we128k32-xxx White Electronic Designs Corporation, we128k32-xxx Datasheet - Page 8

• Manufacturer Part Number: we128k32-xxx
• Description: 128kx32 Eeprom Module, 5962-94585
• Manufacturer: White Electronic Designs Corporation

PAGE WRITE OPERATION
The WE128K32-XXX has a page write operation that
allows one to 128 bytes of data to be written into the device
and consecutively loads during the internal programming
period. Successive bytes may be loaded in the same
manner after the fi rst data byte has been loaded. An
internal timer begins a time out operation at each write
cycle. If another write cycle is completed within 150µs
or less, a new time out period begins. Each write cycle
restarts the delay period. The write cycles can be continued
as long as the interval is less than the time out period.
The usual procedure is to increment the least signifi cant
address lines from A0 through A6 at each write cycle. In
this manner a page of up to 128 bytes can be loaded in
to the EEPROM in a burst mode before beginning the
relatively long interval programming cycle.
After the 150µs time out is completed, the EEPROM
begins an internal write cycle. During this cycle the entire
page of bytes will be written at the same time. The internal
programming cycle is the same regardless of the number
of bytes accessed.
White Electronic Designs Corp. reserves the right to change products or specifi cations without notice.
March 2006
Rev. 10
White Electronic Designs
ADDRESS
DATA
WE#
OE#
CS#
FIGURE 9 – PAGE MODE WRITE WAVEFORMS
8
1. Page address must remain valid for duration of write cycle.
Page Mode Write Characteristics
Parameter
Write Cycle Time, TYP = 6ms
Address Set-up Time
Address Hold Time (1)
Data Set-up Time
Data Hold Time
Write Pulse Width
Byte Load Cycle Time
Write Pulse Width High
PAGE WRITE CHARACTERISTICS
White Electronic Designs Corporation • [phone] • www.wedc.com
(V
CC
= 5.0V, V
SS
= 0V, T
WE128K32-XXX
A
Symbol
= -55°C to +125°C)
t
t
t
t
WPH
t
t
t
t
BLC
WC
WP
AS
AH
DS
DH
Min
100
100
50
10
50
0
Max
150
10
Unit
ms
ns
ns
ns
ns
ns
µs
ns