参数资料
型号: W9725G6IB-18
厂商: WINBOND ELECTRONICS CORP
元件分类: DRAM
英文描述: 16M X 16 DDR DRAM, 0.35 ns, PBGA84
封装: 8 X 12.50 MM, ROHS COMPLIANT, WBGA-84
文件页数: 43/69页
文件大小: 1644K
代理商: W9725G6IB-18
PRELIMINARY W9725G6IB
Publication Release Date:Nov. 14, 2008
- 48 -
Revision P04
9.13. Differential Input AC Logic Level
(0
℃ ≤ TCASE 85for -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 voltage
VIX (ac)
0.5 x VDDQ - 0.175
0.5 x VDDQ + 0.175
V
2
Note:
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.
△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 16
—AC input test signal and Differential input AC signal levels waveform
9.14. Differential AC Output Parameter
(0
℃ ≤ TCASE 85for -18/-25/-3, VDD, VDDQ = 1.8V ± 0.1V)
PARAMETER
SYM.
MIN.
MAX.
UNIT
NOTES
AC differential cross point voltage
VOX (ac)
0.5 x VDDQ - 0.125
0.5 x VDDQ + 0.125
V
1
Note:
1. 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.
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