Datasheet LM556J-MIL, LM556CN, LM556CM, LM556CMX Datasheet (NSC)

LM556
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 timers oper­ate 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

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

Dual-In-Line, Small Outline Packages

DS007852-1

Top View

March 2000

LM556 Dual Timer

© 2000 National Semiconductor Corporation DS007852 www.national.com

Schematic Diagram

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LM556

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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 +18V

Power Dissipation (Note 2)

LM556CM 410 mW
LM556CN 1620 mW

Operating Temperature Ranges

LM556C 0˚C to +70˚C

Storage Temperature Range −65˚C to +150˚C

Soldering Information

Dual-In-Line Package

Soldering (10 Seconds) 260˚C

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.

Electrical Characteristics

(TA= 25˚C, VCC= +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, RL=

∞

VCC= 15V, RL=

∞

(Low State) (Note 3)

3

10

6

14 mA

Timing Error, Monostable

Initial Accuracy 0.75 %
Drift with Temperature R

A

= 1k to 100kΩ, 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,RB

= 1k to 100kΩ, 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

LM556

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Electrical Characteristics (Continued)

(TA= 25˚C, VCC= +5V to +15V, unless otherwise specified)

Parameter Conditions Limits Units

LM556C

Min Typ Max

Output Voltage Drop (High) I

SOURCE

= 200mA, VCC= 15V 12.5 V

I

SOURCE

= 100mA, VCC= 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 temperaturesthedevice 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 VCC= 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+RB

for 15V operation. The maximum total (RA+RB)is20MΩ.

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.

Typical Performance Characteristics

Minimum Pulse Width Required for Triggering

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Supply Current vs. Supply Voltage (Each Section)

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LM556

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Typical Performance Characteristics (Continued)

High Output Voltage vs. Output Source Current

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Low Output Voltage vs. Output Sink Current

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Low Output Voltage vs. Output Sink Current

DS007852-7

Low Output Voltage vs. Output Sink Current

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Output Propagation Delay vs. Voltage Level of Trigger
Pulse

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Output Propagation Delay vs. Voltage Level of Trigger
Pulse

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LM556

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Typical Performance Characteristics (Continued)

Discharge Transistor (Pin 1, 13) Voltage vs. Sink
Current

DS007852-11

Discharge Transistor (Pin 1, 13) Voltage vs. Sink
Current

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LM556

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Physical Dimensions inches (millimeters) unless otherwise noted

Small Outline Package (M)

NS Package Number M14A

14-Lead (0.118” Wide) Molded Mini Small Outline Package

NS Package Number N14A

LM556

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Notes

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significant injury to the user.

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support device or system whose failure to perform
can be reasonably expected to cause the failure of
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LM556 Dual Timer

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.