- 您现在的位置：买卖IC网 > PDF目录365271 > MSM518221A-25ZS (OKI SEMICONDUCTOR CO., LTD.) 262,214-Word x 8-Bit Field Memory PDF资料下载
参数资料
| 型号： | MSM518221A-25ZS |
| 厂商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 262,214-Word x 8-Bit Field Memory |
| 中文描述： | 262214字× 8位字段记忆 |
| 文件页数： | 5/17页 |
| 文件大小： | 200K |
| 代理商： | MSM518221A-25ZS |
Semiconductor
MSM518221A
5/16
OPERATION
Write Operation
The write operation is controlled by three clocks, SWCK, RSTW, and WE. Write operation is
accomplished by cycling SWCK, and holding WE high after the write address pointer reset operation
or RSTW.
Each write operation, which begins after RSTW, must contain at least 80 active write cycles, i.e.
SWCK cycles while WE is high. To transfer the last data to the DRAM array, which at that time
is stored in the serial data registers attached to the DRAM array, an RSTW operation is required
after the last SWCK cycle.
Write Reset : RSTW
The first positive transition of SWCK after RSTW becomes high resets the write address counters to
zero. RSTW setup and hold times are referenced to the rising edge of SWCK. Because the write reset
function is solely controlled by the SWCK rising edge after the high level of RSTW, the states of WE
and IE are ignored in the write reset cycle.
Before RSTW may be brought high again for a further reset operation, it must be low for at least two
SWCK cycles.
Data Inputs : D
IN
0 - 7
Write Clock : SWCK
The SWCK latches the input data on chip when WE is high, and also increments the internal write
address pointer. Data-in setup time t
DS
, and hold time t
DH
are referenced to the rising edge of SWCK.
Write Enable : WE
WE is used for data write enable/disable control. WE high level enables the input, and WE low level
disables the input and holds the internal write address pointer. There are no WE disable time (low)
and WE enable time (high) restrictions, because the MSM518221A is in fully static operation as long
as the power is on. Note that WE setup and hold times are referenced to the rising edge of SWCK.
Input Enable : IE
IE is used to enable/disable writing into memory. IE high level enables writing. The internal write
address pointer is always incremented by cycling SWCK regardless of the IE level. Note that IE setup
and hold times are referenced to the rising edge of SWCK.
相关PDF资料 |
PDF描述 |
|---|---|
| MSM518221A-30GS-K | 262,214-Word x 8-Bit Field Memory |
| MSM518221A-30JS | 262,214-Word x 8-Bit Field Memory |
| MSM518221A-30ZS | 262,214-Word x 8-Bit Field Memory |
| MSM518221A-40GS-K | 262,214-Word x 8-Bit Field Memory |
| MSM518221A-40JS | 262,214-Word x 8-Bit Field Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MSM518221A-30GS-K | 制造商:OKI 制造商全称:OKI electronic componets 功能描述:262,214-Word x 8-Bit Field Memory |
| MSM518221A-30J3 | 制造商:ROHM Semiconductor 功能描述: |
| MSM518221A-30J3-7 | 制造商:ROHM Semiconductor 功能描述: |
| MSM518221A-30JS | 制造商:ROHM Semiconductor 功能描述: |
| MSM518221A-30Z3 | 制造商:ROHM Semiconductor 功能描述: |
发布紧急采购，3分钟左右您将得到回复。