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8041
AJ8641
AJ8741
A
8741A Erasure Characteristics
The erasure characteristics
of
the 8741A are such that
erasure begins
to
occur when exposed
to
light with
wavelengths shorter than approximately
4000 Ang·
stroms
(A).
It
should
be
noted that sunlight and certain
types
of
fluorescent lamps have wavelengths
In
the
3000-4000A range. Data show that constant exposure
to
room level fluorescent lighting could erase the typical
8741A in approximately 3 years while
it
would take ap·
proximately one week
to
cause erasure when exposed
to
direct sunlight.
If
the 8741A is
to
be
exposed to these
types
of
lighting conditions for extended periods of
time, opaque
labels are available from Intel which
should
be
placed over the 8741A window
to
prevent
unintentional erasure.
The recommended erasure procedure for the 8741A is
exposure
to
shortwave ultraviolet light which has a
wavelength of
2537
A.
The integrated dose (i.e.,
UV
inten·
sity x exposure time) for erasure should
be
a minimum
of
15
w·sec/cm
2
.
The erasure time with this dosage is
approximately
15
to
20
minutes using
an
ultraviolet
lamp with a 12,000
,..W/cm
2
power rating. The 8741A
should
be
placed within one inch of the lamp tubes
duro
ing erasure. Some lamps
have
a
filter
on
their tubes
which
should
be
removed before erasure.
A.C. TIMING SPECIFICATION FOR PROGRAMMING
TA
= 25°C
±5°C,
Vcc =
5V
±5%,
Voo = 25V
±1V
Symbol Parameter
Min.
Max. Unit
Test Conditions
tAW
Address Setup Time to
RESET
t
4tcy
tWA
Address Hold Time After
RESET
t
4tcy
tow Data
in
Setup Time to
PROG
I 4tcy
two
Data in
Hold Time After
PROG
I
4tcy
tPH
RESET
Hold Time to Verify
4tcy
tvoow
Voo Setup Time
to
PROG
t
4tcy
tVOOH
Voo Hold Time After
PROG
I
0
tpw
Program
Pulse Width
50
60
mS
trw
Test 0 Setup Time for Program Mode
4tcy
tWT
Test 0 Hold Time After Program Mode
4tcy
too
Test 0 to Data Out Delay
4tcy
tww
RESET
Pulse Width to Latch Address
4tcy
tr, tf
Voo
and
PROG
Rise and
Fall
Times
0.5
2.0
I-'S
tCY
CPU
Operation Cycle Time
5.0
I-'S
tRE
RESET
Setup Time Before
EA
t.
4tcy
Note:
If
TEST
0
is
high,
too can
be
triggered
by
RESET
t.
D.C.
SPECIFICATION FOR PROGRAMMING
TA
= 25°C
±5°C,
Vcc =
5V
±5%,
Voo =
25V
±1V
Symbol
Parameter Min. Max. Unit Test Conditions
VOOH
Voo
Program Voltage High
~evel
24.0
26.0
V
VDOL
VOD
Voltage Low Level
4.75
5.25
V
VPH
PROG
Program Voltage High Level
21.5
24.5
V
VpL
PROG
Voltage Low Level
0.2
V
VEAH
EA
Program or Verify Voltage High Level
21.5
24.5
V
VEAL
EA
Voltage Low Level
5.25
V
100
VDD
High Voltage Supply Current 30.0
mA
IPROG
PROG
High Voltage Supply Current
16.0
mA
lEA
EA
High Voltage Supply Current
1.0
mA
9-131
0018BA