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STMicroelectronics TL7705ACD1/A
- Part No.:
- TL7705ACD1/A
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7705ACD1/A.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,206
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Product details
Overview
TL7705ACD1/A from STMicroelectronics is a precision supply voltage supervisor IC designed for microprocessor reset control, featuring a 4.5 V ±2.5% threshold voltage, true/complement reset outputs (RESET and RESET), 3.6–18 V operating supply range, externally adjustable reset pulse width via CT pin (0.65–2.6 ms with 0.1 µF), and temperature-compensated 2.53 V reference output. It ensures reliable power-on and brownout reset in embedded controllers.
For engineers reviewing the TL7705ACD1/A datasheet, TL7705ACD1/A pinout, TL7705ACD1/A application, or TL7705ACD1/A equivalent, key selection considerations include its adjustable reset timeout, dual active-high/active-low outputs, SENSE input hysteresis (15 mV), 1.8–3.3 mA supply current, and SO-8 package compatibility with industrial temperature range (0°C to 70°C).
Technical Context
The TL7705ACD1/A implements a precision bandgap-based voltage sensing architecture with internal hysteresis (15 mV) to prevent chatter during supply transients. Its SENSE input monitors system VCC, triggering reset when voltage falls below 4.5 V (typ.) or rises above it after power-up.
Reset timing is controlled by an external capacitor on the CT pin, generating a programmable delay (tpo = 1.3×10⁴ × CT seconds); the REF pin provides a stable 2.53 V reference requiring a 0.1 µF bypass capacitor to suppress fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.5 V (typ.), ±2.5% tolerance - ensures reset assertion at precise VCC level for 5 V systems |
| Supply Voltage Range | 3.6 V to 18 V - supports wide-input industrial and automotive subsystems without external regulation |
| Reset Pulse Width | 0.65–2.6 ms (with 0.1 µF CT) - meets minimum reset hold time requirements of most 8/16-bit microcontrollers |
| Reference Output | 2.53 V ±0.05 V - stable, temperature-compensated voltage source for external comparator biasing or calibration |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded applications including point-of-sale and industrial HMI |
| Output Drive | ±16 mA (RESET/RESET) - directly drives TTL/CMOS inputs and small capacitive loads without buffer |
| Hysteresis | 15 mV - prevents false resets during slow-rising or noisy supply rails |
Pinout & Package
TL7705ACD1/A is housed in an SO-8 (Small Outline, 8-pin) surface-mount package with standard 1.27 mm pitch, JEDEC MS-012AC compliant, and rated for 120°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Voltage Output | Provides 2.53 V bandgap reference; requires 0.1 µF decoupling to ground for noise immunity |
| 2 (GND) | Ground Reference | System return path for all internal circuitry and reference; must be low-impedance |
| 3 (CT) | Timing Capacitor Input | Connects external capacitor to set reset pulse width; tpo = 1.3×10⁴ × CT (seconds) |
| 4 (RESET) | Active-High Reset Output | Open-drain compatible; pulled high externally to assert reset to microcontroller /RST pin |
| 5 (SENSE) | Supply Monitoring Input | Monitors VCC; asserts reset if voltage drops below 4.5 V threshold |
| 6 (VCC) | Power Supply Input | Accepts 3.6–18 V; powers internal reference, comparator, and output drivers |
| 7 (RESET) | Active-Low Reset Output | Complementary to pin 4; drives low during reset condition for direct µP /RESET interface |
| 8 (RESIN) | External Reset Input | Active-low manual reset trigger; forces reset regardless of SENSE voltage |
Key Features
| Feature | Design Value |
|---|---|
| Externally Adjustable Reset Timeout | Capacitor-programmable delay (0.65–2.6 ms typical) eliminates fixed-timing constraints in diverse MCU platforms |
| Dual Complementary Reset Outputs | Simultaneous active-high (pin 4) and active-low (pin 7) signals simplify interface to mixed-logic families |
| Precision Threshold with Hysteresis | 4.5 V ±2.5% trip point + 15 mV hysteresis prevents oscillation during marginal supply conditions |
| Stable On-Chip Reference | 2.53 V ±0.05 V reference (pin 1) enables accurate external monitoring or calibration without extra components |
| Wide Supply Range Operation | 3.6–18 V operation supports unregulated battery or industrial bus inputs without pre-regulation |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and brownout detection in programmable logic controller CPU boards with 5 V rail. IC Role / Device Role / Timing Role: Monitors 5 V supply and asserts synchronized reset to ARM Cortex-M3 core and peripheral ASICs during startup and voltage dips. Use Value: Guarantees ≥1.3 ms reset pulse width (via 0.1 µF CT) meeting STM32F103 minimum reset hold time specification. | Use Scenario: Reset supervision for microcontroller in door module controlling window lift, mirror fold, and lock actuation. IC Role / Device Role / Timing Role: Detects battery voltage sag below 4.5 V during cranking and initiates clean restart of Infineon AURIX TC234L. Use Value: 15 mV hysteresis prevents spurious resets during engine start transients; REF pin used to bias external watchdog timer. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Ensuring deterministic boot sequence in ARM-based POS terminals powered from 12 V DC adapters. IC Role / Device Role / Timing Role: Generates power-on reset and monitors 5 V LDO output; RESIN pin tied to mechanical reset button. Use Value: Dual RESET/RESET outputs interface natively to both processor /RST and FPGA configuration reset pins. | Use Scenario: Supervising microcontroller supply in DIN-rail mounted electricity meters exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Provides reset under brownout conditions while operating across 0°C–70°C ambient range. Use Value: 3.6–18 V supply range accommodates input variations from switching power supply; SO-8 package supports automated reflow assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V threshold; internal 200 ms timeout; no REF output | Lacks adjustable timing and reference output; suited only for fixed-voltage, non-calibration designs | Select when 3.3 V rail supervision suffices and external timing cap is undesirable |
| MAX691CPA+ | 5 V threshold; 140 ms min timeout; includes watchdog timer | Integrates watchdog function but lacks REF output and has coarser threshold accuracy (±2.5% vs ±2.5% typ., ±3.5% max) | Choose when system-level watchdog capability is required alongside reset supervision |
Compared with TPS3808G33DBVR and MAX691CPA+, TL7705ACD1/A uniquely offers field-adjustable reset duration, a precision reference output, and complementary reset signals-making it optimal for flexible, multi-rail, or calibration-sensitive embedded designs where timing and signal polarity must be tailored.
Availability
TL7705ACD1/A is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, smart metering, and point-of-sale terminal designs requiring stable component supply and long-term manufacturability.
Supply support for TL7705ACD1/A 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and consumer markets with emphasis on reliability, energy efficiency, and integration.
The TL7700A series belongs to ST's analog power management portfolio, engineered specifically for robust, low-cost reset supervision in cost-sensitive microcontroller-based systems across commercial and industrial environments.
FAQ
What is the function of the REF pin on TL7705ACD1/A?
The REF pin (Pin 1) delivers a precision 2.53 V ±0.05 V temperature-compensated reference voltage. It requires a 0.1 µF ceramic capacitor to ground for stability and noise rejection. This output can bias external comparators, calibrate ADC references, or feed watchdog circuits-eliminating need for discrete voltage references in many designs.
How is the reset pulse width determined for TL7705ACD1/A?
The reset pulse width is set by an external capacitor connected to the CT pin (Pin 3). The relationship is tpo = 1.3 × 10⁴ × CT seconds, where CT is in farads. With a standard 0.1 µF capacitor, tpo = 1.3 ms (typ.), satisfying most microcontroller reset hold-time requirements without trimming.
Can TL7705ACD1/A monitor a 3.3 V supply rail?
No - TL7705ACD1/A has a fixed 4.5 V threshold optimized for 5 V systems. For 3.3 V rails, ST recommends TL7703ACD1/A (3.3 V threshold) or TL7700ACD1/A (2.5 V threshold). Using TL7705ACD1/A on 3.3 V would cause continuous reset assertion since the supply never reaches 4.5 V.
Does TL7705ACD1/A support manual reset override?
Yes - the RESIN pin (Pin 8) is an active-low manual reset input. Pulling RESIN low forces both RESET and RESET outputs into their active states regardless of SENSE voltage or supply level, enabling pushbutton-initiated system reset or integration with external fault detectors.
TL7705ACD1/A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 1µs Maximum Propagation Delay
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7705ACD1/A FAQ
1.How can I place an order for TL7705ACD1/A through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7705ACD1/A 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 TL7705ACD1/A reliable?
The price and inventory of TL7705ACD1/A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7705ACD1/A is usually 5 days.
3.What payment methods are accepted for TL7705ACD1/A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7705ACD1/A transactions.
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4.How is shipping managed for TL7705ACD1/A?
TL7705ACD1/A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7705ACD1/A 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 TL7705ACD1/A?
For technical support, including TL7705ACD1/A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7705ACD1/A requirements.
6.How does Aetrix verify that TL7705ACD1/A is sourced from the original manufacturer or authorized distributors?
All TL7705ACD1/A 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 TL7705ACD1/A meets industry standards.
7.What is the process for return or replacement of TL7705ACD1/A?
All TL7705ACD1/A units undergo pre-shipment inspection (PSI). If there is an issue with TL7705ACD1/A, 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 TL7705ACD1/A part is unused and in its original packaging.
Return procedure for TL7705ACD1/A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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