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參數(shù)資料
| 型號(hào)： | MB81V4400C-70 |
| 廠商： | Fujitsu Limited |
| 英文描述： | CMOS 1M x 4 Bit Fast Page Mode Dynamic RAM(CMOS 1M x 4位快速頁模式動(dòng)態(tài)RAM) |
| 中文描述： | 100萬的CMOS × 4位快速頁面模式動(dòng)態(tài)RAM的CMOS（100萬× 4位快速頁模式動(dòng)態(tài)內(nèi)存） |
| 文件頁數(shù)： | 22/26頁 |
| 文件大?。?/td> | 302K |
| 代理商： | MB81V4400C-70 |
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22
MB81V4400C-60/MB81V4400C-70
HIGH-Z
HIGH-Z
HIGH-Z
VALID DATA IN
COLUMN ADDRESS
Fig. 17 – CAS-BEFORE-RAS REFRESH COUNTER TEST CYCLE
Parameter
Unit
Min.
Max.
ns
No.
Min.
Max.
—
—
40
35
(At recommended operating conditions unless otherwise noted.)
MB81V4400C-60
Symbol
30
—
—
ns
30
92
93
94
60
—
—
ns
55
40
—
—
ns
35
40
—
—
ns
35
MB81V4400C-70
Access Time from CAS
Column Address Hold Time
CAS to WE Delay Time
CAS Pulse width
RAS Hold Time
Note. Assumes that CAS-before-RAS refresh counter test cycle only.
91
90
t
FCAC
t
FCAH
t
FCWD
t
FCAS
t
FRSH
“H” or “L”
Valid Data
RAS
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
V
OH
V
OL
CAS
WE
DQ
(Output)
A
0
to A
9
DQ
(Input)
V
IH
V
IL
OE
V
IH
V
IL
DDESCRIPTION
A special timing sequence using the CAS-before-RAS refresh counter test cycle provides a convenient method to verify the
functionality of CAS-before-RAS refresh circuitry. If, after a CAS-before-RAS refresh cycle. CAS makes a transition from High to
Low while RAS is held Low, read and write operations are enabled as shown above. Row and column addresses are defined as
follows:
Row Address: Bits A
0
through A
9
are defined by the on-chip refresh counter.
Column Address: Bits A
0
through A
9
are defined by latching levels on A
0
-A
9
at the second falling edge of CAS.
The CAS-before-RAS Counter Test procedure is as follows ;
1) Initialize the internal refresh address counter by using 8 RAS-only refresh cycles.
2) Use the same column address throughout the test.
3) Write “0” to all 1024 row addresses at the same column address by using normal write cycles.
4) Read “0” written in procedure 3) and check; simultaneously write “1” to the same addresses by using CAS-before-RAS
refresh counter test (read-modify-write cycles). Repeat this procedure 1024 times with addresses generated by the
internal refresh address counter.
5) Read and check data written in procedure 4) by using normal read cycle for all 1024 memory locations.
6) Reverse test data and repeat procedures 3), 4), and 5).
t
CHR
t
CSR
t
CP
t
FRSH
t
FCAS
t
RP
t
RAL
t
FCAH
t
ASC
t
WHR
t
RCS
t
FCAC
t
ON
t
DZC
t
OEH
t
FCWD
t
CWL
t
RWL
t
WP
t
DS
t
DH
t
OED
t
OEZ
t
OEA
t
DZO
t
WSR
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