Precision Timer - SE555

SE555 (ACTIVE)

Precision Timer

 

Description

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.

Features

  • Timing From Microseconds to Hours
  • Astable or Monostable Operation
  • Adjustable Duty Cycle
  • TTL-Compatible Output Can Sink or Source
    Up to 200 mA
  • On Products Compliant to MIL-PRF-38535,
    All Parameters Are Tested Unless Otherwise Noted. On All Other Products, Production Processing Does Not Necessarily Include
    Testing of All Parameters.

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Parametrics Compare all products in Timers

 
Frequency (Max) (MHz)
VCC (Min) (V)
VCC (Max) (V)
Iq (Typ) (uA)
Rating
Pin/Package
Operating Temperature Range (C)
SE555 NA555 NE555 SA555
0.1    0.1    0.1    0.1   
4.5    4.5    4.5    4.5   
18    16    16    16   
4000    3000    2000    2000   
Catalog    Catalog    Catalog    Catalog   
8PDIP
8SOIC   
8PDIP
8SOIC   
8PDIP
8SO
8SOIC
8TSSOP   
8PDIP
8SOIC   
-55 to 125    -40 to 105    0 to 70    -40 to 85   

Other qualified versions of SE555

Version Part Number Definition
Military SE555M QML certified for Military and Defense Applications
Space SE555-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application

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