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www.fairchildsemi.com
LM556/NE556
Dual Timer
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
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 V
CC
and ground. The
circuits may be triggered and reset on falling waveforms.
The output structures may sink or source 200mA.
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
14-DIP
14-SOP
1
1
Internal Block Diagram
Rev. 1.0.0
©2001 Fairchild Semiconductor Corporation
LM556/NE556
Electrical Characteristics
(T
A
= 25°C, V
CC
= 5 ~ 15V, unless otherwise specified)
Parameter
Supply Voltage
Supply Current *
1
(two timers)
(low state)
Timing Error *
2
(monostable)
Initial Accuracy
Drift with Temperature
Drift with Supply Voltage
Control Voltage
Threshold Voltage
Threshold Current*
3
Trigger Voltage
Trigger Current
Reset Voltage*
5
Reset Current
Symbol
V
CC
I
CC
ACCUR
∆t/∆T
∆t/∆V
CC
V
C
V
TH
I
TH
V
TR
I
TR
V
RST
I
RST
V
CC
= 15V
V
CC
= 5V
V
TR
= 0V
-
-
V
CC
= 15V
I
SINK
= 10mA
I
SINK
= 50mA
I
SINK
= 100mA
I
SINK
= 200mA
V
CC
= 5V
I
SINK
= 8mA
I
SINK
= 5mA
V
CC
= 15V
I
SOURCE
= 200mA
I
SOURCE
= 100mA
V
CC
= 5V
I
SOURCE
= 100mA
Rise Time of Output
Fall Time of Output
Discharge Leakage Current
Matching Characteristics*
4
Initial Accuracy
Drift with Temperature
Drfit with Supply Voltage
Timing Error (astable)*
2
Initial Accuracy
Drift with Temperature
Drift with Supply Voltage
t
R
t
F
I
LKG
ACCUR
∆t/∆T
∆t/∆V
CC
ACCUR
∆t/∆T
∆t/∆Vcc
-
-
-
-
Conditions
-
V
CC
= 5V, R
L
=
∞
V
CC
= 15V, R
L
=
∞
R
A
= 2KΩ to 100KΩ
C = 0.1µF
T = 1.1RC
V
CC
= 15V
V
CC
= 5V
V
CC
= 15V
V
CC
= 5V
-
Min.
4.5
-
Typ.
-
5
16
0.75
50
0.1
10.0
3.33
10.0
3.33
30
5.0
1.6
0.01
0.6
0.03
0.1
0.4
2.0
2.5
0.25
0.15
12.5
13.3
3.3
100
100
10
1.0
10
0.2
2.25
150
0.3
Max.
16
12
30
-
11.0
4.0
11.2
4.2
250
5.6
2.2
2.0
1.0
0.6
0.25
0.75
3.2
0.35
0.25
-
-
300
300
100
2.0
0.5
-
Units
V
mA
mA
%
ppm/°C
%/V
V
V
V
V
nA
V
V
µA
V
mA
V
-
9.0
2.6
8.8
2.4
-
4.5
1.1
-
0.4
-
Low Output Voltage
V
OL
-
V
V
High Output Voltage
V
OH
12.75
2.75
-
-
-
-
V
ns
ns
nA
%
ppm/°C
%/V
%
ppm/°C
%/V
V
CC
= 15V
R
A
,R
B
= 1KΩ to 100KΩ
C = 0.1µF
-
Notes:
*1. Supply current when output is high is typically 1.0mA less at V
CC
= 5V
*2. Tested at V
CC
= 5V and V
CC
= 15V
*3. This will determine the maximum value of R
A
+ R
B
for 15V operation.
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.
3
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