28C256T
256K EEPROM (32K x 8-Bit) EEPROM
TABLE 8. 28C256T AC ELECTRICAL CHARACTERISTICS FOR PAGE/BYTE ERASE AND WRITE OPERATIONS
(VCC = 5.0V ±10%, TA = -55 TO 125 °C UNLESS OTHERWISE SPECIFIED)
1
PARAMETER
SYMBOL
TYP
MAX
UNITS
MIN
Byte Load Window4
tBL
us
-120
-150
-200
--
--
--
100
100
200
--
--
--
Byte Load Cycle4
tBLC
us
ns
-120
-150
-200
0.55
0.55
0.55
--
--
--
30
30
30
Write Start Time
tDW
-120
-150
-200
150
150
250
--
--
--
--
--
--
1. Use this device in a longer cycle than this value.
2. WE controlled operation.
3. CE controlled operation.
4. Not tested.
1
TABLE 9. 28C256T MODE SELECTION
MODE
CE
VIL
OE
WE
I/O
Write
VIL
X
VIH
X
DOUT
HIGH-Z
DIN
2
Standby
Write
VH
VIL
VIL
X
VIH
VIH
X
VIL
VIH
VIH
X
Deselect
Write Inhibit
HIGH-Z
--
X
VIL
VIL
--
Data\ Polling
Program
VIL
VIH
DATA-OUT
(I/O7)
X
X
X
HIGH-Z
1. X = Does not matter.
2. VH = Vcc
All data sheets are subject to change without notice
6
03.20.15 Rev 6
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