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W641GG2JB Datasheet, PDF (41/109 Pages) Winbond – 1-Gbit GDDR3 Graphics SDRAM
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W641GG2JB
1-Gbit GDDR3 Graphics SDRAM
6.5.4 Output impedance and Termination DC Electrical Characteristics
The Driver and Termination impedances are determined by applying VDDQ/2 nominal at the corresponding input/output and by
measuring the current flowing into or out of the device. VDDQ is set to the nominal value.
IOH is the current flowing out of DQ when the Pull-Up transistor is activated and the DQ termination disabled. IOL is the current
flowing into DQ when the Pull-Down transistor is activated and the DQ termination disabled. ITCAH(ZQ) is the current flowing out of the
Termination of Commands and Addresses for a ZQ termination value.
6.5.4.1 DC Electrical Characteristic
Limit Values
Parameter
ZQ Value
240
Unit
Min.
Max.
IOH
IOL
ITCAH(ZQ)
ZQ/6
ZQ/6
ZQ
20.5
25.0
mA
20.5
25.0
mA
3.4
4.2
mA
Notes :
1. Measurement performed with VDDQ (nominal) and by applying VDDQ/2 at the corresponding Input / Output. 0° C ≤ Tc ≤105° C
2. for 1.8 V VDD/VDDQ power supply
Note
1,2
1,2
1,2
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Publication Release Date: Apr, 22, 2011
Revision A01-002
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