2001 Fairchild Semiconductor Corporation
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 V
CC
and ground. The
circuits may be triggered and reset on falling waveforms.
The output structures may sink or source 200mA.
14-DIP
1
14-SOP
1
Internal Block Diagram
LM556/NE556
Dual Timer
LM556/NE556
2
Absolute Maximum Ratings (T
A
= 25
C)
Parameter
Symbol
Value
Unit
Supply Voltage
V
CC
16
V
Lead Temperature (soldering 10sec)
T
LEAD
300
C
Power Dissipation
P
D
600
mW
Operating Temperature Range
LM556/NE556
T
OPR
0 ~ + 70
C
Storage Temperature Range
T
STG
- 65 ~ + 150
C
LM556/NE556
3
Electrical Characteristics
(T
A
= 25
C, V
CC
= 5 ~ 15V, unless otherwise specified)
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 = 20M
, and for 5V operation the maximum total R = 6.6M
.
*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
V
CC
-
4.5
-
16
V
Supply Current *
1
(two timers)
(low state)
I
CC
V
CC
= 5V, R
L
=
V
CC
= 15V, R
L
=
-
5
16
12
30
mA
mA
Timing Error *
2
(monostable)
Initial Accuracy
Drift with Temperature
Drift with Supply Voltage
ACCUR
t/
T
t/
V
CC
R
A
= 2K
to 100K
C = 0.1
F
T = 1.1RC
-
0.75
50
0.1
-
%
ppm/
C
%/V
Control Voltage
V
C
V
CC
= 15V
9.0
10.0
11.0
V
V
CC
= 5V
2.6
3.33
4.0
V
Threshold Voltage
V
TH
V
CC
= 15V
8.8
10.0
11.2
V
V
CC
= 5V
2.4
3.33
4.2
V
Threshold Current*
3
I
TH
-
-
30
250
nA
Trigger Voltage
V
TR
V
CC
= 15V
4.5
5.0
5.6
V
V
CC
= 5V
1.1
1.6
2.2
V
Trigger Current
I
TR
V
TR
= 0V
-
0.01
2.0
A
Reset Voltage*
5
V
RST
-
0.4
0.6
1.0
V
Reset Current
I
RST
-
-
0.03
0.6
mA
Low Output Voltage
V
OL
V
CC
= 15V
I
SINK
= 10mA
I
SINK
= 50mA
I
SINK
= 100mA
I
SINK
= 200mA
V
CC
= 5V
I
SINK
= 8mA
I
SINK
= 5mA
-
0.1
0.4
2.0
2.5
0.25
0.15
0.25
0.75
3.2
0.35
0.25
V
V
High Output Voltage
V
OH
V
CC
= 15V
I
SOURCE
= 200mA
I
SOURCE
= 100mA
12.75
12.5
13.3
-
V
V
CC
= 5V
I
SOURCE
= 100mA
2.75
3.3
-
V
Rise Time of Output
t
R
-
-
100
300
ns
Fall Time of Output
t
F
-
-
100
300
ns
Discharge Leakage Current
I
LKG
-
-
10
100
nA
Matching Characteristics*
4
Initial Accuracy
Drift with Temperature
Drfit with Supply Voltage
ACCUR
t/
T
t/
V
CC
-
-
1.0
10
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
V
CC
= 15V
R
A
,R
B
= 1K
to 100K
C = 0.1
F
-
2.25
150
0.3
-
%
ppm/
C
%/V
LM556/NE556
4
Mechanical Dimensions
Package
6.40
0.20
7.62
0.300
2.54
0.100
#1
#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
5
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
#1
#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
6
Ordering Information
Product Number
Package
Operating Temperature
LM556CN
14-DIP
0 ~ + 70
C
LM556CM
14-SOP
NE556
14-DIP
NE556D
14-SOP
LM556/NE556
7
LM556/NE556
5/22/01 0.0m 001
Stock#DSxxxxxxxx
2001 Fairchild Semiconductor Corporation
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
PDF 
ZIP