參數(shù)資料
型號(hào): W972GG8JB-25
廠商: WINBOND ELECTRONICS CORP
元件分類: DRAM
英文描述: 256M X 8 DDR DRAM, 0.4 ns, PBGA60
封裝: 11 X 11.50 MM, ROHS COMPLIANT, WBGA-60
文件頁數(shù): 32/86頁
文件大?。?/td> 1466K
代理商: W972GG8JB-25
W972GG8JB
Publication Release Date: Feb. 18, 2011
- 38 -
Revision A02
9.4
ODT DC Electrical Characteristics
PARAMETER/CONDITION
SYM.
MIN.
NOM.
MAX.
UNIT
NOTES
Rtt effective impedance value for EMRS(A6,A2)=0,1; 75 Ω
Rtt1(eff)
60
75
90
Ω
1
Rtt effective impedance value for EMRS(A6,A2)=1,0; 150
Ω
Rtt2(eff)
120
150
180
Ω
1
Rtt effective impedance value for EMRS(A6,A2)=1,1; 50
Ω
Rtt3(eff)
40
50
60
Ω
1, 2
Deviation of VM with respect to VDDQ/2
ΔVM
-6
+6
%
1
Notes:
1. Test condition for Rtt measurements.
2. Optional for DDR2-667, mandatory for DDR2-800 and DDR2-1066.
Measurement Definition for Rtt(eff):
Apply VIH (ac) and VIL (ac) to test pin separately, then measure current I(VIH (ac)) and I(VIL (ac))
respectively. VIH (ac), VIL (ac), and VDDQ values defined in SSTL_18.
Rtt(eff) = (VIH(ac)
– VIL(ac)) /(I(VIHac) – I(VILac))
Measurement Definition for
ΔVM:
Measure voltage (VM) at test pin (midpoint) with no load.
ΔVM = ((2 x Vm / VDDQ) – 1) x 100%
9.5
Input DC Logic Level
PARAMETER
SYM.
MIN.
MAX.
UNIT
DC input logic HIGH
VIH(dc)
VREF + 0.125
VDDQ + 0.3
V
DC input logic LOW
VIL(dc)
-0.3
VREF - 0.125
V
9.6
Input AC Logic Level
PARAMETER
SYM.
-18
-25/25I/-3
UNIT
MIN.
MAX.
MIN.
MAX.
AC input logic HIGH
VIH (ac)
VREF + 0.200
VREF + 0.200
VDDQ + VPEAK
1
V
AC input logic LOW
VIL (ac)
VREF - 0.200
VSSQ - VPEAK
1
VREF - 0.200
V
Note:
1. Refer to the page 66 sections 9.14.1 and 9.14.2 AC Overshoot/Undershoot specification table for VPEAK value: maximum
peak amplitude allowed for Overshoot/Undershoot.
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