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ID8048/8748/8035L
WAVEFORMS
Instruction Fetch From External
Program
Memory
Read
From External
Data
Memory
1-~tL-L_I-'cv~-'1
ALE
JI
!-
___
~r---I
--"L
ALE J
L
teA
r-
1-
tcc-I
teA
I--
-----1
I
BUS
tAFc-1
I--;~OATING-I
tt
oR
BUS
~
--FL-O-AT-'N-G--
I
l.tRo-1
--
t
AO
-------
Write
to
External
Data
Memory
Input and Output Waveforms
for
A.C. Tests
ALE J
L
0::
======~~-:.lX~:~>TEST
POINTS:::::~:~X\"
____
_
BUS
A.C. CHARACTERISTICS
T
A
=
-40·Cto
+85·C,
Vcc=Voo=
+5V
±10%,
Vss=OV
Symbol Parameter
8048/8035L
8748/8035
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 C
L
=20
pF
tCY
Cycle Time 2.5 15.0 4.17 15.0
fJs
(3.6 MHzXTAL8748/8035)
tOR
Data Hold
0 200 0
200 ns
t
RO
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
t
AFC
Address Float
to
RD,
PSEN
-40
- 60
ns
tCA
Control Pulse
to
ALE
10 10
ns
Note
1:
Control
Outputs:
CL:
80
pF
tCy:2.5~s
for804818035L
BUS
Outputs:
CL:
150
pF
4.17
~
for
874818035
6-22
AFr>HlO860A·05