Timers & Support Products
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Features: • High output power : Pout = 30.0 dBm TYP. (VDS = 4.8 V, IDset = 200 mA, f = 1.9 G...
Type : | Standard | Package / Case : | PDIP-14 | ||
Number of Internal Timers : | 2 | Supply Voltage - Max : | 16 V | ||
Supply Voltage - Min : | 4.5 V | Maximum Power Dissipation : | 600 mW | ||
Maximum Operating Temperature : | + 70 C | Minimum Operating Temperature : | 0 C |
NE556 provides two independent timing circuits of the NE555, SA555, or SE555 type in each package. NE556 can be operated in the astable or the monostable mode with external resistor-capacitor (RC) timing control. The basic timing provided by the RC time constant can be controlled actively by modulating the bias of the control-voltage input.
The threshold (THRES) and trigger (TRIG) levels of NE556 are normally two-thirds and one-third, respectively, of VCC. These levels can be altered by using the control-voltage (CONT) terminal. When the trigger input falls below trigger level, the flip-flop is set and the output goes high. If the trigger input of NE556 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 the reset input goes low, the flip-flop is reset and the output goes low. When the output is low, a low-impedance path is provided between the discharge (DISCH) terminal and ground (GND).
The NE556 is characterized for operation from 0°C to 70°C. The SA556 is characterized for operation from 40°C to 85°C, and the SE556 is characterized for operation over the full military range of 55°C to 125°C.