NE556

Packaging :
Maximum Power Dissipation : 600 mW
Maximum Operating Temperature : + 70 C
Minimum Operating Temperature : 0 C
Number of Internal Timers : 2
Type : Standard
Supply Voltage - Max : 16 V
Supply Voltage - Min : 4.5 V
Package / Case : PDIP-14


Features:

` Two Precision Timing Circuits per Package
` Astable or Monostable Operation
` TTL-Compatible Output Can Sink or Source Up to 150 mA
` Active Pullup or Pulldown
` Designed to be Interchangeable With Signetics NE556, SA556, and SE556
` Applications Include:
Precision Timers From Microseconds to
Hours
Pulse-Shaping CIrcuits
Missing-Pulse Detectors
Tone-Burst Generators
Pulse-Width Modulators
Pulse-Position Modulators
Sequential Timers
Pulse Generators
Frequency Dividers
Application Timers
Industrial Controls
Touch-Tone Encoders


Pinout




Specifications

Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Input voltage (CONT, RESET, THRES, and TRIG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  VCC
Output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±225 mA
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . .See Dissipation Rating Table
Package thermal impedance, qJA (see Note 2): D package . . . . . . . . . . . . . . . . . . . .86°C/W
                                                                           N package . . . . . . . . . . . . . . . . . . . 80°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package . . . . . . . .300°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or N package . . .  260°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65°C to 150°C


Description

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.