Programmable Logic Devices
343
2
10
9
8
7
6
5
4
CLK
3
11
12
13
14
15
16
17
20
18
19
1
I 0
I 1
I 2
I 3
I 4
I 5
I 6
I 7
GND
V cc
B 7
Q 6
Q 5
Q 4
Q 3
Q 2
Q 1
B 0
OE
AND
OR
Array
Q
D Q
Q
D Q
Q
D Q
Q
D Q
Q
D Q
Q
D Q
(c)
Figure 9.35 (continued).
Figure 9.36 shows the basic architecture and pin connection diagram of GAL 22V10. The internal
architecture of the output logic macrocell (OLMC) shown as a block in Fig. 9.36 is given in Fig. 9.37.
9.12.2 CPLDs
Major CPLD manufacturers include Altera, Lattice Semiconductor Corporation, Advanced Micro
Devices, ICT, Cypress and Xilinx. A large variety of CPLD devices are available from these companies.
In the following paragraphs, some of the popular type numbers of CPLDs offered by some of these
companies are examined in terms of their characteristic features.
We will begin with CPLDs from Altera. Altera offers three families of CPLDs. These include MAX5000, MAX-7000 and MAX-9000. MAX-5000 uses an older technology and is used in applications