HD74ACT298

HD74AC298/HD74ACT298 Quad 2-Input Multiplexer with Storage Description This device is a high-speed multiplexer with storage. It selects four bits of data from two sources (Ports) under the control of a common Select input (S). The selected data is transferred to the 4-bit output register synchronous with the HIGH-to-LOW transition of the Clock input ( CP ). The 4-bit register is fully edge triggered. The Data inputs (I0 and I1) and Select input (S) must be stable only one setup time prior to the HIGH-to-LOW transition of the clock for predictable operation. Features Outputs Source/Sink 24 mA HD74ACT298 has TTL-Compatible Inputs Pin Arrangement I1b 1 I1a 2 I0a 3 I0b 4 I1c 5 I1d 6 I0d 7 GND 8 (Top view) 16 VCC 15 Qa 14 Qb 13 Qc 12 Qd 11 CP 10 S 9 I0c HD74AC298/HD74ACT298 Logic Symbol I0a I1a I0b I1b I0c I1c I0d I1d S CP Qa Qb Qc Qd Pin Names I1a – I1d I0a – I0d S CP Qa – Qd Source 1 Data Inputs Source 0 Data Inputs Select Input Clock Pulse Input (Active Falling Edge) Outputs Function Table Inputs S L H X H Cp Outputs Qa a1 a2 QA0 Qb b1 b2 QB0 Qc c1 c2 QC0 Qd d1 d2 QD0 2 HD74AC298/HD74ACT298 Logic Diagram I1a S I0a I1b I0b I1c I0c I1d I0d CP R CP S Qa R CP S Qb R CP S Qc R CP S Qd Qa Qb Qc Qd DC Characteristics (unless otherwise specified) Item Maximum quiescent supply current Maximum quiescent supply current Maximum ICC/input (HD74ACT298) Symbol I CC I CC I CCT Max 80 8.0 1.5 Unit µA µA mA Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VC...