View sn74act3631-15pq datasheet:

SN74ACT3631-15PQ (1/4) IL08 C-MOS 512 x 36 CLOCK FIRST-IN/FIRST-OUT MEMORY —TOP VIEW— 117 NC NC 83 GND NC GND 120 80 125 VDD (+4.5 to +5.5 V) 75 GND VDD (+4.5 to +5.5 V) 130 VDD (+4.5 to +5.5 V) 70 132 GND 1 GND 65 5 VDD (+4.5 to +5.5 V) NC GND 60 GND 10 GND VDD (+4.5 to +5.5 V) 55 15 VDD (+4.5 to +5.5 V) NC 17 NC NC 51 105 100 95 90 85 ) ) ) NC 116 NC 115 NC 84 GND GND GND ( ( ( V DD + 4.5 to + 5.5 V 110 V DD + 4.5 to + 5.5 V V DD + 4.5 to + 5.5 V ) ) ( ( GND GND V DD + 4.5 to + 5.5 V GND NC 18 NC 20 25 30 V DD + 4.5 to + 5.5 V 35 40 GND 45 50 NC SN74ACT3631-15PQ (2/4) (VDD = +4.5 to +5.5 V) PIN PIN PIN PIN I/O SIGNAL I/O SIGNAL I/O SIGNAL I/O SIGNAL NO.