View z8523010vsc datasheet:

Z8523010VSC (1/3) IL00D C-MOS SERIAL COMMUNICATION CONTROLLER —TOP VIEW— 6 5 4 3 2 1 44 43 42 41 40 7 39 8 38 9 37 10 VDD NC 36 11 GND 35 12 34 13 33 14 32 15 31 16 30 17 NC 29 18 19 20 21 22 23 24 25 26 27 28 PIN PIN PIN PIN SIGNAL I/O SIGNAL I/O SIGNAL I/O I/O SIGNAL NO. NO. NO. NO. 1 I/O D0 12 I/O SYNCA 23 I PCLK 34 O W/REQB 2 I/O D1 13 I RTXCA 24 I DCDB 35 — GND 3 I/O D3 14 I RXDA 25 I CTSB 36 — NC 4 I/O D5 15 I/O TRXCA 26 O RTSB 37 I D/C 5 I/O D7 16 O TXDA 27 O DTR/REQB 38 I CE 6 O INT 17 — NC 28 — NC 39 I A/B 7 O IEO 18 — NC 29 O TXDB 40 I WR 8 I IEI 19 O DTR/REQA 30 I/O TRXCB 41 I RD 9 I INTACK 20 O RTSA 31 I RXDB 42 I/O D6 10 — VDD 21 I CTSA 32 I RTXCB 43 I/O D4 11 O W/REQA 22 I DCDA 33 I/O SYNCB 44 I/O D2 NC NC Z8523010VSC (2/3)