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108243
MCS-48™
INPUT/OUTPUT
EXPANDER
•
-
40°C
to +
85°C
Operation
•
24-Pin DIP
•
Low Cost
•
Single
5V
Supply
•
Simple Interface
to
MCS-48™ Micro-
computers
•
High Output Drive
•
Four 4-Bit 1/0 Ports
•
Direct
Extension
of
Resident 8048 1/0
•
AND and OR Directly
to
Ports Ports
The
Intel!!>
8243 is an
input/output
expander desigrjed specifically
to
provide a
low
cost means
of
I/O
expansion
for
the
MCS-48'·
family
of
single
chip
microcomputers. Fabricated in 5 volts NMOS, the 8243 combines
low
cost, single supply
voltage and high drive current capability.
The 8243 consists of
four
4-bit bidirectional static
I/O
ports and one 4-bit
port
which serves
as
an interface
to
the MCS-48
microcomputers.
The 4-bit interface requires
that
only
4 I/O lines
of
the 8048 be used
for
I/O
expansion, and also allows
multi
pie 8243's
to
be added
to
the same bus.
The
1/0
ports
of the 8243 serve
as
a
direct
extension
of
the resident
1/0
facilities
of
the MCS-48 microcomputers and are
accessed by their
own
MOV, ANL, and ORL instructions.
PIN CONFIGURATION
BLOCK DIAGRAM
PORT 4
PSO
vee
P40
PS'
1'4'
P52
1'42
P53
1'43
PSO
PORT 5
cs
P6,
PROG
P62
PORT 2
P23
P63
P22
P73
P2,
P72
P20
P7'
PORT 6
GNO
P70
PORT
7
6-63
AFN-Q0861A-01