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TPS3823-33DBVR的tt(out)时间

Other Parts Discussed in Thread: TPS3823, UCC2946

最近使用到了TPS3823-33DBVR芯片,可是发现芯片的tt(out)时间各个芯片不统一,有1.8s的 还有1.2s的,因为我的芯片开机到初始化完毕输出喂狗信号大约要1.5s;所以1.2s的就不能用;datasheet中的TYP是1.6s(范围:0.9-2.5s);这种芯片不统一情况属于正常的么?有没有ttout时间更长的芯片?