SN54LS55 Overview
Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25°C) Limits Symbol tPLH tPHL Parameter Turn-Off Delay, Input to Output Turn-On Delay, Input to Output Min Typ 12 12.5 Max 20 20 Unit ns ns Test Conditions VCC = 5.0 V CL = 15 pF FAST AND LS TTL DATA 5-2.