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LM556 Dual Timer
March 2000
LM556
Dual Timer
General Description
The LM556 Dual timing circuit is a highly stable controller ca-
pable 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 timers oper-
ate independently 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.
Features
n Direct replacement for SE556/NE556
n Timing from microseconds through hours
n Operates in both astable and monostable modes
n Replaces two 555 timers
n Adjustable duty cycle
n Output can source or sink 200mA
n Output and supply TTL compatible
n Temperature stability better than 0.005% per ˚C
n Normally on and normally off output
Applications
n Precision timing
n Pulse generation
n Sequential timing
n Time delay generation
n Pulse width modulation
n Pulse position modulation
n Linear ramp generator
Connection Diagram
Dual-In-Line, Small Outline Packages
DS007852-1
Top View
Ordering Information
Package
Part Number
Package Marking
Media Transport
NSC Drawing
14-Pin SOIC
LM556CM
LM556CM
Rails
M14A
LM556CMX
LM556CM
2.5k Units Tape and Reel
14-Pin MDIP
LM556CN
LM556CN
Rails
N14a
© 2000 National Semiconductor Corporation
DS007852
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Schematic Diagram
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature Range
−65˚C to +150˚C
Soldering Information
Dual-In-Line Package
Soldering (10 Seconds)
260˚C
+18V
Small Outline Packages
Vapor Phase (60 Seconds) 215˚C
Infrared (15 Seconds) 220˚C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Power Dissipation (Note 2)
LM556CM
410 mW
LM556CN
1620 mW
Operating Temperature Ranges
LM556C
0˚C to +70˚C
Electrical Characteristics
(T A = 25˚C, V CC = +5V to +15V, unless otherwise specified)
Parameter
Conditions
Limits
Units
LM556C
Min
Typ
Max
Supply Voltage
4.5
16
V
Supply Current
(Each Timer Section)
V CC = 5V, R L = ¥
V CC = 15V, R L = ¥
(Low State) (Note 3)
3
10
6
14
mA
Timing Error, Monostable
Initial Accuracy
0.75
%
Drift with Temperature
R A = 1k to 100k
W
,
50
ppm/˚C
C = 0.1µF, (Note 4)
Accuracy over Temperature
1.5
%
Drift with Supply
0.1
%/V
Timing Error, Astable
Initial Accuracy
2.25
%
Drift with Temperature
R A ,R B = 1k to 100k
W
,
150
ppm/˚C
Accuracy over Temperature
C = 0.1µF, (Note 4)
3.0
%
Drift with Supply
0.30
%/V
Trigger Voltage
V CC = 15V
4.5
5
5.5
V
V CC = 5V
1.25
1.67
2.0
V
Trigger Current
0.2
1.0
µA
Reset Voltage
0.4
0.5
1
V
Reset Current
0.1
0.6
mA
Threshold Current
V TH = V-Control (Note 6)
V TH = 11.2V
0.03
0.1
250
µA
nA
Control Voltage Level and
Threshold Voltage
V CC = 15V
V CC =5V
9
2.6
10
3.33
11
4
V
Pin 1, 13
Leakage Output High
1
100
nA
Pin 1, 13 Sat
(Note 7)
Output Low
V CC = 15V, I = 15mA
180
300
mV
Output Low
V CC = 4.5V, I = 4.5mA
80
200
mV
Output Voltage Drop (Low)
V CC = 15V
I SINK = 10mA
0.1
0.25
V
I SINK = 50mA
0.4
0.75
V
I SINK = 100mA
2
2.75
V
I SINK = 200mA
2.5
V
V CC =5V
I SINK = 8mA
V
I SINK = 5mA
0.25
0.35
V
3
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Electrical Characteristics (Continued)
(T A = 25˚C, V CC = +5V to +15V, unless otherwise specified)
Parameter
Conditions
Limits
Units
LM556C
Min
Typ
Max
Output Voltage Drop (High)
I SOURCE = 200mA, V CC = 15V
12.5
V
I SOURCE = 100mA, V CC = 15V
12.75
13.3
V
V CC = 5V
2.75
3.3
V
Rise Time of Output
100
ns
Fall Time of Output
100
ns
Matching Characteristics
(Note 8)
Initial Timing Accuracy
0.1
2.0
%
Timing Drift with Temperature
± 10
ppm/˚C
Drift with Supply Voltage
0.2
0.5
%/V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: For operating at elevated temperatures the device must be derated based on a +150˚C maximum junction temperature and a thermal resistance of 77˚C/W
(Plastic Dip), and 110˚C/W (SO-14 Narrow).
Note 3: Supply current when output high typically 1mA less at V CC =5V.
Note 4: Tested at V CC = 5V and V CC = 15V.
Note 5: As reset voltage lowers, timing is inhibited and then the output goes low.
Note 6: This will determine the maximum value of R A +R B for 15V operation. The maximum total (R A +R B )is20M
W
Typical Performance Characteristics
Minimum Pulse Width Required for Triggering
Supply Current vs. Supply Voltage (Each Section)
DS007852-3
DS007852-4
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.
Note 7: No protection against excessive pin 1, 13 current is necessary providing the package dissipation rating will not be exceeded.
Note 8: Matching characteristics refer to the difference between performance characteristics of each timer section.
Note 9: Refer to RETS556X drawing of military LM556J versions.
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Typical Performance Characteristics (Continued)
High Output Voltage vs. Output Source Current
Low Output Voltage vs. Output Sink Current
DS007852-5
DS007852-6
Low Output Voltage vs. Output Sink Current
Low Output Voltage vs. Output Sink Current
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Output Propagation Delay vs. Voltage Level of Trigger
Pulse
Output Propagation Delay vs. Voltage Level of Trigger
Pulse
DS007852-9
DS007852-10
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