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Texas Instruments TL7705AIDR
- Part No.:
- TL7705AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7705AIDR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,269
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Product details
Overview
TL7705AIDR from Texas Instruments is a precision supply-voltage supervisor IC designed for reset control in 5-V microcomputer systems. It features a 4.55 V ±0.05 V threshold voltage (VIT−), 15 mV hysteresis, externally adjustable reset pulse duration via CT pin, temperature-compensated 2.53 V reference output, and operates across 3.5 V to 18 V supply range. Used in TTL-compatible systems like TMS7000-based controllers.
For engineers reviewing the TL7705AIDR datasheet, TL7705AIDR pinout, TL7705AIDR application, or TL7705AIDR equivalent, this page delivers verified electrical characteristics, SOIC-8 package details, dual active-high/active-low reset outputs, timing behavior under power-up/down transients, and validated alternatives for industrial and embedded reset circuit design.
Technical Context
The TL7705AIDR implements a precision undervoltage detection architecture with a trimmed bandgap reference and comparator sensing the SENSE input. Its internal delay timer-set by external capacitor CT-generates a guaranteed minimum 0.65 ms reset pulse (typ. 1.2 ms at 0.1 µF) after VCC exceeds 3.6 V and SENSE rises above 4.55 V.
During operation, it monitors SENSE continuously; if voltage drops below 4.55 V, both RESET (open-collector active-low) and RESET (active-high) assert immediately. The device remains functional down to VCC = 2 V, after which outputs become undefined-ensuring robust reset assertion during brownout and power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.55 V ±0.05 V - precise trip point for 5-V system supervision, enabling reliable reset initiation at nominal rail |
| Hysteresis | 15 mV - prevents chatter near threshold during slow-rising/falling supply transitions |
| Reference Output | 2.53 V ±0.05 V - stable, temperature-compensated voltage source usable for external biasing or calibration |
| Supply Range | 3.5 V to 18 V - supports wide-input designs including 5-V, 9-V, and 12-V systems without external regulation |
| Reset Pulse Duration | 0.65–2.6 ms (CT = 0.1 µF) - programmable via external capacitor, meeting microprocessor minimum reset hold-time requirements |
| Output Drive | ±16 mA - sufficient sink/source capability for direct interface to TTL/CMOS inputs without pull-up buffers |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded applications with thermal stability |
Pinout & Package
TL7705AIDR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, RoHS-compliant, with NIPDAU lead finish and MSL Level-1 rating for unlimited reflow exposure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Voltage reference output | Provides stable 2.53 V reference; requires 0.1 µF decoupling to GND for noise immunity and transient rejection |
| RESIN (Pin 2) | Manual reset input | Active-low asynchronous reset trigger; accepts logic-level signals (VIL ≤ 0.6 V, VIH ≥ 2 V) |
| CT (Pin 3) | Timing capacitor connection | Sets reset pulse width: td ≈ 13 ms × CT(µF); 0.1 µF yields ~1.3 ms typical delay |
| GND (Pin 4) | Ground reference | Common return for all internal circuits; must be low-impedance and isolated from noisy digital ground paths |
| RESET (Pin 5) | Active-high reset output | Open-collector output; pulled high externally to VCC or logic rail; asserts high during reset condition |
| RESET (Pin 6) | Active-low reset output | Open-collector output; pulled high externally; asserts low during reset condition-directly compatible with most µP reset inputs |
| SENSE (Pin 7) | Supply monitoring input | Monitors regulated or unregulated rail; threshold fixed at 4.55 V; supports input up to 10 V (per spec) |
| VCC (Pin 8) | Power supply input | Operates from 3.5 V to 18 V; powers internal circuitry and enables reset generation only when ≥3.6 V |
Key Features
| Feature | Design Value |
|---|---|
| Power-on reset generator | Guarantees reset assertion until VCC reaches 3.6 V and SENSE exceeds 4.55 V, then delays deassertion for ≥0.65 ms |
| Automatic undervoltage reset | Instantaneous dual-output assertion (RESET low, RESET high) when SENSE falls below 4.55 V during runtime |
| Externally adjustable pulse duration | Reset hold time set precisely via single capacitor (CT), eliminating need for internal timing resistors or trimming |
| Precision voltage sensor | 4.55 V threshold with ±0.05 V tolerance over –40°C to +85°C ensures consistent reset behavior across temperature |
| Temperature-compensated reference | 2.53 V REF output varies ≤16 mV from –40°C to +85°C-enables accurate external analog functions without additional regulators |
Applications
| Microprocessor System Reset | TTL-Based Controller Supervision |
|---|---|
|
Use Scenario: Power sequencing and initialization of a 5-V TMS7000 microcontroller in an industrial PLC module. IC Role / Device Role / Timing Role: Monitors VCC and asserts RESET until stable 5-V rail is confirmed, then holds reset for 1.3 ms before releasing processor. Use Value: Prevents erratic boot-up caused by marginal supply rise time; eliminates need for discrete RC reset networks. |
Use Scenario: Ensuring deterministic startup of legacy TTL logic banks powered from a shared 5-V rail. IC Role / Device Role / Timing Role: Acts as centralized reset arbiter-sensing rail integrity and driving synchronous reset to multiple TTL register banks. Use Value: Eliminates race conditions between clock enable and data latch initialization; guarantees all logic starts from known state. |
| Multi-Rail Power Supply Monitoring | Embedded Communication Module Reset |
|
Use Scenario: Coordinating reset timing across independent 5-V, 12-V, and 3.3-V rails in a multi-power-domain system. IC Role / Device Role / Timing Role: SENSE input tied to 5-V rail; RESET output cascaded to enable 12-V/3.3-V LDOs only after 5-V stabilization. Use Value: Enforces strict power-up sequence without custom logic; avoids backfeed or latch-up in mixed-voltage subsystems. |
Use Scenario: Reliable restart of an RS-485 communication module after brownout events in remote sensor nodes. IC Role / Device Role / Timing Role: Detects 5-V rail collapse and asserts RESET to MCU and transceiver simultaneously for clean recovery. Use Value: Restores UART/PHY synchronization without firmware intervention; reduces field failure due to partial resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply-voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V threshold; internal timer (200 ms typ); no REF output; higher quiescent current (8 µA vs 3 mA) | Designed for low-power battery-backed systems; lacks programmable timing and reference output needed for 5-V TTL designs | Select only if 3.3 V supervision suffices and external timing capacitor is undesirable. |
| MAX809TRD3T | Fixed 3.08 V threshold; no REF output; 140 ms min reset pulse; SOIC-3 package (no CT/REF pins) | Targeted at space-constrained, single-rail applications; incompatible pinout and missing key features for TL7705AIDR replacement | Use only in new 3.3-V designs where compactness outweighs flexibility; not suitable for 5-V TTL systems. |
Compared with TPS3808G33DBVR and MAX809TRD3T, TL7705AIDR uniquely provides 4.55 V threshold accuracy, external timing control, and a buffered 2.53 V reference-making it irreplaceable in legacy 5-V microcontroller reset circuits requiring design continuity and analog integration.
Availability
TL7705AIDR is available at Aetrix Electronics and suitable for industrial PLCs, embedded communication modules, microprocessor-based instrumentation, and legacy TTL system supervision requiring stable component supply and long-term lifecycle support.
Supply support for TL7705AIDR 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 experience in high-reliability industrial and automotive ICs.
The TL77xxA family was engineered specifically as precision reset supervisors for microcomputer systems-emphasizing threshold accuracy, noise-immune timing, and robust operation across wide voltage and temperature ranges.
FAQ
What is the exact reset threshold voltage of TL7705AIDR, and how tightly is it specified?
The TL7705AIDR has a guaranteed negative-going input threshold voltage (VIT−) of 4.55 V ±0.05 V at 25°C, with hysteresis of 15 mV. This specification is maintained across the full operating temperature range (–40°C to +85°C), ensuring consistent 5-V rail supervision without recalibration or margining.
Does TL7705AIDR require an external capacitor, and what is its function?
Yes, TL7705AIDR requires an external capacitor on the CT pin (Pin 3) to set the reset pulse duration. With CT = 0.1 µF, the typical delay is 1.2 ms-meeting common microprocessor reset-hold requirements. The relationship is td ≈ 13 ms × CT(µF), allowing precise adjustment from sub-millisecond to multi-millisecond durations.
Can TL7705AIDR monitor a 12-V supply directly, or is level translation required?
TL7705AIDR can monitor supplies up to 10 V directly at the SENSE pin per its absolute maximum rating. For 12-V rails, a resistor divider is required to scale the voltage to ≤10 V while maintaining the 4.55 V threshold at the SENSE node-ensuring accurate detection without damaging the input.
What are the output types of TL7705AIDR's RESET and RESET pins?
Both RESET (Pin 6) and RESET (Pin 5) are open-collector outputs. RESET is active-low and commonly used to drive standard microprocessor reset inputs; RESET is active-high and useful for enabling logic or driving status indicators. Each supports ±16 mA sink/source current and requires external pull-up resistors.
Is the REF output on TL7705AIDR intended for external use, and what load can it drive?
Yes, the REF pin (Pin 1) delivers a precision 2.53 V temperature-compensated reference usable for external analog functions such as ADC biasing or comparator references. It is specified to drive ≤1 mA loads; a 0.1 µF bypass capacitor to GND is mandatory to maintain stability and noise immunity.
TL7705AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 1µs Maximum Propagation Delay
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7705AIDR FAQ
1.How can I place an order for TL7705AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7705AIDR 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 TL7705AIDR reliable?
The price and inventory of TL7705AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7705AIDR is usually 5 days.
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4.How is shipping managed for TL7705AIDR?
TL7705AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7705AIDR 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 TL7705AIDR?
For technical support, including TL7705AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7705AIDR requirements.
6.How does Aetrix verify that TL7705AIDR is sourced from the original manufacturer or authorized distributors?
All TL7705AIDR 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 TL7705AIDR meets industry standards.
7.What is the process for return or replacement of TL7705AIDR?
All TL7705AIDR units undergo pre-shipment inspection (PSI). If there is an issue with TL7705AIDR, 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 TL7705AIDR part is unused and in its original packaging.
Return procedure for TL7705AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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