IDT54FCT646 Datasheet | Integrated Device

® FAST CMOS OCTAL TRANSCEIVER/REGISTER IDT54/74FCT646 IDT54/74FCT646A IDT54/74FCT646C Integrated Device Technology, Inc. Features : - - - - - - - - - - IDT54/74FCT646 equivalent to FAST™ speed; IDT54/74FCT646A 30% faster than FAST IDT54/74FCT646C 40% faster than FAST Independent registers for A and B buses Multiplexed real-time and stored data IOL = 64m A (mercial) and 48m A (military) CMOS power levels (1m W typical static) TTL input and output level patible CMOS output level patible Available in 24-pin (300 mil) CERDIP, plastic DIP, SOIC, CERPACK and 28-pin LCC - Product available in Radiation Tolerant and Radiation Enhanced Versions - Military product pliant to MIL-STD-883, Class B DESCRIPTION: The IDT54/74FCT646/A/C consists of a bus transceiver with 3-state D-type flip-flops and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. The IDT54/74FCT646/A/C utilizes the enable control (G) and direction (DIR) pins to control the transceiver functions. SAB and SBA control pins are provided to select either real time or stored data transfer. The circuitry used for select control will eliminate the typical decoding glitch that occurs in a multiplexer during the transition between stored and realtime data. A LOW input level selects real-time data and a HIGH selects stored data. Data on the A or B data bus or both can be stored in the internal D flip flops by LOW-to-HIGH transitions at the appropriate clock pins (CPAB or CPBA) regardless of the select or enable control pins. FUNCTIONAL BLOCK DIAGRAM DIR CPBA SBA CPAB SAB 1 OF 8 CHANNELS B REG 1D C1 A1 A REG 1D C1 B1 TO 7 OTHER CHANNELS 2536 drw 01 The IDT logo is a registered trademark of Integrated Device Technology, Inc. FAST is a registered trademark of National Semiconductor Co. MILITARY AND MERCIAL TEMPERATURE RANGES ©1992 Integrated Device Technology, Inc. MAY 1992 DSC-4626/2 IDT54/74FCT646/A/C...