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LM556 Datasheet

Dual Timer

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LM556 Dual Timer
LM556
SNAS549A – MARCH 2000 – REVISED OCTOBER 2015
1 Features
1 Direct Replacement for SE556/NE556
• Timing From Microseconds Through Hours
• Operates in Both Astable and Monostable Modes
• Replaces Two 555 Timers
• Adjustable Duty Cycle
• Output Can Source or Sink 200 mA
• Output and Supply TTL-Compatible
• Temperature Stability Better Than 0.005% per °C
• Normally On and Normally Off Output
2 Applications
• Precision Timing
• Pulse Generation
• Sequential Timing
• Time Delay Generation
• Pulse Width Modulation
• Pulse Position Modulation
• Linear Ramp Generator
3 Description
The LM556 dual-timing circuit is a highly-stable
controller capable of producing accurate time delays
or oscillation. The LM556 device is a dual-timing
version of the LM555 device. Timing is provided by
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 200 mA.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM556
SOIC (14)
PDIP (14)
3.91 mm × 8.65 mm
6.35 mm × 19.177 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Schematic Diagram
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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LM556 Datasheet Preview

LM556 Datasheet

Dual Timer

No Preview Available !

LM556
SNAS549A – MARCH 2000 – REVISED OCTOBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes.......................................... 8
8 Application and Implementation ........................ 10
8.1 Application Information............................................ 10
8.2 Typical Application ................................................. 10
9 Power Supply Recommendations...................... 12
10 Layout................................................................... 12
10.1 Layout Guidelines ................................................. 12
10.2 Layout Example .................................................... 12
11 Device and Documentation Support ................. 13
11.1 Documentation Support ........................................ 13
11.2 Community Resources.......................................... 13
11.3 Trademarks ........................................................... 13
11.4 Electrostatic Discharge Caution ............................ 13
11.5 Glossary ................................................................ 13
12 Mechanical, Packaging, and Orderable
Information ........................................................... 13
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (March 2000) to Revision A
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................ 1
• Deleted the VCC = 5 V and ISINK = 8 mA test condition row for the Output voltage drop parameter in the Electrical
Characteristics table ............................................................................................................................................................... 5
2 Submit Documentation Feedback
Product Folder Links: LM556
Copyright © 2000–2015, Texas Instruments Incorporated


Part Number LM556
Description Dual Timer
Maker etcTI
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