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8048/8035L/8748/8748-6/8748-8/8035/8035-8
WAVEFORMS
Instruction Fetch From External Program Memory
Read
From External Data MemorY
I===i---
h
·1
ALE J
IL--
___
~I
---'L
ALE
J
L
1--
'ee
--I
'eA
I---
RD
----II
.1
BUS
'm
~I
I~FLOATlNG~1
i,'OR
BUS
~
--FL-O-AT-'N-G--
1
1.'Ro-1
-t
AD
--
Write
to
External Data Memory
Input and
Output
Waveforms for A.C. Tests
ALE
J
L
WR
2.4----"'"\
)(
2.2-...
..,2.2V
_
____
J
O,S--
TEST
POINTS
........
O
.
sA
0.45
'-----
BUS
A.C. CHARACTERISTICS T A =
O·C
to
WC',
Vee
= V
DD
= +
5V
;:
10%
,Vss =
OV
.1
8048
18748-8**
8748-6
Symbol
Parameter
874818035/8035L
8035·8
Unit
I
Conditions
(Note 1)
Min. Max.
Min.
Max.
tLL
ALE
Pulse
Width
400
600
ns
tAL
Address
Setup
to
ALE
120
150
ns
tLA
Address
Hold
from
ALE
80 80
ns
tcc
Control
Pulse
Width (PSEN, RO, WR) 700
1500
ns
tow
Data
Setup before
WR
500
640
ns
two
Data
Hold After
WR
120
120
ns
CL
= 20pF
tCY
Cycle
Time
2.5
15,0
4.17 15.0
IJS
6 MHz
XTAL=2.5
(3.6 MHz XTAL
for
- 8
tOR
Data
Hold
U
200 0 200
ns
tRO
PSEN,
RO
to
Data
In
500
750
ns
tAW
Address Setup
to
WR
230 260
ns
tAO
Address Setup
to
Data
In
950 1450
ns
tAFC
Address
Float to
RD,
PSEN
0 0
ns
tCA
Control
Pulse
to
ALE
10
20
ns
Note t: Control outputs'
CL
=
SO
pF
ICV = 2.5
~s
lor
standard parts
*T
A
=
O·Cto55-Cfor8748-8
BUS
Outputs:
CL=
tSO
pF
=4.17
~s
lor-8
parts
uVCCand
VOO
for
8748-8 and 8035-6 are ±5'1.
6-13
AFN'()I354A-05,