TS824CX5H datasheet(4/6 Pages) TSC

Nome de Peças	TS824CX5H

Descrição Electrónicos	Microprocessor Supervisory Circuit with Watchdog Timer & Manual Reset

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Fabricante Electrônico	TSC [Taiwan Semiconductor Company, Ltd]

Página de início	http://www.taiwansemi.com

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TS823/824/825

4-6

2003/12 rev. A

Detail Description (continued)

Watchdog Input Current

The watchdog input pin (WDI) typically sources/sinks

8uA when driven high or low. So from a power

dissipation point of view the duty cycle of the waveform

at WDI is unimportant. When the WDI pin is floating or

tri-stated the power supply current fall to less than 3uA.

Glitch Rejection

The TS823/824/825 family will reject negative going

transients on the Vdd line to some extent. The smaller

the duration of the transient the larger its amplitude may

be without triggering a reset. The “Glitch Rejection”

chart in the graphs section of this datasheet shows the

relation between glitch amplitude and allowable glitch

duration to avoid unintended resets.

Accurate Output State at Low Vdd

With Vdd voltage on the order of the MOS transistor

threshold (<1V) the outputs of the TS823/824/825 may

become undefined. For parts with active low output

RESET a resistor placed between RESET and Gnd on

the order of 100KΩ will ensure that the RESET output

stays low when Vdd is lower than the threshold voltage

of the part. In a like manner a resistor on the order of

100KΩ when placed between (RESET) and Vdd will

ensure parts with active high output (RESET) will remain

high when Vdd is lower than the threshold voltage of the

parts.

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