參數(shù)資料
型號(hào)： X28C256EI
英文描述： Voltage Regulator IC; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes RoHS Compliant: Yes
中文描述： 5伏，可變E2PROM的字節(jié)
文件頁(yè)數(shù)： 9/24頁(yè)
文件大?。?/td> 113K
代理商： X28C256EI
X28C256
9
SYSTEM CONSIDERATIONS
Because the X28C256 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 elimi-
nate 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 outputting data on the bus.
Because the X28C256 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 I/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 0.1
μ
F high fre-
quency 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 4.7
μ
F 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.
Normalized Active Supply Current
vs. Ambient Temperature
Normalized Standby Supply Current
vs. Ambient Temperature
–55
+25
+125
0.6
0.8
1.0
1.2
1.4
VCC = 5V
AMBIENT TEMPERATURE (
°
C)
NC
–55
+25
+125
0.6
0.8
1.0
1.2
1.4
VCC = 5V
AMBIENT TEMPERATURE (
°
C)
NS
3855 FHD F20.1
3855 FHD F21.1
相關(guān)PDF資料
PDF描述
X28C256EM 5 Volt, Byte Alterable E2PROM
X28C256EMB 5 Volt, Byte Alterable E2PROM
X28C256EMB-20 5 Volt, Byte Alterable E2PROM
X28C256EMB-25 5 Volt, Byte Alterable E2PROM
X28C256EMB-35 5 Volt, Byte Alterable E2PROM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
X28C256EI-20 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:5 Volt, Byte Alterable E2PROM
X28C256EI-25 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:5 Volt, Byte Alterable E2PROM
X28C256EI-35 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:5 Volt, Byte Alterable E2PROM
X28C256EM 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:5 Volt, Byte Alterable E2PROM
X28C256EM-20 制造商:XICOR 制造商全稱(chēng):Xicor Inc. 功能描述:5 Volt, Byte Alterable E2PROM
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