M27C2001
Table 8B. Read Mode AC Characteristics
(1)
(TA = 0 to 70
°C
or –40 to 85
°C;
V
CC
= 5V
±
5% or 5V
±
10%; V
PP
= V
CC
)
M27V2001
Symbol
Alt
Parameter
Test Condition
Min
t
AVQV
t
ELQV
t
GLQV
t
EHQZ (2)
t
GHQZ (2)
t
AXQX
t
ACC
t
CE
t
OE
t
DF
t
DF
t
OH
Address Valid to Output
Valid
Chip Enable Low to
Output Valid
Output Enable Low to
Output Valid
Chip Enable High to
Output Hi-Z
Output Enable High to
Output Hi-Z
Address Transition to
Output Transition
E = V
IL
, G = V
IL
G = V
IL
E = V
IL
G = V
IL
E = V
IL
E = V
IL
, G = V
IL
0
0
0
-10
Max
100
100
50
30
30
0
0
0
Min
-12
Max
120
120
50
40
40
0
0
0
-15/-20/-25
Min
Max
150
150
60
50
50
ns
ns
ns
ns
ns
ns
Unit
Note: 1. V
CC
must be applied simultaneously with or before V
PP
and removed simultaneously or after V
PP
.
2. Sampled only, not 100% tested.
Figure 5. Read Mode AC Waveforms
A0-A17
VALID
tAVQV
tAXQX
VALID
E
tGLQV
G
tELQV
Q0-Q7
tGHQZ
Hi-Z
tEHQZ
AI00719B
Programming
When delivered (and after each erasure for UV
EPROM), all bits of the M27C2001 are in the ’1’
state. Data is introduced by selectively program-
ming ’0’s into the desired bit locations. Although
only ’0’s will be programmed, both ’1’s and ’0’s can
be present in the data word. The only way to
change a ’0’ to a ’1’ is by die exposition to ultravio-
let light (UV EPROM). The M27C2001 is in the
programming mode when V
PP
input is at 12.75V,
E is at V
IL
and P is pulsed to V
IL
. The data to be
programmed is applied to 8 bits in parallel to the
data output pins. The levels required for the ad-
dress and data inputs are TTL. V
CC
is specified to
be 6.25V
±0.25V.
6/16
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