Radio Shack 26-3801 - Page 48

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SYMBOL
PARAMETER
MIN.
MAX
UNITS TEST CONDITIONS
VlL
Input Low
Voltage
-0.3V
0.8 V
V,H
Input
High Voltage
9 9
v
cc+n
T
V
vbL
Output
Low
Voltaga
0.45
'V
bu
"
2mA
M3H
Output
High Voltaga
2.4
V
Ioh
-
-400mA
'IL
Input
Leakage
±10 ma
Vim
.-
V
cc
to
0V
"to
Output
Leakage Current
±10
HA
.
0.45V
<
V
UT
<
V
CC
tec
Vcc
Supply
Current
5
mA
Table
.8
D.C.
characteristics
nsec
SYMBOL PARAMETER
MIN.
MAX.
«AL
Address to Latch Set
Up
Time
50
«LA
Address
Hold Time after Latch
80
«LC
Latch
to READ/WRITE
Control
100
'HO
Valid Data Out Delay
tram READ
Control
170
<AO
Address Stable to
Data Out
Valid
400
«LL
Latch
Enable
Width
100
*ROF
Data Bus
Float After READ
100
tCL
READ/WRITE Control to Latch
Enable
20
tec
HEAD/WRITE Control Width
250
'DW
Data In to
WRITE
Set
Up
Time
150
two
Data In Hold
Time After WRITE
tRV
Recovery Time Between Controls
300
twe
WRITE
to
Port
Output
400
'PR
Port Input
Setup
Time
70
*RP
Port Input Hold Time
50
«SBF
Strobe to
Buffer Full
400
>SS
Strobe Width
200
*RB6
READ to Buffer Empty
400
«S1
Strobe to
INTR
On
400
l
ROI
READ to
INTR Off
400
tPSS
Port Setup
Time
to Strobe
Strobe
50
'PMS
Port
Hold Time After Strobe
120
l
SBE
Strobe to
Buffer
Empty
400
*WBF
WRITE
to
Buffer Full
400
*wi
WRITE to
INTR Off
400
<TL
TIMER-IN
to
TIMER-OUT Low
400
«TH
TIMER-IN
to
TIMER-OUT High
400
l
HOE
Data Bus
Enable from READ
Control
*
10
tl
TIMER-IN Low Time
'
80
'2
TIMER-IN
High
Time
120
Table
9
A.C.
characteristics