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| bcm5238ba3kfb资料 | |
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bcm5238ba3kfb |
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file size : 116 kb
manufacturer:broadcom description:timer clearing a negative edge or pulse at the tcl input longer than 150 ns will clear the timer and deactivate the reset outputs under normal running conditions (see fig. 3). tcl will however have no effect either when vdd < voff or during the initialization period before the deactivation of the reset pins. combined voltage and timer action in fig. 6 is a typical sequence of power-up, watchdog run, and power-down. during initialization the save pin deactivates one debounce delay time tdb after vin rises above vsh, or when the power line vdd rises above von, whichever happens last. the reset pins only deactivate one timeout period tto afterwards to free the watchdog timer and end the initialization. note that either vin falling below vrl threshold or vdd below von will cause an initialization upon recovery. following initialization, the watchdog timer will time out after time tto unless at least one tcl pulse clears it. on timeout the reset pins reactivate for a further tto period before deactivating again for another try. a tcl pulse will deactivate any timeout reset, and another tcl pulse must follow within a time tto to keep reset inactive. if no tcl pulses come at all, the reset pins go square-wave. power-down overrides all this however. a falling voltage on vin gives a warning save = 0 signal at vin = vsl before activating the reset pins as soon as vin drops below vrl. the h6061 has fixed thresholds and low hysteresis for monitoring regulated dc lines. additional protection is provided in case vdd supply falls over about 10% below von which thereupon activates all outputs at once. |
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| 1pcs | 100pcs | 1k | 10k | ||
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型 号：bcm5238ba3kfb 厂 家：broadcom 封 装：bga 批 号：0512 数 量：2300 说 明：特价出售，全新原装.部份无铅 |
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