参数资料
型号: CAT28LV256G-25T
厂商: ON Semiconductor
文件页数: 10/12页
文件大小: 0K
描述: IC EEPROM 256KBIT 250NS 32PLCC
产品变化通告: Product Obsolescence 08/Apr/2011
标准包装: 500
格式 - 存储器: EEPROMs - 并行
存储器类型: EEPROM
存储容量: 256K (32K x 8)
速度: 250ns
接口: 并联
电源电压: 3 V ~ 3.6 V
工作温度: 0°C ~ 70°C
封装/外壳: 32-LCC(J 形引线)
供应商设备封装: 32-PLCC(11.43x13.97)
包装: 带卷 (TR)
其它名称: 28LV256G-25T
CAT28LV256
To activate the software data protection, the device must
be sent three write commands to specific addresses with
specific data (Figure 9). This sequence of commands
(along with subsequent writes) must adhere to the page
write timing specifications (Figure 11). Once this is done,
all subsequent byte or page writes to the device must be
preceded by this same set of write commands. The data
protection mechanism is activated until a deactivate
sequence is issued, regardless of power on/off transi-
tions. This gives the user added inadvertent write pro-
tection on power-up in addition to the hardware protec-
tion provided.
Figure 11. Software Data Protection Timing
To allow the user the ability to program the device with
an E 2 PROM programmer (or for testing purposes) there
is a software command sequence for deactivating the
data protection. The six step algorithm (Figure 10) will
reset the internal protection circuitry, and the device will
return to standard operating mode (Figure 12 provides
reset timing). After the sixth byte of this reset sequence
has been issued, standard byte or page writing can
commence.
DATA
ADDRESS
AA
5555
55
2AAA
A0
5555
tWC
CE
BYTE OR
PAGE
tWP
WE
Figure 12. Resetting Software Data Protection Timing
tBLC
WRITES
ENABLED
DATA
ADDRESS
AA
5555
55
2AAA
80
5555
AA
5555
55
2AAA
20
5555
tWC
SDP
RESET
CE
DEVICE
UNPROTECTED
WE
Doc. No. MD-1071, Rev. E
10
? 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
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