Datasheet

Chip Okay (CHOK) Output
SN65HVS880
www.ti.com ............................................................................................................................................... SLAS592C – MARCH 2008 – REVISED NOVEMBER 2008
The CHOK output is the Boolean AND-function of the two, active-low fault conditions: temperature failure and
supply failure. As such CHOK is a device health indicator, assuming logic high in the absence of any fault
condition. If either one of the two or both fault conditions occur, CHOK becomes logic low.
A special condition occurs, however, when the chip temperature exceeds the second temperature trip point due
to an output short. Then the CHOK output buffer becomes tri-state, thus separating the buffer from the external
circuitry. An internal 100 k Ω pulldown resistor, connecting the CHOK-pin to ground, is used as a “ cooling down ”
resistor, which continues to provide a logic low level to the external circuitry.
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