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參數(shù)資料
| 型號： | K4B1G0846C-CF8 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | 1Gb C-die DDR3 SDRAM Specification |
| 中文描述： | 1Gb的?芯片的DDR3 SDRAM規(guī)范 |
| 文件頁數(shù)： | 24/63頁 |
| 文件大?。?/td> | 1255K |
| 代理商： | K4B1G0846C-CF8 |
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Page 24 of 63
Rev. 1.0 June 2007
1Gb DDR3 SDRAM
K4B1G04(08/16)46C
A functional representation of the output buffer is shown below. Output driver impedance RON is defined by the value of external reference resistor RZQ
as follows:
RON
34
= RZQ/7 (Nominal 34ohms +/- 10% with nominal RZQ=240ohm)
The individual Pull-up and Pull-down resistors (RONpu and RONpd) are defined as follows
VDDQ-Vout
under the condition that RONpd is turned off
Output Driver : Definition of Voltages and Currents
RONpu =
l Iout l
RONpd =
Vout
l Iout l
under the condition that RONpu is turned off
VDDQ
DQ
VSSQ
RON
Pu
Ipd
RON
Pd
To
other
circuity
Output Driver
Ipu
Iout
Vout
9.7 34 ohm Output Driver DC Electrical Characteristics
Figure 12. Output Driver : Definition of Voltages and Currents
[ Table 22 ] Output Driver DC Electrical Characteristics, assuming RZQ=240 ohms ;
entire operating temperature range; after proper ZQ calibration
Note :
1. The tolerance limits are specified after calibration with stable voltage and temperature. For the behavior of the tolerance limits if temperature or voltage changes after calibra-
tion, see following section on voltage and temperature sensitivity
2. The tolerance limits are specified under the condition that VDDQ = VDD and that VSSQ = VSS
3. Pull-down and pull-up output driver impedance are recommended to be calibrated at 0.5 X VDDQ. Other calibration schemes may be used to achieve the linearity spec
shown above, e.g. calibration at 0.2 X VDDQ and 0.8 X VDDQ
4. Measurement definition for mismatch between pull-up and pull-down, MMpupd: Measure RONpu and RONpd. both at 0.5 X VDDQ:
RONpu - RONpd
MMpupd = x 100
RONnom
RONnom
Resistor
Vout
Min
Nom
Max
Units
Notes
34Ohms
RON34pd
VOLdc = 0.2 x VDDQ
0.6
1.0
1.1
RZQ/7
1,2,3
VOMdc = 0.5 x VDDQ
0.9
1.0
1.1
RZQ/7
1,2,3
VOHdc = 0.8 x VDDQ
0.9
1.0
1.4
RZQ/7
1,2,3
RON34pu
VOLdc = 0.2 x VDDQ
0.9
1.0
1.4
RZQ/7
1,2,3
VOMdc = 0.5 x VDDQ
0.9
1.0
1.1
RZQ/7
1,2,3
VOHdc = 0.8 x VDDQ
0.6
1.0
1.1
RZQ/7
1,2,3
Mismatch between Pull-up and Pull-down,
MMpupd
VOMdc = 0.5 x VDDQ
-10
10
%
1,2,4
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