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)R...
IDT74FCT646ADB: 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 buse...
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Symbol | Rating | Commercial | Military | Unit |
VTERM(2) | Terminal Voltage with Respectto GND | 0.5 to+7.0 | 0.5 to+7.0 | V |
VTERM(3) | Terminal Voltage with Respect to GND | 0.5 to VCC | 0.5 to VCC | V |
TA | Operating Temperature | 0 to +70 | 55 to +125 | |
TBIAS | Temperature Under Bias | 55 to +125 | 65 to +135 | |
TSTG | StorageTemperature | 55 to +125 | 65 to +150 | |
PT | Power Dissipation | 0. 5 | 0. 5 | W |
IOUT | DC Output Current | 120 | 120 | mA |
The IDT74FCT646ADB 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 of the IDT74FCT646ADB 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.