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8212
8-BIT INPUT/OUTPUT PORT
• Fully Parallel8-Bit Data Register and Buffer
• Service Request Flip-Flop for
Interrupt Generation
• Low Input Load Current - .2SmA Max.
• Three State Outputs
• Outputs Sink 1SmA
• 3.6SV Output High Voltage for
Direct
Interface to 8008, 8080A, or
808SA CPU
• Asynchronous Register Clear
• Replaces Buffers, Latches and
Multiplexers
in
Microcomputer 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
multi mode in nature. It can
be
used
to
implement latches, gated buffers
or
multiplexers. Thus, all
of
the
principal peripheral and
input/output
functions
of
a microcomputer system can be implemented with this device.
PIN CONFIGURATION
os,
vee
MO
INT
01,
01.
DO,
DO.
01
2
01
7
00
2
00
7
01
3
DI.
00
3
DO.
01.
01
5
DO.
00
5
STe
CLR
GNO
OS2
PIN NAMES
8-24
IT> os,
[i]>
oS2
LOGIC
DIAGRAM
SERVICE
A~UEST
FF
[[>
Mo
-----t-<H_~
ID>
STB
----+--;_J
IT>
0',
---------++t
OATA
LATCH
[B>o',
-------=-+t
Vo'3
----------t-+t
[E> D
'.
--------I-+t
GD
~'s
-------+-H
IT>
D
'6
---------7--H
~
D',
--------++1
0>
D'B
----------'--+i
IE>
Cl
R
-----4
OUTPUT
BUFFER
DOsIE>
AFN-00731
A-o,