參數(shù)資料
型號： W971GG6IB-25
廠商： WINBOND ELECTRONICS CORP
元件分類： DRAM
英文描述： 32M X 16 DDR DRAM, 0.4 ns, PBGA84
封裝： 8 X 12.50 MM, ROHS COMPLIANT, WBGA-84
文件頁數(shù)： 62/86頁
文件大小： 1360K
代理商： W971GG6IB-25
W971GG6IB
Publication Release Date: Oct. 23, 2009
- 65 -
Revision A02
9.12 AC Input Test Conditions
(0℃ ≤ TCASE ≤ 85℃ for -18/-25/-3, VDD, VDDQ = 1.8V ± 0.1V)
CONDITION
SYMBOL
VALUE
UNIT
NOTES
Input reference voltage
VREF
0.5 x VDDQ
V
1
Input signal maximum peak to peak swing
VSWING(MAX)
1.0
V
1
Input signal minimum slew rate
SLEW
1.0
V/nS
2, 3
Notes:
1. Input waveform timing is referenced to the input signal crossing through the VIH/IL(ac) level applied to the device under test.
2. The input signal minimum slew rate is to be maintained over the range from VREF to VIH(ac) min for rising edges and the
range from VREF to VIL(ac) max for falling edges as shown in the below figure.
3. AC timings are referenced with input waveforms switching from VIL(ac) to VIH(ac) on the positive transitions and VIH(ac) to
VIL(ac) on the negative transitions.
9.13 Differential Input/Output AC Logic Levels
(0℃ ≤ TCASE ≤ 85℃ for -18/-25/-3, VDD, VDDQ = 1.8V ± 0.1V)
PARAMETER
SYM.
MIN.
MAX.
UNIT
NOTES
AC differential input voltage
VID (ac)
0.5
VDDQ + 0.6
V
1
AC differential cross point input voltage
VIX (ac)
0.5 x VDDQ - 0.175
0.5 x VDDQ + 0.175
V
2
AC differential cross point output voltage
VOX (ac)
0.5 x VDDQ - 0.125
0.5 x VDDQ + 0.125
V
3
Notes:
1. VID (ac) specifies the input differential voltage |VTR -VCP | required for switching, where VTR is the true input signal (such
as CLK, LDQS or UDQS) and VCP is the complementary input signal (such as CLK , LDQS or UDQS ). The minimum
value is equal to VIH (ac) - VIL (ac).
2. The typical value of VIX (ac) is expected to be about 0.5 x VDDQ of the transmitting device and VIX (ac) is expected to track
variations in VDDQ. VIX (ac) indicates the voltage at which differential input signals must cross.
3. The typical value of VOX (ac) is expected to be about 0.5 x VDDQ of the transmitting device and VOX (ac) is expected to
track variations in VDDQ. VOX (ac) indicates the voltage at which differential output signals must cross.
△
TF
△
TR
VDDQ
VIH(ac) min
Falling Slew =
Rising Slew =
VIH(dc) min
VREF
VIL(dc) max
VIL(ac) max
VSS
VSWING(MAX)
VREF - VIL(ac) max
△
TF
VIH(ac) min - VREF
△
TR
VDDQ
VSSQ
VIX or VOX
VID
VTR
Crossing point
VCP
Figure 28—AC input test signal and Differential signal levels waveform
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參數(shù)描述
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