參數(shù)資料
型號(hào)： μPD4265805
廠商： NEC Corp.
英文描述： 8,388,608 Words by 8 Bits CMOS dynamic RAMs(64M 動(dòng)態(tài)RAM)
中文描述： 8388608字8位的CMOS（6400動(dòng)態(tài)RAM動(dòng)態(tài)存儲(chǔ)器）
文件頁(yè)數(shù)： 5/36頁(yè)
文件大?。?/td> 226K
代理商： ΜPD4265805
μ
PD4264805, 42S65805, 4265805
5
Input/Output Pin Functions
The
μ
PD4264805, 42S65805, 4265805 have input pins RAS, CAS, WE, OE, Address
Note
and input/output
pins I/O1 to I/O8.
Pin name
RAS
(Row address strobe)
CAS
(Column address strobe)
A0 to A
×
Note
(Address inputs)
WE
(Write enable)
OE
(Output enable)
I/O1 to I/O8
(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 self refresh, 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 23-bit of address signal, upper bits and lower bits
Note
in sequence
(address multiplex method).
Therefore, one word is selected from 8,388,608-word by 8-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
8-bit data bus.
I/O1 to I/O8 are used to input/output data.
Note
Part number
Address inputs
Upper bits
Lower bits
μ
PD4264805
A0 - A12
13
10
μ
PD42S65805, 4265805
A0 - A11
12
12
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