Tandy 1000
inter
8259A/8259A·2/8259A·8
Technical Reference Manual
ABSOLUTE MAXIMUM RATINGS·
Ambient
Temperature
Under
Bias.
.
.....
O°C
to
70°C
Storage
Temperature.
.
-6S·C
to
+
1S0·C
Voltage
on
Any
Pin
with
Respect
to
Ground
-
O.SV
to
+7V
Power
Dissipation
1
Watt
'NOTICE:
Stresses
above
those
listed
under
"Absolute
Maximum
Ratings"
may
cause
permanent
damage
to
the
device. This
is a stress
rating
only
and
functional
opera-
tion
of
the device
at
these
or
any
other
conditions
above
those
indicated
in the
operational
sections
of
this
specifi-
cation
is
not
implied
-------
160 ns
190 ns
D.C. CHARACTERISTICS
rTA
=
ooc
to
700C,
Vee
=
5V
± 5% (8259A-8),
Vee
= 5V ± 10% (8259A, 8259A-2)]
I
Symbol
Parameter
Min.
Max.
Units Test Conditions
i
VIL
Input
Low
Voltage
-0.5
0.8 V
VIH
Input
High
Voltage
2.0'
Vee
+0.5V
V
VOL
Output
High
Voltage 0.45 V
IOL
= 2.2mA
I
VOH
Output
High
Voltage
24
V
IOH
= -
4OO
Ii
A
I
Interrupt
Output
High
3.5
V
IOH
= -
1OO
Ii
A
VOH(INT)
Voltage
2.4
V
IOH
= -
4OO
Ii
A
III
Input
Load
Current
-10
+10
IiA
OV
,;;VIN ,;;Vee
ILOL
ourput
Leakage
Current
-10
+10
IiA
0.45V ,;;VOUT
,;;Vee
ICC
Vee
Supply
Current
85
mA
IR
Input
Load
Current
-300
IiA
VIN = 0
ILiR
10
IiA
VIN =
Vee
'Note:
For
Extended
Temperature
EXPRESS
V'H
= 2.3V
Test Conditions
+----+--
--~----------~
fc = 1
MHZ
---_
..
-----------<
Unmeas~ed
pins
returned
to
V
ss
A.C.
CHARACTERISTICS ITA =
O°C
to
70°C,
Vee
= 5V
±5%
(8259A-8),
Vee
=
SV
± 10% (8259A, 8259A-2)]
TIMING
REQUIREMENTS
~-----.--~-----
-~-
8259A-8
-r
8259A
--
8259A-2t--
-----
Symbol
Parameter
--.f..
Units Test Conditions
~_
_----=-_~----=-=--__
..Pt1I~"-+-I'.'l~Â¥in.
~
.!i~.
_~ax.
_ _
TAHRL AO/CS Setup
to
RD/INTAJ 50
=1~
0 ns
TRHAX
AO/CS Hold
aft;r
FIT'l/INTA!
--
-
-5--
O~
-
-a--+--
;;;-
------
-f--_.-..
-~f-
-.
-+
--------
TRLRH
RD
Pulse
Width
420 235 I 160 ns
f-.----
----
-
--f---
--~+--
-
--f------
TAHWL AO/CS Setup
to
WRJ
50 0 0 ns
f-----
-
--------
--
--
1----1-------
TWHAX AO/CS
Hold
after
WRI
20 0 0 ns
1--
__
.
__
1---_
---..,
f-
..
-l------
---+-------
---f---.----_
TWLWH
WR
Pulse
Width
400 290 190 ns
f----+-------~--------t---~+_-_+__--
.
__
+-_--+-
+---
__
+---_
-
~-
..
----
TDVWH Data
Setup
to
I;'V~
~o~_
240 160 ns
~....,~~_
,Eata
Hold
af'-e..'~~l_______
__
~
~-+_0____l-_-+_-o---+---+--n-~s
I-----_~
TJLJH
Interrupt
Request
Width
(Low) 100 f---------.
19.~
__
~
__
~~
I---f-_
ns
~_ee_N_a.~
TCVIAL Cascade
Setup
to
Second
or
Th"d
55 55 40 ns
f-
~-('-S_--la-ve_-O-n-'-ly:...)
------+---+---+----+----+----f-----I--
..
--+-.----.--
End of
RD
to
next
RD
I
TRHRL
En~NTA
to
next
INTA
within
160 160
an INTA
sequence
only
.-i---
TWHWL End
of
WR
to
next
WR---------·
I
190-
f-~-90
2-134