该封装的集成电路四周均有引脚,引脚之间距离很小,管脚很细,一般大规模或超大型集成电路都采用这种封装形式。具有性能良好,可靠性高,价格低廉等优势 同时用这种形式封装的集成电路必须采用SMT(表面组装技术)将封装的集成电路与主板焊接起来。采用SMT安装的芯片不必在主板上打孔,一般在主板表面上有设计好的相应管脚的焊点。将各脚对准相应的焊点,即可实现与主板的焊接。
1. 适合高频使用
2. 操作方便
3. 工艺成熟
4. 价格便宜
5. 带有缓冲垫,不易损坏
PIN | SIGNAL | DESCRIPTION |
1 | NC | - |
2 | A10 | Address input |
3 | A8 | Address input |
4 | A7 | Address input |
5 | A6 | Address input |
6 | A5 | Address input |
7 | A4 | Address input |
8 | A3 | Address input |
9 | A2 | Address input |
10 | A1 | Address input |
11 | A0 | Address input |
12 | NC | - |
13 | I/O(0) | Data Input/Output |
14 | I/O(1) | Data Input/Output |
15 | I/O(2) | Data Input/Output |
16 | Vss | Ground |
17 | I/O(3) | - |
18 | I/O(4) | Data Input/Output |
19 | I/O(5) | Data Input/Output |
20 | I/O(6) | Data Input/Output |
21 | I/O(7) | Data Input/Output |
22 | I/O(8) | Data Input/Output |
23 | CE | Chip Enable |
24 | A9 | Address input |
25 | OE | Output Enable |
26 | NC | - |
27 | Vcc | +3.3V |
28 | WE | Write Enable |
29 | A11 | Address input |
30 | CE | Chip Enable |
31 | A12 | Address input |
32 | A13 | Address input |
33 | OE | Output Enable |
34 | A14 | Address input |
35 | A15 | Address input |
36 | A16 | Address input |
37 | A17 | Address input |
38 | A18 | Address input |
39 | Vcc | +3.3v |
40 | Vss | Ground |
41 | A19 | Address input |
42 | CN | - |
43 | WE | Write Enable |
44 | A20 | Address input |