ASM1834, ASM1834A, ASM1834D

http://onsemi.com

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Figure 5. Pushbutton Reset

Figure 6. Timing Diagram: Pushbutton Reset

Reset Output Signal

Reset output signals are valid as long as either voltage at

has push−pull outputs that can remain valid below a 1.2 V

input level. To sink current below 1.2 V, a resistor should be

connected from the RESET output to ground. This resistor

guarantees a valid reset signal down to 0 V. A 100 k

W value

is suggested.

The AS1834A open drain reset outputs require pull−up

resistors and must be low enough in value to pull the output

into a HIGH state. Resistor value is not critical in most

applications and a value of 10 k

W is suggested. (See

Figures 7 and 8.)

The ASM1834A open drain reset outputs can be

connected to the same potential through a single pull−up

resistor. In this configuration a failure on either supply will

generate an active LOW reset. If the inputs are pulled−up to

different voltages, the reset outputs (pin 2 and pin 7) cannot

be connected to form a wired “AND” (see Figure 9).

Figure 7. ASM1834 RESET Valid to 0 V