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M8048/M87481 M8035L
WAVEFORMS
Instruction Fetch From External Program Memory
Read
From External Data Memory
1_-'
tL-L~,-'cv-~'1
ALE
JI
~
___
----'r-I
---'L
ALE
J
L
- t
AFC
1-
'cc
~I
tCA
r--
--------r-+_~
~--~------
BUS
Write
to
External Data Memory
Input
and
Output
Waveforms
for
A.C. Tests
ALE
J
L
BUS
"=X
x=
2.0 2.0
> TEST POINTS <
0.8 0.8
0.45
A.C. CHARACTERISTICS
TA
=
-55·C
to
(100·C M8748/125·C M8048/M8035L), Vcc = Voo =
+5V
± 10%, Vss =OV
M8048
M8748
Symbol Parameter
M8035L
Unit
Conditions (Note 1)
Min. Max.
Min.
Max.
tLL
ALE
Pulse
Width 200 300
ns
tAL
Address Setup
to
ALE
120 120
ns
tLA
Address Hold
from
ALE
80
80
ns
tcc
Control
Pulse
Width
(PSEN,
RD,
WR)
400
600
ns
tow
Data Setup before
WR
420
600
ns
two
Data Hold
After
WR
80
120
ns
CL = 20pF
tCY
Cycle Time
2.5
15.0 4.17
15.0
!lS
(3.6 MHz
XTAL
8748)
tOR
Data
Hold
0
200
0 200
ns
tRo
PSEN,
RD
to
Data In
400
600
ns
tAW
Address Setup
to
WR
230 260
ns
tAD
Address Setup
to
Data In
600
900
ns
tAFC
Address Float
to
RD,
PSEN
-40 -60
ns
tCA
Control
Pulse
to
ALE
10
10
ns
Note
1:
Control
outputs:
CL
= 80
pF
tCY
=
2.5J.(5
for
8048/8035 L
BUS
Outputs:
CL
= 150
pF
4.17115
for
8748
6-34
AFN-00780A-08