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HD74HC640, HD74HC643 Octal Bus Transceivers (with 3-state outputs) REJ03D0637-0200 (Previous ADE-205-517) Rev.2.00 Mar 30, 2006 Description Each device has an active enable G and a direction control input, DIR. When DIR is high, data flows from the A inputs to the B outputs. When DIR is low, data
HD74HC620, HD74HC623 Octal Bus Transceivers (with inverted 3-state outputs) Octal Bus Transceivers (with 3-state outputs) REJ03D0636-0200 (Previous ADE-205-516) Rev.2.00 Mar 30, 2006 Description This octal bus transceiver is designed for asynchronous two-way communication between data buses. The con
HD74HC680 12-bit Address Comparator Description The HD74HC680 address comparator simplifies addressing of memory boards and/or other peripheral devices. The four P inputs are normally hard wired with a preprogrammed address. An internal decoder determines what input information applied to the 12 A
HD74HC679 12-bit Address Comparator Description The HD74HC679 address comparator simplifies addressing of memory boards and/or other peripheral devices. The four P inputs are normally hard wired with a preprogrammed address. An internal decoder determines what input information applied to the 12 A
HD74HC678 16-bit Address Comparator Description The HD74HC678 address comparator simplifies addressing of memory boards and/or other peripheral devices. The four P inputs are normally hard wired with a preprogrammed address. An internal decoder determines what input information applied to the 16 A
HD74HC668/HD74HC669 Synchronous UP/Down Decade Counter Synchronous Up/Down 4-bit binary Counter Description This synchronous presettable decade counter features an internal carry look-ahead for cascading in highspeed counting applications. Synchronous operation is provided by having all flip-flops
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