2 Pin Descriptions

The descriptions of the pins are listed in Table 2-1.

Table 2-1. Pin Function Table
Name 28-Lead PDIP 32-Lead PLCC 28-Lead SOIC Function
DC — 1 — Don’t Connect
NC 1 2 1 No Connect
A12 2 3 2 Address
A7 3 4 3 Address
A6 4 5 4 Address
A5 5 6 5 Address
A4 6 7 6 Address
A3 7 8 7 Address
A2 8 9 8 Address
A1 9 10 9 Address
A0 10 11 10 Address
NC — 12 — No Connect
I/O0 11 13 11 Data Input/Output
I/O1 12 14 12 Data Input/Output
I/O2 13 15 13 Data Input/Output
GND 14 16 14 Ground
DC — 17 — Don’t Connect
I/O3 15 18 15 Data Input/Output
I/O4 16 19 16 Data Input/Output
I/O5 17 20 17 Data Input/Output
I/O6 18 21 18 Data Input/Output
I/O7 19 22 19 Data Input/Output
CE 20 23 20 Chip Enable
A10 21 24 21 Address
OE 22 25 22 Output Enable
NC — 26 — No Connect
A11 23 27 23 Address
A9 24 28 24 Address
A8 25 29 25 Address
NC 26 30 26 No Connect
WE 27 31 27 Write Enable
VCC 28 32 28 Device Power Supply