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GS8662T18E-200 データシート(PDF) 11 Page - GSI Technology

部品番号 GS8662T18E-200
部品情報  72Mb SigmaCIO DDR-II Burst of 2 SRAM
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メーカー  GSI [GSI Technology]
ホームページ  http://www.gsitechnology.com
Logo GSI - GSI Technology

GS8662T18E-200 データシート(HTML) 11 Page - GSI Technology

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Preliminary
GS8662T08/09/18/36E-333/300/267*/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 VSS 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
Ω and 300Ω. 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.


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