Figure 2.9 I/O signals (2 o f 5)
Pin
Pin
I/O
Description DC Characteristics
Name Number
Driver or Receiver Re-
quirements o f each
Peripheral
BAO
c26
0
Buffered 20-bit Address Bus Receiver: l|_<-1.2m A
0
l(-l< 60uA
0
Range to 1MB Normal ou tput, active high Spec. Operation
0
Driver: (Only Tristate)
0
Tri-State possible w ith A B TR I/sig na l.
I |_>24mA
BA19
a17
0 l|-l>-10m A
IOW/
a4
0 I/O WRITE
Receiver: I L <-1.2m A
IO R /
c4
0 I/O READ _ ...
Processor control lines.
l|-l<60uA
active low.
Tri-state possible
Special Operation
ME MW/
a5 0
MEMORY W RITE Driver: l|_>24m A
M EM R / c5 0
MEMORY READ
(Only l(-)> -5m A
Tristate)
RESET/
a3 0 System Reset O utput, active low. Receiver: I (_<-0.4mA
Ih < 2 0 uA
2-1 2
To Next Page
Loading...