1 1DIR Direction Control for 8-Bit Section 1
2 1B1 B-Port Data I/O - Bit 1 (Section 1)
3 1B2 B-Port Data I/O - Bit 2 (Section 1)
4 GND Ground
5 1B3 B-Port Data I/O - Bit 3 (Section 1)
6 1B4 B-Port Data I/O - Bit 4 (Section 1)
7 VCCB B-Port Supply Voltage (1.65V to 5.5V)
8 1B5 B-Port Data I/O - Bit 5 (Section 1)
9 1B6 B-Port Data I/O - Bit 6 (Section 1)
10 GND Ground
11 1B7 B-Port Data I/O - Bit 7 (Section 1)
12 1B8 B-Port Data I/O - Bit 8 (Section 1)
13 2B1 B-Port Data I/O - Bit 1 (Section 2)
14 2B2 B-Port Data I/O - Bit 2 (Section 2)
15 GND Ground
16 2B3 B-Port Data I/O - Bit 3 (Section 2)
17 2B4 B-Port Data I/O - Bit 4 (Section 2)
18 VCCB B-Port Supply Voltage (1.65V to 5.5V)
19 2B5 B-Port Data I/O - Bit 5 (Section 2)
20 2B6 B-Port Data I/O - Bit 6 (Section 2)
21 GND Ground
22 2B7 B-Port Data I/O - Bit 7 (Section 2)
23 2B8 B-Port Data I/O - Bit 8 (Section 2)
24 2DIR Direction Control for 8-Bit Section 2
25 1OE Output Enable for 8-Bit Section 1 (Active LOW)
26 1A1 A-Port Data I/O - Bit 1 (Section 1)
27 1A2 A-Port Data I/O - Bit 2 (Section 1)
28 GND Ground
29 1A3 A-Port Data I/O - Bit 3 (Section 1)
30 1A4 A-Port Data I/O - Bit 4 (Section 1)
31 VCCA A-Port Supply Voltage (1.65V to 5.5V)
32 1A5 A-Port Data I/O - Bit 5 (Section 1)
33 1A6 A-Port Data I/O - Bit 6 (Section 1)
34 GND Ground
35 1A7 A-Port Data I/O - Bit 7 (Section 1)
36 1A8 A-Port Data I/O - Bit 8 (Section 1)
37 2A1 A-Port Data I/O - Bit 1 (Section 2)
38 2A2 A-Port Data I/O - Bit 2 (Section 2)
39 GND Ground
40 2A3 A-Port Data I/O - Bit 3 (Section 2)
41 2A4 A-Port Data I/O - Bit 4 (Section 2)
42 VCCA A-Port Supply Voltage (1.65V to 5.5V)
43 2A5 A-Port Data I/O - Bit 5 (Section 2)
44 2A6 A-Port Data I/O - Bit 6 (Section 2)
45 GND Ground
46 2A7 A-Port Data I/O - Bit 7 (Section 2)
47 2A8 A-Port Data I/O - Bit 8 (Section 2)
48 2OE Output Enable for 8-Bit Section 2 (Active LOW)