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參數(shù)資料
| 型號： | 28C256 |
| 英文描述： | 32K-Bit Parallel E2PROM |
| 中文描述： | 32K的位并行E2PROM的 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 113K |
| 代理商： | 28C256 |
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 |
|---|---|
| 28C256 | LABELS,LABELS IN DISPENSER,LABELS,PRE-PRINTED MARKER LABELS,LOCKOUT/TAGOUT PRODUCTS,LABELS IN DISPENSER ,PANDUIT |
| 28C64A | 64K (8K x 8) CMOS EEPROM(64K位, CMOS并行 EEPROM) |
| 28C64AFT-15ITS | LJT 41C 41#20 PIN PLUG |
| 28C64AFT-15IVS | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| 28C64AFT-15L | Circular Connector; No. of Contacts:11; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:21; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:21-11 RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 28C256-12/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x8 EEPROM |
| 28C256-12/J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x8 EEPROM |
| 28C256-12/K | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x8 EEPROM |
| 28C256-12/L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x8 EEPROM |
| 28C256-12/P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x8 EEPROM |
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