LMC555 CMOS Timer
February 2000
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-
conductor’s LMCMOS
™
process extends both the frequency
range and low supply capability.
Features
n
n
n
n
n
n
n
n
n
n
Less than 1 mW typical power dissipation at 5V supply
3 MHz astable frequency capability
1.5V supply operating voltage guaranteed
Output fully compatible with TTL and CMOS logic at 5V
supply
Tested to −10 mA, +50 mA 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
Available in 8 pin MSOP Package and 8-Bump micro
SMD package
Block and Connection Diagrams
8-Pin SOIC, MSOP,
and MDIP Packages
8-Bump micro SMD
DS008669-1
Top View
Top View
(bump side down)
DS008669-9
LMCMOS
™
is a trademark of National Semiconductor Corp.
© 2000 National Semiconductor Corporation
DS008669
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
