MT41K512M4 Datasheet, PDF (60/207 Pages) Micron Technology – 8n-bit prefetch architecture

2Gb: x4, x8, x16 DDR3L SDRAM
Output Driver Impedance
DDR3L 34 Ohm Driver
Using Table 38, the 34Ω driver’s current range has been calculated and summarized in
Table 39 (page 60) V_DD = 1.35V, Table 40 for V_DD = 1.45V, and Table 41 (page 61) for
V_DD = 1.283V. The individual pull-up and pull-down resistors R_ON34(PD) and R_ON34(PU)
are defined as follows:
• R_ON34(PD) = (V_OUT)/|I_OUT|; R_ON34(PU) is turned off
• R_ON34(PU) = (V_DDQ - V_OUT)/|I_OUT|; R_ON34(PD) is turned off
Table 38: DDR3L 34 Ohm Driver Pull-Up and Pull-Down Impedance Calculations
MR1[5,1]
0, 1
R_ON
RZQ = 240Ω 
RZQ/7 = (240Ω 
R_ON
Ω
Resistor
R_ON34(PD)
R_ON34(PU)
V_OUT
0.2 × V_DDQ
0.5 × V_DDQ
0.8 × V_DDQ
0.2 × V_DDQ
0.5 × V_DDQ
0.8 × V_DDQ
Min
237.6
33.9
Min
20.4
30.5
30.5
30.5
30.5
20.4
Nom
240
34.3
Nom
34.3
34.3
34.3
34.3
34.3
34.3
Max
242.4
34.6
Max
38.1
38.1
48.5
48.5
38.1
38.1
Unit
Ω
Ω
Unit
Ω
Ω
Ω
Ω
Ω
Ω
Table 39: DDR3L 34 Ohm Driver I_OH/I_OL Characteristics: V_DD = V_DDQ = DDR3L@1.35V
MR1[5,1]
0, 1
R_ON
Ω
Resistor
R_ON34(PD)
R_ON34(PU)
V_OUT
I_OL @ 0.2 × V_DDQ
I_OL @ 0.5 × V_DDQ
I_OL @ 0.8 × V_DDQ
I_OH @ 0.2 × V_DDQ
I_OH @ 0.5 × V_DDQ
I_OH @ 0.8 × V_DDQ
Max
13.3
22.1
35.4
35.4
22.1
13.3
Nom
7.9
19.7
31.5
31.5
19.7
7.9
Min
7.1
17.7
22.3
22.3
17.7
7.1
Unit
mA
mA
mA
mA
mA
mA
Table 40: DDR3L 34 Ohm Driver I_OH/I_OL Characteristics: V_DD = V_DDQ = DDR3L@1.45V
MR1[5,1]
0, 1
R_ON
Ω
Resistor
R_ON34(PD)
R_ON34(PU)
V_OUT
I_OL @ 0.2 × V_DDQ
I_OL @ 0.5 × V_DDQ
I_OL @ 0.8 × V_DDQ
I_OH @ 0.2 × V_DDQ
I_OH @ 0.5 × V_DDQ
I_OH @ 0.8 × V_DDQ
Max
14.2
23.7
38.0
38.0
23.7
14.2
Nom
8.5
21.1
33.8
33.8
21.1
8.5
Min
7.6
19.0
23.9
23.9
19.0
7.6
Unit
mA
mA
mA
mA
mA
mA
PDF: 09005aef83ed2952
2Gb_DDR3L.pdf - Rev. L 10/14 EN
60
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