74hct series logic texas instruments sn74hct573n this texas instruments 74hct573n octal transparent d type latch ic is available in a dil 20 package a part of the 74hct range it features tristate outputs designed specifically for driving highly capacitive or relatively low impedance loads the hct573 devices are particularly suitable for implementing buffer registers io ports bidirectional bus drivers and working registers texas instruments sn74hct573n octal d type latch 3 state outpu