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STMicroelectronics TL7705ACP/A
- Part No.:
- TL7705ACP/A
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TL7705ACP/A.pdf
- Description:
- IC SUPERVISOR 1 CHAN 8MINI DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,262
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Product details
Overview
TL7705ACP/A from STMicroelectronics is a precision supply voltage supervisor IC designed for power-on and brown-out reset generation in microprocessor and microcontroller systems. It features a 4.5 V ±50 mV threshold voltage, true/complement RESET outputs, externally adjustable reset pulse width (via CT pin), and operates across 3.6 V to 18 V supply range with temperature-compensated reference.
For engineers reviewing the TL7705ACP/A datasheet, TL7705ACP/A pinout, TL7705ACP/A application, or TL7705ACP/A equivalent, key selection considerations include its adjustable reset timeout, dual active-high/active-low outputs, 4.5 V sensing threshold, and SO-8 package compatibility with legacy 5 V and 3.3 V embedded control systems.
Technical Context
The TL7705ACP/A integrates a precision bandgap voltage reference and comparator with hysteresis (15 mV typical) to detect supply drops below 4.5 V. Its internal timing circuit generates a programmable reset pulse width via external capacitor on CT (pin 3), with tpo = 1.3 × 10⁴ × CT (CT in farads).
It provides simultaneous active-high RESET and active-low RESET outputs, enabling direct interface with both NMOS and PMOS reset inputs. The REF output (pin 1) supplies a stable 2.53 V reference and requires a 0.1 µF bypass capacitor to suppress fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.6 V to 18 V - supports wide-input industrial and automotive power rails without external regulation |
| Sense Threshold Voltage | 4.5 V ±50 mV - precise detection of 5 V system undervoltage conditions |
| Reference Voltage | 2.53 V (typ.) - stable, temperature-compensated reference for external monitoring or calibration |
| Reset Pulse Width | Adjustable via CT pin (0.65–2.6 ms @ 0.1 µF) - ensures sufficient reset hold time for diverse MCU clock domains |
| Hysteresis | 15 mV (typ.) - prevents chatter during slow-rising or noisy supply transitions |
| Operating Temperature | 0 °C to 70 °C - qualified for commercial-grade embedded control applications |
| Output Drive | ±16 mA - directly drives standard TTL/CMOS reset inputs without buffer stages |
Pinout & Package
TL7705ACP/A is housed in an 8-pin SOIC (SO-8) surface-mount package with standard 1.27 mm pitch, JEDEC MS-012AC compliant dimensions, and moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Output | 2.53 V buffered reference; requires 0.1 µF decoupling to GND for noise immunity |
| 2 (GND) | Ground Reference | System ground return for all internal circuits and output drivers |
| 3 (CT) | Timing Capacitor Input | Connects external capacitor to set reset pulse width (tpo = 1.3×10⁴ × CT) |
| 4 (RESET) | Active-High Reset Output | Open-collector high-level output; pulled up externally to define logic high |
| 5 (SENSE) | Supply Monitoring Input | Monitors VCC; triggers reset when voltage falls below 4.5 V threshold |
| 6 (VCC) | Positive Supply Input | Primary power input (3.6–18 V); powers internal reference and logic |
| 7 (RESET) | Active-Low Reset Output | Push-pull low-level output; sinks 16 mA to assert active-low reset |
| 8 (RESIN) | External Reset Input | Active-low manual reset trigger; forces outputs into reset state when pulled low |
Key Features
| Feature | Design Value |
|---|---|
| Externally Adjustable Reset Timeout | Enables precise tailoring of reset duration to match specific processor requirements using a single capacitor |
| Dual Complementary Reset Outputs | Provides both active-high and active-low signals for direct interfacing with mixed-logic families (TTL, CMOS, NMOS) |
| Temperature-Compensated Reference | 2.53 V reference stable over 0–70 °C enables reliable external monitoring without additional regulators |
| Wide Supply Range Operation | 3.6–18 V operation eliminates need for pre-regulation in battery-powered or unregulated DC systems |
| Programmable Hysteresis | 15 mV hysteresis prevents false resets during marginal supply recovery or ripple-induced dips |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power-up sequencing and brown-out protection for ARM Cortex-M based PLC CPU boards operating from 12 V vehicle battery with transient load dumps. IC Role / Device Role / Timing Role: Supervisor IC providing synchronized active-high and active-low reset assertion during startup and voltage sag events. Use Value: Ensures deterministic boot state by holding reset until 12 V rail stabilizes above 4.5 V and sustaining it for ≥1.3 ms via 0.1 µF CT capacitor. | Use Scenario: Reset management for microcontroller-based door lock actuator modules exposed to cold-cranking (6.5 V) and load-dump (28 V) conditions. IC Role / Device Role / Timing Role: Voltage monitor with hysteresis that asserts reset during undervoltage and releases only after sustained recovery above 4.5 V. Use Value: Prevents erratic MCU behavior during engine start by rejecting sub-4.45 V dips lasting <15 ms, per 15 mV hysteresis spec. |
| Point-of-Sale Terminal | Medical Infusion Pump Controller |
Use Scenario: Reliable power-on initialization for ARM-based POS terminals powered from universal AC adapters (5–12 V DC output). IC Role / Device Role / Timing Role: Dual-output reset generator ensuring both processor and peripheral ASICs initialize synchronously. Use Value: Eliminates need for discrete RC networks by integrating precision threshold and adjustable timing in one SO-8 device. | Use Scenario: Safety-critical reset supervision for PIC32-based infusion pump controller operating from isolated 5 V DC/DC converter. IC Role / Device Role / Timing Role: Fail-safe supervisor with 4.5 V threshold and complement outputs driving independent watchdog and main MCU reset lines. Use Value: Meets IEC 62304 Class B software safety requirements via deterministic reset timing and dual-path assertion. |
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 timer; no REF output; SOT-23-6 package | Lacks adjustable timeout and reference output; suited for space-constrained 3.3 V-only designs | Select when board area is critical and 3.3 V reset threshold suffices |
| MAX692CPA+ | 4.65 V threshold; fixed 200 ms timeout; includes watchdog timer; DIP-8 package | Includes watchdog functionality but lacks REF output and adjustable timeout; through-hole only | Select when watchdog supervision is required and through-hole assembly is acceptable |
Compared with TPS3808G33DBVR and MAX692CPA+, TL7705ACP/A uniquely combines adjustable reset timing, dual complementary outputs, and a buffered reference in an SO-8 package-making it optimal for legacy 5 V embedded systems requiring design flexibility and signal integrity.
Availability
TL7705ACP/A is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, point-of-sale terminals, and medical infusion pump controllers requiring stable component supply and long-term lifecycle support.
Supply support for TL7705ACP/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, specializing in microcontrollers, power management, analog, and automotive ICs.
TL7705ACP/A belongs to the TL7700A series of precision voltage supervisors, developed for robust reset control in microprocessor-based systems where supply stability and deterministic timing are critical.
FAQ
What is the function of the REF pin (pin 1) on TL7705ACP/A?
The REF pin outputs a precision 2.53 V temperature-compensated reference voltage derived from the internal bandgap. It must be decoupled with a 0.1 µF capacitor to ground to suppress supply noise and ensure stable reset threshold accuracy. This reference can also serve external circuits needing a calibrated voltage source.
How do I calculate the reset pulse width for a given CT capacitor value?
Use the formula tpo = 1.3 × 10⁴ × CT, where CT is in farads and tpo is in seconds. For example, a 0.1 µF capacitor yields tpo = 1.3 ms (typical). The actual width varies between 0.65 ms and 2.6 ms depending on process and temperature, as specified in the switching characteristics table.
Can TL7705ACP/A monitor a 3.3 V supply directly?
No - TL7705ACP/A has a fixed 4.5 V sense threshold and is not rated for direct 3.3 V supply monitoring. Attempting to apply 3.3 V to the SENSE pin will not trigger reset. For 3.3 V systems, use TL7703ACP/A (3.3 V threshold) or add a resistive divider to scale the supply to 4.5 V at SENSE.
What is the purpose of the RESIN pin (pin 8)?
The RESIN pin is an active-low manual reset input. Pulling it low forces both RESET outputs into their active states regardless of supply voltage, enabling external hardware reset initiation (e.g., front-panel button or system watchdog signal). It features ±100 µA input current and 0.6 V logic-low threshold.
TL7705ACP/A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-Mini DIP
TL7705ACP/A FAQ
1.How can I place an order for TL7705ACP/A through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7705ACP/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 TL7705ACP/A reliable?
The price and inventory of TL7705ACP/A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7705ACP/A is usually 5 days.
3.What payment methods are accepted for TL7705ACP/A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7705ACP/A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7705ACP/A?
TL7705ACP/A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7705ACP/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 TL7705ACP/A?
For technical support, including TL7705ACP/A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7705ACP/A requirements.
6.How does Aetrix verify that TL7705ACP/A is sourced from the original manufacturer or authorized distributors?
All TL7705ACP/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 TL7705ACP/A meets industry standards.
7.What is the process for return or replacement of TL7705ACP/A?
All TL7705ACP/A units undergo pre-shipment inspection (PSI). If there is an issue with TL7705ACP/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 TL7705ACP/A part is unused and in its original packaging.
Return procedure for TL7705ACP/A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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