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KA556

Dual Timer
Features
Replaces two KA555 Timers Operates in Both Astable and Monos Table Modes High Output Current TTL Compatible Timing From Microsecond to Hours Adjustable Duty Cycle Temperature Stability of 0.005% Per C

Description
The KA556 series dual monolithic timing circuits are a highly stable controller capable of producing accurate time delays or oscillation. The KA556 is a dual KA555. Timing is provided an external resistor and capacitor for each timing function. The two timers operate independently of each other, sharing only VCC and ground. The circuits may be triggered and reset on falling waveforms. The output structures may sink or source 200mA.
14-DIP

Applications
Precision Timing Pulse Shaping Pulse Width Modulation Frequency Division Traffic Light Control Sequential Timing Pulse Generator Time Delay Generator Touch Tone Encoder Tone Burst Generator

1

14-SOP

1

Internal Block Diagram
Trigger Threshold

Control Voltage

3

14

VCC

6

12

11
R

Control Voltage

5

Trigger

R

2

Comparator

R R

Comparator

Comparator

R R

Comparator

THRESHOLD

1

Discharge

Flip Flop

Flip Flop

Output

Output

Output

5

Reset

4

GND

7

13

Discharge

9

Output

10

Reset

Rev. 1.0.1
2004 Fairchild Semiconductor Corporation

KA556 Datasheet Fairchild Download PDF

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KA556 DATASHEET