LM556 - Dual Timer
Datasheet Packaging Samples & Pricing Reliability Reference Designs Application Notes Knowledge Base

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 200mA
•Output and supply TTL compatible
•Temperature stability better than 0.005% per °C
•Normally on and normally off output

 

General Description

The LM556 Dual timing circuit is a highly stable controller capable of producing accurate time delays or oscillation. More...


Applications

•Precision timing
•Pulse generation
•Sequential timing
•Time delay generation
•Pulse width modulation
•Pulse position modulation
•Linear ramp generator

ParametersValues
Temperature Min 0 deg C
Temperature Max 70 deg C

Additional Resources

Application Notes



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM556 Dual Timer 216
Kbytes		 29-Mar-00 Download
LM556 Mil-Aero Datasheet MNLM556-X 11 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM556CMSOIC NARROW14NOPB
STD		1
1		260
235		RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$0.58rail
of
55		NSUZXYTTE#
LM556CM
6 weeks1000
LM556CMXSOIC NARROW14NOPB
STD		1
1		260
235		RoHS N/A Full productionN/A
 
Buy Now 		1K+$0.58reel
of
2500		NSUZXYTTE#
LM556CM
6 weeks3000
LM556CNMDIP14NOPB
STD		1
1		NA
NA		RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$0.58rail
of
25		NSUZXYYTTE#
LM556CN
6 weeks1000
LM556 MD8Unpackaged DieFull productionN/A
  CALLtray
of
N/A		-
N/AN/A
LM556 MWCWaferFull productionN/A
  CALLwafer jar
of
N/A		-
N/AN/A

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM556J-MIL
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008

General Description

The LM556 Dual timing circuit is a highly stable controller capable 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 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.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM556 MWCSLM04404600353250011002356520
LM556CMSLM04404600353250011002356520
LM556CMXSLM04404600353250011002356520
LM556CNSLM04404600353250011002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.



Reference Designs
•RD-168 - Ambient Light Adaptive LED Driver

More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1566: Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs 370
Kbytes		 7-Feb-07 Download
AN-1566 (Japanese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
 442 Kbytes   Download
AN-1566 (Chinese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
 282 Kbytes  
AN-694: Application Note 694 A DMOS 3A, 55V, H-Bridge: The LMD18200 408
Kbytes		 26-Sep-02 Download
AN-694 (Japanese): Application Note 694 A DMOS 3A, 55V, H-Bridge: The LMD18200
 400 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 8-Nov-2009]