Intel MCS48 User Manual page 229

8155/8156/8155-2/8156-2
A.C.
CHARACTERISTICS
(t
a
=
o°c
to
70°c
;
v
cc
=
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
READ/WRITE
Control
100
40 ns
tRD Valid
Data
Out Delay
from
READ
Control
170
140
ns
*AD
Address Stable to Data
Out
Valid
400 330
ns
tLL
Latch Enable
Width
100
70
ns
tRDF
Data
Bus Float After
READ
100 80 ns
tCL
READ/WRITE
Control
to
Latch Enable
20 10
ns
tec
READ/WRITE
Control
Width
250
200
ns
*DW
Data
In
to
WRITE
Set
Up Time
150
100 ns
t\WD
Data
In
Hold
Time
After
WRITE
ns
*RV
Recovery
Time Between
Controls
300
200 ns
*WP
WRITE
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
*RBE
R
EAD
to Buffer
Empty
400
300 ns
tsi
Strobe to
INTR
On
400
300
ns
tRDI
READ
to
INTR
Off
400
300
ns
tpss
Port
Setup
Time
to
Strobe Strobe
50 ns
tPHS
Port
Hold
Time
After Strobe
120 100
ns
tSBE
Strobe to Buffer
Empty
400
300
ns
tWBF
WRITE
to Buffer
Full
400
300
ns
twi
WRITE
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
*RDE
Data Bus Enable
from
READ
Control
10
10
ns
^1
TIMER-IN Low
Time
80
40
ns
t
2
TIMER-IN
High
Time 120
70
ns
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