參數(shù)資料
型號: μPD4217405
廠商: NEC Corp.
英文描述: 16 M-Bit Dynamic RAM(16M 動態(tài)RAM)
中文描述: 16 m位動態(tài)隨機存儲器(RAM的1,600動態(tài))
文件頁數(shù): 5/40頁
文件大?。?/td> 319K
代理商: ΜPD4217405
μ
PD42S17405, 4217405
5
Input/Output Pin Functions
The
μ
PD42S17405, 4217405 have input pins RAS, CAS, WE, OE, A0 to A10 and input/output pins I/O1 to I/O4.
Pin name
RAS
(Row address strobe)
CAS
(Column address strobe)
A0 to A10
(Address inputs)
WE
(Write enable)
OE
(Output enable)
I/O1 to I/O4
(Data inputs/outputs)
Input/Output
Function
Input
RAS activates the sense amplifier by latching a row address and selecting a
corresponding word line.
It refreshes memory cell array of one line selected by the row address.
It also selects the following function.
CAS before RAS refresh
Input
CAS activates data input/output circuit by latching column address and
selecting a digit line connected with the sense amplifier.
Input
Address bus.
Input total 22-bit of address signal, upper 11-bit and lower 11-bit in sequence
(address multiplex method).
Therefore, one word is selected from 4,194,304-word by 4-bit memory cell
array.
In actual operation, latch row address by specifying row address and
activating RAS.
Then, switch the address bus to column address and activate CAS.
Each address is taken into the device when RAS and CAS are activated.
Therefore, the address input setup time (t
ASR
, t
ASC
) and hold time (t
RAH
, t
CAH
)
are specified for the activation of RAS and CAS.
Input
Write control signal.
Write operation is executed by activating RAS, CAS and WE.
Input
Read control signal.
Read operation can be executed by activating RAS, CAS and OE.
If WE is activated during read operation, OE is to be ineffective in the device.
Therefore, read operation cannot be executed.
Input/Output
4-bit data bus.
I/O1 to I/O4 are used to input/output data.
相關(guān)PDF資料
PDF描述
μPD42S17405 16 M-Bit Dynamic RAM(16M 動態(tài)RAM)
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μPD42S17805L 3.3V OPERATION 16 M-BIT DYNAMIC RAM 2M-WORD BY 8-BIT,EDO
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