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8155/8156/8155~218156-2
A.C.
CHARACTERISTICS
ITA
=
o°c
to
70°C;
VCC
=
5V
±
5%)
8155/8156
8155·2/8156-2
(Preliminary)
SYMBOL
PARAMETER
MIN.
MAX.
MIN.
MAX.
UNITS
tAL
Address
to
Latch
Set
Up Time
'.'
50
30
ns
tLA
Address Hold Time after Latch
80
30
ns
tlC
Latch
to
R EAD/WR ITE Control
100
40
ns'
tRO
Valid
Data Out Delay
from
READ Control
170 140
ns
tAO
Address Stable
to
Data
Out Valid
400
330
ns
tll
Latch Enable Width
100
70
ns
tROF
Data
Bus
Float
After
READ
0
100
0
80
ns
tCl
READ/WRITE Control to Latch Enable
20
10
ns
tcc
READ/WRITE Control Width
250
200
ns
tow
Data In
to
WR
ITE
Set
Up Time 150
100
ns
two
Data
In Hold Time
After
WR
ITE 0
0
ns
tRV
Recovery Time Between
Controls 300
200
ns
twp
WR
ITE
to
Port Output
400
300
ns
tPR
Port Input Setup Time 70
50
ns
tRP
Port
Input Hold Time
50
10
ns
tSBF
Strobe
to
Buffer Full 400
300
ns
tss
strobe Width
200
150
ns
tRBE
READ
to
Buffer Empty
400
300
ns
tSI
Strobe
to
INTR
On
400
300
ns
tROI
READ
to
INTR
Off
400
300
ns
tPSS
Port Setup Time
to
Strobe Strobe
50
0
ns
tPHS
Port Hold Time After Strobe
120
100
ns
tSBE
Strobe
to
Buffer Empty 400
300
ns
tWBF
WR
ITE
to
Buffer Full 400
300
ns
tWI
WR
ITE
to
INTR
Off
400
300
ns
tTL
TIMER·IN
to
TIMER·OUT Low
400 300
ns
tTH
TIMER·IN
to
TIMER·OUT High 400 300
ns
tROE
Data
Bus
Enable
from
READ Control
10
10
ns
tl
TIMER·IN
Low Time
80 40
ns
t2
TIMER·IN
High Time
120
70
ns
6·92