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參數資料
型號: GS8662R08E-167I
廠商: GSI TECHNOLOGY
元件分類: DRAM
英文描述: 72Mb SigmaCIO DDR-II Burst of 4 SRAM
中文描述: 8M X 8 DDR SRAM, 0.5 ns, PBGA165
封裝: 15 MM X 17 MM, 1MM PITCH, FPBGA-165
文件頁數: 11/37頁
文件大小: 942K
代理商: GS8662R08E-167I
Preliminary
GS8662R08/09/18/36E-333/300/250/200/167
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Rev: 1.01 9/2005
11/37
2005, GSI Technology
FLXDrive-II Output Driver Impedance Control
HSTL I/O SigmaCIO DDR-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.
Common I/O SigmaCIO DDR-II B4 SRAM Truth Table
K
n
LD
R/W
DQ
Operation
A + 0
A + 1
A + 2
A + 3
1
X
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Deselect
0
0
D@K
n+1
D@K
n+1
D@K
n+2
D@K
n+2
Write
0
1
Q@K
n+1
or
C
n+1
Q@K
n+2
or
C
n+2
Q@K
n+2
or
C
n+2
Q@K
n+3
or
C
n+3
Read
Note:
Q is controlled by K clocks if C clocks are not used.
相關PDF資料
PDF描述
GS8662R08E-200 72Mb SigmaCIO DDR-II Burst of 4 SRAM
GS8662R08E-200I 72Mb SigmaCIO DDR-II Burst of 4 SRAM
GS8662R08E-250 72Mb SigmaCIO DDR-II Burst of 4 SRAM
GS8662R08E-250I 72Mb SigmaCIO DDR-II Burst of 4 SRAM
GS8662R08E-300 72Mb SigmaCIO DDR-II Burst of 4 SRAM
相關代理商/技術參數
參數描述
GS8662R08E-200 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaCIO DDR-II Burst of 4 SRAM
GS8662R08E-200I 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaCIO DDR-II Burst of 4 SRAM
GS8662R08E-250 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaCIO DDR-II Burst of 4 SRAM
GS8662R08E-250I 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaCIO DDR-II Burst of 4 SRAM
GS8662R08E-300 制造商:GSI 制造商全稱:GSI Technology 功能描述:72Mb SigmaCIO DDR-II Burst of 4 SRAM
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