Datasheet > MSM5412222A-30JA

MSM5412222A-30JA

更新时间： 2024-12-01 05:55:11

品牌	Logo	应用领域
冲电气 - OKI		光电二极管内存集成电路
页数	文件大小	规格书
16页	137K
描述
Memory Circuit, 256KX12, CMOS, PDSO40, 0.400 INCH, 1.27 MM PITCH, PLASTIC, SOJ-40

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MSM5412222A-30JA 数据手册

FEDS5412222A-02

This version:

Aug. 2000

Previous version: Sep. 1999

Semiconductor

MSM5412222A

262,214-Word × 12-Bit Field Memory

DESCRIPTION

The OKI MSM5412222A is a high performance 3-Mbit, 256K × 12-bit, Field Memory. It is especially designed

for high-speed serial access applications such as HDTVs, conventional NTSC TVs, VTRs, digital movies and

Multi-media systems. MSM5412222A is a FRAM for wide or low end use in general commodity TVs and VTRs

exclusively. MSM5412222A is not designed for the other use or high end use in medical systems, professional

graphics systems which require long term picture storage, data storage systems and others. More than two

MSM5412222As can be cascaded directly without any delay devices among the MSM5412222As. (Cascading of

MSM5412222A provides larger storage depth or a longer delay).

Each of the 12-bit planes has separate serial write and read ports. These employ independent control clocks to

support asynchronous read and write operations. Different clock rates are also supported that allow alternate data

rates between write and read data streams.

The MSM5412222A provides high speed FIFO, First-In First-Out, operation without external refreshing:

MSM5412222A refreshes its DRAM storage cells automatically, so that it appears fully static to the users.

Moreover, fully static type memory cells and decoders for serial access enable the refresh free serial access

operation, so that serial read and/or write control clock can be halted high or low for any duration as long as the

power is on. Internal conflicts of memory access and refreshing operations are prevented by special arbitration

logic.

The MSM5412222A’s function is simple, and similar to a digital delay device whose delay-bit-length is easily set

by reset timing. The delay length, number of read delay clocks between write and read, is determined by externally

controlled write and read reset timings.

Additional SRAM serial registers, or line buffers for the initial access of 256 × 12-bit enable high speed first-bit-

access with no clock delay just after the write or read reset timings.

Additionally, the MSM5412222A has write mask function or input enable function (IE), and read-data skipping

function or output enable function (OE) . The differences between write enable (WE) and input enable (IE), and

between read enable (RE) and output enable (OE) are that WE and RE can stop serial write/read address

increments, but IE and OE cannot stop the increment, when write/read clocking is continuously applied to

MSM5412222A. The input enable (IE) function allows the user to write into selected locations of the memory

only, leaving the rest of the memory contents unchanged. This facilitates data processing to display a “picture in

picture” on a TV screen.

The MSM5412222A is similar in operation and functionality to OKI 1-Mbit Field Memory MSM514222C and

2-Mbit Field Memory MSM518222A. Three MSM514222Cs or one MSM514222C plus one MSM518222A can

be replaced simply by one MSM5412222A.

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与MSM5412222A-30JA相关器件

型号	品牌	获取价格	描述	数据表
MSM5412222A-30JS	OKI	获取价格	Memory Circuit, 256KX12, CMOS, PDSO40, 0.400 INCH, 1.27 MM PITCH, PLASTIC, SOJ-40
MSM5412222A-30TA	OKI	获取价格	Memory Circuit, 256KX12, CMOS, PDSO44, 0.400 INCH, 0.8 MM PITCH, PLASTIC, TSOP2-44
MSM5412222A-30TS-K	OKI	获取价格	Memory Circuit, 256KX12, CMOS, PDSO44, 0.400 INCH, 0.8 MM PITCH, PLASTIC, TSOP2-44
MSM5412222B	OKI	获取价格	262,214-Word 】 12-Bit Field Memory
MSM5412222B-25JS	OKI	获取价格	262,214-Word 】 12-Bit Field Memory
MSM5412222B-25TS-K	OKI	获取价格	262,214-Word 】 12-Bit Field Memory
MSM5412222B-30JS	OKI	获取价格	262,214-Word 】 12-Bit Field Memory
MSM5412222B-30TS-K	OKI	获取价格	262,214-Word 】 12-Bit Field Memory
MSM5412222B-XXJS	OKI	获取价格	262,214-Word 】 12-Bit Field Memory
MSM5412222B-XXTS-K	OKI	获取价格	262,214-Word 】 12-Bit Field Memory

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