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These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the time-delay or mono-stable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the a-stable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor. The threshold and trigger levels normally are two-thirds and one-third, respectively, of VCC. These levels can be altered by use of the control-voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set, and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the output is low. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset, and the output goes low. When the output is low, a low-impedance path is provided between discharge (DISCH) and ground. The output circuit is capable of sinking or sourcing current up to 200 mA. Operation is specified for supplies of 5 V to 15 V. With a 5-V supply, output levels are compatible with TTL inputs.
The SA555P is a precision timer integrated circuit (IC) manufactured by Texas Instruments. It is a dual-in-line package (DIP-8) that contains two independent 555 timer circuits. Description: The SA555P is a dual precision timer IC that contains two independent 555 timer circuits. It is designed to provide accurate timing and control functions in a wide variety of applications. The SA555P is a low-power device that operates from a single supply voltage of 4.5V to 16V. Features: Low power consumption High accuracy Wide operating voltage range (4.5V to 16V) Low output impedance High frequency stability Low input current High output current capability Low temperature coefficient Low propagation delay Applications: The SA555P is suitable for a wide range of applications including timing, pulse generation, oscillator, and control circuits. It can be used in automotive, industrial, and consumer electronics applications. It is also suitable for use in medical, security, and communication systems. (For reference only)