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| MT41J256M8 Datasheet, PDF (64/211 Pages) Micron Technology – MT41J512M4 – 64 Meg x 4 x 8 Banks | |||
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2Gb: x4, x8, x16 DDR3 SDRAM
Output Driver Impedance
Alternative 40 Ohm Driver
Table 44: 40 Ohm Driver Impedance Characteristics
MR1[5,1]
RON
0,0
Ω
Resistor
RON40(PD)
RON40(PU)
Pull-up/pull-down mismatch (MMPUPD)
VOUT
0.2 Ã VDDQ
0.5 Ã VDDQ
0.8 Ã VDDQ
0.2 Ã VDDQ
0.5 Ã VDDQ
0.8 Ã VDDQ
0.5 Ã VDDQ
Min
0.6
0.9
0.9
0.9
0.9
0.6
â10%
Nom
1.0
1.0
1.0
1.0
1.0
1.0
n/a
Max
1.1
1.1
1.4
1.4
1.1
1.1
10
Unit
RZQ/6
RZQ/6
RZQ/6
RZQ/6
RZQ/6
RZQ/6
%
Notes:
1. Tolerance limits assume RZQ of 240Ω ±1% and are applicable after proper ZQ calibra-
tion has been performed at a stable temperature and voltage (VDDQ = VDD; VSSQ = VSS).
Refer to 40 Ohm Output Driver Sensitivity (page 64) if either the temperature or the
voltage changes after calibration.
2. Measurement definition for mismatch between pull-up and pull-down (MMPUPD). Meas-
ure both RON(PU) and RON(PD) at 0.5 Ã VDDQ:
MMPUPD =
RON(PU) - RON(PD)
RON,nom
à 100
3. For IT and AT (1Gb only) devices, the minimum values are derated by 6% when the de-
vice operates between â40°C and 0°C (TC).
40 Ohm Output Driver Sensitivity
If either the temperature or the voltage changes after I/O calibration, then the tolerance
limits listed in Table 44 can be expected to widen according to Table 45 and Table 46
(page 65).
Table 45: 40 Ohm Output Driver Sensitivity Definition
Symbol
Min
RON(PD) @ 0.2 Ã VDDQ
RON(PD) @ 0.5 Ã VDDQ
RON(PD) @ 0.8 Ã VDDQ
RON(PU) @ 0.2 Ã VDDQ
RON(PU) @ 0.5 Ã VDDQ
RON(PU) @ 0.8 Ã VDDQ
0.6 - dRONdTL Ã |ÎT| - dRONdVL Ã |ÎV|
0.9 - dRONdTM Ã |ÎT| - dRONdVM Ã |ÎV|
0.9 - dRONdTH Ã |ÎT| - dRONdVH Ã |ÎV|
0.9 - dRONdTL Ã |ÎT| - dRONdVL Ã |ÎV|
0.9 - dRONdTM Ã |ÎT| - dRONdVM Ã |ÎV|
0.6 - dRONdTH Ã |ÎT| - dRONdVH Ã |ÎV|
Max
1.1 + dRONdTL Ã |ÎT| + dRONdVL Ã |ÎV|
1.1 + dRONdTM Ã |ÎT| + dRONdVM Ã |ÎV|
1.4 + dRONdTH Ã |ÎT| + dRONdVH Ã |ÎV|
1.4 + dRONdTL Ã |ÎT| + dRONdVL Ã |ÎV|
1.1 + dRONdTM Ã |ÎT| + dRONdVM Ã |ÎV|
1.1 + dRONdTH Ã |ÎT| + dRONdVH Ã |ÎV|
Note: 1. ÎT = T - T(@CALIBRATION)ÎV = VDDQ - VDDQ(@CALIBRATION); and VDD = VDDQ.
Unit
RZQ/6
RZQ/6
RZQ/6
RZQ/6
RZQ/6
RZQ/6
PDF: 09005aef826aaadc
2Gb_DDR3_SDRAM.pdf - Rev. Q 04/13 EN
64
Micron Technology, Inc. reserves the right to change products or specifications without notice.
 2006 Micron Technology, Inc. All rights reserved.
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