View sn74act2235-20pm datasheet:

SN74ACT2235-20PM (1/3) IL22 ********** C-MOS 1024 X 9-BIT EACH FIFO MEMORY —TOP VIEW— 49 NC 32 50 31 VDD (+5V) 51 30 52 29 53 GND NC 28 54 GND 27 55 26 56 25 57 NC 24 58 23 59 GND 22 60 GND 21 61 20 62 19 VDD (+5V) 63 18 64 NC 17 PIN PIN PIN PIN PIN I/O SIGNAL I/O SIGNAL I/O SIGNAL I/O SIGNAL I/O SIGNAL No. No. No. No. No. 1 — VDD 14 — GND 27 O EMPTYA I/O B6 53 — GND 40 2 I/O A3 15 O AF/AEA 28 — NC 41 I/O B5 54 — GND 3 I/O A4 16 O HFA 29 I UNCKA — VDD 55 I GAB 42 4 — VDD 17 — NC 30 O FULLB — GND 56 I SAB 43 5 — GND 18 I LDCKA 31 I LDCKB — GND 57 I SBA 44 6 — GND 19 O FULLA 32 — NC 45 I/O B4 58 I GBA 7 I/O A5 20 I UNCKB 33 O HFB 46 I/O B3 59 — GND 8 I/O A6 21 O EMPTYB 34 O AF/AEB — VDD 60 — GND 4