1Gb: x4, x8, x16 DDR3 SDRAM
Output Driver Impedance
34 Ohm Driver
The 34Ω driver’s current range has been calculated and summarized in Table 39
(page 65) VDD = 1.5V, Table 4± (page 65) for VDD = 1.50V, and Table 41 (page 66) for
VDD = 1.42V. The individual pull-up and pull-down resistors RON34(PD) and RON34(PU) are
defined as follows:
• RON34(PD) = (VOUT)/|IOUT|; RON34(PU) is turned off
• RON34(PU) = (VDDQ - VOUT)/|IOUT|; RON34(PD) is turned off
Table 38: 34 Ohm Driver Pull-Up and Pull-Down Impedance Calculations
RON
Min
237.6
33.9
Min
20.4
30.5
30.5
30.5
30.5
20.4
Nom
240
Max
242.4
34.6
Max
38.1
38.1
48.5
48.5
38.1
38.1
Unit
Ω
RZQ = 240Ω rꢂꢉ
RZQ/7 = (240Ω rꢂꢉꢀꢌꢍ
34.3
Nom
34.3
34.3
34.3
34.3
34.3
34.3
Ω
MR1[5,1]
RON
ꢇꢆꢁꢇΩ
Resistor
VOUT
Unit
Ω
0, 1
RON34(PD)
0.2 × VDDQ
0.5 × VDDQ
0.8 × VDDQ
0.2 × VDDQ
0.5 × VDDQ
0.8 × VDDQ
Ω
Ω
RON34(PU)
Ω
Ω
Ω
Table 39: 34 Ohm Driver IOH/IOL Characteristics: VDD = VDDQ = 1.5V
MR1[5,1]
RON
Resistor
VOUT
Max
14.7
24.6
39.3
39.3
24.6
14.7
Nom
8.8
Min
7.9
Unit
mA
mA
mA
mA
mA
mA
0, 1
ꢇꢆꢁꢇΩ
RON34(PD)
IOL @ 0.2 × VDDQ
IOL @ 0.5 × VDDQ
IOL @ 0.8 × VDDQ
IOH @ 0.2 × VDDQ
IOH @ 0.5 × VDDQ
IOH @ 0.8 × VDDQ
21.9
35.0
35.0
21.9
8.8
19.7
24.8
24.8
19.7
7.9
RON34(PU)
Table 40: 34 Ohm Driver IOH/IOL Characteristics: VDD = VDDQ = 1.575V
MR1[5,1]
RON
Resistor
VOUT
Max
15.5
25.8
41.2
41.2
25.8
15.5
Nom
9.2
Min
8.3
Unit
mA
mA
mA
mA
mA
mA
0, 1
ꢇꢆꢁꢇΩ
RON34(PD)
IOL @ 0.2 × VDDQ
IOL @ 0.5 × VDDQ
IOL @ 0.8 × VDDQ
IOH @ 0.2 × VDDQ
IOH @ 0.5 × VDDQ
IOH @ 0.8 × VDDQ
23
20.7
26
36.8
36.8
23
RON34(PU)
26
20.7
8.3
9.2
PDF: 09005aef826aa906
1Gb_DDR3_SDRAM.pdf - Rev. L 03/13 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
65
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