MT41J128M16HA-125 Datasheet, PDF (57/206 Pages) Micron Technology – Differential bidirectional data strobe

2Gb: x4, x8, x16 DDR3 SDRAM
Output Driver Impedance
34 Ohm Driver
The 34Ω driver’s current range has been calculated and summarized in Table 34
(page 57) V_DD = 1.5V, Table 35 (page 57) for V_DD = 1.57V, and Table 36 (page 58) for
V_DD = 1.42V. 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 33: 34 Ohm Driver Pull-Up and Pull-Down Impedance Calculations
MR1[5,1]
0, 1
R_ON
RZQ = 240Ω r
RZQ/7 = (240Ω r
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 34: 34 Ohm Driver I_OH/I_OL Characteristics: V_DD = V_DDQ = 1.5V
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
14.7
24.6
39.3
39.3
24.6
14.7
Nom
8.8
21.9
35.0
35.0
21.9
8.8
Min
7.9
19.7
24.8
24.8
19.7
7.9
Unit
mA
mA
mA
mA
mA
mA
Table 35: 34 Ohm Driver I_OH/I_OL Characteristics: V_DD = V_DDQ = 1.575V
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
15.5
25.8
41.2
41.2
25.8
15.5
Nom
9.2
23
36.8
36.8
23
9.2
Min
8.3
20.7
26
26
20.7
8.3
Unit
mA
mA
mA
mA
mA
mA
PDF: 09005aef826aaadc
2Gb_DDR3_SDRAM.pdf – Rev. P 2/12 EN
57
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