HD74HC323

HD74HC323 8-bit Universal Shift/Storage Register (with 3-state Outputs) Description This eight-bit universal register features multiplexed I/O ports to achieve full eight bit data handling in a single 20-pin package. HD74HC323 applications are as stacked or push-down registers, buffer storage, and accumulator registers. Two function-select inputs and two output control inputs can be used to choose the modes of operation listed in the function table. Synchronous parallel loading is accomplished by taking both function-select lines S0 and S1 high. This places the three-state outputs in a high-impedance state, which permits data that is applied on the I/O ports to be clocked into the register. Reading out of this register can be accomplished while the outputs are enabled in any mode. The clear function is synchronous, and a low level at the clear input clears the register on the next low-to-high transition of the clock. Features High Speed Operation: tpd (Clock to Q) = 20 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) HD74HC323 Function Table Inputs Function Select Mode Clear Clear L L Hold H H Shift Right Shift Left Load H H H H H S1 X L L X L L H H H S0 L X L X H H L L H Output Control G1† G2† L L L L L L L L X L L L L L L L L X X L Serial Inputs/Outputs Outputs QH’ L L QH0 QH0 QGn QGn H L h Clock SL SR A/QA B/QB ...