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National Semiconductor Electronic Components Datasheet

LM556 Datasheet

Dual Timer

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March 2000
LM556
Dual Timer
General Description
The LM556 Dual timing circuit is a highly stable controller ca-
pable of producing accurate time delays or oscillation. The
556 is a dual 555. Timing is provided by an external resistor
and capacitor for each timing function. The two timers oper-
ate 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.
Features
n Direct replacement for SE556/NE556
n Timing from microseconds through hours
n Operates in both astable and monostable modes
n Replaces two 555 timers
n Adjustable duty cycle
n Output can source or sink 200mA
n Output and supply TTL compatible
n Temperature stability better than 0.005% per ˚C
n Normally on and normally off output
Applications
n Precision timing
n Pulse generation
n Sequential timing
n Time delay generation
n Pulse width modulation
n Pulse position modulation
n Linear ramp generator
Connection Diagram
Dual-In-Line, Small Outline Packages
Ordering Information
Package
14-Pin SOIC
14-Pin MDIP
Part Number
LM556CM
LM556CMX
LM556CN
Top View
DS007852-1
Package Marking
LM556CM
LM556CM
LM556CN
Media Transport
Rails
2.5k Units Tape and Reel
Rails
NSC Drawing
M14A
N14a
© 2000 National Semiconductor Corporation DS007852
www.national.com


National Semiconductor Electronic Components Datasheet

LM556 Datasheet

Dual Timer

No Preview Available !

Schematic Diagram
www.national.com
2


Part Number LM556
Description Dual Timer
Maker National Semiconductor
Total Page 8 Pages
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