Product Overview
Texas Instruments 5V Reset Controller Evaluation Board and Components
Condition
New old stock in unused vintage condition. Markings legible: IC marked TL7705ACP with 514X date code, PCB silkscreened RESET GENERATOR NC1 TL7705A. Includes printed 1985 folder card, unpopulated circuit board, 8-pin DIP integrated circuit, 10 kΩ resistor, and two through-hole capacitors.
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Product Overview
Texas Instruments TL7705A Supply Voltage Supervisor Linear Circuits Application Sample provides a dedicated 5 V logic supply monitor and reset generator circuit. Designed in 1985, this vintage evaluation folder includes reference documentation, schematic analysis, an unpopulated through-hole printed circuit board, and passive and active components anchored around the TL7705ACP supervisor IC. The integrated circuit monitors 5 V supplies, holding reset active during power-up or under-voltage conditions to protect digital systems from memory corruption and erratic logic states.
Key Features
- 4.55 V nominal sensing threshold designed for standard 5 V logic power rails
- TL7705ACP 8-pin plastic dual in-line package (PDIP) supervisor IC
- Complementary active-low RESET and active-high RESET outputs
- Unpopulated single-sided through-hole circuit board labeled RESET GENERATOR
- Included passive components: one 10 kΩ pull-up resistor and two capacitors
- Carded reference documentation includes full schematic, pinout, and timing formulas
Applications
- Retrocomputing builds and vintage microprocessor board restorations needing a dedicated 5 V power-on reset generator
- Bench prototyping of microcontroller brownout detection and clean logic reset timing circuits
- Instructional breadboard labs demonstrating voltage supervisor operation versus traditional passive RC networks
- Display or reference addition for collectors of vintage 1980s Texas Instruments engineering literature and semiconductor samples
Frequently Asked Questions
What components are included on the card?
The sample kit includes an unpopulated green PCB silkscreened RESET GENERATOR, one Texas Instruments TL7705ACP 8-pin DIP IC, one 10 kΩ resistor, and two through-hole capacitors.
What threshold voltage does the TL7705A monitor?
The TL7705A features an internal reference set to detect a nominal 4.55 V threshold, tailored specifically for monitoring 5 V digital logic supplies.
How is reset delay timing adjusted with this circuit?
Reset delay timing is determined by an external timing capacitor connected between pin 3 (CT) and ground, following the formula td = 1.3 × 10^4 × CT.
Before microcontrollers watched their own power rails, Texas Instruments put the reset cure on a card with two capacitors and a 10k resistor. Solder the parts onto the green board, wire it to your 5V rail, and let the 1980s keep your logic clean.
