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Schottky Bipolar
8205
HIGH SPEED 1 OUT OF 8 BINARY DECODER
• 110 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-In-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
"Iow",
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
O°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
o
16
V-c
c
Ao
00
A
1
2
15
°0
A,
0,
A
2
3
14
0
1
A2
02
E
1
4
13
°2
03
8205
8205
E
2
5
12
°3
04
E
3
6
11
0
4
E,
Os
0
7
7
10
°5
E2
06
GRD
8 9
°6
E3
07
PIN NAMES
AO-A2
ADDRESS
INPUTS
E,-
E3
ENABLE
INPUTS
°0.°7
DECODED
OUTPUTS
ADDRESS
ENABLE
OUTPUTS
A
o
A,
A
2
E,
E
2
E3
0
,
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
L
H
H
l H
H
L L
H H
H
H H
H
H
L
H
H H
H
L L
H H
H H H
H
H H
L
X X
X
L L
L
H
H H
H
...
H
H
H
X
X
X
H
L
L
H
H H
H
H
H
H
H
X
X
X
L H
L
H
H H
H
H
H H
H
X
X
X
H
H
L H
H H H
H
H H
H
X
X
X
H
L
H H
H H
H
H
H
H
H
X X
X L H
H H
H
H H H
H
H
H
X
X
X
H
H
H
H
H
H
H
H
H H
H,
5-147