OKI MSM5412222A-25JS, MSM5412222A-25TS-K, MSM5412222A-30JS, MSM5412222A-30TS-K Datasheet

OKI Semiconductor

MSM5412222A REVISION-3 1999.6.10

262,214-Word x 12-Bit Field Memory

DESCRIPTION

The OKI MSM5412222A is a high performance 3-Mbit, 256K X 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 high end use in medical systems, professional graphics systems which require long term picture storage, data storage systems and others. Two or more MSM5412222As can be cascaded directly without any delay devices between them. (Cascading 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, which 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, and the 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 X 12-bit enable high speed first-bit-access with no clock delay just after the write or read reset timings.

Additionally, the MSM5412222A has a 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.

OKI Semiconductor MSM5412222A

FEATURES

Single power supply : 5 V ±10%

512 Rows X 512 Columns X 12 bits

Fast FIFO (First-In First-Out) operation

High speed asynchronous serial access

Read/write cycle time	25 ns/30 ns
Access time	23 ns/25 ns
Direct cascading capability

Write mask function (Input enable control)

Data skipping function (Output enable control)

Self refresh (No refresh control is required)

Package options:

44-pin 400 mil plastic TSOP (Type II) (TSOPII44-P-400-0.80-K) (Product : MSM5412222A-xxTS-K)

40-pin 400 mil plastic SOJ	(SOJ40-P-400-1.27)	(Product : MSM5412222A-xxJS)
		xx indicates speed rank.

PRODUCT FAMILY

	Family	Access Time(Max.)	Cycle Time(Min.)	Package
	MSM5412222A-25TS-K	23ns	25ns	400 mil 44-Pin TSOP(þ)
	MSM5412222A-30TS-K	25ns	30ns
	MSM5412222A-25JS	23ns	25ns	400 mil 40-pin SOJ
	MSM5412222A-30JS	25ns	30ns

2

	OKI Semiconductor					MSM5412222A
	PIN CONFIGURATION(TOP VIEW)
	Vss	1	44	Vss	Vss 1	40	Vss
	DIN11	2	43	DOUT11	NC 2	39	NC
	DIN10	3	42	DOUT10
					DIN11 3	38	DOUT11
	NC	4	41	NC
	DIN9	5	40	DOUT9	DIN10 4	37	DOUT10
	DIN8	6	39	DOUT8
					DIN9 5	36	DOUT9
	DIN7	7	38	DOUT7
	DIN6	8	37	DOUT6	DIN8 6	35	DOUT8
	NC	9	36	NC
					DIN7 7	33	DOUT7
	DIN5	10	35	DOUT5
	DIN4	11	34	DOUT4	DIN6 8	34	DOUT6
	DIN3	12	33	DOUT3
					DIN5 9	32	DOUT5
	DIN2	13	32	DOUT2
	NC	14	31	Vss	DIN4 10	31	DOUT4
	DIN1	15	30	DOUT1
					DIN3 11	30	DOUT3
	DIN0	16	29	DOUT0
	SWCK	17	28	SRCK	DIN2 12	29	DOUT2
	RSTW	18	27	RSTR
					DIN1 13	28	DOUT1
	NC	19	26	NC
	WE	20	25	RE	DIN0 14	27	DOUT0
	IE	21	24	OE
					SWCK 15	26	SRCK
	Vcc	22	23	Vcc
					RSTW 16	25	RSTR
			44-PIN Plastic TSOP(Œ)		WE 17	24	RE
					IE 18	23	OE
			(K Type)
					NC 19	22	Vss
					Vcc 20	21	Vcc

40-PIN Plastic SOJ

Pin Name		Function
SWCK		Serial Write Clock
	SRCK	Serial Read Clock
	WE	Write Enable
	RE	Read Enable
	IE	Input Enable
	OE	Output Enable
RSTW		Write Reset Clock
	RSTR	Read Reset Clock
DIN0-11		Data Input
D	OUT	Data Output
	0-11
	Vcc	Power Supply(5V)
	Vss	Ground(0V)
	NC	No Connection

NOTE:The same power supply voltage must be provided to every Vccpin, and the same GND voltage level must be provided to every Vss pin.

3

4

	DOUT (G12)	OE	RE	RSTR	SRCK
	Data-Out	Serial	Read	Controller
	Buffer (G12)
		512 Word Serial Read Register (G12)
		Read Line Buffer		Read Line Buffer
		Low-Half (G12)		High-Half (G12)
			256 (G12)		256 (G12)

71 Word

Sub-Register (G12)

256k (G12)

-

Memory

Decoder

Array

71 Word

Sub-Register (G12)

		256 (G12)		256 (G12)
	Write Line Buffer		Write Line Buffer
	Low-Half (G12)		High-Half (G12)
	512 Word Serial Write Register (G12)
Data-In
Buffer (G12)	Serial	Write	Controller
DIN (G12)	IE	WE	RSTW	SWCK

DIAGRAM BLOCK

Semiconductor OKI

Read/Write

and Refresh

Controller

Clock

Oscillator

VBB

Generator

MSM5412222A