LM556 LM556C Dual Timer
February 1995
LM556 LM556C Dual Timer
General Description
The LM556 Dual timing circuit is a highly stable controller
capable of producing accurate time delays or oscillation
The 556 is a dual 555 Timing is provided by an external
resistor and capacitor for each timing function The two tim-
ers operate independently of each other sharing only V
CC
and ground The circuits may be triggered and reset on fall-
ing waveforms The output structures may sink or source
200 mA
Y
Y
Y
Y
Y
Adjustable duty cycle
Output can source or sink 200 mA
Output and supply TTL compatible
Temperature stability better than 0 005% per C
Normally on and normally off output
Applications
Y
Y
Y
Y
Y
Y
Y
Features
Y
Y
Y
Y
Direct replacement for SE556 NE556
Timing from microseconds through hours
Operates in both astable and monostable modes
Replaces two 555 timers
Precision timing
Pulse generation
Sequential timing
Time delay generation
Pulse width modulation
Pulse position modulation
Linear ramp generator
Schematic Diagram
TL H 7852 – 2
Connection Diagram
Dual-In-Line and Small Outline Packages
Order Number LM556J or LM556CJ
See NS Package Number J14A
Order Number LM556CM
See NS Package Number M14A
Order Number LM556CN
See NS Package Number N14A
TL H 7852 – 1
Top View
C
1995 National Semiconductor Corporation
TL H 7852
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
a
18V
Supply Voltage
Power Dissipation (Note 1)
LM556J LM556CJ
LM556CN
Operating Temperature Ranges
LM556C
LM556
1785 mW
1620 mW
0 C to
a
70 C
b
55 C to
a
125 C
Storage Temperature Range
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
Small Outline Package
Vapor phase (60 seconds)
Infrared (15 seconds)
b
65 C to
a
150 C
260 C
215 C
220 C
See AN-450 ‘‘Surface Mounting Methods and Their Effect
on Product Reliability’’ for other methods of soldering sur-
face mount devices
Electrical Characteristics
(T
A
e
25 C
Parameter
Supply Voltage
Supply Current
(Each Timer Section)
Timing Error Monostable
Initial Accuracy
Drift with Temperature
Accuracy over Temperature
Drift with Supply
Timing Error Astable
Initial Accuracy
Drift with Temperature
Accuracy over Temperature
Drift with Supply
Trigger Voltage
Trigger Current
Reset Voltage
Reset Current
Threshold Current
Control Voltage Level and
Threshold Voltage
Pin 1 13 Leakage Output High
Pin 1 13 Sat
Output Low
Output Low
(Note 4)
V
CC
e
5V R
L
e
%
V
CC
e
15V R
L
e
%
(Low State) (Note 2)
Conditions
V
CC
e a
5V to
a
15V unless otherwise specified)
LM556
Min
45
3
10
Typ
Max
18
5
11
Min
45
3
10
LM556C
Typ
Max
16
6
14
V
mA
mA
Units
R
A
e
1k to 100 kX C
e
0 1
mF
(Note 3)
05
30
15
0 05
15
90
25
0 15
48
1 45
5
1 67
01
04
05
01
52
19
05
1
04
01
250
10 4
38
100
240
100
9
26
04
45
1 25
0 75
50
15
01
2 25
150
30
0 30
5
1 67
02
05
01
0 03
10
3 33
1
180
80
55
20
10
1
06
01
250
11
4
100
300
200
%
ppm C
%
% V
%
ppm C
%
% V
V
V
mA
V
mA
mA
nA
V
V
nA
mV
mV
R
A
R
B
e
1k to 100 kX
C
e
0 1
mF
(Note 3)
V
CC
e
15V
V
CC
e
5V
V
TH
e
V-Control (Note 5)
V
TH
e
11 2V
V
CC
e
15V
V
CC
e
5V
96
29
0 03
10
3 33
1
(Note 6)
V
CC
e
15V I
e
15 mA
V
CC
e
4 5V I
e
4 5 mA
150
70
2
Electrical Characteristics
(T
A
e
25 C
Parameter
Output Voltage Drop (Low)
V
CC
e a
5V to
a
15V unless otherwise specified) (Continued)
LM556
Min
Typ
01
04
2
25
01
12 5
13 3
33
100
100
Max
0 15
05
2 25
Min
LM556C
Typ
01
04
2
25
Max
0 25
0 75
2 75
V
V
V
V
V
V
V
V
V
ns
ns
20
05
%
ppm C
% V
Units
Conditions
V
CC
e
15V
I
SINK
e
10 mA
I
SINK
e
50 mA
I
SINK
e
100 mA
I
SINK
e
200 mA
V
CC
e
5V
I
SINK
e
8 mA
I
SINK
e
5 mA
I
SOURCE
e
200 mA V
CC
e
15V
I
SOURCE
e
100 mA V
CC
e
15V
V
CC
e
5V
13
3
0 25
0 25
12 75
2 75
12 5
13 3
33
100
100
02
02
01
g
10
02
0 35
Output Voltage Drop (High)
Rise Time of Output
Fall Time of Output
Matching Characteristics
Initial Timing Accuracy
Timing Drift with Temperature
Drift with Supply Voltage
(Note 7)
0 05
g
10
01
Note 1
For operating at elevated temperatures the device must be derated based on a
a
150 C maximum junction temperature and a thermal resistance of
70 C W (Ceramic) 77 C W (Plastic DIP) and 110 C W (SO-14 Narrow)
Note 2
Supply current when output high typically 1 mA less at V
CC
e
5V
Note 3
Tested at V
CC
e
5V and V
CC
e
15V
Note 4
As reset voltage lowers timing is inhibited and then the output goes low
Note 5
This will determine the maximum value of R
A
a
R
B
for 15V operation The maximum total (R
A
a
R
B
) is 20 MX
Note 6
No protection against excessive pin 1 13 current is necessary providing the package dissipation rating will not be exceeded
Note 7
Matching characteristics refer to the difference between performance characteristics of each timer section
Note 8
Refer to RETS556X drawing for specifications of military LM556J version
3
Typical Performance Characteristics
Minimum Pulse Width
Required for Triggering
Supply Current vs Supply
Voltage (Each Section)
High Output Voltage vs
Output Source Current
Low Output Voltage vs
Output Sink Current
Low Output Voltage vs
Output Sink Current
Low Output Voltage vs
Output Sink Current
Output Propagation Delay vs
Voltage Level of Trigger Pulse
Output Propagation Delay vs
Voltage Level of Trigger Pulse
Discharge Transistor
(Pin 1 13)
Voltage vs Sink Current
Discharge Transistor (Pin 1 13)
Voltage vs Sink Current
TL H 7852 – 3
4
Physical Dimensions
inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number LM556J or LM556CJ
NS Package Number J14A
S O Molded Package (M)
Order Number LM556CM
NS Package Number M14A
5
NXP MCU
