WME128K8-150CC 查看數據表（PDF） - White Electronic Designs Corporation
零件编号
产品描述 (功能)
生产厂家
WME128K8-150CC Datasheet PDF : 11 Pages
| |||
White Electronic Designs
WME128K8-XXX
PAGE WRITE OPERATION
The WME128K8-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 first 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 significant
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.
PAGE WRITE CHARACTERISTICS
VCC = 5.0V, VSS = 0V, -55°C ≤ TA ≤ +125°C
Page Mode Write Characteristics Symbol
Unit
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
Min Max
twc
10 ms
tas
10
ns
tah
100
ns
tds
50
ns
tdh
10
ns
twp 100
ns
tblc
150 µs
twph
50
ns
1. Page address must remain valid for duration of write cycle.
FIGURE 7 – PAGE MODE WRITE WAVEFORMS
OE#
CS#
WE#
t WP
t WPH
t AS
t AH
ADDRESS
VALID
ADDRESS
t DS
t DH
DATA
VALID DATA
BYTE 0
BYTE 1
t BLC
BYTE 2
t WC
BYTE 3
BYTE 127
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
January 2004
Rev. 5
7
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
Share Link: 