#74LS170

Description: 4 x 4 Register Files Open Collector

Datasheet: http://www.ti.com/lit/gpn/sn74LS170

Pinout:

    +-----------+
 D2 |[ 1]   [16]| VCC
 D3 |[ 2]   [15]| D1
 D4 |[ 3]   [14]| WA
 RB |[ 4]   [13]| WB
 RA |[ 5]   [12]| ~{EW}
 Q4 |[ 6]   [11]| ~{ER}
 Q3 |[ 7]   [10]| Q1
GND |[ 8]    [9]| Q2
    +-----------+