UVEPROM
Austin Semiconductor, Inc.
AS27C256
CAPACITANCE OVER RECOMMENDED RANGES OF SUPPLY VOLTAGE AND OPERAT-
ING FREE-AIR TEMPERATURE, f = 1MHz*
PARAMETER
C
i
C
o
Input capacitance
Output capacitance
TEST CONDITIONS
V
I
= 0V
V
O
= 0V
TYP**
6
10
MAX
10
14
UNIT
pF
pF
* Capacitance measurements are made on a sample basis only.
** Typical values are at T
A
= 25°C and nominal voltages.
SWITCHING CHARACTERISTICS OVER RECOMMENDED RANGES OF SUPPLY VOLT-
AGE AND OPERATING FREE-AIR TEMPERATURE
1,2
PARAMETER
t
a(A)
t
a(E)
Access time from address
Access time from E\
see Figure 2
0
3
TEST
CONDITIONS
1, 2
-12
-15
MIN MAX MIN MAX
120
120
40
30
0
0
150
150
50
30
UNIT
ns
ns
ns
ns
ns
t
en(G)R
Output enable time from G\
t
dis
t
v(A)
Disable time of output from G\ or E\,
whichever occurs first
Output data valid time after change of
address, E\, or G\, whichever occurs first
3
0
PARAMETER
t
a(A)
t
a(E)
Access time from address
Access time from E\
TEST
CONDITIONS
1, 2
-17
170
170
50
-20
200
200
60
0
0
50
0
0
-25
250
250
60
60
MIN MAX MIN MAX MIN MAX
UNIT
ns
ns
ns
ns
ns
t
en(G)R
Output enable time from G\
t
dis
t
v(A)
Disable time of output from G\ or E\,
whichever occurs first
Output data valid time after change of
address, E\, or G\, whichever occurs first
3
3
see Figure 2
0
0
40
NOTES:
1.Timing measurements are made at 2V for logic high and 0.8V for logic low (see figure 2).
2. Common test conditions apply for t
dis
except during programming.
3. Value calculated from 0.5V delta to measured output level. This parameter is only sampled and not 100% tested.
SWITCHING CHARACTERISTICS FOR PROGRAMMING: V
CC
= 6.5V and V
PP
= 12.75V (AMD
FLASHRITE ALGO), T
A
= 25°C
PARAMETER
t
dis(G)
Output disable time from G\
t
en(G)W
Output enable time from G\
MIN
0
MAX
130
150
UNIT
ns
ns
AS27C256
Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
7
AUSTIN [ AUSTIN SEMICONDUCTOR ]
