Fairchild LM556, NE556 service manual

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LM556/NE556

Dual Timer

www.fairchildsemi.com

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

Internal Block Diagram

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 capaci­tor for each timing function. The two timer s operate inde­pendently of each other, sharing only V
circuits may be triggered and reset on falling waveforms.
The output structures may sink or source 200mA.

14-DIP

1

14-SOP

and ground. The

CC

1

©2001 Fairchild Semiconductor Corporation

Rev. 1.0.0

LM556/NE556

Absolute Maximum Ratings (TA = 25°°°°C)

Parameter Symbol Value Unit

Supply Voltage V
Lead Temperature (soldering 10sec) T
Power Dissipation P

CC

LEAD

D

16 V
300 °C
600 mW

Operating Temperature Range
LM556/NE556

Storage Temperature Range T

T

OPR

STG

0 ~ + 70 °C

- 65 ~ + 150 °C

2

Electrical Characteristics

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

Parameter Symbol Conditions Min. Typ. Max. Units

Supply Voltage V
Supply Current *

(two timers)

1

(low state)
Timing Error *

(monostable)

2

Initial Accuracy
Drift with Temperature
Drift with Supply Voltage

Control Voltage V

Threshold Voltage V

Threshold Current*

3

Trigger Voltage V

Trigger Current I
Reset Voltage*

5

Reset Current I

Low Output Voltage V

High Output Voltage V

Rise Time of Output t
Fall Time of Output t
Discharge Leakage Current I
Matching Characteristics*

4

Initial Accuracy
Drift with Temperature
Drfit with Supply Voltage

2

Timing Error (astable)*
Initial Accuracy
Drift with Temperature
Drift with Supply Voltage

CC

I

CC

ACCUR

∆t/∆T

∆t/∆V

CC

C

TH

I

TH

TR

TR

V

RST

RST

OL

OH

R

F

LKG

ACCUR

∆t/∆T

∆t/∆V

CC

ACCUR

∆t/∆T

∆t/∆Vcc

VCC = 5V, RL = ∞
V

CC

R

A

C = 0.1µF
T = 1.1RC

VCC = 15V 9.0 10.0 11.0 V
V

CC

VCC = 15V 8.8 10.0 11.2 V
V

CC

VCC = 15V 4.5 5.0 5.6 V
V

CC

V

TR

VCC = 15V
I

SINK

I

SINK

I

SINK

I

SINK

V

CC

I

SINK

I

SINK

VCC = 15V
I
I

V

CC

I

V

CC

R

A,RB

C = 0.1µF

-4.5-16V

= 15V, RL = ∞

= 2KΩ to 100KΩ

-

-

5

16

0.75
50

12
30

-

0.1

= 5V 2.6 3.33 4.0 V

= 5V 2.4 3.33 4.2 V

- - 30 250 nA

= 5V 1.1 1.6 2.2 V

= 0V - 0.01 2.0 µA

- 0.4 0.6 1.0 V

- - 0.03 0.6 mA

= 10mA
= 50mA

= 100mA

= 200mA

-

0.1

0.4

2.0

2.5

0.25

0.75

3.2

= 5V

= 8mA
= 5mA

SOURCE
SOURCE

= 5V

SOURCE

= 200mA
= 100mA 12.75

= 100mA 2.75 3.3

0.25

0.15

12.5

13.3

0.35

0.25

-V

-

- - 100 300 ns

- - 100 300 ns

- - 10 100 nA

--

= 15V

= 1KΩ to 100KΩ

1.0
10

0.2

2.25

-

150

2.0

0.5

-

0.3

LM556/NE556

mA
mA

%

ppm/°C

%/V

V

V

V

%

ppm/°C

%/V

%

ppm/°C

%/V

Notes:

*1. Supply curr ent when output is high is typically 1.0m A less at V
*2. Tested at V
*3. This will determine the maxi mum value of R

The maximum total 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.

= 5V and VCC = 15V

CC

+ RB for 15V operation.

A

CC

= 5V

3