LMC555 CMOS Timer

1 Features

• Fast astable frequency of 3MHz

• Available in industry's smallest 8-bump DSBGA

package (1.43mm × 1.41mm)

• Less than 1mW typical power dissipation at 5V

supply

• 1.5V specified supply operating voltage

• output fully compatible with TTL and CMOS logic

at 5V supply

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

• Reduced supply current spikes during output

transitions

• Extremely low reset, trigger, and threshold currents

• Excellent temperature stability

• Pin-for-pin compatible with 555 series of timers

2 Applications

• Precision timing

• Pulse generation

• Sequential timing

• Time delay generation

• Pulse width modulation

• Pulse position modulation

• Linear ramp generators

3 Description

The LMC555 device is a CMOS version of the

industry standard 555 series general-purpose timers.

In addition to the standard SOIC, VSSSOP, and PDIP

packages, the LMC555 is also available in a chip-

sized, 8-bump DSBGA package 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 astable

mode, the oscillation frequency and duty cycle are

accurately set by two external resistors and one

capacitor. TI's LMCMOS process extends both the

frequency range and the low supply capability.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

LMC555

D (SOIC, 8)

4.9mm × 6mm

DGK (VSSOP, 8)

3mm × 4.9mm

P (PDIP, 8)

9.81mm × 9.43mm

YBF (DSBGA, 8)

1.75mm × 1.75mm

(1)

For more information, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

Pulse Width Modulator

Pulse Width Modulator Waveform:

Top Waveform—Modulation

Bottom Waveform—Output Voltage

LMC555

SNAS558N – JANUARY 2000 – REVISED MARCH 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.