DESCRIPTION
OF ”B” SERIES CMOS DEVICES” BEY (Plastic Package) BF (Ceramic Frit Seal Package) BM1 (Micro Package) ORDER CODES : HCC40208BF HCF40208BEY HCF40208BM1 PIN CONNECTIONS DESCRIPTION
When the ENABLE input is low, the corresponding output bus is switched, independently of the clock to a high-impedance state. The high-impedance third state provides the outputs with the capability of being connected to the bus lines in a bus-organized system without the need for interface or pull-up components. When the WRITE ENABLE input is high, all data input lines are latched on the positive transition of the CLOCKand the data is entered into the wordselected bythewrite address lines. When WRITE ENABLE is low, the CLOCK is inhibited and no new data is entered. In either case, the contents of any word may be accessed via the read address lines independent of the state of the CLOCK input. June 1989 1/13 HCC/HCF40208B FUNCTIONAL DIAGRAM ABSOLUTE MAXIMUM RATINGS
Symbol V DD* Vi II Pt ot Parameter S...
STMicroelectronics
