CD74HC238 CD74HC251 CD74HC253 CD74HC297 CD74HC257 CD74HC237 CD74HC20 CD74HC21 CD74HC221 CD74HC240 CD74HC241 CD74HC243 CD74HC244 CD74HC245 CD74HC259 CD74HC27 CD74HC273 CD74HC280 CD74HC283 CD74HC299