Overview
The TL7705ACDRG4 is a supply-voltage supervisor integrated circuit from Texas Instruments, designed specifically for use as a reset controller in microcomputer systems. This device is part of the TL77xxA family and is tailored for applications requiring a 5-volt supply, such as TTL systems and microcomputer systems like the TMS7000. The TL7705A monitors the supply voltage and provides a reset signal when the voltage falls below a predetermined threshold, ensuring proper system operation during power-up and power-down sequences.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Threshold Voltage (Vt) | 4.55 | V |
| Output Pulse Duration | 0.65 - 2.6 | msec |
| Input Pulse Duration at RESIN | 0.4 | µs |
| Propagation Delay Time (tpd) | 1 | µs |
| Rise Time (tr) at RESET | 0.2 | µs |
| Fall Time (tf) at RESET | 3.5 | µs |
| Package Type | SOIC (8-pin), PDIP (8-pin), SO (8-pin) | |
| Package Size (SOIC) | 4.90 mm × 3.91 mm | |
| Package Size (PDIP) | 9.81 mm × 6.35 mm | |
| Package Size (SO) | 6.20 mm × 5.30 mm |
Key Features
- Programmable delay time using an external capacitor.
- Reset output becomes active when VCC falls below the threshold voltage (4.55 V).
- Supports three-supply monitoring.
- Low power consumption.
- External capacitor required at REF to reduce the influence of fast transients in the supply voltage.
- Available in SOIC, PDIP, and SO packages.
Applications
- TTL systems and microcomputer systems requiring a 5-volt supply (e.g., TMS7000).
- Microprocessor and memory circuits.
- Analog circuits operating with a 5-volt supply.
- General-purpose reset controllers in various electronic systems.
Q & A
- What is the primary function of the TL7705ACDRG4? The primary function is to monitor the supply voltage and provide a reset signal when the voltage falls below a predetermined threshold.
- What is the threshold voltage for the TL7705ACDRG4? The threshold voltage is 4.55 V.
- How is the delay time programmed in the TL7705ACDRG4? The delay time is programmed using an external capacitor connected to the REF pin.
- What packages are available for the TL7705ACDRG4? It is available in SOIC (8-pin), PDIP (8-pin), and SO (8-pin) packages.
- What is the purpose of the external capacitor at the REF pin? The external capacitor reduces the influence of fast transients in the supply voltage.
- What are some typical applications of the TL7705ACDRG4? Typical applications include TTL systems, microcomputer systems, microprocessor and memory circuits, and analog circuits operating with a 5-volt supply.
- What happens to the reset outputs during power-down? During power-down, the reset outputs remain active until VCC falls below 2 V, after which the outputs are undefined.
- How long does the output pulse duration typically last? The output pulse duration typically lasts between 0.65 and 2.6 milliseconds.
- What is the propagation delay time from RESIN to RESET? The propagation delay time is typically 1 microsecond.
- What are the rise and fall times of the RESET output? The rise time is typically 0.2 microseconds, and the fall time is typically 3.5 microseconds.
