X28HC256JIZ-15T1 Intersil, X28HC256JIZ-15T1 Datasheet - Page 6

• Manufacturer Part Number: X28HC256JIZ-15T1
• Description: IC EEPROM 256KBIT 150NS 32PLCC
• Manufacturer: Intersil

Specifications of X28HC256JIZ-15T1

• Format - Memory: EEPROMs - Parallel
• Memory Type: EEPROM
• Memory Size: 256K (32K x 8)
• Speed: 150ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DATA Polling I/O
FIGURE 3. DATA POLLING SOFTWARE FLOW
A
0
TO A
I/O
WE
CE
OE
SAVE LAST DATA
14
AND ADDRESS
7
COMPLETE?
WRITE DATA
READ LAST
COMPARE?
ADDRESS
X28HC256
WRITES
WRITE
READY
LAST
IO
7
V
An
IH
7
YES
YES
6
NO
An
NO
HIGH Z
FIGURE 2. DATA POLLING BUS SEQUENCE
An
V
OL
X28HC256
An
DATA Polling can effectively halve the time for writing to the
X28HC256. The timing diagram in Figure 2 illustrates the
sequence of events on the bus. The software flow diagram in
Figure 3 illustrates one method of implementing the routine.
An
An
An
V
X28HC256
READY
OH
May 7, 2007
FN8108.2