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HD74HC678 Datasheet

Part Number HD74HC678
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description 16-bit Address Comparator
Datasheet HD74HC678 DatasheetHD74HC678 Datasheet (PDF)

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 inputs must be low or high to cause a low state at the output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determines that inputs A1 through A7 must be low and.

  HD74HC678   HD74HC678






Part Number HD74HC679
Manufacturers Renesas
Logo Renesas
Description 12-bit Address Comparator
Datasheet HD74HC678 DatasheetHD74HC679 Datasheet (PDF)

HD74HC679 12-bit Address Comparator REJ03D0640-0200 (Previous ADE-205-526) Rev.2.00 Mar 30, 2006 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 inputs must be low or high to cause a low state at the output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the .

  HD74HC678   HD74HC678







Part Number HD74HC679
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description 12-bit Address Comparator
Datasheet HD74HC678 DatasheetHD74HC679 Datasheet (PDF)

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 inputs must be low or high to cause a low state at the output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determines that inputs A1 through A7 must be low and.

  HD74HC678   HD74HC678







Part Number HD74HC677
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description 16-bit Address Comparator
Datasheet HD74HC678 DatasheetHD74HC677 Datasheet (PDF)

HD74HC677 16-bit Address Comparator Description The HD74HC677 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 infomation applied to the 16 A inputs must be low or high to cause a low state at the output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determines that inputs A1 through A7 must be low and .

  HD74HC678   HD74HC678







Part Number HD74HC674
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description 16-bit Shift Register
Datasheet HD74HC678 DatasheetHD74HC674 Datasheet (PDF)

HD74HC674 16-bit Shift Register Description The HD74HC674 is a 16-bit parallel-in, serial-out shift register. A three-state input/output (data I/O) port provides access for entering serial data or reading the shift-register word in a recirculating loop. The device has four basic modes of operation: 1. 2. 3. 4. Hold (do nothing) Write (serially via input/output) Read (serially) Load (parallel via data inputs) Low-to-high-level changes at the chip select input should be made only when the clock .

  HD74HC678   HD74HC678







16-bit Address Comparator

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 inputs must be low or high to cause a low state at the output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determines that inputs A1 through A7 must be low and that inputs A8 through A16 must be high to cause the output to go low. Equality of the address applied at the A inputs to the preprogrammed address is indicated by the output being low. The HD74HC678 features a transparent latch and a latch enabled input (C). When C is high, the device is in the transparent mode. When C is low, the previous logic state of Y is latched. Features • • • • • High Speed Operation High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) HD74HC678 Function Table Inputs C H H H H H H H H H H H H H H H H H L P3 P2 P1 P0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 Output Y L L L L L L L L H H H H H H H H L L L L H H H H L L L L H H H H L L H H L L H H L L H H L L H H L H L H L H L H L H L H L H L H H L L L L L L L L L L L L L L L H H L L L L L L L L L L L L L L H H H L L L L L L L L L L L L L H H H H L L L L L L L L L L L L H H .


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