Programmable Logic Devices
341
Table 9.5 Input/output configuration of the 16XX family.
Device number
Dedicated
inputs
Combinational
outputs
Registered
outputs
16L8
10
8 (6 I/O)
0
16R8
8
0
8
16R6
8
2 I/O
6
16R4
8
4 I/O
4
2
10
9
8
7
6
5
4
I 0
3
11
12
13
14
15
16
17
20
18
19
1
I 1
I 2
I 3
I 4
I 5
I 6
I 7
I 8
GND
V cc
O 7
B 6
B 5
B 4
B 3
B 2
B 1
O 0
I 9
AND
OR
Array
(a)
Figure 9.35 Basic architecture/pin connections of the 16XX-series PAL devices.