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參數(shù)資料
| 型號： | 5962H9689104VXC |
| 廠商： | Aeroflex Inc. |
| 英文描述： | Radiation-Hardened 32K x 8 PROM |
| 中文描述： | 輻射加固32K的× 8胎膜早破 |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 69K |
| 代理商： | 5962H9689104VXC |
4
READ CYCLE
A combination of PE greater than V
IH
(min), and CE less than
V
IL
(max) defines a read cycle. Read access time is measured
from the latter of device enable, output enable, or valid address
to valid data output.
An address access read is initiated by a change in address inputs
while the chip is enabled with OE asserted and PE deasserted.
Valid data appears on data output, DQ(7:0), after the specified
t
AVQV
is satisfied. Outputs remain active throughout the entire
cycle. As long as device enable and output enable are active, the
address inputs may change at a rate equal to the minimum read
cycle time.
The chip enable-controlled access is initiated by CE going active
while OE remains asserted, PE remains deasserted, and the
addresses remain stable for the entire cycle. After the specified
t
ELQV
is satisfied, the eight-bit word addressed by A(14:0)
appears at the data outputs DQ(7:0).
Output enable-controlled access is initiated by OE going active
while CE is asserted, PE is deasserted, and the addresses are
stable. Read access time is t
GLQV
unless t
AVQV
or t
ELQV
have
not been satisfied.
AC CHARACTERISTICS READ CYCLE (Post-Radiation)*
(V
DD
= 5.0V
±
10%; -55
°
C < T
C
< +125
°
C)
Notes:
* Post-radiation performance guaranteed at 25
°
C per MIL-STD-883 Method 1019 at 1E6 rads(Si).
1. Functional test.
2. Three-state is defined as a 400mV change from steady-state output voltage.
SYMBOL
PARAMETER
28F256-45
MIN MAX
28F256-40
MIN MAX
UNIT
t
AVAV1
Read cycle time
45
40
ns
t
AVQV
Read access time
45
40
ns
t
AXQX2
Output hold time
0
0
ns
t
GLQX2
OE-controlled output enable time
0
0
ns
t
GLQV
OE-controlled access time
15
15
ns
t
GHQZ
OE-controlled output three-state time
15
15
ns
t
ELQX
2
CE-controlled output enable time
0
0
ns
t
ELQV
CE-controlled access time
45
40
ns
t
EHQZ
CE-controlled output three-state time
15
15
ns
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