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Schottky Bipolar 8212
EIGHT-BIT INPUT/OUTPUT
PORT
• Fully Parallel 8-Bit Data
Register and Buffer
• Service Request Flip-Flop
for
Interrupt Generation
• Low Input Load Current -
.25
mA
Max.
• Three State Outputs
• Outputs
Sink
1.5
mA
• 3.65V Output
High
Voltage
for
Direct
Interface
to
8080
CPU
or
8008 CPU
• Asynchronous Register
Clear
• Replaces Buffers, Latches
and
Multiplexers
in
Micro-
computer
Systems
• Reduces System Package
Count
The 8212
input/output
port
consists
of
an 8-bit latch with
3-state
output
buffers along with control and device selection
logic. Also included
is
a service request flip-flop for
the
generation and control
of
interrupts
to
the
microprocessor.
The device
is
multimode
in
nature.
It
can be used
to
implement latches, gated buffers
or
multiplexers. Thus,
all
of
the
princi-
pal peripheral and
input/output
functions
of
a microcomputer system can be implemented with this device.
PIN CONFIGURATI"ON
OS1
vee
MO
INT
01,
Dl
a
DO,
OOa
01
2
01
7
0°2
0°7
01
3
01
6
00
3
0°6
01
4
015
0°4
0°5
STB
CLR
GND
DS
2
PIN NAMES
01,.01&
DATA
IN
oo,-DOa
DATA
OUT
DSi-
DS
2
DEVICE SELECT
MD
MODE
STB STROBE
INT
INTERRUPT (ACTIVE LOW)
CLR
CLEAR (ACTIVE
LOW)
5-101
LOGIC
DIAGRAM
SERVICE REQUEST FF
\
DEVICE
SELECTION
-~
[DOS1
I!D
OS2
~
MO
----+-
........
L-~
[i>
STB
----...----
11>
01
3-------
....................
[[>
01
4
---------+--+-4
[9DI5-------~
.......
[g>
01
8---------1-
.......
(ACTIVE
LOW)
OUTPUT
BUFFER