The CSS555 is pin-for-pin compatible with the customary 555 series timers as Figure 1 indicates.įIGURE 1. These qualities make it particularly well-suited for long lasting battery and small solar powered projects. It operates at a current under 5 ♚ and a supply voltage from 5.5V down to 1.2V. With a 5-V supply, output levels are compatible with TTL inputs.The CSS555 is a micropower programmable version of the 555 family of timer ICs. Operation is specified for supplies of 5 V to 15 V. The output circuit is capable of sinking or sourcing current up to 200 mA. When the output is low, a low-impedance path is provided between discharge (DISCH) and ground. When RESET goes low, the flip-flop is reset, and the output goes low. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. 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. When the trigger input falls below the trigger level, the flip-flop is set, and the output goes high. These levels can be altered by use of the control-voltage terminal. The threshold and trigger levels normally are two-thirds and one-third, respectively, of V CC. 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. In the time-delay or mono-stable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. These devices are precision timing circuits capable of producing accurate time delays or oscillation.
On All Other Products, Production Processing Does Not Necessarily Include On Products Compliant to MIL-PRF-38535,Īll Parameters Are Tested Unless Otherwise Noted.TTL-Compatible Output Can Sink or Source.
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