NE555 Single Precision Timer | TI.com

NE555 (ACTIVE) Single Precision Timer

Single Precision Timer - NE555
Datasheet
 

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.

Parametrics

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Part number Order Frequency (Max) (MHz) VCC (Min) (V) VCC (Max) (V) Iq (Typ) (uA) Rating Operating temperature range (C)
NE555 Order now 0.1     4.5     16     2000     Catalog     0 to 70    
NA555 Order now 0.1     4.5     16     3000     Catalog     -40 to 105    
SA555 Samples not available 0.1     4.5     16     2000     Catalog     -40 to 85    
SE555 Order now 0.1     4.5     18     4000     Catalog     -55 to 125