Overview
The SA555D is a precision timing circuit produced by Texas Instruments. This component is part of the 555 timer family and is designed for operation over a wide temperature range of -40°C to 85°C. Although the SA555D is currently obsolete and no longer in production, it remains a significant component in the history of electronic design due to its versatility and reliability. The device is capable of producing accurate time delays or oscillations, making it suitable for a variety of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | 8-SOIC (D) | |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage | 4.5 to 16 | V |
| Output Current | ±200 mA | |
| Threshold Voltage Level | 2.7 to 4 | V (at VCC = 5 V) |
| Trigger Voltage Level | 1.45 to 1.9 | V (at VCC = 5 V) |
| Reset Voltage Level | 1.1 to 0.4 | V |
| High-Level Output Voltage | 3.3 to 12.5 | V (at IOH = -200 mA) |
| Low-Level Output Voltage | 0.1 to 0.4 | V (at IOL = 8 mA) |
Key Features
- Timing from microseconds to hours
- Astable or monostable operation
- Adjustable duty cycle
- TTL-compatible output can sink or source up to 200 mA
- Operation specified for supplies of 5 V to 15 V
- Output levels compatible with TTL inputs at 5-V supply
- Precision timing controlled by external resistor and capacitor networks
- Reset input can override all other inputs to initiate a new timing cycle
Applications
The SA555D is versatile and can be used in a variety of applications, including:
- Pulse generation and timing circuits
- Oscillators and multivibrators
- Alarm and timer circuits
- Sequential timing and delay circuits
- Power supply monitoring and control
Q & A
- What is the operating temperature range of the SA555D?
The SA555D operates over a temperature range of -40°C to 85°C. - What is the typical supply voltage range for the SA555D?
The supply voltage range is from 4.5 V to 16 V. - Can the SA555D operate in both astable and monostable modes?
Yes, the SA555D can operate in both astable and monostable modes. - What is the maximum output current of the SA555D?
The SA555D can sink or source up to 200 mA. - Is the SA555D still in production?
No, the SA555D is obsolete and no longer in production. - What are the typical threshold and trigger voltage levels for the SA555D?
The threshold voltage level is typically between 2.7 V and 4 V, and the trigger voltage level is typically between 1.45 V and 1.9 V at a 5-V supply. - How is the timing interval controlled in the SA555D?
The timing interval is controlled by a single external resistor and capacitor network in monostable mode, and by two external resistors and a single external capacitor in astable mode. - Can the output of the SA555D be used with TTL inputs?
Yes, the output levels of the SA555D are compatible with TTL inputs when using a 5-V supply. - What is the purpose of the reset input on the SA555D?
The reset input can override all other inputs to initiate a new timing cycle and reset the output to low. - What are some common applications of the SA555D?
The SA555D is commonly used in pulse generation, oscillators, alarm and timer circuits, sequential timing, and power supply monitoring.
