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LMC555

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SNAS558M – FEBRUARY 2000 – REVISED JULY 2016

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8 Detailed Description

8.1 Overview

The LMC555 is a CMOS version of the industry standard 555 series general-purpose timers. In addition to the

standard package (SOIC, VSSSOP, and PDIP) the LMC555 is also available in a chip-sized package (8-bump

DSBGA) using TI’s DSBGA package technology. The LMC555 offers 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 astable mode, the oscillation frequency and duty cycle are accurately set by two external resistors and one

capacitor. The use of TI’s LMCMOS process extends both the frequency range and the low supply capability.

The LMC555 is available in an 8-pin PDIP, SOIC, VSSOP, and 8-bump DSBGA package.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Low-Power Dissipation

The LMC555 offers the same capability of generating accurate time delays and frequencies as the LM555 but

with much lower power dissipation. A power dissipation of less than 0.2 mW can be achieved with a 1.5-V

operating supply voltage and less than 1 mW with a 5-V operating supply voltage. The use of TI’s LMCMOS

process allows this low supply current and voltage capability. Reduced supply current spikes during output

transitions and extremely low reset, trigger and threshold currents also provide low power dissipation advantages

with the LMC555.