ELM446
Electrical Characteristics
All values are for operation at 25°C and a 5V supply, unless otherwise noted. For further information, refer to note 1 below.
Characteristic
Minimum Typical
Maximum Units
Conditions
Supply Voltage, VDD
VDD rate of rise
3.0
5.0
5.5
V
see note 2
0.05
V/ms
VDD = 5V
VDD = 3V
Average Supply Current, IDD
0.60
0.35
2.4
2.4
mA
mA
Reset pin internal pullup resistance
see note 3
300
VSS
470
600
0.15 VDD
VDD
KW
V
Input low voltage
Input high voltage
Output low voltage
Output high voltage
Output Duty Cycle
0.85 VDD
V
0.6
V
Current (sink) = 8.7mA
Current (source) = 5.4mA
any output
VDD - 0.7
V
50
%
Notes:
1. This integrated circuit is produced with a Microchip Technology Inc.’s PIC12C5XX as the core embedded
microcontroller. For further device specifications, and possibly clarification of those given, please refer to the
appropriate Microchip documentation.
2. This spec must be met in order to ensure that a correct power on reset occurs. It is quite easily achieved
using most common types of supplies, but may be violated if one uses a slowly varying supply voltage, as
may be obtained through direct connection to solar cells, or some charge pump circuits.
3. The value of the pullup resistance is supply and temperature dependent.
Example Application
+5V
0.1µF
Operation of the ELM446 is straightforward,
requiring little explanation. Typically it is
connected in a circuit as shown at the right.
Optionally, one might replace one of the fixed
value capacitors with a variable one, in order to
be able to trim the oscillator frequency for
greater accuracy. As usual, it is also good
practice to place a bypass capacitor across the
power supply as well.
1
2
3
4
8
7
6
5
3.58MHz
50Hz Out
27pF
27pF
3 of 3
ELM446DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
ELM [ ELM ELECTRONICS ]
