voltage reference and comparator architecture to detect supply drops below 4.55 V (typical) at the SENSE input. Its internal timing capacitor charging circuit (CT pin) generates a user-defined reset pulse duration governed by t_d ≈ 2.6 × 10⁴ × C_T, enabling configurable hold time after fault recovery.

It supports dual reset signaling: RESET (active-high, open-collector) and RESET (active-low, open-collector), both defined down to V_CC ≥ 1 V. The RESIN pin allows external override of reset state, forcing RESET high and RESET low when pulled low - a feature critical for manual system reset or watchdog coordination.

Key Specifications

Parameter	Value and Actual Design Meaning
V_IT– Threshold	4.55 V (typical); precise undervoltage detection point for 5-V rail supervision
Reference Voltage	2.53 V (typical at 25°C); stable internal reference for external circuitry or calibration
Supply Range	3.6 V to 18 V; supports wide-input industrial and legacy 5-V/12-V systems
Output Drive	±30 mA (max); sufficient to directly drive logic inputs or small capacitive loads without buffering
Operating Temp	0°C to 70°C; commercial-grade temperature range suitable for notebooks, STBs, and factory automation
Package	SOIC-8 (D); 4.90 mm × 3.91 mm body, RoHS-compliant, MSL Level-2
Reset Pulse	Externally adjustable via CT capacitor; enables design-specific reset hold times (e.g., 2.6 ms with 0.1 µF)

Pinout & Package

TL7705BCD is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 4.90 mm × 3.91 mm body size, and exposed pad not present. Pin functions are validated per TI SLVS037O Rev O (Dec 2020).

Pin/Terminal	Circuit Role	Design Meaning
1 (REF)	Reference voltage output	Provides stable 2.53 V reference; requires 0.1 µF decoupling to GND to suppress noise-induced false triggering
2 (RESIN)	Reset input	Active-low override: pulls RESET high and RESET low when asserted; enables manual or watchdog-initiated reset
3 (CT)	Timing capacitor input	Controls reset pulse duration via external capacitor; charges with internal current source (t_d ≈ 2.6×10⁴×C_T)
4 (GND)	Ground reference	Primary return path for all internal circuits and output drivers; must be low-impedance connection
5 (RESET)	Active-low reset output	Open-collector output; requires external pullup resistor (e.g., 10 kΩ) to interface with microcontroller reset input
6 (RESET)	Active-high reset output	Open-collector output; requires external pulldown resistor (e.g., 10 kΩ) to ensure clean low-state assertion
7 (SENSE)	Supply voltage monitor input	Monitors regulated 5-V rail; triggers reset when voltage falls below 4.55 V (typical); high-impedance input (≤ –2 µA leakage)
8 (V_CC)	Power supply input	Accepts 3.6–18 V; powers internal circuitry and defines operating range; ICC = 3 mA max at full range

Key Features

Feature	Design Value
True/complement RESET outputs	Simultaneous active-high and active-low signals eliminate need for external inverters in mixed-logic systems
Externally adjustable reset pulse	CT pin enables precise, application-tailored reset hold time (e.g., 2.6 ms for 0.1 µF), ensuring reliable processor initialization
Precision voltage sensor	4.55 V threshold with ±50 mV tolerance over 0°C–70°C ensures accurate 5-V rail monitoring without external resistive dividers
Temperature-compensated reference	2.53 V REF output maintains ±50 mV stability across temperature, supporting accurate analog subsystem calibration
RESET defined down to V_CC ≥ 1 V	Enables valid reset assertion during brown-out or slow power ramp-up, preventing premature processor release

Applications

Industrial PLC Controller	Network Router Power Management
Use Scenario: Supervises 5-V auxiliary supply in programmable logic controller I/O modules during line transients and hot-swap events. IC Role / Device Role / Timing Role: Reset controller that asserts RESET on undervoltage, holds reset for 2.6 ms post-recovery, and provides REF for ADC reference scaling. Use Value: Prevents firmware corruption during 5-V rail dips caused by inductive load switching, using only one IC for both reset timing and reference generation.	Use Scenario: Monitors PoE-derived 5-V bias rail in enterprise router line cards subject to cable-length-induced voltage drop. IC Role / Device Role / Timing Role: SENSE-connected voltage supervisor with RESIN tied to FPGA status signal to coordinate controlled reboot on thermal shutdown. Use Value: Eliminates need for discrete comparator + timer + reference IC, reducing BOM count while guaranteeing 4.55 V trip point accuracy across temperature.
Medical Diagnostic Display	Automotive Infotainment Head Unit
Use Scenario: Ensures clean boot sequence for ARM-based display controller after 5-V DC/DC converter startup in ultrasound equipment. IC Role / Device Role / Timing Role: Generates power-on reset pulse synchronized to 5-V rail stabilization, with REF used to calibrate touch-screen ADC reference. Use Value: Guarantees >100 ms reset hold time (via 0.1 µF CT) before processor release, avoiding display initialization failures during marginal input conditions.	Use Scenario: Supervises 5-V USB hub supply in infotainment head unit exposed to automotive battery transients (load dump, cold crank). IC Role / Device Role / Timing Role: Dual-output reset generator with RESIN linked to CAN bus error flag to force safe mode entry on communication failure. Use Value: Provides deterministic reset behavior under ISO 7637-2 pulse 5a/b stress, leveraging open-collector outputs for robust level-shifting into 3.3-V MCU domain.

Industrial PLC Controller

Network Router Power Management

Use Scenario: Supervises 5-V auxiliary supply in programmable logic controller I/O modules during line transients and hot-swap events.

IC Role / Device Role / Timing Role: Reset controller that asserts RESET on undervoltage, holds reset for 2.6 ms post-recovery, and provides REF for ADC reference scaling.

Use Value: Prevents firmware corruption during 5-V rail dips caused by inductive load switching, using only one IC for both reset timing and reference generation.

Use Scenario: Monitors PoE-derived 5-V bias rail in enterprise router line cards subject to cable-length-induced voltage drop.

IC Role / Device Role / Timing Role: SENSE-connected voltage supervisor with RESIN tied to FPGA status signal to coordinate controlled reboot on thermal shutdown.

Use Value: Eliminates need for discrete comparator + timer + reference IC, reducing BOM count while guaranteeing 4.55 V trip point accuracy across temperature.

Medical Diagnostic Display

Automotive Infotainment Head Unit

Use Scenario: Ensures clean boot sequence for ARM-based display controller after 5-V DC/DC converter startup in ultrasound equipment.

IC Role / Device Role / Timing Role: Generates power-on reset pulse synchronized to 5-V rail stabilization, with REF used to calibrate touch-screen ADC reference.

Use Value: Guarantees >100 ms reset hold time (via 0.1 µF CT) before processor release, avoiding display initialization failures during marginal input conditions.

Use Scenario: Supervises 5-V USB hub supply in infotainment head unit exposed to automotive battery transients (load dump, cold crank).

IC Role / Device Role / Timing Role: Dual-output reset generator with RESIN linked to CAN bus error flag to force safe mode entry on communication failure.

Use Value: Provides deterministic reset behavior under ISO 7637-2 pulse 5a/b stress, leveraging open-collector outputs for robust level-shifting into 3.3-V MCU domain.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS3808G33DBVR	Fixed 3.3-V threshold; no REF output; push-pull outputs; 1.8–6.0 V supply range	Designed for 3.3-V systems only; lacks reference voltage source and adjustable timing	Select when supervising 3.3-V rails and no external reference is needed; not suitable for 5-V TL7705BCD replacement
MAX809SEUR+T	Fixed 3.08-V threshold; single active-low reset; no REF or CT pin; 1.0–6.0 V supply	Basic reset-only function; no complement output, no timing adjustment, no reference	Choose for cost-sensitive 3.3-V applications requiring minimal functionality; cannot replace TL7705BCD's dual-output or 5-V supervision

Compared with TPS3808G33DBVR and MAX809SEUR+T, TL7705BCD uniquely combines 4.55-V threshold accuracy, true/complement outputs, adjustable reset timing, and integrated 2.53-V reference - making it irreplaceable in 5-V microprocessor systems requiring coordinated reset and analog reference sharing.

Availability

TL7705BCD is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical diagnostic displays, and automotive infotainment head units requiring stable component supply with guaranteed long-term sourcing.

Supply support for TL7705BCD 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.

TL7705BCD belongs to TI's legacy supply-voltage supervisor product line, engineered specifically for reliable reset control in 5-V microprocessor and microcontroller systems where precision threshold detection, dual-output signaling, and integrated reference voltage are required.

FAQ

What is the exact undervoltage detection threshold voltage for TL7705BCD?

The TL7705BCD has a nominal negative-going input threshold voltage (V_IT–) of 4.55 V at 25°C, with a guaranteed range of 4.45 V to 4.65 V across its full 0°C to 70°C operating temperature range. This threshold is factory-trimmed and temperature-compensated, enabling precise supervision of standard 5-V power rails without external resistor dividers. The value is specified in Section 6.5 of the TL7705BCD datasheet (SLVS037O).

Does TL7705BCD require external pullup/pulldown resistors on its RESET outputs?

Yes, TL7705BCD requires external resistors: a pullup resistor (typically 10 kΩ) on the active-high RESET pin and a pulldown resistor (also typically 10 kΩ) on the active-low RESET pin. Both outputs are open-collector, meaning they can only sink current. Without proper termination, undefined logic states may occur during switching, potentially delaying system reset or causing metastability. TI explicitly recommends matching resistor values even when only one output is used.

Can TL7705BCD be used to supervise a 3.3-V supply rail?

No, TL7705BCD is not suitable for direct 3.3-V rail supervision because its fixed 4.55-V threshold exceeds typical 3.3-V system tolerances. Applying 3.3 V to the SENSE pin will never trigger reset assertion. For 3.3-V applications, TI recommends alternatives like TL7703B (3.3-V variant) or TPS3808G33. Using TL7705BCD with a resistive divider to scale 3.3 V up to 4.55 V introduces accuracy loss, temperature drift, and reliability risk - contrary to the device's precision design intent.

What is the purpose of the CT pin on TL7705BCD, and how is it configured?

The CT pin on TL7705BCD sets the reset pulse duration via an external capacitor. An internal current source charges the capacitor until it reaches an internal reference (~1.8 V), generating a time delay t_d ≈ 2.6 × 10⁴ × C_T (with C_T in farads). For a standard 2.6 ms pulse, a 0.1 µF capacitor is used. TI also recommends adding a series resistor (≥560 Ω) between CT and V_CC to prevent false triggering during rapid V_CC slew-down events, as documented in Section 10 of the datasheet.

Is TL7705BCD pin-compatible with other members of the TL77xxB family, such as TL7702BCD or TL7733BCD?

Yes, TL7705BCD is pin-compatible with TL7702BCD and TL7733BCD within the same SOIC-8 (D) package. All share identical pinout, electrical characteristics (except threshold voltage), and functional block diagram. The only difference is the factory-trimmed V_IT–: 2.53 V for TL7702B, 4.55 V for TL7705B, and 3.08 V for TL7733B. This allows direct substitution in designs where threshold voltage matches the target supply rail, provided operating temperature range and marking suffixes (C/I/Q) align.

TL7705BCD Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.55V

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:: 8-SOIC

TL7705BCD FAQ

1.How can I place an order for TL7705BCD through Aetrix?

Please submit a Request for Quotation (RFQ) for TL7705BCD 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 TL7705BCD reliable?

The price and inventory of TL7705BCD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7705BCD is usually 5 days.

3.What payment methods are accepted for TL7705BCD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7705BCD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TL7705BCD?

TL7705BCD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TL7705BCD 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 TL7705BCD?

For technical support, including TL7705BCD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7705BCD requirements.

6.How does Aetrix verify that TL7705BCD is sourced from the original manufacturer or authorized distributors?

All TL7705BCD 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 TL7705BCD meets industry standards.

7.What is the process for return or replacement of TL7705BCD?

All TL7705BCD units undergo pre-shipment inspection (PSI). If there is an issue with TL7705BCD, 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 TL7705BCD part is unused and in its original packaging.

Return procedure for TL7705BCD:

1.Submit a request within 90 days.

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

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