X28HC256
Write Cycle Limits
TYP
PARAMETER
SYMBOL
MIN
(Note 6)
MAX
UNIT
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
ns
ns
µs
µs
Write Cycle Time
Address Setup Time
Address Hold Time
Write Setup Time
Write Hold Time
tWC (Note 7)
3
5
tAS
tAH
0
50
0
tCS
tCH
0
CE Pulse Width
tCW
50
0
OE HIGH Setup Time
OE HIGH Hold Time
WE Pulse Width
tOES
tOEH
tWP
0
50
50
WE HIGH Recovery (page write only)
tWPH (Note 8)
tDV
Data Valid
1
Data Setup
tDS
50
0
Data Hold
tDH
Delay to Next Write After Polling is True
Byte Load Cycle
t
DW (Note 8)
tBLC
10
0.15
100
NOTES:
6. Typical values are for TA = +25°C and nominal supply voltage.
7. tWC is the minimum cycle time to be allowed from the system perspective unless polling techniques are used. It is the maximum time the device
requires to automatically complete the internal write operation.
8. tWPH and tDW are periodically sampled and not 100% tested.
WE Controlled Write Cycle
t
WC
ADDRESS
t
t
AH
AS
t
t
CS
CH
CE
OE
t
t
OEH
OES
t
WP
WE
DATA IN
DATA OUT
DATA VALID
HIGH Z
t
t
DH
DS
FN8108.2
May 7, 2007
13
ROCHESTER [ Rochester Electronics ]
