Intel MCS48 User Manual page 263

intel
8205
HIGH
SPEED
1
OUT OF
8
BINARY
DECODER
I/O Port or
Memory
Selector
Simple Expansion
—
Enable
Inputs
High
Speed
Schottky Bipolar
Technology
—
18ns Max. Delay
Directly
Compatible
with
TTL
Logic
Circuits
Low
Input
Load
Current
—
.25
mA
max.,
1/6 Standard
TTL
Input
Load
Minimum
Line Reflection
—
Low
Voltage
Diode
Input
Clamp
Outputs Sink
10
mA
min.
16-Pin Dual-ln-Line
Ceramic
or
Plastic
Package
The 8205
decoder can be used
for
expansion
of
systems
which
utilize
input
ports,
output
ports,
and
mem-
ory
components
with
active
low
chip select input.
When
the
8205
is
enabled,
one
of
its
eight
outputs goes
"low", thus
a single
row
of
a
memory
system
is
selected.
The
3 chip enable inputs
on
the
8205
allow easy
system expansion. For very
large
systems,
8205 decoders can be cascaded such
that
each decoder can
drive
eight
other decoders
for arbitrary
memory
expansions.
®
The
Intel
8205
is
packaged
in a
standard 16 pin dual-in-line
package; and
its
performance
is
specified over
the
temperature
range of
0°C
to
+75°C, ambient.
The
use of
Schottky
barrier
diode
clamped
transistors
to
obtain
fast
switching speeds
results
in
higher
performance
than equivalent
devices
made
with
a
gold
diffu-
sion process.
PIN
CONFIGURATION
LOGIC
SYMBOL
A
oC
1
16
^K
A,
CI
2 15
Z]0
A
2
CZ
3
14
ZDo,
E,LI
4
8205
13
Z]o
2
e
2
L_
5 12
_Jo
3
E
3
C=
6
11
Z]o
4
o
7
(Z
7
10 Z]05
grd|
8
9
Z]o
6
PIN
NAMES
A
A
2
ADDRESS
INPUTS
Ei
E
3
ENABLE
INPUTS
j
O
O^
DECODED OUTPUTS
ADDRESS ENABLE
OUTPUTS
A
A,
A
2
E, E
2
E
3
1
2 3 4 5 6
7
L
L L L L
H
L
H
H
H
H H H H
H
L
L
L
L
H
H
L
H
H
H H H H
L
H
l_
L L
H H H
L
H
H H H H
H H
L L L
H H H H
L
H H
H H
L L
H
L L
H H H H H
L
H H H
H
L
H
L L
H H H H H H
I
H
H
L
H H
L L
H
H H
H H
H H
I
H
H H
H
L L
H H H H H
H
H
H
L
XXX
L L L
H H H H H
H H H
XXX
H
L L
H H H H H H H
H
XXX
L
H
L
H H H H H H H H
XXX
H H
L
H H
H H
H H H
H
XXX
H
L
H H H H H
H
H
H H
XXX
L
H H
H
H H H H H H H
XXX
H H H H
H
H
H H H H H
INTEL
CORPORATION ASSUMES NO
RESPONSIBILITY
FOR
THE USE OF
ANV
CIRCUITRY OTHER THAN CIRCUITRY
EMBODIED
IN
AN
INTEL PRODUCT. NO OTHER
CIRCUIT
PATENT
LICENSES ARE IMPLIED
©
INTEL
CORPORATION, 1979
7-25