SNAS549A March 2000  – October 2015 LM556

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Operating Characteristics
      2. 7.3.2Timing from Microseconds Through Hours
    4. 7.4Device Functional Modes
      1. 7.4.1Monostable Mode
      2. 7.4.2Astable (Free-Running) Mode
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
      3. 8.2.3Application Curve
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
      1. 11.1.1Related Documentation
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

1 Features

  • 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 NUMBERPACKAGEBODY SIZE (NOM)
LM556SOIC (14)3.91 mm × 8.65 mm
PDIP (14)6.35 mm × 19.177 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Schematic Diagram

LM556 snas549_sch.gif