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IDT74FCT646AL Datasheet(PDF) 1 Page - Integrated Device Technology |
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IDT74FCT646AL Datasheet(HTML) 1 Page - Integrated Device Technology |
1 / 8 page Integrated Device Technology, Inc. MILITARY AND COMMERCIAL TEMPERATURE RANGES MAY 1992 ©1992 Integrated Device Technology, Inc. 7.18 DSC-4626/2 ® The IDT logo is a registered trademark of Integrated Device Technology, Inc. FAST is a registered trademark of National Semiconductor Co. IDT54/74FCT646 IDT54/74FCT646A IDT54/74FCT646C 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 = 64mA (commercial) and 48mA (military) • CMOS power levels (1mW typical static) • TTL input and output level compatible • CMOS output level compatible • 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 compliant 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 real- time 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. FAST CMOS OCTAL TRANSCEIVER/REGISTER FUNCTIONAL BLOCK DIAGRAM 2536 drw 01 1D C 1 A REG A 1 1D C 1 B REG B1 TO 7 OTHER CHANNELS 1 OF 8 CHANNELS SAB CPBA CPAB SBA DIR G 1 |
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