Tandy 1000
8284A/8284A-1
Technical Reference Manual
ABSOLUTE MAXIMUM RATINGS·
Temperature Under Bias O·C
to
7q·C
Storage Temperature
-65·C
to
+
150·C
All
Output
and Supply Voltages - 0.5V
to
+7V
All
Input
Voltages.
. . .
-1.0V
to
+5.5V
Power
Dissipation
1Watt
·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.
Exposure
to
absolute
maximum
rating
conditions
for
extended
periods
may
affect
device
reliability.
D.C. CHARACTERISTICS
(TA=O·C
to
70·C,
Vcc=
5V±
10%)
Symbol Paramatar Min. Max.
Units
Tast
Conditions
IF
Forward
Input
Current (ASYNC)
-1.3
mA
VF=0.45V
Other
Inputs
-0.5
rnA
VF=0.45V
I
R
Reverse Input Current (ASYNC)
50
,..A
V
R
=
Vee
Other
Inputs
50
,..A
VA= 5.25V
Vc
Input Forward Clamp Voltage
-1.0
V
Ic=
-5mA
Icc
Power Supply Current 162 mA
V'L
Input
lOW
Voltage
0.8 V
V'H
Input HIGH Voltage
2.0 V
V'HA
Reset Input HIGH Voltage
2.6
V
VOL
Output
lOW
Voltage 0.45 V
5mA
VO
H
Output
HIGH Voltage
ClK
4 V
-lrnA
Other
Outputs
2.4
V
-lrnA
V
,HA
-
V'LA
RES
Input Hysteresis 0.25 V
A.C. CHARACTERISTICS (TA= O·C
to
70·C, V
cc
=
5V±
10%)
TIMING REQUIREMENTS
Symbol
Paramatar
Min.
Max.
Units
rast
Conditions
tEHEL
External Frequency HIGH Time
13
ns
90%-90%
Y'N
tELEH
External Frequency
lOW
Time
13
ns
10%-10%
Y'N
tELEL
EFI Period
33
ns (Note
1)
XTAl
Frequency
12
25
MHz
tR1VCL
ROY1, ROY2 Active Setup
to
ClK
35 ns
ASYNC=
HIGH
tA1VCH
ROY1,
ROY2
Active Setup
to
ClK
35 ns
ASYNC=
lOW
tA1VCL
ROY1,
ROY2
Inactive Setup
to
ClK
35
ns
tCLR1X
ROY1,
ROY2
Hold
to
ClK
0
ns
tAYVCL
ASYNC Setup
to
ClK
50
ns
tCLAYX
ASYNC Hold
to
ClK
0
ns
tA1VA1V
AEN1,
AEN2
Setup
to
ROY1,
ROY2
15
ns
tCLA1X
AEN1, AEN2 Hold
to
ClK
0
ns
tYHEH
CSYNC Setup
to
EFI
20 ns
tEHYL
CSYNC Hold
to
EFI
10
ns
t
YHYL
CSYNC
Width
2·
tELEL
ns
t
l1
HCL
~
Setup
to
ClK
65 ns
(Note
1)
tCLllH
RES
Hold
to
ClK
20 ns (Note 1)
3-570
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