W641GG2JB Datasheet, PDF (96/109 Pages) Winbond – 1-Gbit GDDR3 Graphics SDRAM

W641GG2JB
1-Gbit GDDR3 Graphics SDRAM
7.6 Pin Capacitances
7.6.1 Pin Capacitances (VDDQ = 1.8 V, TA = 25°C, f = 1 MHz)
Parameter
Input capacitance:
A0-A11,A12, , BA0-2, CKE, CS#, CAS#, RAS#, WE#,
CKE, RES,CLK,CLK#
Input capacitance:
DQ0-DQ31, RDQS0-RDQS3, WDQS0-WDQS3, DM0-DM3
Symbol
CI,CCK
CIO
Min.
1.0
Max.
2.5
Unit Note
pF
2.0
3.0
pF
7.7 Driver current characteristics
7.7.1 Driver IV characteristics at 40 Ohms
Figure represents the driver Pull-Down and Pull-Up IV characteristics under process, voltage and temperature best and worst
case conditions. The actual Driver Pull-Down and Pull-Up current must lie between these two bounding curves. The value of the
external ZQ resistor is 240 Ω, setting the nominal driver output impedance to 40 Ω.
7.7.1.1 40 Ohm Driver Pull-Down and Pull-up Characteristics
Pull-Down Characterstics
Pull-Up Characterstics
50
0.0
0.5
1.0
1.5
2.0
45
0
40
-5
35
-10
30
-15
25
-20
20
-25
15
-30
10
-35
5
-40
0
-45
0.0
0.5
1.0
1.5
2.0
-50
V_OUT (V)
VDDQ - V_OUT (V)
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Publication Release Date: Apr, 22, 2011
Revision A01-002