NE555P Single Precision Timer (Pack of 10), Timing From Microseconds to Hours By Texas InstrumentsCategory: Texas Holdem Blind TimerMain products of our company :electric, home,toy,clother ,etc. Since its foundation ,the company keeps living up to the belief of :"honest selling ,best quality ,people-orientation and benefits to customers. "We are doing everything to offer our customers with best services and best products .We promise that we'll be responsible all the way to the end once our services begin These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the time-delay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the astable 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. If you are interested in any of our products or would like to discuss a custom order, please feel free to contact us.