HD74HC564

HD74HC564/HD74HC574 Octal D-type Flip-Flops (with 3-state outputs) Description These devices are positive edge triggered flip-flops. The difference between HD74HC564 and HD74HC574 is only that the former has inverting outputs and the latter has noninvertering outputs. Data at the D inputs, meeting the set-up and hold time requirements, are transferred to the Q or Q outputs on positive going transitions of the clock (CK) input. when a high logic level is applied to the output cotrol (OC) input, all outputs go to a high impedance state, regardless of what signals are present at the other inputs and the state of the storage elements. Features High Speed Operation: tpd (Clock to Output) = 13 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) Function Table Outputs Output Control L L L H Q0 : Q0 : L X Clock Data H L X X HD74HC564 L H Q0 Z HD74HD574 H L Q0 Z level of Q before the indicated Steady-sate input conditions were established. complement of Q 0 or level of Q before the indicated Steady-state input Conditions were established. HD74HC564/HD74HC574 Pin Arrangement HD74HC564 Output 1 Control 1D 2 2D 3 3D 4 4D 5 5D 6 6D 7 7D 8 8D 9 GND 10 OE D Q OE D Q OE D Q OE D Q OE D Q OE D Q OE D Q OE D Q 20 VCC 19 1Q 18 2Q 17 3Q 16 4Q 15 5Q 14 6Q 13 7Q 12 8Q 11 Clock (Top view) 2 HD74HC564/HD74HC574 HD74HC574 Output 1 Cont...