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ELM382

50 Hz long interval counter.

Elm Electronics 

ELM382

Pin Descriptions

VDD (pin 1)

This pin is the positive supply pin, and should

always be the most positive point in the circuit.

Internal circuitry connected to this pin is used to

provide power on reset of the microprocessor, so

an external reset signal is normally not required.

Refer to the Electrical Characteristics section for

further information.

D1 (pin 2) and D0 (pin 3)

The logic levels on these pins control the divider

ratio, as shown in Table 1. Their levels are stored

in an internal latch on the low to high transistion of

the Pulse output, and are used for that entire

timing period.

reset (pin 4)

An active low input that forces both outputs low,

and causes all counter stages to initialize. If

unused, it can be left open circuited (due to the

internal resistor) or preferrably tied to VDD. Refer to

the minimum timing requirements in the Electrical

Characteristics section.

present. The Schmitt trigger amplifier on the

input simplifies the coupling to slowly varying

signals, while the inherent protection diodes

(shown in the block diagram) allow signals with

peak levels beyond the supply limits to be

connected through a current limiting resistor.

Pulse (pin 6)

This output pin is normally at a low level, but is

momentarily driven high at the beginning of

every timing period. The duration of the pulse is

fixed at 50 cycles of the clock input (nominally 1

second with a 50Hz input). This output will not

assume a high level following a circuit reset until

there has been a valid clock transition.

Out (pin 7)

This is the main timing chain output. It has a

fixed 50% duty cycle, and begins each timing

cycle at a logic low level. Halfway through each

cycle, Out will assume a logic high level and will

remain high until the end of the timing period.

Clock (pin 5)

The counter stages advance on the falling edge

(VDD to VSS) of this input, if there is no reset signal

VSS (pin 8)

Circuit common is connected to this pin. This is

the most negative point in the circuit.

Ordering Information

These integrated circuits are available in either the 300 mil plastic DIP format, or in the 200 mil SOIC surface

mount type of package. To order, add the appropriate suffix to the part number:

300 mil Plastic DIP............................... ELM382P

200 mil SOIC..................................... ELM382SM

All rights reserved. Copyright ©2000 Elm Electronics.

Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be

given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information

described in this document. Elm Electronics will not be responsible for any patent infringements arising from the use of these

products or information, and does not authorize or warrant the use of any Elm Electronics product in life support devices and/or

systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve

reliability, function, or design.

ELM382DSA

Elm Electronics – Circuits for the Hobbyist

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