74670

The 74670 is a tri-state 4x4 register file 74-series logic IC, often used to reduce chip count when having many registers in the implementaion.

Pinout

74670 Pinout  

                         .--__--. 
                     D1 -|01  16|- VCC 
                     D2 -|02  15|- D0 
                     D3 -|03  14|- Write A0 
                Read A1 -|04  13|- Write A1 
                Read A0 -|05  12|- /WE 
                     Q3 -|06  11|- /OE 
                     Q2 -|07  10|- Q0 
                    GND -|08  09|- Q1 
                         '------'

Signal descriptions

D0-D3 : data input lines
Q0-Q3 : data output lines
Write A0-A1 : write register selection
Read A0-A1 : read register selection
/WE : copy the current content of D0-D3 to the selected register when this pin is low
/OE : output the current content of the selected register when this pin is low, otherwise high-impedance
VCC, GND : power supply

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