LMC555

CMOS Timer

General Description

The LMC555 is a CMOS version of the industry standard

555 series general purpose timers. In addition to the stan-

dard package (SOIC, MSOP, and MDIP) the LMC555 is also

available in a chip sized package (8 Bump micro SMD) using

National’s micro SMD package technology. The LMC555 of-

fers the same capability of generating accurate time delays

and frequencies as the LM555 but with much lower power

dissipation and supply current spikes. When operated as a

one-shot, the time delay is precisely controlled by a single

external resistor and capacitor. In the stable mode the oscil-

lation frequency and duty cycle are accurately set by two ex-

ternal resistors and one capacitor. The use of National Semi-

range and low supply capability.

Features

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Less than 1 mW typical power dissipation at 5V supply

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3 MHz astable frequency capability

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1.5V supply operating voltage guaranteed

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Output fully compatible with TTL and CMOS logic at 5V

supply

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Tested to −10 mA, +50 mA output current levels

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Reduced supply current spikes during output transitions

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Extremely low reset, trigger, and threshold currents

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Excellent temperature stability

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Pin-for-pin compatible with 555 series of timers

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Available in 8 pin MSOP Package and 8-Bump micro

SMD package

Block and Connection Diagrams

8-Pin SOIC, MSOP,

and MDIP Packages

DS008669-1

Top View

8-Bump micro SMD

DS008669-9

Top View

(bump side down)

February 2000

© 2000 National Semiconductor Corporation

DS008669

www.national.com