X28C256
ENDURANCE AND DATA RETENTION
Parameter
Min.
Units
Endurance
100,000
100
Cycles
Years
Data Retention
3855 PGM T05.3
POWER-UP TIMING
Symbol
Parameter
Power-up to Read Operation
Power-up to Write Operation
Max.
Units
(4)
t
t
100
5
µs
PUR
(4)
ms
PUW
3855 PGM T06
CAPACITANCE T = +25°C, f = 1MHz, V = 5V
A
CC
Symbol
Parameter
Max.
Units
Test Conditions
(4)
C
C
Input/Output Capacitance
Input Capacitance
10
6
pF
pF
V
V
= 0V
= 0V
I/O
I/O
(4)
IN
IN
3855 PGM T07.1
A.C. CONDITIONS OF TEST
MODE SELECTION
Input Pulse Levels
0V to 3V
CE
L
OE
L
WE
H
Mode
Read
Write
I/O
Power
Active
D
D
OUT
IN
Input Rise and
Fall Times
L
H
L
Active
10ns
1.5V
H
X
X
Standby and
Write Inhibit
High Z
Standby
Input and Output
Timing Levels
3855 PGM T08.1
X
X
L
X
H
Write Inhibit
Write Inhibit
—
—
—
X
—
3855 PGM T09
Note: (4) This parameter is periodically sampled and not 100% tested.
EQUIVALENT A.C. LOAD CIRCUIT
SYMBOL TABLE
5V
WAVEFORM
INPUTS
OUTPUTS
Must be
steady
Will be
steady
1.92KΩ
OUTPUT
May change
from LOW
to HIGH
Will change
from LOW
to HIGH
1.37KΩ
100pF
May change
from HIGH
to LOW
Will change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
Changing:
State Not
Known
3855 FHD F22.3
N/A
Center Line
is High
Impedance
11
XICOR [ XICOR INC. ]
