LM556CM/NOPB - National Semiconductor

www.fairchildsemi.com

Rev. 1.0.0

Features

• Replaces Two LM555/NE556 Timers

• Operates in Both Astable And Monostable Modes

•High Output Current

• TTL Compatible

• Timing From Microsecond To Hours

• Adjustable Duty Cycle

• Temperature Stability Of 0.005% Per °C

Applications

• Precision Timing

• Pulse Shaping

• Pulse Width Modulation

• Frequency Division

• Traffic Light Control

• Sequential Timing

• Pulse Generator

• Time Delay Generator

• Touch Tone Encoder

• Tone Burst Generator

Description

The LM556/NE556 series dual monolithic timing circuits

are a highly stable controller capable of producing accurate

time delays or oscillation. The LM556/NE556 is a dual

LM555. Timing is provided an external resistor and capaci-

tor for each timing function. The two timers operate inde-

pendently 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.

14-DIP

14-SOP

Internal Block Diagram

LM556/NE556

Dual Timer

LM556/NE556

Absolute Maximum Ratings (TA = 25°

°°

°C)

Parameter Symbol Value Unit

Supply Voltage VCC 16 V

Lead Temperature (soldering 10sec) TLEAD 300 °C

Power Dissipation PD600 mW

Operating Temperature Range

LM556/NE556 TOPR 0 ~ + 70 °C

Storage Temperature Range TSTG - 65 ~ + 150 °C

LM556/NE556

Electrical Characteristics

(TA = 25°C, VCC = 5 ~ 15V, unless otherwise specified)

Notes:

*1. Sup ply curre nt when out put is high i s typi cally 1.0mA less at VCC = 5V

*2. Tes ted at V CC = 5V and VCC = 15V

*3. This will d etermine t he maximum v alue of R A + R B for 15V operation.

The ma ximum tot al R = 20MΩ, and for 5V operation the maximum total R = 6.6MΩ.

*4. Matching characteristics refer to the difference between performance characteristics of each timer section in the monostable

mode.

*5. As reset voltage lowers, timing is inhibited and then the output goes low.

Parameter Symbol Conditions Min. Typ. Max. Units

Supply Voltage VCC -4.5-16V

Supply Current *1(two timers)

(low state) ICC VCC = 5V, RL = ∞

VCC = 15V, RL = ∞-5

16 12

30 mA

Timing Error *2(monostable)

Initial Accuracy

Drift with Temperature

Drift with Supply Voltage

ACCUR

∆t/∆T

∆t/∆VCC

RA = 2KΩ to 100KΩ

C = 0.1µF

T = 1.1RC -0.75

0.1 -%

ppm/°C

%/V

Control Voltage VC VCC = 15V 9.0 10.0 11.0 V

VCC = 5V 2.6 3.33 4.0 V

Threshold Voltage VTH VCC = 15V 8.8 10.0 11.2 V

VCC = 5V 2.4 3.33 4.2 V

Threshold Current*3ITH - - 30 250 nA

Trigger Voltage VTR VCC = 15V 4.5 5.0 5.6 V

VCC = 5V 1.1 1.6 2.2 V

Trigger Current ITR VTR = 0V - 0.01 2.0 µA

Reset Voltage*5VRST - 0.4 0.6 1.0 V

Reset Current IRST - - 0.03 0.6 mA

Low Output Voltage VOL

VCC = 15V

ISINK = 10mA

ISINK = 50mA

ISINK = 100mA

ISINK = 200mA

VCC = 5V

ISINK = 8mA

ISINK = 5mA

0.1

0.4

2.0

2.5

0.25

0.15

0.25

0.75

3.2

0.35

0.25

High Output Voltage VOH

VCC = 15V

ISOURCE = 200mA

ISOURCE = 100mA 12.75 12.5

13.3 -V

VCC = 5V

ISOURCE = 100mA 2.75 3.3 -V

Rise Time of Output tR- - 100 300 ns

Fall Time of Output tF- - 100 300 ns

Discharge Leakage Current ILKG - - 10 100 nA

Matching Characteristics*4

Initial Accuracy

Drift with Temperature

Drfit with Supply Voltage

ACCUR

∆t/∆T

∆t/∆VCC

1.0

0.2

2.0

0.5

ppm/°C

%/V

Timing Error (astable)*2

Initial Accuracy

Drift with Temperature

Drift with Supply Voltage

ACCUR

∆t/∆T

∆t/∆Vcc

VCC = 15V

RA,RB = 1KΩ to 100KΩ

C = 0.1µF-2.25

150

0.3 -%

ppm/°C

%/V

LM556/NE556

Mechanical Dimensions

Package

6.40 ±0.20

7.62

0.300

2.54

0.100

#7 #8

#14

0.252 ±0.008

0~15°

0.25

+0.10

–0.05

0.010

+0.004

–0.002

3.30 ±0.30

0.130 ±0.012

3.25 ±0.20

0.128 ±0.008

19.40 ±0.20

0.764 ±0.008

19.80

0.780 MAX

5.08

0.200

0.20

0.008

MAX

MIN

2.08

0.082

()

0.46 ±0.10

0.018 ±0.004

0.059 ±0.004

1.50 ±0.10

14-DIP

LM556/NE556

Mechanical Dimensions (Continued)

Package

8.56 ±0.20

0.337 ±0.008

1.27

0.050

5.72

0.225

1.55 ±0.10

0.061 ±0.004

0.05

0.002

6.00 ±0.30

0.236 ±0.012

3.95 ±0.20

0.156 ±0.008

0.60 ±0.20

0.024 ±0.008

8.70

0.343 MAX

#7 #8

0~8°

#14

0.47

0.019

()

1.80

0.071

MAX0.10

MAX0.004

MAX

MIN

+0.10

-0.05

0.20+0.004

-0.002

0.008

+0.10

-0.05

0.406+0.004

-0.002

0.016

14-SOP

LM556/NE556

Ordering Information

Product Number Package Operating Temperature

LM556CN 14-DIP

0 ~ + 70°C

LM556CM 14-SOP

NE556 14-DIP

NE556D 14-SOP

LM556/NE556

5/22/01 0.0m 001

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