The TS823/824/825 family allows the user to cus tomize the C PU monitoring func tion without any external components . The user has a large choice of reset voltage thresholds and output driver configurations, all of w hich ar e present ant the fac tory. Each wafer is trimmed to the customer 's specifications . These circuits will ignore fast negative going tr ansients on Vdd. The state of the reset output is guaranteed to be correct dow n to 1V. After Vdd crosses above a fac tor y present threshold, the TS823/824/825 assert a reset signal. After a predeter mined time ( the "reset" interval) the res et is deasserted. If Vdd ever dr ops below the threshold voltage a reset is asserted immediately . In addition to a supply monitoring function the TS823/824/825 also monitor transitions at the watchdog (WD I) input. If a logic transition does not occur at the WD I pin within a certain time inter val (the "watchdog" interval) then a reset is asserted. The reset deasserts after the reset interval, as explained earlier. The TS823/824/825 can both assert a reset manually by pulling the MR input to ground, and the micro-power quiescent current make this family a natural for portable battery powered equipment.