- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385334 > GS8662D18E-250I (GSI TECHNOLOGY) 72Mb SigmaQuad-II Burst of 4 SRAM PDF資料下載
參數(shù)資料
| 型號(hào)： | GS8662D18E-250I |
| 廠商： | GSI TECHNOLOGY |
| 元件分類： | DRAM |
| 英文描述： | 72Mb SigmaQuad-II Burst of 4 SRAM |
| 中文描述： | 4M X 18 DDR SRAM, 0.45 ns, PBGA165 |
| 封裝： | 15 X 17 MM, 1 MM PITCH, FPBGA-165 |
| 文件頁(yè)數(shù)： | 13/29頁(yè) |
| 文件大小： | 896K |
| 代理商： | GS8662D18E-250I |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)當(dāng)前第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)
Preliminary
GS8662D08/09/18/36E-333/300/250/200/167
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Rev: 1.01a 2/2006
13/29
2005, GSI Technology
FLXDrive-II Output Driver Impedance Control
HSTL I/O SigmaQuad-II SRAMs are supplied with programmable impedance output drivers. The ZQ pin must be connected to
V
SS
via an external resistor, RQ, to allow the SRAM to monitor and adjust its output driver impedance. The value of RQ must be
5X the value of the desired RAM output impedance. The allowable range of RQ to guarantee impedance matching continuously is
between 150
and 300
. Periodic readjustment of the output driver impedance is necessary as the impedance is affected by drifts
in supply voltage and temperature. The SRAM’s output impedance circuitry compensates for drifts in supply voltage and
temperature. A clock cycle counter periodically triggers an impedance evaluation, resets and counts again. Each impedance
evaluation may move the output driver impedance level one step at a time towards the optimum level. The output driver is
implemented with discrete binary weighted impedance steps. Updates of pull-down drive impedance occur whenever a driver is
producing a “1” or is High-Z. Pull-up drive impedance is updated when a driver is producing a “0” or is High-Z.
Separate I/O SigmaQuad-II B4 SRAM Truth Table
Previous
Operation
A
R
W
Current
Operation
D
D
D
D
Q
Q
Q
Q
K
↑
(t
n-1
)
K
↑
(t
n
)
K
↑
(t
n
)
K
↑
(t
n
)
K
↑
(t
n
)
K
↑
(t
n+1
)
K
↑
(t
n+1
)
K
↑
(t
n+2
)
K
↑
(t
n+2
)
K
↑
(t
n+1
)
K
↑
(t
n+1
)
K
↑
(t
n+2
)
K
↑
(t
n+2
)
Deselect
X
1
1
Deselect
X
X
—
—
Hi-Z
Hi-Z
—
—
Write
X
1
X
Deselect
D2
D3
—
—
Hi-Z
Hi-Z
—
—
Read
X
X
1
Deselect
X
X
—
—
Q2
Q3
—
—
Deselect
V
1
0
Write
D0
D1
D2
D3
Hi-Z
Hi-Z
—
—
Deselect
V
0
X
Read
X
X
—
—
Q0
Q1
Q2
Q3
Read
V
X
0
Write
D0
D1
D2
D3
Q2
Q3
—
—
Write
V
0
X
Read
D2
D3
—
—
Q0
Q1
Q2
Q3
Notes:
1.
2.
3.
4.
5.
“1” = input “high”; “0” = input “l(fā)ow”; “V” = input “valid”; “X” = input “don’t care”
“—” indicates that the input requirement or output state is determined by the next operation.
Q0, Q1, Q2, and Q3 indicate the first, second, third, and fourth pieces of output data transferred during Read operations.
D0, D1, D2, and D3 indicate the first, second, third, and fourth pieces of input data transferred during Write operations.
Qs are tristated for one cycle in response to Deselect and Write commands, one cycle after the command is sampled, except when pre-
ceded by a Read command.
Users should not clock in metastable addresses.
6.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GS8662D18E-300 | 72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18E-300I | 72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18E-333 | 72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18E-333I | 72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18GE-167 | 72Mb SigmaQuad-II Burst of 4 SRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GS8662D18E-300 | 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18E-300I | 制造商:GSI Technology 功能描述:SRAM SYNC DUAL 1.8V 72MBIT 4MX18 0.45NS 165FBGA - Trays |
| GS8662D18E-333 | 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18E-333I | 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaQuad-II Burst of 4 SRAM |
| GS8662D18GE-167 | 制造商:GSI Technology 功能描述:SRAM SYNC DUAL 1.8V 72MBIT 4MX18 0.5NS 165FBGA - Trays |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。