182
Digital Electronics
TTL
CMOS
+5V
O/P
I/P
(a)
+15V
O/P
+5V
CMOS
1K
TTL
10K
(b)
I/P
I/P
+15V
CMOS
O/P
TTL
Buffer
(open collector)
+5V
10K
TTL
(c)
10K
Figure 5.63 TTL-to-CMOS interface.