NSC LM555J-883, LM555H-883, LM555H-MLS, LM555CMX, LM555CMMX Datasheet

February 2000

LM555

Timer

General Description

The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200mA or drive TTL circuits.

Features

nDirect replacement for SE555/NE555

nTiming from microseconds through hours

nOperates in both astable and monostable modes

nAdjustable duty cycle

nOutput can source or sink 200 mA

nOutput and supply TTL compatible

nTemperature stability better than 0.005% per ÊC

nNormally on and normally off output

nAvailable in 8-pin MSOP package

Applications

nPrecision timing

nPulse generation

nSequential timing

nTime delay generation

nPulse width modulation

nPulse position modulation

nLinear ramp generator

Schematic Diagram

DS007851-1

Timer LM555

© 2000 National Semiconductor Corporation

DS007851

www.national.com

LM555

Connection Diagram

Dual-In-Line, Small Outline

and Molded Mini Small Outline Packages

			DS007851-3
		Top View
Ordering Information
Package	Part Number	Package Marking	Media Transport	NSC Drawing
8-Pin SOIC	LM555CM	LM555CM	Rails	M08A
	LM555CMX	LM555CM	2.5k Units Tape and Reel
8-Pin MSOP	LM555CMM	Z55	1k Units Tape and Reel	MUA08A
	LM555CMMX	Z55	3.5k Units Tape and Reel
8-Pin MDIP	LM555CN	LM555CN	Rails	N08E

www.national.com

2

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Supply Voltage	+18V
Power Dissipation (Note 3)
LM555CM, LM555CN	1180 mW
LM555CMM	613 mW
Operating Temperature Ranges
LM555C	0ÊC to +70ÊC
Storage Temperature Range	−65ÊC to +150ÊC

Soldering Information
Dual-In-Line Package
Soldering (10 Seconds)	260ÊC
Small Outline Packages
(SOIC and MSOP)
Vapor Phase (60 Seconds)	215ÊC
Infrared (15 Seconds)	220ÊC

See AN-450 ªSurface Mounting Methods and Their Effect on Product Reliabilityº for other methods of soldering surface mount devices.

Electrical Characteristics (Notes 1, 2)

(TA = 25ÊC, VCC = +5V to +15V, unless othewise specified)

Parameter	Conditions		Limits		Units
			LM555C
		Min	Typ	Max
Supply Voltage		4.5		16	V
Supply Current	VCC = 5V, RL = ∞		3	6
	VCC = 15V, RL = ∞		10	15	mA
	(Low State) (Note 4)
Timing Error, Monostable
Initial Accuracy			1		%
Drift with Temperature	RA = 1k to 100kΩ,		50		ppm/ÊC
	C = 0.1µF, (Note 5)
Accuracy over Temperature			1.5		%
Drift with Supply			0.1		%/V
Timing Error, Astable
Initial Accuracy			2.25		%
Drift with Temperature	RA, RB = 1k to 100kΩ,		150		ppm/ÊC
	C = 0.1µF, (Note 5)
Accuracy over Temperature			3.0		%
Drift with Supply			0.30		%/V
Threshold Voltage			0.667		x VCC
Trigger Voltage	VCC = 15V		5		V
	VCC = 5V		1.67		V
Trigger Current			0.5	0.9	µA
Reset Voltage		0.4	0.5	1	V
Reset Current			0.1	0.4	mA
Threshold Current	(Note 6)		0.1	0.25	µA
Control Voltage Level	VCC = 15V	9	10	11	V
	VCC = 5V	2.6	3.33	4
Pin 7 Leakage Output High			1	100	nA
Pin 7 Sat (Note 7)
Output Low	VCC = 15V, I7 = 15mA		180		mV
Output Low	VCC = 4.5V, I7 = 4.5mA		80	200	mV

LM555

3	www.national.com

LM555

Electrical Characteristics (Notes 1, 2) (Continued)

(TA = 25ÊC, VCC = +5V to +15V, unless othewise specified)

Parameter	Conditions		Limits		Units
			LM555C
		Min	Typ	Max
Output Voltage Drop (Low)	VCC = 15V
	ISINK = 10mA		0.1	0.25	V
	ISINK = 50mA		0.4	0.75	V
	ISINK = 100mA		2	2.5	V
	ISINK = 200mA		2.5		V
	VCC = 5V
	ISINK = 8mA				V
	ISINK = 5mA		0.25	0.35	V
Output Voltage Drop (High)	ISOURCE = 200mA, VCC = 15V		12.5		V
	ISOURCE = 100mA, VCC = 15V	12.75	13.3		V
	VCC = 5V	2.75	3.3		V
Rise Time of Output			100		ns
Fall Time of Output			100		ns

Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance.

Note 3: For operating at elevated temperatures the device must be derated above 25ÊC based on a +150ÊC maximum junction temperature and a thermal resistance of 106ÊC/W (DIP), 170ÊC/W (S0-8), and 204ÊC/W (MSOP) junction to ambient.

Note 4: Supply current when output high typically 1 mA less at VCC = 5V. Note 5: Tested at VCC = 5V and VCC = 15V.

Note 6: This will determine the maximum value of RA + RB for 15V operation. The maximum total (RA + RB) is 20MΩ.

Note 7: No protection against excessive pin 7 current is necessary providing the package dissipation rating will not be exceeded.

Note 8: Refer to RETS555X drawing of military LM555H and LM555J versions for specifications.

www.national.com

4