ELM460
Impossible Oscillator
Description
Features
The ELM460 is a complete astable oscillator
• Requires no external components
circuit in an 8 pin package. The circuit (impossibly!)
requires no external components to operate, as all
timing is generated internally.
• Low power CMOS design - typically 1mA at 5V
• Wide supply range - 3.0 to 5.5 volt operation
• Provides periods from 0.1 to 600 seconds
• High current drive outputs - up to 25 mA
Immediately after power-up, the ELM460 begins
to oscillate continuously at a frequency determined
by the logic levels on the configuration inputs. At the
end of every period, the circuit again reads these
configuration settings, and automatically adapts to
any changes that are made.
Two outputs are provided, an active high output
and it’s logical inverse. The circuit output is always a
50msec pulse, independent of the time period
selected.
Connection Diagram
PDIP and SOIC
(top view)
Applications
1
2
3
4
8
7
6
5
VDD
P1
VSS
Out
Out
M0
• Time Base Generator
• Power Gating Controller
• LED Flasher
P0
M1
• Programmable Timer
Block Diagram
Base Period
Generator
Rate
Multiplier
50ms Pulse
Generator
7
6
Out
Out
2
3
4
5
P1
P0
M1
M0
P1
P0
Period
1 sec
2 sec
5 sec
6 sec
M1
L
M0 Multiplier
L
L
L
H
L
L
H
L
0.1
1
L
H
H
H
H
10
100
H
H
ELM460DSB
Elm Electronics – Circuits for the Hobbyist
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