NE556N

Texas Instruments

Μη Διαθέσιμο

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

 

Description
These devices provide two independent timing circuits of the NA555, NE555, SA555, or SE555 type in each
package. These circuits 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 normally are 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 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 the
discharge (DISCH) terminal and ground (GND).

 

APPLICATIONS

 · 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