Elm Electronics – Circuits for the Hobbyist

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ELM440

Electrical Characteristics

Absolute Maximum Ratings

Storage Temperature....................... -65°C to +150°C

Ambient Temperature with

Power Applied....................................-40°C to +85°C

Voltage on any other pin with

Note:

Stresses beyond those listed here will likely damage

the device. These values are given as a design

guideline only. The ability to operate to these levels

is neither inferred nor recommended.

3 of 4

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

Conditions

Units

3.0

5.0

5.5

V

0.05

V/ms

0.60

2.4

mA

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.

4. This specification represents current flowing through the protection diodes when applying large voltages to

the sync input (pin 5) through a current limiting resistance. Currents quoted are the maximum continuous.

Input low voltage

V

Input high voltage

V

Output low voltage

0.6

V

Output high voltage

V

Current (sink) = 8.7mA

Current (source) = 5.4mA

see note 2

ELM440DSB

Output Duty Cycle

%

50

any output

0.35

2.4

mA

see note 3

Reset pin internal pullup resistance

K

Ω

470

300

600

Input current

+ 0.5

mA

- 0.5

sync input only, see note 4