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The HD74HC688 compares bit for bit two 8-bit words and indicates whether or not they are equal. The P=Q output indicates equality when it is low. A single active low enable is provided to facilitate cascading of several packages and enable comparison of words greater than 8-bits. This device is useful in memory block decoding applications, where memory block.
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• High Speed Operation: tpd (P or Q to Output) = 17 ns typ (C L = 50 pF 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)
Function Table
Input Data P, Q P=Q P>Q P
HD74HC688 - Renesas
The HD74HC688 compares bit for bit two 8-bit words and indicates whether or not they are equal. The P=Q output indicates.
| No. | Partie # | Fabricant | Description | Fiche Technique |
|---|---|---|---|---|
| 1 | HD74HC680 |
Hitachi Semiconductor |
12-bit Address Comparator |
|
| 2 | HD74HC680 |
Renesas |
12-bit Address Comparator |
|
| 3 | HD74HC682 |
Hitachi Semiconductor |
8-bit Magnitude Comparator |
|
| 4 | HD74HC682 |
Renesas |
8-bit Magnitude Comparator |
|
| 5 | HD74HC684 |
Hitachi Semiconductor |
8-bit Magnitude Comparator |
|
| 6 | HD74HC684 |
Renesas |
8-bit Magnitude Comparator |
|
| 7 | HD74HC620 |
Hitachi Semiconductor |
Octal Bus Transceivers |
|
| 8 | HD74HC620 |
Renesas |
Octal Bus Transceivers |
|
| 9 | HD74HC623 |
Hitachi Semiconductor |
Octal Bus Transceivers |
|
| 10 | HD74HC623 |
Renesas |
Octal Bus Transceivers |
|
| 11 | HD74HC640 |
Hitachi Semiconductor |
Octal Bus Transceivers |
|
| 12 | HD74HC640 |
Renesas |
Octal Bus Transceivers |
|