74688

The 74688 is an 8-bit identity comparator 74-series logic IC. This IC is useful for decoding one specific and fine range of address.

Pinout

74688 Pinout  

                         .--__--. 
                    /CE -|01  20|- VCC 
                     A0 -|02  19|- /A=B 
                     B0 -|03  18|- B7 
                     A1 -|04  17|- A7 
                     B1 -|05  16|- B6 
                     A2 -|06  15|- A6 
                     B2 -|07  14|- B5 
                     A3 -|08  13|- A5 
                     B3 -|09  12|- B4 
                    GND -|10  11|- A4 
                         '------'

Signal descriptions

A0-A7 : 8-bit content A
B0-B7 : 8-bit content B
/A=B : low when the 8-bit contents of A and B are identical
/CE : /A=B pin is forced to output high when this pin is 1
VCC, GND : power supply

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