HD74ACT298 Datasheet | Hitachi Semiconductor

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 mon 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 m A - HD74ACT298 has TTL-patible 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 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 m A Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C VIN = VCC - 2.1 V, VCC = 5.5 V, Ta = Worst case AC Characteristics: HD74AC298 Ta = +25°C CL = 50 p F Item Maximum count frequency Propagation delay CP to Q Propagation delay CP to Q Note: t PHL t PLH Symbol f max VCC (V)- 1 3.3 5.0 3.3 5.0 3.3 5.0 Min 90 110 1.0 1.0 1.0 1.0 Typ - - 7.0 5.0 7.5 5.5 Max - - 10.0 7.5 10.0 7.5 Ta = - 40°C to +85°C CL = 50 p F Min 70 100 1.0 1.0 1.0 1.0 Max - - 11.5 8.5 11.5 8.5 ns Unit MHz 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V HD74AC298/HD74ACT298 AC...