LM555CMMX National Semiconductor, LM555CMMX Datasheet



Manufacturer Part Number
National Semiconductor

Specifications of LM555CMMX

# Internal Timers
Power Dissipation
Operating Supply Voltage (min)
Operating Supply Voltage (typ)
Operating Supply Voltage (max)
Package Type
High Level Output Current
Low Level Output Current
Pin Count
Operating Temp Range
0C to 70C
Operating Temperature Classification
Surface Mount
Lead Free Status / RoHS Status
Not Compliant
© 2006 National Semiconductor Corporation
General Description
The LM555 is a highly stable device for generating accurate
time delays or oscillation. Additional terminals are provided
for triggering or resetting if desired. In the time delay mode of
operation, the time is precisely controlled by one external
resistor and capacitor. For astable operation as an oscillator,
the free running frequency and duty cycle are accurately
controlled with two external resistors and one capacitor. The
circuit may be triggered and reset on falling waveforms, and
the output circuit can source or sink up to 200mA or drive
TTL circuits.
Schematic Diagram
n Direct replacement for SE555/NE555
n Timing from microseconds through hours
n Operates in both astable and monostable modes
n Adjustable duty cycle
n Output can source or sink 200 mA
n Output and supply TTL compatible
n Temperature stability better than 0.005% per ˚C
n Normally on and normally off output
n Available in 8-pin MSOP package
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
July 2006

Related parts for LM555CMMX

LM555CMMX Summary of contents

Page 1

... TTL circuits. Schematic Diagram © 2006 National Semiconductor Corporation Features n Direct replacement for SE555/NE555 n Timing from microseconds through hours n Operates in both astable and monostable modes ...

Page 2

... Connection Diagram Ordering Information Package Part Number 8-Pin SOIC LM555CM LM555CMX 8-Pin MSOP LM555CMM LM555CMMX 8-Pin MDIP LM555CN www.national.com Dual-In-Line, Small Outline and Molded Mini Small Outline Packages Top View Package Marking LM555CM LM555CM 2.5k Units Tape and Reel Z55 1k Units Tape and Reel Z55 3 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Power Dissipation (Note 3) LM555CM, LM555CN LM555CMM Operating Temperature Ranges LM555C Storage Temperature Range Electrical Characteristics (T = 25˚ +5V to +15V, unless othewise specified) ...

Page 4

Electrical Characteristics (T = 25˚ +5V to +15V, unless othewise specified Parameter Output Voltage Drop (Low) Output Voltage Drop (High) Rise Time of Output Fall Time of Output Note 1: All voltages are measured with respect ...

Page 5

Typical Performance Characteristics Minimuim Pulse Width Required for Triggering High Output Voltage vs. Output Source Current Low Output Voltage vs. Output Sink Current 00785104 Low Output Voltage vs. 00785120 Low Output Voltage vs. 00785122 5 Supply Current vs. Supply Voltage ...

Page 6

Typical Performance Characteristics Output Propagation Delay vs. Voltage Level of Trigger Pulse Discharge Transistor (Pin 7) Voltage vs. Sink Current www.national.com (Continued) Output Propagation Delay vs. Voltage Level of Trigger Pulse 00785124 Discharge Transistor (Pin 7) Voltage vs. Sink Current ...

Page 7

Applications Information MONOSTABLE OPERATION In this mode of operation, the timer functions as a one-shot (Figure 1). The external capacitor is initially held discharged by a transistor inside the timer. Upon application of a nega- tive trigger pulse of less ...

Page 8

Applications Information Figure 5 shows the waveforms generated in this mode of operation Top Trace: Output 5V/Div. CC TIME = 20µs/DIV. Bottom Trace: Capacitor Voltage 1V/Div 3.9kΩ 3kΩ 0.01µF ...

Page 9

Applications Information Top Trace: Modulation 1V/Div. CC TIME = 0.2 ms/DIV. Bottom Trace: Output Voltage 2V/Div 9.1kΩ 0.01µF FIGURE 9. Pulse Width Modulator PULSE POSITION MODULATOR This application uses the timer connected ...

Page 10

Applications Information Top Trace: Input 3V/Div. CC TIME = 20µs/DIV. Middle Trace: Output 5V/Div 47kΩ Bottom Trace: Capacitor Voltage 1V/Div 100kΩ 2.7 kΩ 0.01 µF FIGURE ...

Page 11

Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.118” Wide) Molded Mini Small Outline Package Small Outline Package (M) NS Package Number M08A NS Package Number MUA08A 11 www.national.com ...

Page 12

... BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. ...

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