收藏本站
X28HC256
System Considerations
WRITE DATA AA
TO ADDRESS
5555
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA 80
TO ADDRESS
5555
WRITE DATA AA
TO ADDRESS
5555
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA 20
TO ADDRESS
5555
AFTER t WC ,
RE-ENTERS
UNPROTECTED
STATE
Because the X28HC256 is frequently used in large memory
arrays, it is provided with a two line control architecture for
both read and write operations. Proper usage can provide
the lowest possible power dissipation, and eliminate the
possibility of contention where multiple I/O pins share the
same bus.
To gain the most benefit, it is recommended that CE be
decoded from the address bus and be used as the primary
device selection input. Both OE and WE would then be
common among all devices in the array. For a read
operation, this assures that all deselected devices are in
their standby mode, and that only the selected device(s)
is/are outputting data on the bus.
Because the X28HC256 has two power modes, standby and
active, proper decoupling of the memory array is of prime
concern. Enabling CE will cause transient current spikes.
The magnitude of these spikes is dependent on the output
capacitive loading of the l/Os. Therefore, the larger the array
sharing a common bus, the larger the transient spikes. The
voltage peaks associated with the current transients can be
suppressed by the proper selection and placement of
decoupling capacitors. As a minimum, it is recommended that
a 0.1μF high frequency ceramic capacitor be used between
V CC and V SS at each device. Depending on the size of the
array, the value of the capacitor may have to be larger.
In addition, it is recommended that a 4.7μF electrolytic bulk
capacitor be placed between V CC and V SS for each eight
devices employed in the array. This bulk capacitor is
employed to overcome the voltage droop caused by the
inductive effects of the PC board traces.
FIGURE 9. WRITE SEQUENCE FOR RESETTING SOFTWARE
DATA PROTECTION
8
FN8108.3
September 21, 2011
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
X28HC64JIZ-90 IC EEPROM 64KBIT 90NS 32PLCC
XCARD XK-1A DEV KIT EVENT-DRIVEN PROC XS1-L1
XCARD XTAG-2 ADAPTER USB DEBUGGER JTAG XSYS2
XE8000EV101 EVAL BOARD FOR XE8801AMI027LF
XG4E-6431-S012 CONN PLUG 64POS 1A OPENED COVER
XLNRC RAPID OUTPUT CONNECTOR
XLT80PT3 SOCKET TRAN ICE 80MQFP/TQFP
XRP6658EVB EVAL BOARD FOR XRP6658
相关代理商/技术参数
X28HC256SM-12 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM
X28HC256SM-12, 制造商:ROCHESTER 制造商全称:ROCHESTER 功能描述:LOW POWER CMOS EEPROM with hi-speed page write capability 256K EEPROM
X28HC256SM-15 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM
X28HC256SM-70 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM
X28HC256SM-90 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM
X28HC256SMB-12 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM
X28HC256SMB-15 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM
X28HC256SMB-70 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5 Volt, Byte Alterable EEPROM